10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended

June 30, 2019

or

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from ________ to ________

Commission File Number 000-30205

CABOT MICROELECTRONICS CORPORATION

(Exact name of registrant as specified in its charter)

Delaware	36-4324765
(State of Incorporation)	(I.R.S. Employer Identification No.)

870 North Commons Drive		60504
Aurora	Illinois	(Zip Code)
(Address of principal executive offices)

Registrant's telephone number, including area code: (630) 375-6631

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.001 per share	CCMP	NASDAQ

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes ☒ No

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (Section 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

Yes ☒ No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company.  See definitions of “large accelerated filer,” “accelerated filer,” smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer ☒ Accelerated filer ☐ Non-accelerated filer   ☐ Smaller reporting company ☐ Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act          ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes ☐ No ☒

As of July 31, 2019, the Company had 29,036,385 shares of Common Stock, par value $0.001 per share, outstanding.

CABOT MICROELECTRONICS CORPORATION

INDEX

Part I. Financial Information		Page
Item 1.	Unaudited Financial Statements
	Consolidated Statements of Income	3
	Consolidated Statements of Comprehensive Income	4
	Consolidated Balance Sheets	5
	Consolidated Statements of Cash Flows	6
	Consolidated Statements of Changes in Stockholders’ Equity	7
	Notes to the Consolidated Financial Statements	9
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	30
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	54
Item 4.	Controls and Procedures	55
Part II. Other Information
Item 1.	Legal Proceedings	56
Item 1A.	Risk Factors	56
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	65
Item 3.	Defaults Upon Senior Securities	65
Item 4.	Mine Safety Disclosures	65
Item 6.	Exhibits	66
	Signatures	67

2

INDEX

PART I. FINANCIAL INFORMATION

ITEM 1.

CABOT MICROELECTRONICS CORPORATION

CONSOLIDATED STATEMENTS OF INCOME

(Unaudited and in thousands, except per share amounts)

	Three Months Ended June 30,					Nine Months Ended June 30,
	2019			2018		2019			2018
Revenue	$	271,882		$	150,437	$	759,051		$	433,394
Cost of sales	156,492			69,737		429,508			203,635
Gross profit	115,390			80,700		329,543			229,759
Operating expenses:
Research, development and technical	12,191			13,059		39,009			38,578
Selling, general and administrative	50,959			25,711		162,415			75,051
Total operating expenses	63,150			38,770		201,424			113,629
Operating income	52,240			41,930		128,119			116,130
Interest expense	12,757			513		32,978			2,803
Interest income	417			1,141		2,004			3,248
Other income (expense), net	(472		)	486		(2,897		)	113
Income before income taxes	39,428			43,044		94,248			116,688
Provision for income taxes	20,550			7,873		34,790			54,863
Net income	$	18,878		$	35,171	$	59,458		$	61,825
Basic earnings per share (in dollars per share)	$	0.65		$	1.37	$	2.09		$	2.42
Weighted average basic shares outstanding	29,064			25,612		28,399			25,479
Diluted earnings per share (in dollars per share)	$	0.64		$	1.34	$	2.06		$	2.35
Weighted average diluted shares outstanding	29,568			26,319		28,924			26,222

The accompanying notes are an integral part of these Consolidated Financial Statements.

3

CABOT MICROELECTRONICS CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited and in thousands)

	Three Months Ended June 30,						Nine Months Ended June 30,
	2019			2018			2019			2018
Net income	$	18,878		$	35,171		$	59,458		$	61,825
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	2,699			(8,829		)	4,132			2,276
Net unrealized loss on available-for-sale securities	—			(48		)	—			(48		)
Net unrealized loss on cash flow hedges	(9,044		)	(210		)	(15,518		)	(63		)
Other comprehensive income (loss), net of tax	(6,345		)	(9,087		)	(11,386		)	2,165
Comprehensive income	$	12,533		$	26,084		$	48,072		$	63,990

The accompanying notes are an integral part of these Consolidated Financial Statements.

4

CABOT MICROELECTRONICS CORPORATION

CONSOLIDATED BALANCE SHEETS

(Unaudited and in thousands, except share amounts)

	June 30, 2019			September 30, 2018
ASSETS
Current assets:
Cash and cash equivalents	$	168,678		$	352,921
Accounts receivable, less allowance for doubtful accounts of $1,923 at June 30, 2019, and $1,900 at September 30, 2018	135,235			75,886
Inventories	145,783			71,926
Prepaid expenses and other current assets	25,296			22,048
Total current assets	474,992			522,781
Property, plant and equipment, net	266,391			111,403
Goodwill	708,390			101,083
Other intangible assets, net	838,034			35,202
Deferred income taxes	5,612			5,840
Other long-term assets	5,658			4,664
Total assets	$	2,299,077		$	780,973
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	46,758		$	18,171
Current portion of long-term debt	13,313			—
Accrued expenses, income taxes payable and other current liabilities	95,261			82,983
Total current liabilities	155,332			101,154
Long-term debt, net of current portion, less prepaid debt issuance costs of $18,655 at June 30, 2019	930,370			—
Deferred income taxes	144,704			81
Other long-term liabilities	43,338			13,046
Total liabilities	1,273,744			114,281
Commitments and contingencies (Note 12)
Stockholders’ equity:
Common Stock: Authorized: 200,000,000 shares, $0.001 par value; Issued: 39,470,364 shares at June 30, 2019, and 35,862,465 shares at September 30, 2018	39			36
Capital in excess of par value of common stock	979,940			622,498
Retained earnings	494,009			471,673
Accumulated other comprehensive income (loss)	(6,847		)	4,539
Treasury stock at cost, 10,447,011 shares at June 30, 2019, and 10,356,147 shares at September 30, 2018	(441,808		)	(432,054		)
Total stockholders’ equity	1,025,333			666,692
Total liabilities and stockholders’ equity	$	2,299,077		$	780,973

The accompanying notes are an integral part of these Consolidated Financial Statements.

5

CABOT MICROELECTRONICS CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited and amounts in thousands)

	Nine Months Ended June 30,
	2019			2018
Cash flows from operating activities:
Net income	$	59,458		$	61,825
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	70,476			19,527
Provision for doubtful accounts	(75		)	80
Share-based compensation expense	15,048			14,269
Deemed repatriation transition tax	—			24,641
Deferred income tax (expense) benefit	(16,760		)	9,280
Non-cash foreign exchange (gain) loss	907			(1,340		)
(Gain) loss on disposal of property, plant and equipment	(59		)	45
Realized loss on the sale of available-for-sale securities	—			117
Non-cash charge on inventory step up of acquired inventory sold	14,869			—
Amortization of debt issuance costs	2,086			441
(Gain) on sale of assets	—			(956		)
Other	2,201			3,589
Changes in operating assets and liabilities:
Accounts receivable	6,187			(9,612		)
Inventories	(19,477		)	(5,526		)
Prepaid expenses and other assets	10,831			(12,482		)
Accounts payable	(1,558		)	473
Accrued expenses, income taxes payable and other liabilities	(27,089		)	(375		)
Net cash provided by operating activities	117,045			103,996
Cash flows from investing activities:
Additions to property, plant and equipment	(32,691		)	(15,245		)
Acquisition of a business, net of cash acquired	(1,182,186		)	—
Cash settlement of life insurance policy	3,959			—
Proceeds from the sale of assets	1,210			3,027
Purchases of available-for-sale securities	—			(178,412		)
Proceeds from the sale and maturities of available-for-sale securities	—			55,194
Settlement of net investment hedge	—			(9,882		)
Net cash used in investing activities	(1,209,708		)	(145,318		)
Cash flows from financing activities:
Repayment of long-term debt	(102,663		)	(144,375		)
Repurchases of common stock	(9,468		)	(33,072		)
Proceeds from issuance of long-term debt	1,062,337			—
Debt issuance costs	(18,745		)	—
Proceeds from issuance of stock	11,349			20,297
Dividends paid	(34,132		)	(20,507		)
Net cash provided by (used in) financing activities	908,678			(177,657		)
Effect of exchange rate changes on cash	(258		)	7,213
Decrease in cash and cash equivalents	(184,243		)	(211,766		)
Cash and cash equivalents at beginning of period	352,921			397,890
Cash and cash equivalents at end of period	$	168,678		$	186,124
Supplemental disclosure of non-cash investing and financing activities:
Purchases of property, plant and equipment in accrued liabilities and accounts payable at the end of the period	$	3,085		$	1,588
Equity consideration related to the acquisition of KMG Chemicals, Inc	331,048			—

The accompanying notes are an integral part of these Consolidated Financial Statements.

6

CABOT MICROELECTRONICS CORPORATION

CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY

(Unaudited and amounts in thousands)

	Common Stock		Capital In Excess Of Par		Retained Earnings			Accumulated Other Comprehensive Income			Treasury Stock			Total
Balance at September 30, 2018	$	36	$	622,498	$	471,673		$	4,539		$	(432,054	)	$	666,692
Share-based compensation expense			8,170											8,170
Repurchases of common stock - other, at cost											(4,001		)	(4,001		)
Exercise of stock options			3,097											3,097
Issuance of common stock in connection with acquisition of KMG Chemicals, Inc.	3		331,045											331,048
Issuance of Cabot Microelectronics restricted stock under Deposit Share Program			75											75
Net income					13,443									13,443
Dividends ($0.40 per share in dollars)					(11,598		)							(11,598		)
Effect of the adoption of the revenue recognition accounting standards					(933		)							(933		)
Foreign currency translation adjustment								2,425						2,425
Minimum pension liability adjustment								(251		)				(251		)
Balance at December 31, 2018	39		964,885		472,585			6,713			(436,055		)	1,008,167
Share-based compensation expense			3,538											3,538
Repurchases of common stock - other, at cost											(694		)	(694		)
Exercise of stock options			5,080											5,080
Issuance of Cabot Microelectronics stock under Employee Stock Purchase Plan			2,109											2,109
Net income					27,137									27,137
Dividends ($0.42 per share in dollars)					(12,255		)							(12,255		)
Foreign currency translation adjustment								(992		)				(992		)
Interest rate swap								(6,474		)				(6,474		)
Minimum pension liability adjustment								251						251
Balance at March 31, 2019	39		975,612		487,467			(502		)	(436,749		)	1,025,867
Share-based compensation expense			3,340											3,340
Repurchases of common stock under share repurchase plans, at cost											(5,001		)	(5,001		)
Repurchases of common stock - other, at cost											(58		)	(58		)
Exercise of stock options			988											988
Net income					18,878									18,878
Dividends					(12,336		)							(12,336		)
Foreign currency translation adjustment								2,699						2,699
Interest rate swap								(9,044		)				(9,044		)
Balance at June 30, 2019	$	39	$	979,940	$	494,009		$	(6,847	)	$	(441,808	)	$	1,025,333

The accompanying notes are an integral part of these Consolidated Financial Statements.

7

CABOT MICROELECTRONICS CORPORATION

CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY

(Unaudited and amounts in thousands)

	Common Stock		Capital In Excess Of Par		Retained Earnings			Accumulated Other Comprehensive Income			Treasury Stock			Total
Balance at September 30, 2017	$	35	$	580,938	$	397,881		$	3,949		$	(387,766	)	$	595,037
Share-based compensation expense			5,881											5,881
Repurchases of common stock under share repurchase plans, at cost											(1,591		)	(1,591		)
Repurchases of common stock - other, at cost											(3,160		)	(3,160		)
Exercise of stock options			6,139											6,139
Issuance of Cabot Microelectronics restricted stock under Deposit Share Program			300											300
Net loss					(3,083		)							(3,083		)
Dividends ($0.20 per share in dollars)					(5,153		)							(5,153		)
Foreign currency translation adjustment								7,144						7,144
Interest rate swaps								199						199
Unrealized loss in short term available-for-sale securities								(46		)				(46		)
Balance at December 31, 2017	35		593,258		389,645			11,246			(392,517		)	601,667
Share-based compensation expense			4,223											4,223
Repurchases of common stock under share repurchase plans, at cost											(5,005		)	(5,005		)
Repurchases of common stock - other, at cost											(300		)	(300		)
Exercise of stock options	1		9,611											9,612
Issuance of Cabot Microelectronics stock under Employee Stock Purchase Plan			2,012											2,012
Net income					29,737									29,737
Dividends ($0.40 per share in dollars)					(10,390		)							(10,390		)
Foreign currency translation adjustment								3,961						3,961
Interest rate swaps								(52		)				(52		)
Sale of short term available-for-sale securities								46						46
Balance at March 31, 2018	36		609,104		408,992			15,201			(397,822		)	635,511
Share-based compensation expense			4,236											4,236
Repurchases of common stock under share repurchase plans, at cost											(23,508		)	(23,508		)
Exercise of stock options			2,203											2,203
Net income					35,171									35,171
Dividends					(10,345		)							(10,345		)
Foreign currency translation adjustment								(8,829		)				(8,829		)
Interest rate swaps								(210		)				(210		)
Change in unrealized gain/(loss) in short term available-for-sale securities								(48		)				(48		)
Balance at June 30, 2018	$	36	$	615,543	$	433,818		$	6,114		$	(421,330	)	$	634,181

The accompanying notes are an integral part of these Consolidated Financial Statements.

8

CABOT MICROELECTRONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited and in thousands, except share and per share amounts)

1. BACKGROUND AND BASIS OF PRESENTATION

Cabot Microelectronics Corporation (“Cabot Microelectronics”, “the Company”, “us”, “we”, or “our”') is a leading global supplier of consumable materials to semiconductor manufacturers and pipeline operators.  On November 15, 2018 (“Acquisition Date”), we completed our acquisition of KMG Chemicals, Inc. (“KMG”), which produces and distributes specialty chemicals and performance materials for the semiconductor, pipeline operations, energy industries and industrial wood preservation industries (“Acquisition”).  The Acquisition has extended and strengthened our position as one of the leading suppliers of consumable materials to the semiconductor industry and expands our portfolio with the addition of KMG’s businesses, which we believe enables us to be a leading global provider of performance products and services to the pipeline companies and energy industries. The Consolidated Financial Statements included in this Report on Form 10-Q include the financial results of KMG from the Acquisition Date. Subsequent to the Acquisition, we have operated our business within two reportable segments: Electronic Materials and Performance Materials. The Electronic Materials segment consists of our heritage CMP slurries and polishing pads businesses, as well as the KMG electronic chemicals business.  The Performance Materials segment includes KMG’s heritage pipeline performance and wood treatment businesses, and Cabot Microelectronics’ heritage QED business. For additional information, refer to Part 1, Item 1, “Business”, in our and KMG’s Annual Reports on Form 10-K for the fiscal year ended September 30, 2018 and July 31, 2018, respectively.

The unaudited Consolidated Financial Statements have been prepared by Cabot Microelectronics pursuant to the rules of the Securities and Exchange Commission (SEC) and accounting principles generally accepted in the United States of America (U.S. GAAP).  In the opinion of management, these unaudited Consolidated Financial Statements include all adjustments, consisting of normal recurring adjustments, necessary for the fair statement of Cabot Microelectronics’ financial position as of June 30, 2019, cash flows for the nine months ended June 30, 2019 and June 30, 2018, and results of operations for the three and nine months ended June 30, 2019 and June 30, 2018.  The Consolidated Balance Sheets as of September 30, 2018 were derived from audited financial statements. The results of operations for the three and nine months ended June 30, 2019 may not be indicative of results to be expected for future periods, including the fiscal year ending September 30, 2019.  Certain prior period amounts have been reclassified to conform to the current period presentation.  This Report on Form 10-Q does not contain all of the footnote disclosures from our annual financial statements and should be read in conjunction with the Consolidated Financial Statements and related notes thereto included in Cabot Microelectronics’ Annual Report on Form 10-K for the fiscal year ended September 30, 2018.

The Consolidated Financial Statements include the accounts of Cabot Microelectronics and its subsidiaries. All intercompany transactions and balances between the companies have been eliminated as of June 30, 2019.

USE OF ESTIMATES

The preparation of financial statements and related disclosures in conformity with U.S. GAAP requires management to make judgments, assumptions and estimates that affect the amounts reported in the Consolidated Financial Statements and accompanying notes. The accounting estimates that require management's most difficult and subjective judgments include, but are not limited to, those estimates related to bad debt expense, inventory valuation, impairment of long-lived assets, business combinations, goodwill, other intangible assets, share-based compensation, income taxes and contingencies. We base our estimates on historical experience, current conditions and on various other assumptions that we believe are reasonable under the circumstances. However, future events are subject to change and estimates and judgments routinely require adjustment. Actual results may differ from these estimates under different assumptions or conditions.

9

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS

Significant Accounting Policies and Estimates

Except for the discussion on revenue recognition below, no material changes have been made to the Company’s significant accounting policies disclosed in Note 2 of the Notes to the Consolidated Financial Statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2018.

REVENUE RECOGNITION

As of October 1, 2018, the Company began applying the provisions of Accounting Standards Codification 606-10, “Revenue from Contracts with Customers” (“ASC 606”), and all related applicable guidance using the modified retrospective method applied to those contracts that were not completed as of October 1, 2018.  The Company recognizes revenue under the core principle of depicting the transfer of control to the Company’s customers in an amount reflecting the consideration to which the Company expects to be entitled. In order to achieve that core principle, the Company applies the following five step approach: (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and, (5) recognize revenue when a performance obligation is satisfied.

Upon adoption of ASC 606, we recognized a $933 decrease to the opening balance of retained earnings, net of tax, due to the cumulative impact of adopting the new revenue standard. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods.  The Company changed its accounting policy for revenue recognition for customer incentives that provide free products and tiered pricing.  For free products, the new revenue standard requires that a portion of the transaction price be allocated to the free product and deferred until the product has been delivered.  We previously accrued for undelivered free product as a charge to cost of sales.  In prior fiscal years, in accordance with ASC 605, we did not consider prospective tiered pricing to represent a material right.

The cumulative effect of the changes made to our Consolidated Balance Sheet as of October 1, 2018 for the adoption of the new revenue standard was:

	Balance at September 30, 2018		Adjustments Due to ASC 606			Balance at October 1, 2018
Deferred income tax assets	$	5,840	$	261		$	6,101
Accrued expenses, income taxes payable and other current liabilities	82,983		(47		)	82,936
Other long-term liabilities	13,046		1,241			14,287
Retained earnings	$	471,673	$	(933	)	$	470,740

We have determined that the effect of applying the new revenue standard during the three and nine months ended June 30, 2019 was immaterial to our financial statements compared to revenue guidance in effect before the adoption of the new revenue standard.  As a result, for the three and nine months ended June 30, 2019, we are not disclosing the quantitative amount by which each financial statement line item is affected by the application of the new revenue standard.

As part of the adoption of ASU 606, the Company elected to use certain allowed practical expedients. For the Company’s contracts that have an original duration of one year or less as of the adoption date, the Company uses the practical expedient applicable to such contracts and does not consider the time value of money. Further, because of the short duration of these contracts, the Company has not disclosed the transaction price for the future performance obligations as of the end of each reporting period for contracts having an expected duration of one year or less.  See Note 3 of this Report on Form 10-Q for disaggregated revenue, the reconciliation of contract balances and transaction price allocation to remaining performance obligations for contracts expected to remain effective beyond one year.

10

Performance Obligations and Material Rights

At contract inception, the Company assesses the goods and services promised in its contracts with customers and identifies a performance obligation for each material promise to the customer.  A performance obligation is a promise in a contract to transfer a distinct good or service, or a bundle of goods or services, to the customer, and is the unit of accounting under ASC 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. A majority of the Company’s contracts have a single performance obligation which represents, in most cases, the products, equipment or services being sold to the customer. Some contracts include multiple performance obligations, including prospective tiered price discounts or delivery of free product that we have concluded represents a material right. Contracts with prospective tiered price discounts require judgment in determining if that discount represents a material right.

Contracts vary in length, and payment terms vary by the type and location of the Company’s customers and the products or services offered. However, the period of time between invoicing and when payment is due is typically not significant and has no significant financing components.  Customers pay in accordance with negotiated terms upon receipt of goods or completion of services.  For these contracts, the transaction price is determined upon establishment of the contract that contains the final terms of the sale, including the description, quantity, and price of goods or services purchased.  In certain instances, we receive consideration from a customer prior to transferring goods or services to the customer under the terms of a sales contract.  In such cases, we record deferred revenue until the performance obligation is satisfied, which represents a contract liability, and is included in the contract liabilities discussed in Note 3 of this Report on Form 10-Q.

The Company recognizes revenue related to product sales at a point in time following the transfer of control of such products to the customer, which generally occurs upon shipment, or delivery depending on the terms of the underlying contracts. The Company considers control to have transferred upon shipment or delivery because the Company has a present right to payment at that time, the customer has legal title to the asset, the Company has transferred physical possession of the asset, and the customer has significant risks and rewards of ownership of the asset.  Revenue is recognized on consignment sales when control transfers to the customer, generally at the point of customer usage of the product. The Company also records revenue for services provided to the pipeline and oilfield energy industries.  These services include preventive maintenance, repair and specialized isolation sealing on pipelines and training. Revenue is recorded at a point in time when the services are completed as this is when right to payment and customer acceptance occurs.

For sales contracts that contain multiple performance obligations, the Company allocates the transaction price to each performance obligation identified in the contract based on relative standalone selling prices or estimates of such prices.  Standalone selling price, once established, is then used to allocate total consideration proportionally to the various performance obligations within a contract. Most contracts where we have determined there to be multiple performance obligations relate to where we have identified the existence of a material right such that we provide prospective tiered pricing discounts or free product. When we invoice for products shipped under these contracts, we defer the revenue associated with these rights on the balance sheet as a contract liability. Revenue is recognized when the customer exercises the option to purchase goods at a discount in the case of the prospective tiered pricing discounts or when we ship the free product.

Variable Consideration

The primary type of variable consideration present in the Company’s contracts are rebates and early payment discounts, both of which are immaterial. Early payment discounts are offered on a limited basis and are not significant.  The Company also offers rebates based upon cumulative volume of purchases within a quarter and accrues for the rebate obligation within the quarter that the rebate is earned.  ASC 606 did not change the accounting for rebates under ASC 605.

Costs to Obtain and Fulfill a Contract

 For certain contracts within the Performance Materials segment, commissions are paid to sales agents based upon a percentage of end-customer invoice value. Agents are paid the commissions after funds are received by the Company from its customers.  Under ASC 340, sales commissions are required to be capitalized and expensed over the associated contract period.  However, as a practical expedient, the Company does not capitalize commissions as the associated contracts are generally one year or less in duration. For shipping and handling activities performed after a customer obtains control of the goods, the Company has elected to account for these costs as activities to fulfill the promise to transfer the goods and included in cost of sales.

11

EFFECTS OF RECENT ACCOUNTING PRONOUNCEMENTS

In February 2016, the FASB issued ASU No. 2016-02, "Leases" (Topic 842).  The provisions of ASU 2016-02 require a dual approach for lessee accounting under which a lessee would recognize a right-of-use asset and a corresponding lease liability.  Leases will be classified as either finance or operating leases.  For finance leases, a lessee will recognize interest expense and amortization of the right-of-use asset, and for operating leases, the lessee will recognize a straight-line total lease expense.  The guidance also requires qualitative and specific quantitative disclosures to supplement the amounts recorded in the financial statements, to afford better understanding of an entity's leasing activities, including any significant judgments and estimates.   The guidance was amended through various ASU's subsequent to ASU 2016-02, all of which will be effective for us beginning October 1, 2019, but early adoption is permitted.  We have finished reviewing the population of our lease contracts and are in the process of implementing a new third party lease software system. The Company currently plans to elect the optional package of practical expedients to not reassess prior conclusions related to contracts containing leases, lease classification and initial direct costs and therefore, does not expect the adoption of ASU 2016-02 to have a significant impact on the Consolidated Statements of Income. We expect to adopt the new standard in our first quarter of fiscal 2020 applying the optional transition method upon adoption. We continue to evaluate the amount of right-of-use asset and lease liability that will ultimately be recorded on the Consolidated Balance Sheets and the impact on the Consolidated Statements of Income.

In June 2016, the FASB issued ASU No. 2016-13, "Measurement of Credit Losses on Financial Instruments" (Topic 326). The provisions of this standard require financial assets measured at amortized cost to be presented at the net amount expected to be collected. An allowance account would be established to present the net carrying value at the amount expected to be collected. ASU 2016-13 also provides that credit losses relating to available-for-sale debt securities should be recorded through an allowance for credit losses. The guidance was amended through various ASU's subsequent to ASU 2016-13, all of which will be effective for us beginning October 1, 2020, but early adoption is permitted as of October 1, 2019. We are currently evaluating the impact of implementation of this standard on our financial statements.

In March 2017, the FASB issued ASU No. 2017-07 "Improving the Presentation of Net Period Pension Cost and Net Period Postretirement Benefit Cost" (Topic 715). The provisions of ASU 2017-07 provided specific guidance on the presentation of the components of net benefit cost.  We adopted this standard ASU 2017-07 effective October 1, 2018 and applied it retrospectively. Pursuant to the adoption, net service costs are recorded as fringe benefit expense under cost of sales and operating expenses, and all other costs are recorded in the Other income (expense), net in our Consolidated Statements of Income. The impact of the retrospective adoption in fiscal year 2018 is not material.

In May 2017, the FASB issued ASU No. 2017-09 "Scope of Modification Accounting" (Topic 718). The provisions of ASU 2017-09 provide specific guidance about which changes to the term or conditions of a share-based payment require an entity to apply modification accounting.  We adopted ASU 2017-09 effective October 1, 2018 and will apply this new standard to our share-based compensation awards, to the extent modified.

In August 2017, the FASB issued ASU No. 2017-12 "Derivatives and Hedging" (Topic 815). The provisions of this standard amend the hedge accounting model in ASC 815 to expand an entity's ability to hedge nonfinancial and financial risk components, reduce complexity in fair value hedges of interest rate risk, eliminate the requirement to separately measure and report hedge ineffectiveness, and generally require the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. The guidance also eases certain documentation and assessment requirements and modifies the accounting for components excluded from the assessment of hedge effectiveness.  We early adopted this guidance effective January 1, 2019, and we did not have any hedges that existed as of the initial application date.  We applied the new guidance to the interest rate swap that we entered into during our second quarter of fiscal 2019. Pursuant to the guidance, we performed initial quantitative hedge effectiveness testing upon the inception of the hedge, and determined the hedge to be highly effective.  Therefore, unrealized changes in fair value are recorded in other comprehensive income.  In addition, we reclassify the realized gains and losses out of other comprehensive income, and into interest expense in our Consolidated Statements of Income, which is the same financial statement line as the hedged item.  We will perform subsequent assessments of hedge effectiveness qualitatively on a quarterly basis.

In February 2018, the FASB issued ASU No. 2018-02 "Income Statement – Reporting Comprehensive Income (Topic 220)".  The amendments in this standard allow a company to reclassify the stranded tax effects resulting from the Tax Cuts and Jobs Act (the "Tax Act") from accumulated other comprehensive income to retained earnings. ASU 2018-02 will be effective for us beginning October 1, 2019, but early adoption is permitted. We are currently evaluating and quantifying the amount to be reclassified into retained earnings and expect to record the reclassification on October 1, 2019.

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In June 2018, the FASB issued ASU No. 2018-07 " Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting."  The ASU simplified the accounting for share-based payments granted to nonemployees for goods and services, therefore guidance on such payments to nonemployees would be mostly aligned with the requirements for share-based payments granted to employees. ASU 2018-07 will be effective for us beginning October 1, 2019, but early adoption is permitted (but no earlier than the adoption date of Topic 606). We do not expect implementation of this standard to have material impact on our financial statements.

In August 2018, the FASB issued ASU No. 2018-13 " Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement".  The ASU provides specific guidance on various disclosure requirements in Topic 820, including removal, modification and addition to current disclosure requirements. ASU 2018-13 will be effective for us beginning October 1, 2020, but early adoption is permitted. We are currently evaluating the impact of implementation of this standard on our disclosures.

In August 2018, the FASB issued ASU No. 2018-15 " Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force)".  The ASU Requires an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. ASU 2018-15 will be effective for us beginning October 1, 2020, but early adoption is permitted. We are currently evaluating the impact of implementation of this standard on our financial statements.

3.  REVENUE FROM CONTRACTS WITH CUSTOMERS

Disaggregation of Revenue

The Company disaggregates revenue by product area and segment as it best depicts the nature and amount of the Company’s revenue.

The following table shows revenue generated by product area during the three and nine months ended June 30, 2019 and 2018:

	Three Months Ended June 30,				Nine Months Ended June 30,
	2019		2018		2019		2018
Revenue:
Electronic Materials:
CMP Slurries	$	108,617	$	122,893	$	345,244	$	352,414
Electronic Chemicals	80,103		—		198,474		—
CMP Pads	23,403		20,917		71,868		60,813
Total Electronic Materials	212,123		143,810		615,586		413,227
Performance Materials	59,759		6,627		143,465		20,167
Total revenue	$	271,882	$	150,437	$	759,051	$	433,394

Reconciliation of Contract Liability Balances

The following table provides information about contract liability balances:

	June 30, 2019		October 1, 2018
Contract liabilities (current)	$	3,958	$	5,310
Contract liabilities (noncurrent)	1,378		1,239

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The contract liability balances as of October 1, 2018 in the table above include the amounts recorded upon the adoption of ASC 606.  At June 30, 2019, the current portion of contract liabilities of $3,958 is included in accrued liabilities, taxes payable and other current liabilities, and the noncurrent portion of $1,378 is included in other long-term liabilities in the Consolidated Balance Sheets.  The amount of revenue recognized during the three and nine months ended June 30, 2019 that was included in the opening current contract liability balances in our Performance Materials segment was $697 and $4,857, respectively.  The amount of revenue recognized during the three and nine months ended June 30, 2019 that was included in our opening contract liability balances in our Electronic Materials segment was not material.

Transaction Price Allocated to Remaining Performance Obligations

The table below discloses (1) the aggregate amount of the transaction price allocated to performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period for contracts with an original duration of greater than one year and (2) when the Company expects to recognize this revenue.

	Less Than 1 Year		1-3 Years		3-5 Years		Total
Revenue expected to be recognized on contract liability amounts as of June 30, 2019	$	211	$	975	$	403	$	1,589

4. BUSINESS COMBINATION

On the Acquisition Date, the Company completed its acquisition of 100% of the outstanding stock of KMG, which was a publicly held company headquartered in Fort Worth, Texas. KMG specialized in producing, processing, and distributing electronic chemicals for the semiconductor industry and performance materials for the pipeline operations and energy, and industrial wood preservation industries. We acquired KMG to extend and strengthen our position as one of the leading suppliers of consumable materials to the semiconductor industry and to expand our portfolio with the addition of KMG’s performance materials businesses, which we believe enables us to become a leading global provider of performance products and services to the pipeline operations and energy industries. The purchase consideration was $1,513,235, including consideration transferred of $1,536,452, less cash acquired of $23,217. The consideration was comprised of cash consideration to KMG common shareholders and equity award holders, stock consideration to KMG common shareholders and equity award holders, and cash consideration in the form of the retirement of KMG’s preexisting debt obligations.  Under the terms of the definitive agreement to acquire KMG, each share of KMG common stock was converted into the right to receive $55.65 in cash and 0.2000 of a share of Cabot Microelectronics common stock. As a result, we issued 3,237,005 shares of our common stock to KMG’s common stockholders, with a stock price of $102.27 on the Acquisition Date. In connection with the Acquisition, we entered into a credit agreement (the “Credit Agreement”), which provided us with a seven-year, $1,065,000 term loan facility (the “Term Loan Facility”), which we drew on the Acquisition Date to fund the Acquisition along with cash on hand, and a five-year, $200,000 revolving credit facility (the “Revolving Credit Facility”), which has not been drawn. In connection with the borrowing, we incurred $21,408 in debt issuance costs and original issue discount fees, $859 of which relates to the Revolving Credit Facility and is recorded as a prepaid asset, and the remaining $20,549 in debt issuance costs relates to the Term Loan Facility and is presented as a reduction of long-term debt. These debt issuance costs are amortized and recorded in Interest expense in the Consolidated Statements of Income over the life of the Revolving Credit Facility and Term Loan Facility, respectively. See below for a summary of the different components that comprise the total consideration.

	Amount
Total cash consideration paid for KMG outstanding common stock and equity awards	$	900,756
Cash provided to payoff KMG debt	304,648
Total cash consideration paid	1,205,404
Fair value of Cabot Microelectronics common stock issued for KMG outstanding common stock and equity awards	331,048
Total consideration transferred	$	1,536,452

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The following table summarizes the preliminary allocation of fair values of assets acquired and liabilities assumed as of the Acquisition Date.

	Amount
Cash	$	23,217
Accounts receivable	64,711
Inventories	68,963
Prepaid expenses and other current assets	14,798
Property, plant and equipment	147,398
Intangible assets	844,800
Other long-term assets	6,208
Accounts payable	(28,894		)
Accrued expenses and other current liabilities	(43,451		)
Deferred income taxes liabilities	(164,165		)
Other long-term liabilities	(3,754		)
Total identifiable net assets acquired	929,831
Goodwill	606,621
Total consideration transferred	$	1,536,452

The Acquisition was accounted for using the acquisition method of accounting. Tangible and identifiable intangible assets acquired and liabilities assumed are recorded at fair value as of the Acquisition Date. These valuations are preliminary based on the information currently available, and the expectations and assumptions that have been deemed reasonable by the Company’s management.  The Company has not finalized the fair value determinations of the assets acquired and liabilities assumed and expects to finalize such as soon as practicable, but not later than one-year from the Acquisition Date.  As a result, certain adjustments have been made and will continue to be made to the Company’s Consolidated Balance Sheet and Statements of Income.

The fair values of identifiable assets and liabilities acquired were developed with the assistance of a third-party valuation firm. The fair value of acquired property, plant and equipment is primarily valued at its “value-in-use.” The fair value of acquired identifiable intangible assets was determined using the “income approach” on an individual asset basis. The key assumptions used in the calculation of the discounted cash flows include projected revenue, gross margin, operating expenses, discount rate and customer attrition.  The valuations and the underlying assumptions have been deemed reasonable by the Company’s management. There are inherent uncertainties and management judgment required in these determinations.

The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the Acquisition Date:

	Fair Value		Estimated Useful Life (years)
Customer relationships	$	704,000	15-20
Technology and know-how	85,500		9-11
Trade name - Flowchem	46,000		Indefinite
Trade name - all other	7,000		1-15
EPA product registration rights	2,300		15
Total intangible assets	$	844,800

Customer relationships represent the estimated fair value of the underlying relationships and agreements with KMG’s customers and are being amortized on an accelerated basis in order for the expense to most accurately match the periods of highest cash flows attributable to the identified relationships. Technology and know-how represent the estimated fair value of KMG’s technology, processes and knowledge regarding its product offerings, and are being amortized on a straight-line basis. Trade names represent the estimated fair value of the brand and name recognition associated with the marketing of KMG’s product offerings and are being amortized on a straight-line basis, except for the Flowchem trade name, which we believe has an indefinite life. These intangible assets are capitalized and accounted for as indefinite-lived intangible assets and will be subject to impairment testing. The intangible assets subject to amortization have a weighted average useful life of 17.9 years.

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The excess of consideration transferred over the fair value of net assets acquired was recorded as goodwill, and is not deductible for income tax purposes. The goodwill is primarily attributable to anticipated revenue growth from the combined company product portfolio, expected synergies of the combined company, and the assembled workforce of KMG. The preliminary allocation of goodwill to each of the Electronic Materials and Performance Materials segments as a result of the Acquisition was $261,733 and $344,888, respectively.

For the three and nine months ended June 30, 2019, we recorded $2,910 and $33,108 in acquisition and integration-related expenses, including transaction costs, stock compensation expense, severance and retention costs. These items are included within Selling, general and administrative in the Consolidated Statements of Income. In the same three and nine months ended June 30, 2019, we also recorded a charge of $42 and $14,869, respectively related to the fair value write-up of acquired inventory sold, which is included in Cost of sales in the Consolidated Statements of Income.

KMG’s results of operations have been included in our unaudited Consolidated Statements of Income and Consolidated Statements of Comprehensive Income from the Acquisition Date. Net sales of the acquired KMG business since the Acquisition Date through June 30, 2019 were $316,690. KMG’s net income since the Acquisition Date was $4,782, which includes $21,889 of acquisition-related costs and a $14,869 charge for fair value write-up of inventory sold. Further, additional amortization and depreciation expense associated with recording KMG’s net assets at fair value decreased KMG’s net income post-Acquisition.

The following unaudited supplemental pro forma information summarizes the combined results of operations for Cabot Microelectronics and KMG as if the Acquisition had occurred on October 1, 2017.

	Three Months Ended June 30,				Nine Months Ended June 30,
	2019		2018		2019		2018
Revenues	$	271,882	$	272,589	$	821,029	$	784,694
Net income (loss)	16,077		33,211		88,938		(1,369		)
Earnings per share - basic	$	0.55	$	1.15	$	3.07	$	(0.05	)
Earnings per share - diluted	$	0.54	$	1.12	$	3.02	$	(0.05	)

The following costs are included in the three and nine months ended June 30, 2018:

• Non-recurring transaction costs of $568 and $31,611, respectively.

• Non-recurring transaction-related employee costs, such as accelerated stock compensation expense, retention and severance expense of $1,380 and $37,392, respectively.

• Non-recurring charge for fair value write-up of inventory sold of $0 and $14,859, respectively.

The historical financial information has been adjusted by applying the Company’s accounting policies and giving effect to the pro forma adjustments, which consist of (i) amortization expense associated with identified intangible assets; (ii) depreciation of fixed asset step-up (for pre-acquisition periods only); (iii) accretion of inventory step-up value; (iv) the elimination of interest expense on pre-acquisition KMG debt and replacement of interest expense related to the acquisition-related financing; (v) transaction-related costs; (vi) accelerated share-based compensation expense (pre-acquisition periods only); (vii) retention and severance expense incurred as a direct result of the Acquisition; and (viii) an adjustment to tax-effect the aforementioned unaudited pro forma adjustments using an estimated weighted-average effective income tax rate of each entity and the jurisdictions to which the above adjustments relate. The pro forma consolidated results are not necessarily indicative of what the consolidated results actually would have been had the Acquisition been completed on October 1, 2017. The pro forma consolidated results do not purport to project future results of combined operations, nor do they reflect the expected realization of any revenue or cost synergies associated with the Acquisition.

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5. FAIR VALUE OF FINANCIAL INSTRUMENTS

Fair value is defined as the price that would be received from the sale of an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.  The Financial Accounting Standards Board (“FASB”) established a three-level hierarchy for disclosure based on the extent and level of judgment used to estimate fair value.  Level 1 inputs consist of valuations based on quoted market prices in active markets for identical assets or liabilities.  Level 2 inputs consist of valuations based on quoted prices for similar assets or liabilities, quoted prices for identical assets or liabilities in an inactive market, or other observable inputs.  Level 3 inputs consist of valuations based on unobservable inputs that are supported by little or no market activity.

The following table presents financial instruments, other than long-term debt, that we measured at fair value on a recurring basis at June 30, 2019 and September 30, 2019.  See Note 10 for a detailed discussion of our long-term debt.  We have classified the following assets and liabilities in accordance with the fair value hierarchy set forth in the applicable standards.  In instances where the inputs used to measure the fair value of an asset fall into more than one level of the hierarchy, we have classified them based on the lowest-level input that is significant to the determination of the fair value. 

June 30, 2019	Level 1		Level 2		Level 3		Total Fair Value
Assets:
Cash and cash equivalents	$	168,678	$	—	$	—	$	168,678
Other long-term investments	1,411		—		—		1,411
Derivative financial instruments	—		$	8	—		8
Total assets	$	170,089	$	8	$	—	$	170,097
Liabilities:
Derivative financial instruments	—		20,217		—		20,217
Total liabilities	$	—	$	20,217	$	—	$	20,217

September 30, 2018	Level 1		Level 2		Level 3		Total Fair Value
Assets:
Cash and cash equivalents	$	352,921	$	—	$	—	$	352,921
Other long-term investments	1,137		—		—		1,137
Total assets	$	354,058	$	—	$	—	$	354,058
Liabilities:
Derivative financial instruments	—		339		—		339
Total liabilities	$	—	$	339	$	—	$	339

Our cash and cash equivalents consist of various bank accounts used to support our operations and investments in institutional money-market funds that are traded in active markets.  We invest only in AAA-rated, prime institutional money market funds, comprised of high quality, short-term fixed income securities. Our other long-term investments represent the fair value of investments under the Cabot Microelectronics Supplemental Employee Retirement Plan (SERP), which is a nonqualified supplemental savings plan.  The fair value of the investments is determined through quoted market prices within actively traded markets. Although the investments are allocated to individual participants and investment decisions are made solely by those participants, the SERP is a nonqualified plan.   Consequently, the Company owns the assets and the related offsetting liability for disbursement until a participant makes a qualifying withdrawal.  The long-term investment was adjusted to $1,411 in the third quarter of fiscal 2019 to reflect its fair value as of June 30, 2019.

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Our derivative financial instruments include foreign exchange contracts and an interest rate swap.  During the second quarter, we entered into a floating-to-fixed interest rate swap agreement to hedge the variability in LIBOR-based interest payments on a portion of our outstanding variable rate debt.  The fair value of our derivative instruments is estimated using standard valuation models and market-based observable inputs over the contractual term, including one-month LIBOR-based yield curves for the interest rate swap, and forward rates and/or the Overnight Index Swap (OIS) curve for forward foreign exchange contracts, among others.  We consider the risk of nonperformance, including counterparty credit risk, in the calculation of the fair value of derivative financial instruments.  See Note 11 of this Report on Form 10-Q for more information on our use of derivative financial instruments.

6. INVENTORIES

Inventories consisted of the following:

	June 30, 2019		September 30, 2018
Raw materials	$	59,684	$	35,150
Work in process	13,119		8,117
Finished goods	72,980		28,659
Total	$	145,783	$	71,926

7. GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill was $708,390 as of June 30, 2019, and $101,083 as of September 30, 2018.  The increase in goodwill was due to $606,621 in goodwill related to the Acquisition offset by $686 in foreign exchange fluctuations.  The amount of goodwill assigned to each of the Electronic Materials and Performance Materials segments was $358,108 and $350,282, respectively.

The components of other intangible assets are:

	June 30, 2019				September 30, 2018
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Other intangible assets subject to amortization:
Product technology, trade secrets and know-how	$	134,415	$	34,598	$	48,825	$	25,305
Acquired patents and licenses	10,570		8,356		8,270		8,252
Customer relationships, trade names, and distribution rights	740,058		51,225		28,068		17,574
Total other intangible assets subject to amortization	885,043		94,179		85,163		51,131
Other intangible assets not subject to amortization:
Other indefinite-lived intangibles*	47,170				1,170
Total other intangible assets not subject to amortization	47,170				1,170
Total other intangible assets	$	932,213	$	94,179	$	86,333	$	51,131

*Other indefinite-lived intangible assets not subject to amortization consist primarily of trade names.

As discussed in Note 4 of this Report on Form 10-Q, we recorded $844,800 of intangible assets related to the Acquisition.  The allocation of the amount into the various categories of intangible assets, as well as useful lives we have established, are discussed in Note 4.

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Amortization expense on our intangible assets was $16,926 and $43,244 for the three and nine months ended June 30, 2019, respectively, and was $1,780 and $5,716 for the three and nine months ended June 30, 2018, respectively. Estimated future amortization expense for the five succeeding fiscal years is as follows:

Fiscal Year	Estimated Amortization Expense
Remainder of 2019	$	16,931
2020	87,940
2021	87,243
2022	79,832
2023	67,674

Goodwill and indefinite-lived intangible assets are tested for impairment annually in the fourth quarter of our fiscal year or more frequently if indicators of potential impairment exist, using a fair-value-based approach. The recoverability of goodwill is measured at the reporting unit level, which is defined as either an operating segment or one level below an operating segment. An entity has the option to assess the fair value of a reporting unit either using a qualitative analysis ("step zero") or a quantitative analysis ("step one"). Similarly, an entity has the option to use a step zero or a step one approach to determine the recoverability of indefinite-lived intangible assets. In 2018, we chose to use a step one analysis for both goodwill impairment and for indefinite-lived intangible asset impairment, with the exception of our CMP slurries reporting unit, for which we chose to use a step zero analysis for fiscal 2018.

We completed our annual impairment test during our fourth quarter of fiscal 2018 and concluded that no impairment existed.  There were no indicators of potential impairment during the quarter ended June 30, 2019, so it was not necessary to perform an impairment review for goodwill and indefinite-lived intangible assets during the quarter.  There have been no impairment charges recorded on the goodwill for any of our reporting units.

8. OTHER LONG-TERM ASSETS

Other long-term assets consisted of the following:

	June 30, 2019		September 30, 2018
Long-term contract assets	674		1,548
Long-term SERP Investment	1,411		1,137
Prepaid unamortized debt issuance cost - revolver	752		—
Other long-term assets	2,821		1,979
Total	$	5,658	$	4,664

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9. ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES

Accrued expenses, income taxes payable and other current liabilities consisted of the following:

	June 30, 2019		September 30, 2018
Accrued compensation	$	31,362	$	35,367
Income taxes payable	14,418		18,045
Dividends payable	12,879		10,822
Taxes, other than income taxes	6,806		1,976
KMG - Bernuth warehouse fire related (See Note 12)	4,450		—
Accrued interest	3,677		—
Contract liabilities	3,958		4,894
Goods and services received, not yet invoiced	3,772		1,954
Other accrued expenses	13,939		9,925
Total	$	95,261	$	82,983

10. DEBT

On the Acquisition Date, we entered into the Credit Agreement by and among the Company, the lenders party thereto and JPMorgan Chase Bank, N.A., as administrative agent, which provides for senior secured financing of up to $1,265.0 million, consisting of the Term Loan Facility in an aggregate principal amount of $1,065.0 million and the Revolving Credit Facility in an aggregate principal amount of up to $200.0 million, including a letter of credit sub-facility of up to $50.0 million.  The Term Loan Facility and the Revolving Credit Facility are referred to as the “Credit Facilities.”

Proceeds of the loans borrowed under the Term Loan Facility on the Acquisition Date were used to fund, in part, the Acquisition and certain of KMG’s existing indebtedness, and to pay related fees and expenses. The Revolving Credit Facility remains undrawn.

The Credit Facilities are guaranteed by each of the Company’s wholly-owned domestic subsidiaries, including KMG and its subsidiaries, and are secured by substantially all assets of the Company and of each subsidiary guarantor, in each case subject to certain exceptions.

Borrowings under the Credit Facilities bear interest at a rate per annum equal to, at the Company’s option, either (a) a LIBOR, subject to a 0.00% floor, or (b) a base rate, in each case plus an applicable margin of, in the case of borrowings under the Term Loan Facility, 2.25% for LIBOR loans and 1.25% for base rate loans and, in the case of borrowings under the Revolving Credit Facility, initially, 1.50% for LIBOR loans and 0.50% for base rate loans. The applicable margin for borrowings under the Revolving Credit Facility varies depending on the Company’s first lien secured net leverage ratio. The Company is also required to pay a commitment fee currently equal to 0.25% per annum to the lenders under the Revolving Credit Facility in respect of the unutilized commitments thereunder. The commitment fee under the Revolving Credit Facility varies depending on the Company’s first lien secured net leverage ratio.

The Term Loan Facility matures on November 15, 2025, the seven-year anniversary of the Acquisition Date, and amortizes in equal quarterly installments of 0.25% of the initial principal amount, starting with the first full fiscal quarter after the Acquisition Date. The Revolving Facility matures on November 15, 2023, the five-year anniversary of the Acquisition Date. In addition, the Company is required to prepay outstanding loans under the Term Loan Facility, subject to certain exceptions, with up to 50% of the Company’s annual excess cash flow, as defined under the Credit Agreement, and 100% of the net cash proceeds of certain recovery events and non-ordinary course asset sales.

The Company may generally prepay outstanding loans under the Credit Facilities at any time, without prepayment premium or penalty, subject to customary “breakage” costs with respect to LIBOR rate loans.  We made a prepayment of $55.0 million and a total prepayment of $100.0 million during the three and nine months ended June 30, 2019, respectively.

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The Revolving Credit Facility requires that the Company maintain a maximum first lien secured net leverage ratio, as defined in the Credit Agreement, of 4.00 to 1.00 as of the last day of each fiscal quarter if any revolving loans are outstanding, commencing with the first full fiscal quarter after the Acquisition Date.

The Credit Agreement contains certain affirmative and negative covenants that limit the ability of the Company, among other things and subject to certain significant exceptions, to incur debt or liens, make investments, enter into certain mergers, consolidations, asset sales and acquisitions, pay dividends and make other restricted payments and enter into transactions with affiliates. We believe we are in compliance with these covenants.

The Credit Agreement contains certain events of default, including relating to a change of control. If an event of default occurs, the lenders under the Credit Facilities will be entitled to take various actions, including the acceleration of amounts due under the Credit Facilities.

At June 30, 2019, the fair value of the Term Loan Facility, using level 2 inputs, approximated its carrying value of $962,338 as the loan bears a floating market rate of interest. As of June 30, 2019, $13,313 of the debt outstanding was classified as short-term, and $18,655 of debt issuance costs related to our Term Loan were presented as a reduction of long-term debt.

In the second quarter of fiscal 2019, we entered into a floating-to-fixed interest rate swap agreement to hedge the variability in our LIBOR-based interest payments on approximately 70% of our Term Loan Facility balance.  See Note 11 in this Report on Form 10-Q for additional information.

Principal repayments of the Term Loan Facility are generally made on the last calendar day of each quarter if that day is considered to be a business day.  As of June 30, 2019, scheduled principal repayments of the Term Loan were:

Fiscal Year	Principal Repayments
Remainder of 2019	$	5,325
2020	10,650
2021	10,650
2022	10,650
2023	10,650
Greater than 5 years	914,413
Total	$	962,338

11. DERIVATIVE FINANCIAL INSTRUMENTS

We are exposed to various market risks, including risks associated with interest rates and foreign currency exchange rates.  We enter into certain derivative transactions to mitigate the volatility associated with these exposures.  We have policies in place that define acceptable instrument types we may enter into and we have established controls to limit our market risk exposure.  We do not use derivative financial instruments for trading or speculative purposes.  In addition, all derivatives, whether designated in hedging relationships or not, are required to be recorded on the Consolidated Balance Sheets at fair value on a gross basis.

Cash Flow Hedges - Interest Rate Swap Agreement

During the second quarter, we entered into a floating-to-fixed interest rate swap agreement to hedge the variability in LIBOR-based interest payments on a portion of our outstanding variable rate debt.  As of June 30, 2019, the notional value of the swap was $746,000 and this value is scheduled to decrease bi-annually, and to expire on January 31, 2024.

We have designated this swap agreement as a cash flow hedge pursuant to ASC 815, "Derivatives and Hedging".  Based on certain quantitative and qualitative assessments, we have determined that the hedge is highly effective and qualifies for hedge accounting.  Accordingly, unrealized gains and losses on the hedge are recorded in other comprehensive income.  Realized gains and losses are recorded on the same financial statement line as the hedged item, which is Interest expense.

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Foreign Currency Contracts Not Designated as Hedges

On a regular basis, we enter into forward foreign exchange contracts in an effort to mitigate the risks associated with currency fluctuations on certain foreign currency balance sheet exposures.  These foreign exchange contracts do not qualify for hedge accounting; therefore, the gains and losses resulting from the impact of currency exchange rate movements on our forward foreign exchange contracts are recognized as Other income (expense), net in the accompanying Consolidated Statements of Income in the period in which the exchange rates change.  As of June 30, 2019 and September 30, 2018, the notional amounts of the forward contracts we held to purchase U.S. dollars in exchange for foreign currencies were $9,636 and $7,652, respectively, and the notional amounts of forward contracts we held to sell U.S. dollars in exchange for foreign currencies were $17,880 and $24,860, respectively.

Net Investment Hedge - Foreign Exchange Contracts

In September 2017, we entered into forward contracts to sell 100 billion Korean won and buy U.S. dollars, which we subsequently terminated in the third quarter of fiscal 2018. We had designated these forward contracts as effective net investment hedges.

The fair value of our derivative instruments included in the Consolidated Balance Sheets, which was determined using Level 2 inputs, was:

		Derivative Assets				Derivative Liabilities
	Consolidated Balance Sheet Location	June 30, 2019		September 30, 2018		June 30, 2019		September 30, 2018
Derivatives designated as hedging instruments
Interest rate swap contract	Accrued expenses, income taxes payable and other current liabilities	$	—	$	—	$	4,274	$	—
	Other long-term liabilities	—		$	—	$	15,753	$	—
Derivatives not designated as hedging instruments
Foreign exchange contracts	Prepaid expenses and other current assets	$	8	$	—	$	—	$	—
	Accrued expenses, income taxes payable and other current liabilities	$	—	$	—	$	190	$	339

The following table summarizes the effect of our derivative instruments on our Consolidated Statements of Income for the three and nine months ended June 30, 2019 and 2018:

		(Loss) Recognized in Statement of Income
		Three Months Ended						Nine Months Ended
	Statement of Income Location	June 30, 2019			June 30, 2018			June 30, 2019			June 30, 2018
Derivatives not designated as hedging instruments
Foreign exchange contracts	Other income (expense), net	$	(29	)	$	(1,080	)	$	(67	)	$	(1,002	)

The interest rate swap agreement has been deemed to be effective, and realized gains and losses were immaterial to our Consolidated Statement of Income.  We recorded an unrealized loss of $15,536, net of tax, in Accumulated comprehensive income during the nine months ended June 30, 2019 for this interest rate swap.  As of June 30, 2019, during the next 12 months, we expect approximately $4,274 to be reclassed from Accumulated other comprehensive income (loss) into Interest expense related to our interest rate swap based on projected rates of the LIBOR forward curve as of June 30, 2019.

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12. COMMITMENTS AND CONTINGENCIES

LEGAL PROCEEDINGS AND OTHER CONTINGENCIES

We periodically become a party to legal proceedings, arbitrations, and regulatory proceedings (“contingencies”) arising in the ordinary course of our business operations. The ultimate resolution of these contingencies is subject to significant uncertainty, and should we fail to prevail in any of them or should several of them be resolved against us in the same reporting period, these matters could, individually or in the aggregate, be material to our consolidated financial statements. One of these contingencies, related to Star Lake Canal, which we assumed in connection with the Acquisition, is discussed below. The ultimate outcome of these matters, however, cannot be determined at this time, nor can the amount of any potential loss be reasonably estimated, and as a result except where indicated no amounts have been recorded in our consolidated financial statements.  The Company records legal costs associated with loss contingencies as expenses in the period in which they are incurred.

On May 31, 2019, a fire occurred at the warehouse of the facility of KMG’s subsidiary, KMG-Bernuth, in Tuscaloosa, Alabama, which processes pentachlorophenol (“penta”) for sale to customers in the United States and Canada. The warehouse fire, which we believe originated from non-hazardous waste materials temporarily stored in the warehouse for recycling purposes, caused no injuries and was extinguished in less than an hour. Company personnel investigated the incident, and KMG-Bernuth commenced cleanup with oversight from certain local, state and federal authorities. The carrying value of the warehouse and the affected inventory are not material. Applying the accounting guidance under ASC 410-30, Environmental Obligations and ASC 450, Contingencies, we determined that since we have environmental obligations as of the date of the fire, costs for the fire waste cleanup and disposal should be recognized to the extent they are probable and reasonably estimable. We have applied these criteria and recorded an undiscounted amount of $4,200 loss contingency regarding disposal costs that can be reasonably estimated at this time. These disposal costs were charged to Cost of sales. There are potential additional disposal and other costs that cannot be reasonably estimated as of this time related to materials in the warehouse or otherwise impacted by the incident. We will continue to update the estimated losses as new information becomes available. We also recognized $250 in Selling, general and administrative expense for professional fees incurred during the quarter related to the incident.

In addition, we are working with our insurance carriers on possible recovery of losses and costs, but at this point we cannot reasonably estimate whether we will receive, or the amount of, any potential insurance recoveries. As such, no insurance recoveries have been recognized as of June 30, 2019.

Separately, the United States Environmental Protection Agency (“EPA”) has notified KMG-Bernuth, that the EPA considered it to be a potentially responsible party under the Comprehensive Environmental Response, Compensation and Liability Act of 1980, as amended (“CERCLA”) by virtue of its relationship with certain alleged predecessor companies, including Idacon, Inc (f/k/a Sonford Chemical Company) in connection with the Star Lake Canal Superfund Site near Beaumont, Texas. The EPA has estimated that the remediation will cost approximately $22.0 million. KMG-Bernuth and approximately seven other parties entered into an agreement with the EPA in September 2016 to complete a remedial design phase of the remediation of the site. The remediation work will be performed under a separate future agreement. Although KMG-Bernuth has not conceded liability, a reserve in connection with the remedial design has been established, and as of June 30, 2019, the reserve remaining was $1,008.

We also may face other governmental or third-party claims, or otherwise incur costs, relating to cleanup of, or for injuries resulting from, contamination at sites associated with this or other past and present operations. We accrue for environmental liabilities when a determination can be made that they are probable and reasonably estimable. Other than as described herein, we are not involved in any legal proceedings that we believe could have a material impact on our consolidated financial position, results of operations or cash flows.

In addition, our Company is subject to extensive federal, state and local laws, regulations and ordinances in the U.S. and in other countries. These regulatory requirements relate to the use, generation, storage, handling, emission, transportation and discharge of certain hazardous materials, substances and waste into the environment.  The Company, including its KMG entities, manage Environmental, Health and Safety (“EHS”) matters related to protection of the environment and human health, the cleanup of contaminated sites, the treatment, storage and disposal of wastes, and the emission of substances into the air or waterways, among other EHS concerns.  Governmental authorities have the power to enforce compliance with their regulations, and violators may be subject to fines, injunctions or both. The Company devotes significant financial resources to compliance, including costs for ongoing compliance.

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Certain licenses, permits and product registrations are required for the Company’s products and operations in the U.S., Mexico and other countries in which it does business. The licenses, permits and product registrations are subject to revocation, modification and renewal by governmental authorities.  In the U.S.  in particular, producers and distributors of penta, which is a product manufactured and sold by KMG-Bernuth as part of the wood treatment business, are subject to registration and notification requirements under the Federal Insecticide, Fungicide and Rodenticide Act (“FIFRA”) and comparable state law in order to sell this product in the U.S. Compliance with these requirements may have a significant effect on our business, financial condition and results of operations.

We are subject to contingencies, including litigation relating to EHS laws and regulations, commercial disputes and other matters. Certain of these contingencies are discussed above and below. The ultimate resolution of these contingencies is subject to significant uncertainty, and should we fail to prevail in any of them or should several of them be resolved against us in the same reporting period, these matters could, individually or in the aggregate, be material to the consolidated financial statements. The ultimate outcome of these matters, however, cannot be determined at this time, nor can the amount of any potential loss be reasonably estimated, and as a result except where indicated no amounts have been recorded in our consolidated financial statements. The Company records legal costs associated with loss contingencies as expenses in the period in which they are incurred.

Refer to Note 17 of “Notes to the Consolidated Financial Statements” in Item 8 of Part II of our Annual Report on Form 10-K for the fiscal year ended September 30, 2018, for additional information regarding commitments and contingencies.

POSTRETIREMENT OBLIGATIONS IN FOREIGN JURISDICTIONS

We have defined benefit plans covering employees in certain foreign jurisdictions as required by local law, which are unfunded. We adopted ASU 2017-7 during the first quarter of the fiscal year and pursuant to the adoption, net service costs are recorded as fringe benefit expense under Cost of sales and Operating expenses, and all other costs are recorded in the Other income (expense), net in our Consolidated Statements of Income.  The projected benefit obligations and accumulated benefit obligations under all such unfunded plans are updated annually during the fourth quarter of the fiscal year. Benefit payments under all such unfunded plans to be paid over the next ten years are expected to be approximately $7,906.  For more information regarding these plans, refer to Note 17 of “Notes to the Consolidated Financial Statements” included in Item 8 of Part II of our Annual Report on Form 10-K for the fiscal year ended September 30, 2018.

PURCHASE OBLIGATIONS

Purchase obligations include take-or-pay arrangements with suppliers, and purchase orders and other obligations entered into in the normal course of business regarding the purchase of goods and services.  We have been operating under a fumed silica supply agreement with Cabot Corporation, our former parent company which is not a related party, the current term of which runs through December 2019.  As of June 30, 2019, purchase obligations include $8,859 of contractual commitments related to this agreement.

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13. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The table below summarizes the components of accumulated other comprehensive income (loss) (AOCI), net of tax provision/(benefit), as of June 30, 2019 and 2018:

	Foreign Currency Translation		Cash Flow Hedges			Pension and Other Postretirement Liabilities			Total
Balance at September 30, 2018	$	5,918	$	(17	)	$	(1,362	)	$	4,539
Foreign currency translation adjustment, net of tax of $564	4,132		—			—			4,132
Unrealized gain (loss) on cash flow hedges:
Change in fair value, net of tax of $(4,500)	—		(15,487		)	—			(15,487		)
Reclassification adjustment into earnings, net of tax of $(9)	—		(31		)	—			(31		)
Balance at June 30, 2019	$	10,050	$	(15,535	)	$	(1,362	)	$	(6,847	)

	Foreign Currency Translation		Cash Flow Hedges			Pension and Other Postretirement Liabilities			Available-for-Sale Securities			Total
Balance at September 30, 2017	$	5,239	$	46		$	(1,336	)	$	—		$	3,949
Foreign currency translation adjustment, net of tax of $(2,303)	2,276		—			—						2,276
Unrealized loss on available-for-sale securities, net of tax of $0	—		—			—			(48		)	(48		)
Unrealized gain (loss) on cash flow hedges:
Change in fair value, net of tax of $111	—		319			—						319
Reclassification adjustment into earnings, net of tax of $(133)	—		(382		)	—						(382		)
Balance at June 30, 2018	$	7,515	$	(17	)	$	(1,336	)	$	(48	)	$	6,114

The before tax amount reclassified from AOCI to net income during the three and nine months ended June 30, 2019 and 2018, related to cash flow hedges, were recorded as Interest expense on our Consolidated Statement of Income.

14. SHARE-BASED COMPENSATION PLANS

We issue share-based awards under the following programs: our Cabot Microelectronics Corporation 2012 Omnibus Incentive Plan, as amended effective March 7, 2017 (OIP); our Cabot Microelectronics Corporation 2007 Employee Stock Purchase Plan, as Amended and Restated January 1, 2010 (ESPP); and, pursuant to the OIP, our Directors' Deferred Compensation Plan, as amended September 23, 2008 (DDCP), and our 2001 Executive Officer Deposit Share Program (DSP).  In March 2017, our stockholders reapproved the material terms of performance-based awards under the OIP for purposes of complying with Section 162(m) of the Internal Revenue Code of 1986, as amended.  For additional information regarding these programs, refer to Note 12 of "Notes to the Consolidated Financial Statements" included in Item 8 of Part II of our Annual Report on Form 10-K for the fiscal year ended September 30, 2018. 

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We record share-based compensation expense for all share-based awards, including stock option grants, and restricted stock, restricted stock unit and performance share unit ("PSU") awards, and employee stock purchase plan purchases.  We calculate share-based compensation expense using the straight-line approach based on awards ultimately expected to vest, which requires the use of an estimated forfeiture rate.  Our estimated forfeiture rate is primarily based on historical experience, but may be revised in future periods if actual forfeitures differ from the estimate.  We use the Black-Scholes option-pricing model to estimate the grant date fair value of our stock options and employee stock purchase plan purchases.  This model requires the input of highly subjective assumptions, including the price volatility of the underlying stock, the expected term of our stock options, expected dividend yield and the risk-free interest rate.  We estimate the expected volatility of our stock options based on a combination of our stock's historical volatility and the implied volatilities from actively-traded options on our stock.  We calculate the expected term of our stock options using historical stock option exercise data, and for stock option grants made prior to December 2017, we have added a slight premium to this expected term for employees who meet the definition of retirement-eligible pursuant to their stock option grants during the contractual term of the grant.  As of December 2017, the provisions of stock option grants and restricted stock unit awards stated that, except in certain circumstances including termination for cause, once an employee meets the retirement eligibility requirements, any remaining unvested share-based awards will continue to vest regardless of termination of service. Consequently, the requisite service period for the award is satisfied upon retirement eligibility. Therefore, we record the total share-based compensation expense upon award for those employees who have met the retirement eligibility at the grant date. The expected dividend yield represents our annualized dividend in dollars divided by the stock price on the date of grant.  The risk-free interest rate is derived from the U.S. Treasury yield curve in effect at the time of grant.

The PSUs that have been awarded may be subject to downward or upward adjustment depending on the total shareholder return achieved by the Company during the particular performance period related to the PSUs, relative to the total shareholder return of an established market index.  We use a third-party service provider to estimate the fair value of the PSUs at grant date by using a Monte Carlo simulation model. This model simulates the stock price movements of the Company and Index constituents using certain assumptions, including the stock price of the Company and index constituents, the risk-free interest rate and stock price volatility.  Subsequent to the Acquisition, the performance metrics of the PSUs awarded in December 2017 were modified to reflect the performance results expected due to the Acquisition.

KMG awards granted subsequent to the entry into the definitive agreement for the Acquisition, but prior to the Acquisition Date, were converted to our restricted stock units (“Replacement Award”), with vesting in three equal installments on the first three anniversaries of the original award date. If the recipient is terminated without cause or resigns with good reason during the 18 months following the Acquisition Date, the Replacement Award will vest as of such termination date in a number of shares equal to 150% of the Replacement Award. The share-based compensation expense related to the Replacement Awards, including accelerated vesting, was $3,253 in the first quarter of fiscal 2019 and not material in the second and third quarters of fiscal 2019. The expense was included in the table below.

Share-based compensation expense for the three and nine months ended June 30, 2019 and 2018, was as follows:

	Three Months Ended June 30,						Nine Months Ended June 30,
	2019			2018			2019			2018
Cost of sales	$	540		$	542		$	2,169		$	1,896
Research, development and technical	390			445			1,733			1,491
Selling, general and administrative	2,410			3,199			11,146			10,882
Total share-based compensation expense	3,340			4,186			15,048			14,269
Tax benefit	(670		)	(1,023		)	(3,121		)	(3,272		)
Total share-based compensation expense, net of tax	$	2,670		$	3,163		11,927			$	10,997

For additional information regarding the estimation of fair value, refer to Note 12 of "Notes to the Consolidated Financial Statements" included in Item 8 of Part II of our Annual Report on Form 10-K for the fiscal year ended September 30, 2018.

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15. INCOME TAXES

The Company’s effective income tax rate was 52.1% and 36.9% for the three and nine months ended June 30, 2019, respectively, compared to an effective income tax rate of 18.3% and 47.0% for the three and nine months ended June 30, 2018, respectively. In the third quarter of fiscal 2019, the Company recorded a discrete charge of $9,128 related to newly issued final regulations related to U.S. Tax Reform which impacted the Company’s reserves for uncertain tax positions. Other factors that impacted the Company’s effective income tax rate for the nine months ended June 30, 2019 were primarily related to unfavorable tax treatment of certain KMG acquisition-related costs, such as compensation deduction limitations, as well as non-deductibility of certain professional fees.  Additionally, we recorded incremental tax expense for the Global Intangible Low Taxed Income (“GILTI”) provision of the Tax Act, which was effective for the first time during our fiscal 2019. Partially offsetting these adverse items, the Tax Act reduced the corporate income tax rate to 21.0% effective January 1, 2018, resulting in a change in our blended tax rate of 24.5% in fiscal 2018 to 21.0% beginning with our fiscal 2019.  In the quarter ended December 31, 2018, the Company completed its provisional estimates with regard to the Tax Act, and the Transition Tax and Withholding Tax obligations are now determined to be complete.

16. EARNINGS PER SHARE

Basic earnings per share (EPS) is calculated by dividing net income available to common stockholders by the weighted-average number of common shares outstanding during the period, excluding the effects of unvested restricted stock awards that have a right to receive non-forfeitable dividends, which are considered participating securities as prescribed by the two-class method under ASC 260 “Earnings per Share”.  Beginning in the first quarter of fiscal 2019, the amount of participating securities was no longer material and therefore, we have excluded such securities from our calculation of EPS in fiscal 2019.  Diluted EPS is calculated in a similar manner, but the weighted-average number of common shares outstanding during the period is increased to include the weighted-average dilutive effect of “in-the-money” stock options and unvested restricted stock shares using the treasury stock method.

The standards of accounting for earnings per share require companies to provide a reconciliation of the numerator and denominator of the basic and diluted earnings per share computations.  Basic and diluted earnings per share were calculated as follows:

	Three Months Ended June 30,					Nine Months Ended June 30,
	2019		2018			2019		2018
Numerator:
Net Income	$	18,878	$	35,171		$	59,458	$	61,825
Less: income attributable to participating securities	—		(34		)	—		(73		)
Earnings available to common shares	$	18,878	$	35,137		$	59,458	$	61,752
Denominator:
Weighted average common shares	29,063,907		25,611,505			28,398,960		25,479,078
(Denominator for basic calculation)
Weighted average effect of dilutive securities:
Share-based compensation	504,366		707,133			524,565		742,786
Diluted weighted average common shares	29,568,273		26,318,638			28,923,525		26,221,864
(Denominator for diluted calculation)
Earnings per share:
Basic	$	0.65	$	1.37		$	2.09	$	2.42
Diluted	$	0.64	$	1.34		$	2.06	$	2.35

Approximately 0.1 million and 0.2 million shares for the three and nine months ended June 30, 2019, respectively, and 0.1 million shares for both the three and nine months ended June 30, 2018, attributable to outstanding stock options were excluded from the calculation of diluted earnings per share.

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17. SEGMENT REPORTING

We identify our segments based on our management structure and the financial information used by our chief executive officer, who is our chief operating decision maker, to assess segment performance and allocate resources among our operating units.  We historically had operated predominantly in one industry segment – the development, manufacture and sale of Chemical Mechanical Planarization (CMP) consumables products.  In connection with the Acquisition, we reassessed our operating and reportable segments, and determined that we have the following two reportable segments:

Electronic Materials

Electronic Materials includes products and solutions for the semiconductor industry.  We manufacture and sell CMP consumables, including CMP slurries and polishing pad products, and high-purity process chemicals used to etch and clean silicon wafers in the production of semiconductors, photovoltaics (solar cells) and flat panel displays.

Performance Materials

Performance Materials includes pipeline performance products and services for energy industries, wood treatment products, and products and equipment used in the precision optics industry.

Beginning in fiscal 2019 and with the Acquisition, our chief operating decision maker evaluates segment performance based upon revenue and segment adjusted EBITDA.  Segment adjusted EBITDA is defined as earnings before interest, income taxes, depreciation and amortization, adjusted for certain items that affect comparability from period to period.  These adjustments include items related to the Acquisition, such as expenses incurred to complete the acquisition, integration-related expenses and impact of fair value adjustments to inventory acquired from KMG, and certain costs related to the KMG-Bernuth warehouse fire. We exclude these items from earnings when presenting our adjusted EBITDA measure because we believe they will be incurred infrequently and/or are otherwise not indicative of a segment's regular, ongoing operating performance. Adjusted EBITDA is also the basis of a performance metric for our fiscal 2019 Short-Term Incentive Program (STIP).  In addition, our chief operating decision maker does not use assets by segment to evaluate performance or allocate resources. Therefore, we do not disclose assets by segment.

Revenue from external customers and segment adjusted EBITDA were (in thousands):

	Three Months Ended June 30,				Nine Months Ended June 30,
	2019		2018		2019		2018
Segment Revenue
Electronic Materials	$	212,123	$	143,810	$	615,586	$	413,227
Performance Materials	59,759		6,627		143,465		20,167
Total	$	271,882	$	150,437	$	759,051	$	433,394

	Three Months Ended June 30,						Nine Months Ended June 30,
	2019			2018			2019			2018
Segment adjusted EBITDA:
Electronic Materials	$	70,859		$	57,460		$	220,594		$	162,641
Performance Materials	27,425			1,081			63,152			3,600
Unallocated corporate expenses	(12,527		)	(9,715		)	(35,621		)	(30,471		)
Interest expense	(12,757		)	(513		)	(32,978		)	(2,803		)
Interest income	417			1,141			2,004			3,248
Depreciation and amortization	(26,587		)	(6,410		)	(70,476		)	(19,527		)
Acquisition and integration related expenses	(2,910		)	—			(33,108		)	—
Charge for fair value write-up of acquired inventory sold	(42		)	—			(14,869		)	—
Costs related to KMG-Bernuth warehouse fire (See Note 12)	(4,450		)	—			(4,450		)	—
Income before income taxes	$	39,428		$	43,044		$	94,248		$	116,688

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We began to manage and report our results under the new organizational structure in conjunction with the Acquisition in fiscal 2019 and have reflected this change for all historical periods presented. Since the two segments operate independently and serve different markets and customers, there are no sales between segments.  Revenue from external customers and segment adjusted EBITDA shown for Performance Materials for the quarter ended June 30, 2018 includes Cabot Microelectronics’ heritage QED business.  The adjustments to segment EBITDA for the three and nine months ended June 30, 2019 represent addbacks of KMG acquisition and integration related expenses, and a charge for the write-up of inventory acquired from KMG to fair value, for inventory sold in the period, and costs related to KMG-Bernuth warehouse fire.  There were no adjustments to segment EBITDA for the three and nine months ended June 30, 2018.  Unallocated corporate expenses include expenses associated with executive leadership and public company costs, and the unallocated portions of corporate functions including finance, legal, human resources, information technology, and corporate development not directly attributable to a reportable segment.

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ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following "Management's Discussion and Analysis of Financial Condition and Results of Operations", as well as disclosures included elsewhere in this Report on Form 10-Q, include "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995.  This Act provides a safe harbor for forward-looking statements to encourage companies to provide prospective information about themselves so long as they identify these statements as forward-looking and provide meaningful cautionary statements identifying important factors that could cause actual results to differ from the projected results.  All statements other than statements of historical fact we make in this Report on Form 10-Q are forward-looking, which address a variety of subjects including, for example, future sales and operating results; growth or contraction, and trends in the industry and markets in which the Company participates; the acquisition of, investment in, or collaboration with other entities, including the Company’s acquisition of KMG Chemicals, Inc. (“KMG”), and the expected benefits and synergies of such acquisition; new product introductions; development of new products, technologies and markets; product performance; the financial conditions of the Company's customers; competitive landscape; the Company's supply chain; natural disasters; various economic or political factors and international or national events, including related to the enactment of trade sanctions, tariffs, or other similar matters; the generation, protection and acquisition of intellectual property, and litigation related to such intellectual property or third party intellectual property; environmental, health and safety laws and regulations, and related compliance; the operation of facilities by Cabot Microelectronics; the Company's management; foreign exchange fluctuation; the Company's current or future tax rate, including the effects of the Tax Cuts and Jobs Act in the United States (“tax act”); cybersecurity threats; financing facilities and related debt, pay off or payment of principal and interest, and compliance with covenants and other terms; and, uses and investment of the Company's cash balance, including dividends and share repurchases, which may be suspended, terminated or modified at any time for any reason by the Company, based on a variety of factors. Statements that are not historical facts, including statements about Cabot Microelectronics’ beliefs, plans and expectations, are forward-looking statements. Such statements are based on current expectations of Cabot Microelectronics’ management and are subject to a number of factors and uncertainties, which could cause actual results to differ materially from those described in the forward-looking statements. For information about factors that could cause actual results to differ materially from those described in the forward-looking statements, please refer to Cabot Microelectronics’ filings with the Securities and Exchange Commission (“SEC”), including the risk factors contained in Cabot Microelectronics’ Annual Report on Form 10-K and in this Report on Form 10-Q. Except as required by law, Cabot Microelectronics undertakes no obligation to update forward-looking statements made by it to reflect new information, subsequent events or circumstances. The section entitled "Risk Factors" describes some, but not all, of the factors that could cause these differences.

This section, "Management's Discussion and Analysis of Financial Condition and Results of Operations” (MD&A), should be read in conjunction with our Annual Report on Form 10-K for the fiscal year ended September 30, 2018, including the Consolidated Financial Statements and related notes thereto.

THIRD QUARTER OF FISCAL 2019 OVERVIEW

Cabot Microelectronics Corporation ("Cabot Microelectronics'', "the Company'', "us'', "we'', or "our'') is a leading global supplier of consumable materials to semiconductor manufacturers and pipeline companies.  As previously reported, on November 15, 2018 (“Acquisition Date”), we completed our acquisition of KMG Chemicals, Inc. (“KMG”), which produces and distributes specialty chemicals and performance materials for the semiconductor, pipeline operations and energy, and industrial wood preservation industries (“Acquisition”). The Acquisition has extended and strengthened our position as one of the leading suppliers of consumable materials to the semiconductor industry and has expanded our portfolio with the addition of KMG’s performance materials business, which enables us to be a leading global provider of performance products and services to the pipeline operations industry. The Consolidated Financial Statements included in this Report on Form 10-Q include the financial results of KMG from the Acquisition Date. Subsequent to the Acquisition, we operate our business within two reportable segments: Electronic Materials and Performance Materials. The Electronic Materials segment consists of our heritage CMP slurries and polishing pads businesses, as well as the recently-acquired KMG electronic chemicals business.  The Performance Materials segment includes KMG’s heritage pipeline performance and wood treatment businesses, and our heritage QED business. For additional information, refer to Part 1, Item 1, “Business”, in our Annual Report on Form 10-K for the fiscal year ended September 30, 2018.

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In the Electronic Materials segment, we recorded lower CMP slurries revenue, which was partially offset by higher revenue in CMP pads and electronic chemicals. Within the backdrop of an ongoing soft semiconductor industry environment, we believe these results are reflective of the resilience of our business, as well as the breadth of our product offerings, as the increased demand from advanced logic customers balanced weakness from memory customers. CMP slurries have a high participation to memory, and were adversely impacted by the decrease in DRAM and NAND production at our customers this year. In logic applications, the transition to advanced nodes by many of our top customers is driving increased demand for materials, particularly electronic chemicals. Despite continued semiconductor industry uncertainty in the near term, as channel inventories are reduced and demand from multiple end markets improves, we have seen signs of stabilization in demand from memory customers and expect recovery to continue over the next several quarters.

In our Performance Materials segment, we continue to record strong revenue this quarter, primarily driven by higher demand for our drag-reducing agents. These products enable pipeline operators to optimize the efficiency and throughput of oil transport in both U.S. and international oil production.

However, there are many factors that make it difficult for us to predict future revenue trends for our Company, including those discussed in Part II, Item 1A entitled “Risk Factors” of this Report on Form 10-Q.

Revenue for our third quarter of fiscal 2019 was $271.9 million, which represented an increase of 80.7% from the same quarter of fiscal 2018, primarily due to the Acquisition.

Net income was $18.9 million in the third quarter of fiscal 2019, which represented a decrease of 46.3% from the same quarter of fiscal 2018. Results benefited from the Acquisition, but were more than offset by acquisition-related expenses, increased amortization and depreciation associated with re-valuing KMG assets to fair value, higher interest expenses resulting from the debt borrowing to finance the Acquisition, costs related to the KMG-Bernuth warehouse fire that occurred in May 2019, and increased tax expense related to newly issued final regulations related to US Tax Reform which impacted our reserves for uncertain tax positions. For the same reasons, diluted earnings per share decrease from $1.34 in the third quarter of fiscal 2018 to $0.64 in the current quarter.  

Adjusted EBITDA was $85.8 million in the third quarter of fiscal 2019.  This represents an increase of $36.9 million, or a 75.6% increase from the same quarter of fiscal 2018.  Adjusted EBITDA benefited from the addition of the KMG businesses, partially offset by the softer industry conditions that resulted in lower demand for Cabot Microelectronics’ heritage CMP products. Refer to the “Use of certain GAAP and Non-GAAP Financial Information” section below for the definition of adjusted EBITDA and a reconciliation of adjusted EBITDA to net income, the most comparable GAAP financial measure. Adjusted EBITDA margin, which represents adjusted EBITDA as a percentage of revenue, was 31.5% for the third quarter of fiscal 2019, compared to 32.5% for the same quarter of fiscal 2018.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES AND EFFECTS OF RECENT ACCOUNTING PRONOUNCEMENTS

We discuss our critical accounting estimates and effects of recent accounting pronouncements in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in Item 7 of Part II of our Annual Report on Form 10-K for the fiscal year ended September 30, 2018.   Except for the discussion on revenue recognition in Note 2 of the Notes to the Consolidated Financial Statements of this Report on Form 10-Q, no material changes have been made to the Company’s significant accounting policies during the first nine months of fiscal 2019. See Note 2 of the Notes to the Consolidated Financial Statements of this Report on Form 10-Q for a discussion of new accounting pronouncements.

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RESULTS OF OPERATIONS

THREE MONTHS ENDED JUNE 30, 2019, VERSUS THREE MONTHS ENDED JUNE 30, 2018

REVENUE

Revenue was $271.9 million for the three months ended June 30, 2019, which represented an 80.7%, or $121.4 million, increase from the three months ended June 30, 2018, primarily due to the Acquisition. Revenue from Cabot Microelectronics’ heritage businesses decreased by $10.1 million, or 6.7%, primarily due to lower sales volume, partially offset by a higher value product mix.

COST OF SALES

Total cost of sales was $156.5 million for the three months ended June 30, 2019, which represented an increase of 124.4%, or $86.8 million, from the three months ended June 30, 2018, primarily due to the Acquisition. The cost of sales from Cabot Microelectronics’ heritage businesses decreased by $3.8 million, primarily driven by lower sales volume.

GROSS MARGIN

Our gross margin was 42.4% for the three months ended June 30, 2019, compared to 53.6% for the three months ended June 30, 2018.  The decrease in gross margin was primarily due to the inclusion of the KMG businesses, which reduced gross margin by 10.7%, of which 1.5% was due to the costs related to the KMG-Bernuth warehouse fire. Within Cabot Microelectronics’ heritage businesses, gross margin decreased by 0.5%, which was primarily due to lower sales volume, partially offset by a higher value product mix.

RESEARCH, DEVELOPMENT AND TECHNICAL

Total research, development and technical expenses were $12.2 million for the three months ended June 30, 2019, which represented a decrease of 6.6%, or $0.9 million, from the three months ended June 30, 2018.  The decrease was primarily due to lower staffing-related costs of $1.1 million, including incentive compensation costs, offset by higher supplies used in research and development of $0.4 million.

Our research, development and technical efforts are focused on the areas of research related to fundamental CMP technology; development of new and enhanced CMP consumable products, including collaboration on joint development projects with technology-leading customers and suppliers; process development to support rapid and effective commercialization of new products; technical support of CMP products in our customers’ research, development and manufacturing facilities; and, development of polishing and metrology applications outside of the semiconductor industry.

SELLING, GENERAL AND ADMINISTRATIVE

Selling, general and administrative expenses were $51.0 million for the three months ended June 30, 2019, which represented an increase of 98.2%, or $25.2 million, from the three months ended June 30, 2018.  The increase was primarily due to $13.0 million of amortization expense related to the Acquisition, $11.2 million in incremental KMG-related costs, and $2.9 million of acquisition and integration related costs. These items were partially offset by $1.6 million lower staffing-related costs, including incentive compensation costs.

INTEREST EXPENSE

Interest expense was $12.8 million for the three months ended June 30, 2019, which represented an increase of $12.2 million from the three months ended June 30, 2018.  The increase resulted from the debt borrowing to finance the Acquisition.

INTEREST INCOME

Interest income was $0.4 million for the three months ended June 30, 2019, which represented a decrease of 63.5%, or $0.7 million from the three months ended June 30, 2018 due to lower cash balances compared to the same period last year.

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OTHER INCOME (EXPENSE), NET

Other expense was $0.5 million for three months ended June 30, 2019, compared to other income of $0.5 million from the three months ended June 30, 2018. The change was primarily due to higher loss on foreign exchange in the current quarter and the absence of the gain on termination of interest rate swap agreements of $0.5 million that had occurred in the third quarter of fiscal 2018.

PROVISION FOR INCOME TAXES

The Company’s effective income tax rate for the third quarter of fiscal 2019 was 52.1%, compared to 18.3% in the same quarter last year.   The increase is primarily driven by a discrete charge of $9,128 related to newly issued final regulations related to U.S. Tax Reform which impacted the Company’s reserves for uncertain tax positions.

NET INCOME

Net income was $18.9 million for the three months ended June 30, 2019, which represented a decrease of 46.3%, or $16.3 million, from the three months ended June 30, 2018.  Net income benefited from the addition of the KMG businesses, and was partially offset by acquisition and integration-related expenses, increased amortization and depreciation associated with re-valuing KMG assets to fair value, higher interest expenses resulting from the debt borrowing to finance the Acquisition, KMG-Bernuth warehouse fire related costs, and discrete charge of $9,128 related to newly issued final regulations related to U.S. Tax Reform which impacted the Company’s reserves for uncertain tax positions.

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NINE MONTHS ENDED JUNE 30, 2019, VERSUS NINE MONTHS ENDED JUNE 30, 2018

REVENUE

Revenue was $759.1 million for the nine months ended June 30, 2019, which represented a 75.1%, or $325.7 million increase from the nine months ended June 30, 2018.  The increase in revenue was primarily due to the Acquisition. Revenue from Cabot Microelectronics’ heritage businesses increased slightly by $9.0 million, or 2.1%. This increase was primarily driven by a higher value product mix, selected price increases, partially offset by lower sales volume.

COST OF SALES

Total cost of sales was $429.5 million for the nine months ended June 30, 2019, which represented an increase of 110.9%, or $225.9 million, from the nine months ended June 30, 2018.  The increase in cost of sales was primarily due to the Acquisition. Cost of sales of Cabot Microelectronics’ heritage businesses was relatively flat compared to the same period last year, as the lower costs associated with lower sales volume was offset by higher per unit costs.

GROSS MARGIN

Our gross margin was 43.4% for the nine months ended June 30, 2019, compared to 53.0% for the nine months ended June 30, 2018.  The gross margin was adversely impacted by the inclusion of the KMG businesses, which reduced gross margin by 11.2%, of which 2.0% was due to the impact of the fair value write-up of acquired inventory sold. Excluding the KMG businesses, gross margin increased by 1.6%, which was primarily due to lower production cost and a higher value product mix, partially offset by lower sales volume.

RESEARCH, DEVELOPMENT AND TECHNICAL

Total research, development and technical expenses were $39.0 million for nine months ended June 30, 2019, which was relatively flat compared to the same period last year.

SELLING, GENERAL AND ADMINISTRATIVE

Selling, general and administrative expenses were $162.4 million for the nine months ended June 30, 2019, which represented an increase of 116.4%, or $87.4 million, from the nine months ended June 30, 2018.  The increase was primarily due to $33.1 million of acquisition and integration related costs, $32.5 million of amortization expense related to the Acquisition, and $27.1 million in incremental KMG-related costs associated with the post-Acquisition period during the nine months period.  These items were partially offset by the absence of executive officer transition costs of $4.2 million that occurred in the first quarter of fiscal 2018.

INTEREST EXPENSE

Interest expense was $33.0 million for the nine months ended June 30, 2019, which represented an increase of $30.2 million from the nine months ended June 30, 2018.  The increase resulted from the debt borrowing to finance the Acquisition.

INTEREST INCOME

Interest income was $2.0 million for the nine months ended June 30, 2019, which represented a decrease of 38.3%, or $1.2 million for the nine months ended June 30, 2018 due to lower cash balances.

OTHER INCOME (EXPENSE), NET

Other expense was $2.9 million for the nine months ended June 30, 2019, compared to other income of $0.1 million from the nine months ended June 30, 2018. The change was primarily due to higher loss on foreign exchange, and the absence of the gain on sale of assets of $1.0 million and gain on the termination of interest rate swap agreements that occurred in the nine months ended June 30, 2018.

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PROVISION FOR INCOME TAXES

The Company’s effective income tax rate was 36.9% for the nine months ended June 30, 2019, compared to 47.0% for the nine months ended June 30, 2018.  The decrease in our effective income tax rate for the nine months ended June 30, 2019 compared to the prior year is primarily attributable to the Tax Act enacted in December 2017 which reduced the corporate income tax rate to 21.0% effective January 1, 2018, resulting in a change in our blended tax rate of 24.5% in fiscal 2018 to 21.0% beginning with our fiscal 2019. This is partially offset by the increased tax expense related to newly issued final regulations related to US Tax Reform which impacted our reserves for uncertain tax positions, unfavorable tax treatment of certain KMG acquisition-related costs, such as compensation deduction limitations, as well as non-deductibility of certain professional fees.  Additionally, we recorded incremental tax expense for the GILTI provision of the Tax Act, which was effective for the first time during our fiscal 2019. See Note 15 of the Notes to the Consolidated Financial Statements of this Report on Form 10-Q for more information on our income taxes.

NET INCOME

Net income was $59.5 million for the nine months ended June 30, 2019, which represented a decrease of 3.8%, or $2.4 million, from the nine months ended June 30, 2018.  Net income benefited from the addition of the KMG businesses, and the absence of the adverse impact of the Tax Act in the first quarter of fiscal 2018. Net income was partially offset by acquisition and integration-related expenses, a charge for fair value write-up of acquired inventory sold, increased amortization and depreciation associated with re-valuing KMG assets to fair value, higher interest expenses resulting from the debt borrowing to finance the Acquisition, and the increased tax expense related to newly issued final regulations related to US Tax Reform which impacted our reserves for uncertain tax positions.

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SEGMENT ANALYSIS

Segment data is presented for our two reportable segments for the three and nine months ended June 30, 2019 and 2018. The segment data should be read in conjunction with our consolidated financial statements and related notes included elsewhere in this Report on Form 10-Q.

Revenue, adjusted EBITDA and adjusted EBITDA margin by segment were (in thousands except for percentages):

	Three Months Ended June 30,				Nine Months Ended June 30,
	2019		2018		2019		2018
Segment Revenue
Electronic Materials	$	212,123	$	143,810	$	615,585	$	413,227
Performance Materials	59,759		6,627		143,466		20,167
Total	$	271,882	$	150,437	$	759,051	$	433,394

	Three Months Ended June 30,						Nine Months Ended June 30,
	2019			2018			2019			2018
Segment Adjusted EBITDA
Electronic Materials	$	70,859		$	57,460		$	220,594		$	162,641
Performance Materials	27,425			1,081			63,152			3,600
Unallocated Corporate Expenses	(12,527		)	(9,715		)	(35,621		)	(30,471		)
Total	$	85,757		$	48,826		$	248,125		$	135,770

	Three Months Ended June 30,				Nine Months Ended June 30,
	2019		2018		2019		2018
Adjusted EBITDA margin
Electronic Materials	33.4	%	40.0	%	35.8	%	39.4	%
Performance Materials	45.9	%	16.3	%	44.0	%	17.8	%

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THREE MONTHS ENDED JUNE 30, 2019, VERSUS THREE MONTHS ENDED JUNE 30, 2018

ELECTRONIC MATERIALS

The $68.3 million increase in Electronic Materials revenue was driven by the addition of KMG’s electronic chemicals business in the quarter, partially offset by the decrease in the sale of Cabot Microelectronics’ heritage CMP slurries products primarily due to softer industry conditions that resulted in lower demand for the Company’s products. The decrease in sales volume was partially offset by higher value product mix and price changes.  The increase in Electronic Materials adjusted EBITDA compared to prior year was driven by the addition of KMG’s electronic chemicals results. The lower adjusted EBITDA margin was primarily due to change in mix of products, as a result of the Acquisition.

PERFORMANCE MATERIALS

The $53.1 million increase in Performance Materials revenue was primarily driven by the addition of KMG’s performance materials business in the quarter.  Performance Materials’ adjusted EBITDA and adjusted EBITDA margin expanded from the prior year due to the addition of KMG’s heritage performance materials business.

NINE MONTHS ENDED JUNE 30, 2019, VERSUS NINE MONTHS ENDED JUNE 30, 2018

ELECTRONIC MATERIALS

The $202.4 million increase in Electronic Materials revenue was driven by the addition of KMG’s electronic chemicals business since the Acquisition.  The remaining increase was driven by higher value product mix, strong organic demand for the Company’s heritage CMP polishing pads product line, which increased 11.1%, primarily on higher sales volume, partially offset by the decrease in Company's heritage CMP slurries products due to the softer industry conditions. Electronic Materials adjusted EBITDA increased from the prior year driven by the addition of KMG’s electronic chemicals results, as well as stronger profitability, driven by the leverage achieved on higher sales volume of the Company’s heritage CMP polishing pads product line.  The lower adjusted EBITDA margin was primarily due to change in mix of products as a result of the Acquisition.

PERFORMANCE MATERIALS

The $123.3 million increase in Performance Materials revenue was primarily driven by the addition of KMG’s performance materials business post-Acquisition.  Performance Materials’ adjusted EBITDA and adjusted EBITDA margin expanded from the prior year due to the addition of KMG’s heritage performance materials business.

USE OF CERTAIN GAAP AND NON-GAAP FINANCIAL INFORMATION

We provide certain non-GAAP financial information, such as adjusted EBITDA and adjusted EBITDA margin, to complement reported GAAP results because we believe that analysis of our financial performance is enhanced by an understanding of these non-GAAP financial measures.  We exclude certain items from earnings when presenting our adjusted EBITDA measure because we believe they will be incurred infrequently and/or are otherwise not indicative of a segment's regular, ongoing operating performance.  Accordingly, we believe that they aid in evaluating the underlying operational performance of our business, and facilitate comparisons between periods. In addition, adjusted EBITDA is used as a basis of the performance metric for our fiscal 2019 Short-Term Incentive Program (STIP).  A similar EBITDA calculation is also used by our lenders for a key debt compliance ratio.

Adjusted EBITDA margin is defined as adjusted EBITDA as a percentage of revenue. Adjusted EBITDA is defined as earnings before interest, income taxes, depreciation and amortization, adjusted for certain items that affect comparability from period to period.  These adjustments include items related to our acquisition of KMG, such as expenses incurred to complete the acquisition, integration related expenses, and impact of fair value adjustments to inventory acquired from KMG.

The non-GAAP financial information provided is a supplement to, and not a substitute for, the Company’s financial results presented in accordance with U.S. GAAP. Management strongly encourages investors to review the Company’s consolidated financial statements in their entirety and to not rely on any single financial measure. These non-GAAP financial measures are provided to enhance the investor's understanding about the Company's ongoing operations. Specifically, the Company believes the impact of KMG acquisition-related expenses and acquisition-related amortization expenses are not indicative of its core operating results, and thus presents these certain metrics excluding these effects. The presentation of non-GAAP financial information is not meant to be considered in isolation or as a substitute for results prepared and presented in accordance with U.S. GAAP. A reconciliation table of GAAP to non-GAAP financial measures is contained below.

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Adjusted EBITDA for the Electronic Materials and Performance Materials segments is presented in conformity with Accounting Standards Codification Topic 280, Segment Reporting. This measure is reported to the chief operating decision maker for purposes of making decisions about allocating resources to the segments and assessing their performance. For these reasons, this measure is excluded from the definition of non-GAAP financial measures under the SEC Regulation G and Item 10(e) of Regulation S-K.

RECONCILIATION OF NET INCOME TO ADJUSTED EBITDA

The table below presents the reconciliation of net income to adjusted EBITDA. Adjusted EBITDA is not a measurement of our financial performance under GAAP and should not be considered as an alternative to net income. Adjusted EBITDA may have limitations as an analytical tool and should not be considered in isolation or as a substitute for analysis of our results as reported under GAAP.

	Three Months Ended June 30,						Nine Months Ended June 30,
	2019			2018			2019			2018
Segment adjusted EBITDA
Electronic Materials	$	70,859		$	57,460		$	220,594		$	162,641
Performance Materials	27,425			1,081			63,152			3,600
Unallocated Corporate Expenses	(12,527		)	(9,715		)	(35,621		)	(30,471		)
Total	$	85,757		$	48,826		$	248,125		$	135,770

	Three Months Ended June 30,						Nine Months Ended June 30,
	2019			2018			2019			2018
Net income	$	18,878		$	35,171		$	59,458		$	61,825
Interest expense	12,757			513			32,978			2,803
Interest income	(417		)	(1,141		)	(2,004		)	(3,248		)
Income taxes	20,550			7,873			34,790			54,863
Depreciation and amortization	26,587			6,410			70,476			19,548
EBITDA	78,355			48,826			195,698			135,791
Acquisition and integration related expenses	2,910			—			33,108			—
Charge for fair value write-up of acquired inventory sold	42			—			14,869			—
Costs related to KMG-Bernuth warehouse fire	4,450			—			4,450			—
Adjusted EBITDA	$	85,757		$	48,826		$	248,125		$	135,791

LIQUIDITY AND CAPITAL RESOURCES

We generated $117.0 million in cash flows from operating activities in the first nine months of fiscal 2019, compared to $104.0 million in cash from operating activities in the first nine months of fiscal 2018.  The increase in operating cash flows of $13.0 million was due to an increase of net income adjusted for non-cash reconciling items.

In the first nine months of fiscal 2019, cash flows used in investing activities were $1.2 billion, compared to $145.3 million in cash used in investing activities in the first nine months of fiscal 2018.  The increase was driven by the use of $1,182 million for the Acquisition. The remainder of the purchase price was satisfied with the issuance of common stock.  Capital expenditures in the first nine months were $32.7 million, compared to $15.2 million in the prior year.

In the first nine months of fiscal 2019, cash flows provided by financing activities were $908.7 million, compared to $177.7 million used in financing activities in the first nine months of fiscal 2018.  During the first quarter of fiscal 2019, we received $1,044 million in debt proceeds, net of $21.4 million in debt issuance costs and original issue discount fees, which was used for the Acquisition. In addition, our dividend payments increased by $13.6 million versus the prior year, driven by the doubling of our quarterly dividend, as announced in March 2018, and the new shares issued in connection with the Acquisition.

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On the Acquisition Date, we entered into a credit agreement by and among the Company, the lenders party thereto and JPMorgan Chase Bank, N.A., as administrative agent (the “Credit Agreement”), which provides for senior secured financing of up to $1,265.0 million, consisting of a term loan facility in an aggregate principal amount of $1,065.0 million (the “Term Loan Facility”) and a revolving credit facility in an aggregate principal amount of up to $200.0 million, including a letter of credit sub-facility of up to $50.0 million (the “Revolving Credit Facility”).  The Term Loan Facility and the Revolving Credit Facility are referred to as the “Credit Facilities.” The Company may generally prepay outstanding loans under the Credit Facilities at any time, without prepayment premium or penalty, subject to customary “breakage” costs with respect to LIBOR rate loans. We made a prepayment of $55 million and a total prepayment of $100.0 million during the three and nine months ended June 30, 2019, respectively. The Revolving Credit Facility requires that the Company maintain a maximum first lien secured net leverage ratio, as defined in the Credit Agreement, of 4.00 to 1.00 as of the last day of each fiscal quarter if any revolving loans are outstanding, commencing with the first full fiscal quarter after the Acquisition Date. Additionally, the Credit Agreement contains certain affirmative and negative covenants that limit the ability of the Company, among other things and subject to certain significant exceptions, to incur debt or liens, make investments, enter into certain mergers, consolidations, asset sales and acquisitions, pay dividends and make other restricted payments and enter into transactions with affiliates. The Credit Agreement also contains customary affirmative covenants and events of default. We believe we are in compliance with these covenants. In the second quarter of fiscal 2019, we entered into a floating-to-fixed interest rate swap agreement to hedge the variability in our LIBOR-based interest payments on approximately 70% of our Team Loan balance. See Note 10 of the Notes to the Consolidated Financial Statements of this Report on Form 10-Q for additional information regarding the Credit Agreement.

In January 2016, our Board of Directors authorized an increase in the amount available under our share repurchase program from the previously remaining $75.0 million to $150.0 million. As of June 30, 2019, $76.3 million remained available under our share repurchase program. Share repurchases are made from time to time, depending on market and other conditions. The timing, manner, price and amounts of repurchases are determined at the Company's discretion, and the share repurchase program may be suspended, terminated or modified at any time for any reason. The repurchase program does not obligate the Company to acquire any specific number of shares. Repurchases are subject to SEC regulations as well as certain conditions specified in the plan.

Our Board of Directors authorized the initiation of our regular quarterly cash dividend program in January 2016, and since that time has increased the dividend, to its current quarterly level of $0.42 per share. The declaration and payment of future dividends is subject to the discretion and determination of the Board of Directors and management, based on a variety of factors, and the program may be suspended, terminated or modified at any time for any reason.

As of June 30, 2019, we had $168.7 million of cash and cash equivalents, $118.4 million of which was held in foreign subsidiaries.  See Part II, Item 1A entitled “Risk Factors” of this Report on Form 10-Q for additional discussion of our foreign operations.

We believe that our current balance of cash, cash generated by our operations, cash repatriation to the United States, and available borrowing capacity under our Credit Facilities will be sufficient to fund our operations, expected capital expenditures, dividend payments, and share repurchases for at least the next twelve months. However, in pursuit of corporate development or other initiatives, we may need to raise additional funds in the future through equity or debt financing, or other arrangements.  Depending on future conditions in the capital and credit markets, we could encounter difficulty securing additional financing in the type or amount necessary to pursue these objectives.

OFF-BALANCE SHEET ARRANGEMENTS

At June 30, 2019 and September 30, 2018, we did not have any unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities, which might have been established for the purpose of facilitating off-balance sheet arrangements.

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TABULAR DISCLOSURE OF CONTRACTUAL OBLIGATIONS

The following summarizes our contractual obligations at June 30, 2019, and the effect such obligations are expected to have on our liquidity and cash flows in future periods.

CONTRACTUAL OBLIGATIONS			Less Than		1-3		3-5		After 5
(In millions)	Total		1 Year		Years		Years		Years
Purchase obligations	$	63.3	$	60.2	$	3.1	$	—	$	—
Operating leases	33.9		7.1		8.2		6.8		11.8
Severance agreements	3.1		3.1		—		—		—
Debt	962.3		13.3		21.3		21.3		906.4
Interest expense and fees	235.3		49.0		71.8		66.7		47.8
Other long-term liabilities *	26.8		0.5		0.8		0.7		24.8
Total contractual obligations	$	1,324.7	$	133.2	$	105.2	$	95.5	$	990.8

* We have excluded $145 million in deferred tax liabilities from the other long-term liability amounts presented, as the amount and timing of payments to be settled in cash are not known.   We have also excluded $15.8 million related to the fair value of our interest rate swap, and $1.0 million in deferred rent as the rent payments are included in the table above under the caption “Operating leases.”

We have been operating under a multi-year supply agreement with Cabot Corporation, which has not been a related party since 2002, for the purchase of fumed silica, the current term of which runs through December 31, 2019.  Purchase obligations include an aggregate amount of $8.9 million of contractual commitments related to this agreement.

Interest payments on long-term debt reflect interest rates in effect at December 31, 2018. The interest payments reflect variable LIBOR-based rates currently in effect on $216.3 million of our outstanding debt, and fixed rates on $746 million of outstanding debt for which we have implemented an interest rate swap. Commitment fees are based on our estimated consolidated leverage ratio in future periods. See Note 10 of the Notes to the Consolidated Financial Statements of this Report on Form 10-Q for additional information regarding our long-term debt.

Refer to Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations” of Part II of our Annual Report on Form 10-K for the fiscal year ended September 30, 2018, for additional information regarding our contractual obligations.

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SUPPLEMENTAL UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

The following Unaudited Pro Forma Condensed Combined Financial Information is presented to illustrate the estimated effects of the company’s acquisition of KMG (the “Acquisition”), which was consummated on November 15, 2018 (the “Acquisition Date”), based on the historical results of operations of Cabot Microelectronics and KMG. See Note 1, Background and Basis of Presentation, and Note 4, Business Combination, to the consolidated financial statements for additional information on the Acquisition. The following Unaudited Pro Forma Condensed Combined Statements of Income for the three and nine months ended June 30, 2019 and 2018 are based on the historical financial statements of Cabot Microelectronics and KMG after giving effect to the Acquisition, and the assumptions and adjustments described in the accompanying notes to these Unaudited Pro Forma Condensed Combined Statements of Income.

The historical Cabot Microelectronics Consolidated Statements of Income for the three and nine months ended June 30, 2019 and 2018 were derived from the consolidated financial statements included elsewhere in this Form 10-Q. The historical KMG Consolidated Statements of Income for the nine months ended June 30, 2019, as well as the historical KMG Consolidated Statements of Income for the three and nine months ended June 30, 2018 includes information derived from KMG’s books and records. Prior to the Acquisition, KMG was on a July 31st fiscal year end reporting cycle. These pro forma financials include actual KMG’s pre-Acquisition results with the months aligned to Cabot Microelectronics’ fiscal periods, and therefore, they do not align with consolidated financial statements included in KMG’s Quarterly Reports on Form 10-Q.

The Unaudited Pro Forma Condensed Combined Statements of Income are presented as if the Acquisition had been consummated on October 1, 2017, the first business day of our 2018 fiscal year, and combine the historical results of Cabot Microelectronics and KMG, which is consistent with internal management reporting, after primarily giving effect to the following assumptions and adjustments:

• Application of the acquisition method of accounting;

• Elimination of transaction costs incurred in connection with the Acquisition;

• Adjustments to reflect the new financing arrangements entered into and legacy financing arrangements retired in connection with the Acquisition;

• The exchange of 0.2000 share(s) of Cabot Microelectronics common stock for each share of KMG common stock; and

• Conformance of accounting policies.

The Unaudited Pro Forma Condensed Combined Financial Information was prepared using the acquisition method of accounting, which requires, among other things, that assets acquired and liabilities assumed in a business combination be recognized at their fair values as of the completion of the acquisition. We utilized estimated fair values at the Acquisition Date to allocate the total consideration exchanged to the net tangible and intangible assets acquired and liabilities assumed. This allocation was initially completed as of November 15, 2018.  The allocation may be adjusted for up to one-year post closing.

The Unaudited Pro Forma Condensed Combined financial information has been prepared on the basis of SEC Regulation S-X Article 11 and is not necessarily indicative of the results of operations that would have been realized had the transactions been completed as of the dates indicated, nor are they meant to be indicative of our anticipated combined future results. In addition, the accompanying Unaudited Pro Forma Condensed Combined Statements of Income do not reflect any additional anticipated synergies, operating efficiencies, cost savings, or any integration costs that may result from the Acquisition.

The historical consolidated financial information has been adjusted in the accompanying Unaudited Pro Forma Condensed Combined Statements of Income to give effect to unaudited pro forma events that are (1) directly attributable to the transaction, (2) factually supportable and (3) are expected to have a continuing impact on the results of operations of the combined company. As a result, under SEC Regulation S-X Article 11, certain non-recurring expenses such as deal costs and compensation expenses related to severance or accelerated stock compensation and certain non-cash costs related to the fair value step-up of inventory are eliminated from pro forma results in the periods presented. Certain recurring historical KMG expenses related to depreciation, amortization, financing costs and costs of sales have been adjusted as if the Acquisition had occurred on October 1, 2017.

In contrast, under the ASC 805 presentation in Note 4, Business Combination, to the consolidated financial statements, these expenses are required to be included in prior year pro forma results.

The Unaudited Pro Forma Condensed Combined Financial Information, including the related notes included herein, should be read in conjunction with Cabot Microelectronics’ Current Report on Form 8-K/A filed on January 30, 2019, as well as our consolidated financial statements included in this Form 10-Q and the historical consolidated financial statements and related notes of Cabot Microelectronics and KMG, which are available to the public at the SEC’s website at www.sec.gov.

41

CABOT MICROELECTRONICS CORPORATION

Unaudited Pro Forma Condensed Combined Statement of Income

For the Three and Nine Months Ended June 30, 2019 and June 30, 2018

(in thousands, except per share data)

	Three Months Ended June 30,					Nine Months Ended June 30,
	2019			2018		2019			2018
Revenue	$	271,882		$	272,589	$	821,029		$	784,694
Cost of sales	156,450			152,414		457,372			443,059
Gross profit	115,432			120,175		363,657			341,635
Operating expenses:
Research, development and technical	12,191			13,059		39,009			38,578
Selling, general and administrative expenses	54,655			53,024		166,189			155,695
Total operating expenses	66,846			66,083		205,198			194,273
Operating income	48,586			54,092		158,459			147,362
Interest expense	12,759			13,350		38,372			41,391
Interest income	417			1,150		2,055			3,260
Other income (expense), net	(472		)	396		(3,155		)	(890		)
Income before income taxes	35,772			42,288		118,987			108,341
Provision for income taxes	19,695			7,585		30,049			37,462
Net income	$	16,077		$	34,703	$	88,938		$	70,879
Basic earnings per share	$	0.55		$	1.20	$	3.07		$	2.47
Weighted average basic shares outstanding	29,064			28,849		28,944			28,716
Diluted earnings per share	$	0.54		$	1.17	$	3.02		$	2.41
Weighted average diluted shares outstanding	29,568			29,556		29,469			29,459

42

CABOT MICROELECTRONICS CORPORATION

Unaudited Pro Forma Condensed Combined Statement of Income

For the Three Months Ended June 30, 2019

(in thousands, except per share data)

	Cabot Microelectronics
	Three Months Ended June 30, 2019			Pro Forma Adjustments (1)			Pro Forma Combined
Revenue	$	271,882		$	—		$	271,882
Cost of sales	156,492			(42		)	156,450
Gross profit	115,390			42			115,432
Operating expenses:
Research, development and technical	12,191			—			12,191
Selling, general and administrative expenses	50,959			3,696			54,655
Total operating expenses	63,150			3,696			66,846
Operating income	52,240			(3,654		)	48,586
Interest expense	12,757			2			12,759
Interest income	417			—			417
Other income (expense), net	(472		)	—			(472		)
Income before income taxes	39,428			(3,656		)	35,772
Provision for income taxes	20,550			(855		)	19,695
Net income	$	18,878		$	(2,801	)	$	16,077
Basic earnings per share	$	0.65					$	0.55
Weighted average basic shares outstanding	29,064						29,064
Diluted earnings per share	$	0.64					$	0.54
Weighted average diluted shares outstanding	29,568						29,568

¹ Pro forma adjustments are related to non-recurring items directly attributable to the transaction as well as recurring differences related to amortization or financing costs that were included as if the companies were combined as of October 1, 2017.

43

CABOT MICROELECTRONICS CORPORATION

Unaudited Pro Forma Condensed Combined Statement of Income

For the Nine Months Ended June 30, 2019

(in thousands, except per share data)

	Cabot Microelectronics (1)			KMG Chemicals (2)
	Nine Months Ended June 30, 2019			October 1, 2018 to November 14, 2018			Presentation Reclassification (3)			Pro Forma Adjustments (4)			Pro Forma Combined
Revenue	$	759,051		$	61,978		$	—		$	—		$	821,029
Cost of sales	429,508			36,534			4,741			(13,411		)	457,372
Gross profit	329,543			25,444			(4,741		)	13,411			363,657
Operating expenses:
Distribution expenses	—			4,741			(4,741		)	—			—
Research, development and technical	39,009			—			—			—			39,009
Selling, general and administrative expenses	162,415			40,504			—			(36,730		)	166,189
Amortization of intangibles	—			1,943			—			(1,943		)	—
Total operating expenses	201,424			47,188			(4,741		)	(38,673		)	205,198
Operating income	128,119			(21,744		)	—			52,084			158,459
Interest expense	32,978			8,537			—			(3,143		)	38,372
Interest income	2,004			51			—			—			2,055
Derivative fair value gain	—			567			—			(567		)	—
Other income (expense), net	(2,897		)	(258		)	—			—			(3,155		)
Income before income taxes	94,248			(29,921		)	—			54,660			118,987
Provision for income taxes (benefit)	34,790			(6,847		)	—			2,106			30,049
Net income	$	59,458		$	(23,074	)	$	—		$	52,554		$	88,938
Basic earnings per share	$	2.09											$	3.07
Weighted average basic shares outstanding	28,399												28,944
Diluted earnings per share	$	2.06											$	3.02
Weighted average diluted shares outstanding	28,924												29,469

¹ Includes heritage Cabot Microelectronics from October 1, 2018 to June 30, 2019 and heritage KMG from November 15, 2018 to June 30, 2019. On November 15, 2018, the Acquisition was completed and actual combined company results are included.

² Heritage KMG results that occurred prior to the Acquisition on November 15, 2018.

³ Represents the reclassification of KMG distribution expenses from operating expenses to cost of sales, in order to conform with Cabot Microelectronics’ accounting policies.

⁴ Certain pro forma adjustments related to depreciation, amortization, financing costs and costs of sales have been made for the October 1, 2018 to June 30, 2019 period assuming that the Acquisition occurred on October 1, 2017. Additionally, nonrecurring pro forma adjustments have been made for deal costs, compensation expenses related to severance or accelerated stock compensation, and the fair value step-up of inventory directly attributable throughout the nine-month period.

44

CABOT MICROELECTRONICS CORPORATION

Unaudited Pro Forma Condensed Combined Statement of Income

For the Three Months Ended June 30, 2018

(in thousands, except per share data)

	Cabot Microelectronics		KMG Chemicals (1)
	Three Months Ended June 30, 2018		Three Months Ended June 30, 2018			Presentation Reclassification (2)			Pro Forma Adjustments (3)			Pro Forma Combined
Revenue	$	150,437	$	122,152		$	—		$	—		$	272,589
Cost of sales	69,737		69,964			9,308			3,405			152,414
Gross profit	80,700		52,188			(9,308		)	(3,405		)	120,175
Operating expenses:
Distribution expenses	—		9,308			(9,308		)	—			—
Research, development and technical	13,059		—			—			—			13,059
Selling, general and administrative expenses	25,711		15,043			—			12,270			53,024
Amortization of intangibles	—		3,863			—			(3,863		)	—
Total operating expenses	38,770		28,214			(9,308		)	8,407			66,083
Operating income	41,930		23,974			—			(11,812		)	54,092
Interest expense	513		4,196			—			8,641			13,350
Interest income	1,141		9			—			—			1,150
Loss on the extinguishment of debt	—		194			—			(194		)	—
Derivative fair value gain	—		1,450			—			(1,450		)	—
Other income (expense), net	486		(90		)	—			—			396
Income before income taxes	43,044		20,953			—			(21,709		)	42,288
Provision for income taxes (benefit)	7,873		4,795			—			(5,083		)	7,585
Net income	$	35,171	$	16,158		$	—		$	(16,626	)	$	34,703
Basic earnings per share	$	1.37	$	1.04								$	1.20
Weighted average basic shares outstanding	25,612		15,505									28,849
Diluted earnings per share	$	1.34	$	1.02								$	1.17
Weighted average diluted shares outstanding	26,319		15,905									29,556

¹ Shares outstanding for KMG are from KMG's filed 10-Q for the three months ended April 30, 2018. They are intended for illustrative purposes only and do not impact pro forma EPS calculations at right. Three months ended June 30, 2018 KMG share calculations were not available.

² Represents the reclassification of KMG distribution expenses from operating expenses to cost of sales, in order to conform with Cabot Microelectronics’ accounting policies.

³ Pro forma adjustments are related to items directly attributable to the transaction, such as recurring differences related to depreciation, amortization or financing costs that were included as if the companies were combined as of October 1, 2017.

45

CABOT MICROELECTRONICS CORPORATION

Unaudited Pro Forma Condensed Combined Statements of Income

For the Nine Months Ended June 30, 2018

(in thousands, except per share data)

	Cabot Microelectronics		KMG Chemicals (1)
	Nine Months Ended June 30, 2018		Nine Months Ended June 30, 2018			Presentation Reclassification (2)			Pro Forma Adjustments (3)			Pro Forma  Combined
Revenue	$	433,394	$	351,300		$	—		$	—		$	784,694
Cost of sales	203,635		202,182			26,983			10,259			443,059
Gross profit	229,759		149,118			(26,983		)	(10,259		)	341,635
Operating expenses:
Distribution expenses	—		26,983			(26,983		)	—			—
Research, development and technical	38,578		—			—			—			38,578
Selling, general and administrative expenses	75,051		43,823			—			36,821			155,695
Amortization of intangibles	—		10,835			—			(10,835		)	—
Total operating expenses	113,629		81,641			(26,983		)	25,986			194,273
Operating income	116,130		67,477			—			(36,245		)	147,362
Interest expense	2,803		14,733			—			23,855			41,391
Interest income	3,248		12			—			—			3,260
Loss on the extinguishment of debt	—		6,503			—			(6,503		)	—
Derivative fair value gain	—		5,332			—			(5,332		)	—
Other income (expense), net	113		(1,003		)	—			—			(890		)
Income before income taxes	116,688		50,582			—			(58,929		)	108,341
Provision for income taxes (benefit)	54,863		(3,604		)	—			(13,797		)	37,462
Net income	$	61,825	$	54,186		$	—		$	(45,132	)	$	70,879
Basic earnings per share	$	2.42	$	3.75								$	2.47
Weighted average basic shares outstanding	25,479		14,439									28,716
Diluted earnings per share	$	2.35	$	3.66								$	2.41
Weighted average diluted shares outstanding	26,222		14,814									29,459

¹ Shares outstanding for KMG are from KMG's filed 10-Q for the nine months ended April 30, 2018. They are intended for illustrative purposes only and do not impact pro forma EPS calculations at right. Nine months ended June 30, 2018 KMG share calculations were not available.

² Represents the reclassification of KMG distribution expenses from operating expenses to cost of sales, in order to conform with Cabot Microelectronics’ accounting policies.

³ Pro forma adjustments are related to items directly attributable to the transaction, such as recurring differences related to depreciation, amortization, compensation or financing costs that were included as if the companies were combined as of October 1, 2017.

46

CABOT MICROELECTRONICS CORPORATION

Summary of Pro Forma Adjustments

(in thousands, except per share data)

	Three Months Ended June 30, 2019			Three Months Ended June 30, 2018			Nine Months Ended June 30, 2019			Nine Months Ended June 30, 2018
Impact to cost of sales:
Depreciation and amortization, net(a)	$	—		$	3,405		$	1,459		$	10,259
Inventory step-up(b)	(42		)	—			(14,870		)	—
Impact to cost of sales	$	(42	)	$	3,405		$	(13,411	)	$	10,259
Impact to operating expense:
Depreciation and amortization step up(a)	6,488			12,204			24,416			36,624
Compensation expense(c)	—			66			33			197
Deal costs(d)	(2,792		)	—			(61,179		)	—
Historical KMG amortization in other operating expenses removal(a)	—			(3,863		)	(1,943		)	(10,835		)
Impact to operating expense	$	3,696		$	8,407		$	(38,673	)	$	25,986
Impact to other expense:
Loss on the extinguishment of debt(e)	—			(194		)	—			(6,503		)
Derivative fair value gain(e)	—			1,450			567			5,332
Impact to other expense	$	—		$	1,256		$	567		$	(1,171	)
Impact to interest, net:
Interest expense(f)	2			8,641			(3,143		)	23,855
Impact to interest	$	2		$	8,641		$	(3,143	)	$	23,855

Adjustments included in the accompanying Unaudited Pro Forma Condensed Combined Statements of Income are as follows:

(a) Depreciation and amortization expense are adjusted by removing depreciation and amortization associated with legacy KMG assets and assigning a pro forma expense based on the fair value of the assets on the date of the Acquisition. For periods after the date of the Acquisition, there is no pro forma adjustment for Depreciation and actual booked depreciation is reflected on a straight line basis. Depreciation costs are allocated to costs of sales and selling, general and administrative expenses based on historical KMG allocations. Amortization costs are allocated to costs of sales or selling, general and administrative expense based on the use of the asset, where applicable.

(b) Cost of sales is impacted by increased inventory balance caused by the non-cash impact of the step up to fair value of the inventory. The incremental costs of sales driven by the inventory step-up during the period have been removed.

(c) Directly attributable and non-recurring compensation expense related to non-recurring retention expenses and stock award vesting directly attributable to the Acquisition are removed for pro forma purposes. For KMG stock awards that were replaced by Cabot stock awards in connection with the Acquisition, the vesting for on-going service expenses are added as a pro forma adjustment.

(d) The elimination of non-recurring deal costs incurred in connection with the Acquisition.

(e) As a result of the Acquisition, there were non-recurring costs incurred by KMG as a result of retiring old debt. The costs associated with retiring the old debt facility and other financial instruments are removed for pro forma purposes. These instruments were retired as a result of the Acquisition and are not included in the pro forma results, which are presented as if the Acquisition had occurred on October 1, 2017.

(f) Changes in interest expense as a result of financing associated with the Acquisition. The adjustments remove legacy KMG interest costs, including unused revolver fees and adds the costs associated with the new financing facilities as if the Acquisition occurred on October 1, 2017.

47

We calculated the income tax effect of the pro forma adjustments using a 22.1% and 23.4% tax rate, which represent the weighted average statutory tax rate for nine-month period ended June 30, 2019 and year-ended September 30, 2018, respectively.

Additionally, for the 2018 periods presented, we calculated the unaudited pro forma weighted average number of basic shares outstanding by adding the Cabot Microelectronics weighted average number of basic shares outstanding from the share amounts disclosed in the historical Quarterly Report on Form 10-Q to the amount of shares issued in connection with the Acquisition, as if the shares were held for the entire period.

We calculated the unaudited pro forma weighted average number of diluted shares outstanding by adding the number of shares issued in the Acquisition to the amount disclosed in the historical Cabot Microelectronics Quarterly Report on Form 10-Q.

The basic and diluted EPS calculation takes pro forma net income divided by the applicable number of shares outstanding.

48

Cabot Microelectronics Corporation

Reconciliation of Pro Forma and Non-GAAP Adjusted Pro Forma Information

The company reports its financial results in accordance with U.S. GAAP.  However, management believes that certain non-GAAP financial measures that reflect the way that management evaluates the business may provide investors with additional information regarding the company’s results, trends and ongoing performance on a comparable basis.  We refer to these measures “Adjusted Pro Forma”, which begin with Pro Forma results that are prepared in accordance with SEC Regulation S-X Article 11 and are included above.  These results are then adjusted for the following additional items:

• Removal of amortization of acquisition related intangibles, since management believes that these costs are not indicative of the company’s core operating performance.

• Removal of integration expenses, as they are non-recurring in nature.

• Adjustment for U.S. Tax Reform, which represents a significant non-recurring item affecting comparability among periods.

• Removal of certain costs related to a warehouse fire at KMG-Bernuth.

Reconciliations for these items are provided in the tables below.

49

CABOT MICROELECTRONICS CORPORATION

Unaudited Reconciliation of Pro Forma Condensed Combined

Statement of Income to Non-GAAP Adjusted Pro Forma Condensed

Combined Statement of Income

For the Three Months Ended June 30, 2019

(in thousands, except per share data)

				Non-GAAP Adjustments
	Pro Forma			Amortization of Acquisition Related Intangibles			Integration Expenses			U.S Tax Reform			Costs Related to KMG-Bernuth Warehouse Fire			Adjusted Pro forma
Revenue	$	271,882		$	—		$	—		$	—		$	—		$	271,882
Cost of Sales	156,450			(3,470		)	—			—			(4,200		)	148,780
Gross Profit	115,432			3,470			—						4,200			123,102
Gross Profit, % of Revenue	42.5		%	1.3		%	—		%	—		%	1.5		%	45.3		%
Operating Expenses
Research, development and technical	12,191			—			—						—			12,191
Selling, general and administrative	54,655			(19,942		)	(117		)				(250		)	34,346
Total Operating Expenses	66,846			(19,942		)	(117		)				(250		)	46,537
Operating Income	48,586			23,412			117						4,450			76,565
Interest Expense	12,759			—			—						—			12,759
Interest Income	417			—			—						—			417
Other Income (Expense), net	(472		)	—			—						—			(472		)
Income before income taxes	35,772			23,412			117						4,450			63,751
Provision for income taxes	19,695			5,273			26			(9,128		)	1,002			16,868
Net Income	$	16,077		$	18,139		$	91		$	9,128		$	3,448		$	46,883
Diluted Earnings per share	$	0.54		$	0.62		$	—		$	0.31		$	0.12		$	1.59
Weighted Average Diluted Shares Outstanding	29,568			29,568			29,568			29,568			29,568			29,568
Depreciation & amortization	$	33,076		$	(23,412	)	$	—		$	—		$	—		$	9,664
EBITDA	$	81,190		$	—		$	117					$	4,450		$	85,757
EBITDA Margin	29.9		%				—		%				1.6		%	31.5		%

50

CABOT MICROELECTRONICS CORPORATION

Unaudited Reconciliation of Pro Forma Condensed Combined

Statement of Income to Non-GAAP Adjusted Pro Forma Condensed

Combined Statement of Income

For the Nine Months Ended June 30, 2019

(in thousands, except per share data)

				Non-GAAP Adjustments
	Pro Forma			Amortization of Acquisition Related Intangibles			Integration Expenses			U.S. Tax Reform			Costs Related to KMG-Bernuth Warehouse Fire			Adjusted Pro forma
Revenue	$	821,029		$	—		$	—					$	—		$	821,029
Cost of Sales	457,372			(10,410		)	—						(4,200		)	442,762
Gross Profit	363,657			10,410			—			—			4,200			378,267
Gross Profit, % of Revenue	44.3		%	1.3		%	—		%	—		%	0.5		%	46.1		%
Operating Expenses
Research, development and technical	39,009			—			—						—			39,009
Selling, general and administrative	166,189			(59,826		)	(2,208		)				(250		)	103,905
Total Operating Expenses	205,198			(59,826		)	(2,208		)	—			(250		)	142,914
Operating Income	158,459			70,236			2,208			—			4,450			235,353
Interest Expense	38,372			—			—						—			38,372
Interest Income	2,055			—			—						—			2,055
Other Income (Expense), net	(3,155		)	—			—						—			(3,155		)
Income before income taxes	118,987			70,236			2,208			—			4,450			195,881
Provision for income taxes	30,049			15,818			497			(8,869		)	1,002			38,497
Net Income	$	88,938		$	54,418		$	1,711		$	8,869		$	3,448		$	157,384
Diluted Earnings per share	$	3.02		$	1.84		$	0.06		$	0.30		$	0.12		$	5.34
Weighted Average Diluted Shares Outstanding	29,469			29,469			29,469			29,469			29,469			29,469
Depreciation & amortization	$	100,100		$	(70,236	)	$	—					$	—		$	29,864
EBITDA	$	255,404		$	—		$	2,208		$	—		$	4,450		$	262,062
EBITDA Margin	31.1		%	—			0.3		%				0.5		%	31.9		%

51

CABOT MICROELECTRONICS CORPORATION

Unaudited Reconciliation of Pro Forma Condensed Combined

Statement of Income to Non-GAAP Adjusted Pro Forma Condensed

Combined Statement of Income

For the Three Months Ended June 30, 2018

(in thousands, except per share data)

				Non-GAAP Adjustments
	Pro Forma			Amortization of Acquisition Related Intangibles			U.S. Tax Reform			Adjusted Pro forma
Revenue	$	272,589		$	—		$	—		$	272,589
Cost of Sales	152,414			(3,470		)	—			148,944
Gross Profit	120,175			3,470			—			123,645
Gross Profit, % of Revenue	44.1		%	1.3		%	—		%	45.4		%
Operating Expenses
Research, development and technical	13,059			—			—			13,059
Selling, general and administrative	53,024			(12,380		)	—			40,644
Total Operating Expenses	66,083			(12,380		)	—			53,703
Operating Income	54,092			15,850			—			69,942
Interest Expense	13,350			—			—			13,350
Interest Income	1,150			—			—			1,150
Other Income (Expense), net	396			—			—			396
Income before income taxes	42,288			15,850			—			58,138
Provision for income taxes	7,585			3,569			511			11,665
Net Income	$	34,703		$	12,281		$	(511	)	$	46,473
Diluted Earnings per share	$	1.17		$	0.42		$	(0.02	)	$	1.57
Weighted Average Diluted Shares Outstanding	29,556			29,556			29,556			29,556
Depreciation & amortization	$	25,732		$	(15,850	)	$	—		$	9,882
EBITDA	$	80,220		$	—		$	—		$	80,220
EBITDA Margin	29.4		%	—		%	—		%	29.4		%

52

CABOT MICROELECTRONICS CORPORATION

Unaudited Reconciliation of Pro Forma Condensed Combined

Statement of Income to Non-GAAP Adjusted Pro Forma Condensed

Combined Statement of Income

For the Nine Months Ended June 30, 2018

(in thousands, except per share data)

				Non-GAAP Adjustments
	Pro Forma			Amortization of Acquisition Related Intangibles			U.S. Tax Reform			Adjusted Pro forma
Revenue	$	784,694		$	—		$	—		$	784,694
Cost of Sales	443,059			(10,335		)	—			432,724
Gross Profit	341,635			10,335			—			351,970
Gross Profit, % of Revenue	43.5		%	1.3		%	—		%	44.9		%
Operating Expenses
Research, development and technical	38,578			—			—			38,578
Selling, general and administrative	155,695			(37,140		)	—			118,555
Total Operating Expenses	194,273			(37,140		)	—			157,133
Operating Income	147,362			47,475			—			194,837
Interest Expense	41,391			—			—			41,391
Interest Income	3,260			—			—			3,260
Other Income (Expense), net	(890		)	—			—			(890		)
Income before income taxes	108,341			47,475			—			155,816
Provision for income taxes	37,462			10,692			(20,255		)	27,899
Net Income	$	70,879		$	36,783		$	20,255		$	127,917
Diluted Earnings per share	$	2.41		$	1.24		$	0.69		$	4.34
Weighted Average Diluted Shares Outstanding	29,459			29,459			29,459			29,459
Depreciation & amortization	$	77,511		$	(47,475	)	$	—		$	30,036
EBITDA	$	223,983		$	—		$	—		$	223,983
EBITDA Margin	28.5		%	—			—			28.5		%

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ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

EFFECT OF FOREIGN CURRENCY EXCHANGE RATES AND EXCHANGE RATE RISK MANAGEMENT

We conduct business operations outside of the United States through our foreign operations.  Some of our foreign operations maintain their accounting records in their local currencies.  Consequently, period to period comparability of results of operations is affected by fluctuations in exchange rates.  The primary currencies to which we have exposure are the Korean won, Japanese yen, Euro, Singapore dollar and the New Taiwan dollar.  Approximately 33% of our revenue is transacted in currencies other than the U.S. dollar.  However, we also incur expenses in foreign countries that are transacted in currencies other than the U.S. dollar, which provides a natural hedge and mitigates the exposure on our Consolidated Statements of Income.  We periodically enter into forward contracts in an effort to manage foreign currency exchange exposure on our Consolidated Balance Sheets.  However, we are unlikely to be able to hedge these exposures completely.  We do not enter into forward contracts or other derivative instruments for speculative or trading purposes.

Fluctuations in foreign currencies have not had a material impact on our Consolidated Statements of Income for the nine months ended June 30, 2019 and 2018. During the nine months ended June 30, 2019, we recorded $4.1 million in foreign currency translation gains, net of tax, that are included in other comprehensive income.  These gains and losses primarily relate to changes in the U.S. dollar value of assets and liabilities denominated in local currencies when these asset and liability amounts are translated at month-end exchange rates.

MARKET RISK AND SENSITIVITY ANALYSIS RELATED TO FOREIGN EXCHANGE RATE RISK

We have performed a sensitivity analysis assuming a hypothetical 10% additional adverse movement in foreign exchange rates.  As of June 30, 2019, the analysis demonstrated that such market movements would not have a material adverse effect on our consolidated financial position, results of operations or cash flows over a one-year period.  Actual gains and losses in the future may differ materially from this analysis based on changes in the timing and amount of foreign currency rate movements and our actual exposures.

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ITEM 4. CONTROLS AND PROCEDURES

EVALUATION OF DISCLOSURE CONTROLS AND PROCEDURES

Our management, with the participation of our Chief Executive Officer (CEO) and Chief Financial Officer (CFO), has conducted an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended) as of June 30, 2019.  Based on that evaluation, our CEO and CFO have concluded that our disclosure controls and procedures were effective such that information required to be disclosed in our Exchange Act reports is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to management, including the CEO and CFO, as appropriate to allow timely decisions regarding required disclosure.

CHANGES IN INTERNAL CONTROL OVER FINANCIAL REPORTING

The Company is in the process of integrating KMG into the Company’s internal control over financial reporting. As a result of these integration activities, certain controls will be evaluated and may be changed. Excluding the Acquisition, there were no changes in the Company’s internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

INHERENT LIMITATIONS ON EFFECTIVENESS OF CONTROLS

Because of inherent limitations, our disclosure controls or our internal control over financial reporting may not prevent all errors and all fraud.  A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met.  Further, the design of a control system must take into account the benefits of controls relative to their costs.  Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within the Company have been detected.  These inherent limitations include possible faulty judgment in decision-making and breakdowns due to a simple error or mistake.  Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the controls.  The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions.  Over time, controls may become inadequate because of changes in conditions, or the degree of compliance with policies or procedures may deteriorate.  Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected.

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PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

The information set forth in Note 12 “Commitments and Contingencies,” to the consolidated financial statements included in Item 1 of Part I of this Report on Form 10-Q is incorporated herein by reference.

ITEM 1A. RISK FACTORS

RISKS RELATING TO OUR BUSINESS

DEMAND FOR OUR PRODUCTS FLUCTUATES AND OUR BUSINESS MAY BE ADVERSELY AFFECTED BY WORLDWIDE ECONOMIC AND INDUSTRY CONDITIONS

Our business is affected by economic and industry conditions and the majority of our revenue derives from our Electronic Materials segment, which is primarily dependent upon semiconductor demand. With respect to our Electronic Materials segment, historically, semiconductor demand has fluctuated due to economic and industry cycles and seasonal shifts in demand, which can affect our business, causing demand for our electronic materials products to fluctuate. For example, we have experienced relatively soft demand conditions in the semiconductor industry during our second and third fiscal quarters of 2019. Previously, the strengthening of demand conditions in the semiconductor industry we experienced during the second half of fiscal 2016 continued through fiscal 2018, following relatively soft demand conditions during the first half of fiscal 2016. Furthermore, competitive dynamics within the semiconductor industry may impact our business. Our limited visibility to future customer orders makes it difficult for us to predict industry trends. If the global economy or the semiconductor industry weakens, whether in general or as a result of specific factors, such as macroeconomic factors, or unpredictable events such as natural disasters or geopolitical events, we could experience material adverse impacts on our results of operations and financial condition. Some additional factors that may affect demand for our electronic materials products include: demand trends for different types of electronic devices, such as logic versus memory IC devices, or digital versus analog IC devices; the various technology nodes at which those products are manufactured; customers' efficiencies in the use of CMP consumables and/or high-purity process chemicals (“electronic chemicals”); customers' device architectures and specific manufacturing processes; the short order to delivery time for our products; quarter-to-quarter changes in customer order patterns; market share and competitive gains and losses; and pricing changes by us and our competitors.

As to our Performance Materials segment, which continues to be an area of potential continued growth for us, our business may be impacted by changes in the utilities and/or oil and gas industries.  Volatility in oil and natural gas prices may impact our customers’ activity levels, including production, and spending on our performance materials products and services. Expectations about future prices and price volatility are important in determining future spending levels for customers of our pipeline performance products and services. Historically, worldwide oil and natural gas prices and markets have been volatile, and may continue to be so in the future. Prices for oil and natural gas are subject to wide fluctuations in response to relatively minor changes in the supply of and demand for oil and natural gas, market uncertainty and a variety of additional factors that are beyond our control. These factors include, but are not limited to, increases in supplies from U.S. shale production, international political conditions, including uprisings and political unrest, sovereign debt crises, the domestic and foreign supply of oil and natural gas, the level of consumer demand due to economic growth in countries such as China, weather conditions, domestic and foreign governmental regulations and taxes, the price and availability of alternative fuels, the health of international economic and credit markets, the ability of the members of the Organization of Petroleum Exporting Countries and other state-controlled oil companies to agree upon and maintain oil price and production controls, and general economic conditions.

Further, adverse global economic and industry conditions could have other negative effects on our Company. For instance, we could experience negative impacts on cash flows due to the inability of our customers to pay their obligations to us, or our production processes could be harmed if our suppliers cannot fulfill their obligations to us. We also might have to reduce the carrying value of goodwill and other intangible assets, which could harm our financial position and results of operations.

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WE MAY PURSUE ACQUISITIONS OF, INVESTMENTS IN, AND MERGERS OR STRATEGIC ALLIANCES WITH OTHER ENTITIES, WHICH COULD DISRUPT OUR OPERATIONS AND HARM OUR OPERATING RESULTS IF THEY ARE UNSUCCESSFUL, OR WE MAY ENCOUNTER UNANTICIPATED ISSUES IN IMPLEMENTING THEM

We expect to continue to make investments in technologies, assets and companies, either through acquisitions, mergers, investments or alliances, in order to supplement our organic growth and development efforts. Acquisitions, mergers, and investments, including our acquisitions of KMG, which we completed in November 2018, and NexPlanar, which we completed in October 2015, involve numerous risks, including the following: difficulties and risks in integrating the operations, technologies, products and personnel of acquired companies; difficulties and risks from unanticipated issues arising subsequent to a transaction related to the other entity; potential disruption of relationships with third parties; diversion of management's attention from normal daily operations of the business; increased risk associated with foreign operations; potential difficulties and risks in entering markets in which we have limited or no direct prior experience and where competitors have stronger positions; potential difficulties and unexpected situations arising in operating new businesses with different business models; facilities and operations; potential difficulties with regulatory or contract compliance in areas in which we have limited experience; initial dependence on unfamiliar supply chains or relatively small supply partners; insufficient revenues to offset increased expenses associated with acquisitions; potential loss of key employees of the acquired companies; or inability to effectively cooperate and collaborate with our alliance partners.

Further, we may never realize the perceived or anticipated benefits of a business combination or merger with, or asset or other acquisition of, or investments in, other entities. Transactions such as our acquisitions of KMG and NexPlanar could and in some cases have had negative effects on our results of operations, in areas such as contingent liabilities, gross margins, amortization charges related to intangible assets and other effects of accounting for the purchases of other business entities. Investments in and acquisitions of technology-related companies or assets are inherently risky because these businesses or assets may never develop, and we may incur losses related to these investments. In addition, we may be required to impair the carrying value of these acquisitions or investments to reflect other than temporary declines in their value, which could harm our business and results of operations.

The integration of the recently acquired KMG business into our operations is a complex and time-consuming process that may not be successful. Our Company has a limited history of integrating a significant acquisition into its business and the process of integration may produce unforeseen operating difficulties and expenditures. The primary areas of focus for successfully combining the business of KMG with our operations may include, among others: retaining and integrating key employees; realizing synergies; aligning customer and supplier interface, and operations across the combined business; integrating enterprise resource planning and other information technology systems; and managing the growth of the combined company. Even if we successfully integrate the business of KMG into our operations, there can be no assurance that we will realize the anticipated benefits of the Acquisition.

WE HAVE A CONCENTRATED PRODUCT RANGE WITHIN EACH OF OUR SEGMENTS AND OUR PRODUCTS MAY BECOME OBSOLETE, OR TECHNOLOGICAL CHANGES MAY REDUCE OR LIMIT INCREASES IN THE CONSUMPTION OF OUR PRODUCTS

Although our product offerings have expanded with the acquisition of KMG, our business remains substantially dependent on products in our Electronic Materials segment, such as CMP slurries, pads and electronic chemicals, which account for the majority of our revenue.  We have identified our Performance Materials segment as another area of potential continued growth and the product offerings in our Performance Materials segment are similarly concentrated.  As such, our business would suffer if these products became obsolete or if consumption of these products decreased. Our success depends on our ability to keep pace with technological changes and advances in the industries in which we operate, particularly the semiconductor industry, and to adapt, improve and customize our products in response to evolving customer needs and industry trends. Since its inception, the semiconductor industry, which is the largest industry in which we operate, has experienced technological changes and advances in the design, manufacture, performance and application of IC devices.  Our customers continually pursue lower cost of ownership and higher quality and performance of materials consumed in their manufacturing processes, including CMP slurries and pads and electronic chemicals, as a means to reduce costs, increase the yield in their manufacturing facilities, and achieve desired performance of the IC devices they produce. We expect these technological changes, and this drive toward lower costs, higher quality and performance and higher yields, will continue in the future. Potential technology developments in the semiconductor industry, as well as our customers' efforts to reduce consumption of CMP consumables, including through use of smaller quantities, could render our products less important to the IC device manufacturing process.

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A SIGNIFICANT AMOUNT OF OUR BUSINESS COMES FROM A LIMITED NUMBER OF LARGE CUSTOMERS AND OUR REVENUE AND PROFITS COULD DECREASE SIGNIFICANTLY IF WE LOST ONE OR MORE OF THESE CUSTOMERS OR BUSINESS FROM THEM

Our customer base is concentrated among a limited number of large customers in each of our segments.  Currently, our principal business is to supply electronic materials primarily to the semiconductor industry. The semiconductor industry has been consolidating as the larger semiconductor manufacturers have generally grown faster than the smaller ones, through business gains, mergers and acquisitions, and strategic alliances. Industry analysts predict that this trend will continue, which means the semiconductor industry will be comprised of fewer and larger participants in the future if their prediction is correct. In addition, our customer base in our pipeline-related businesses is also somewhat concentrated, with large entities predominant, and outside of the United States, these entities frequently are state-owned or sponsored and limited in number per country, as described more above. One or more of these principal customers could stop buying products from us or could substantially reduce the quantity of products purchased from us. Our principal customers also hold considerable purchasing power, which can impact the pricing and terms of sale of our products. Any deferral or significant reduction in the quantity or price of products sold to these principal customers could seriously harm our business, financial condition and results of operations.

In fiscal 2018, our five largest customers accounted for approximately an aggregate 57% of our revenue, with Samsung, Taiwan Semiconductor Manufacturing Company and SK Hynix Inc. accounting for approximately 18%, 12%, and 10%, respectively, of our revenue.

ANY PROBLEM OR DISRUPTION IN OUR SUPPLY CHAIN, INCLUDING SUPPLY OF OUR MOST IMPORTANT RAW MATERIALS, OR IN OUR ABILITY TO MANUFACTURE OR DELIVER OUR PRODUCTS TO OUR CUSTOMERS, COULD ADVERSELY AFFECT OUR RESULTS OF OPERATIONS

We depend on our supply chain to enable us to meet the demands of our customers. Our supply chain includes the raw materials we use to manufacture our products, our production operations and the means by which we deliver our products to our customers. Our business could be adversely affected by any problem or interruption in the supply of the key raw materials we use in our products, including raw materials that do not meet the stringent quality and consistency requirements of our customers, any problem or interruption that may occur during production or delivery of our products, such as weather-related problems, natural disasters, or geopolitical, trade or labor-related issues, or any difficulty in producing sufficient quantities of our products to meet growing demand from our customers. In particular, severe weather conditions have the potential to adversely affect our operations, damage facilities and increase our costs, and those conditions may also have an indirect effect on our operations by disrupting services provided by service companies or suppliers with whom we have a business relationship.  Additionally, some of our full-time employees are represented by labor unions, workers councils or comparable organizations, particularly in Mexico and Europe. As our current agreements expire, we cannot provide assurance that new agreements will be reached at the end of each period without union action, or that a new agreement will be reached on terms satisfactory to us. An extended work stoppage, slowdown or other action by our employees could significantly disrupt our business. Future labor contracts may be on terms that result in higher labor costs to us, which also could adversely affect our results of operations. Our supply chain may also be negatively impacted by unanticipated price increases due to supply restrictions beyond the control of our Company or our raw materials suppliers.

We believe it would be difficult to promptly secure alternative sources of key raw materials in the event one of our suppliers becomes unable to supply us with sufficient quantities of raw materials that meet the quality and technical specifications required by us and our customers. In addition, new contract terms, forced production or manufacturing changes, contractual amendments to existing agreements with, or non-performance by, our suppliers, including any significant financial distress our suppliers may suffer, could adversely affect us. Also, if we change the supplier or type of key raw materials we use to make our products, in particular our electronic materials products, or are required to purchase them from a different manufacturer or manufacturing facility or otherwise modify our products, in certain circumstances our customers might have to requalify our products for their manufacturing processes and products. The requalification process could take a significant amount of time and expense to complete and could occupy technical resources of our customers that might otherwise be used to evaluate our new products, thus delaying potential revenue growth, or motivate our customers to consider purchasing products from our competitors, possibly interrupting or reducing our sales of products to these customers, especially sales of our electronic materials products to our semiconductor industry customers.

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OUR BUSINESS COULD BE SERIOUSLY HARMED IF OUR COMPETITORS DEVELOP COMPETITIVE PRODUCTS, OFFER BETTER PRICING, SERVICE OR OTHER TERMS, OR OBTAIN OR ASSERT CERTAIN INTELLECTUAL PROPERTY RIGHTS

Competition from other electronic materials or performance materials manufacturers or any new entrants could seriously harm our business and results of operations, and this competition could continue to increase. Competition has and will likely continue to impact the prices we are able to charge for our products, as well as our overall business. In addition, our competitors could have, obtain or assert intellectual property rights that could affect or restrict our ability to market our existing products and/or to innovate and develop new products, thus increasing our costs of doing business, could attempt to introduce products similar to ours following the expiration of our patents, or could attempt to introduce products that do not fall within the scope of our intellectual property rights.

WE ARE SUBJECT TO RISKS ASSOCIATED WITH OUR FOREIGN OPERATIONS

We currently have operations and a large customer base outside of the United States.  Approximately 87% of our revenue was generated by sales to customers outside of the United States for the full fiscal year ended September 30, 2018.  We may encounter risks in doing business in certain foreign countries, including, but not limited to, adverse changes in economic and political conditions, both in foreign locations and in the United States with respect to non-U.S. operations of U.S. businesses like ours, geopolitical and/or trade tensions, fluctuation in exchange rates, changes in international trade requirements and sanctions and/or tariffs that affect our business and that of our customers and suppliers, compliance with a variety of foreign laws and regulations and related audits and investigations, as well as difficulty in enforcing business and customer contracts and agreements, including protection of intellectual property rights. We also may encounter risks that we may not be able to repatriate additional earnings from our foreign operations, derive anticipated tax benefits of our foreign operations or recover the investments made in our foreign operations, whether due to regulatory or policy changes in the U.S. or in the countries outside of the U.S. in which we do business, or other factors.

In particular, China continues to be a fast-developing market for the semiconductor industry, and an area of potential continued growth for us. As business volume between China and the rest of the world continues to grow, there is risk that geopolitical, regulatory, trade and political matters could adversely affect business for companies like ours based on the complex relationships among China, the United States, and other countries in the Asia Pacific region, which could have a material adverse impact on our business.  In addition, there are risks that the Chinese government may, among other things, require the use of local suppliers, compel companies that do business in China to partner with local companies to conduct business, and, provide incentives to government-backed local customers to buy from local suppliers rather than companies like ours, all of which could adversely impact our business, including our results of operations.

In addition, we have operations and customers located in the United Kingdom. In June 2016, the United Kingdom held a referendum in which voters approved an exit from the European Union (“Brexit”).  In March 2017, the United Kingdom formally notified the European Union of its intention to withdraw, and withdrawal negotiations began in June 2017. The United Kingdom will cease to be a member state when a withdrawal agreement is entered into (such agreement will also require parliamentary approval) or, failing that, two years following the notification of an intention to leave the European Union, unless the European Union (together with the United Kingdom) unanimously decides to extend this period. In March 2018, the European Union announced an agreement in principle to transitional provisions under which most European Union law would remain in force in the United Kingdom until the end of December 2020, however, this transitional period remains subject to the successful conclusion of a final withdrawal agreement between the parties. In the absence of such an agreement, there would be no transitional provisions and a “hard” Brexit would occur. In April 2019, the United Kingdom and European Union agreed that the transitional provisions are extended until October 31, 2019. Although it is unknown what the terms of such an agreement, assuming it is reached, will be, it is possible that there will be greater restrictions on imports and exports between the United Kingdom and European Union countries, a fluctuation in currency exchange rates and increased regulatory complexities. These changes may adversely affect our operations and financial results. While such changes in laws, regulations and conditions have not had a material adverse effect on our business or financial condition to date, we cannot provide assurances regarding the future effect of any such changes.

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WE ARE SUBJECT TO EXTENSIVE ENVIRONMENTAL LAWS AND REGULATIONS AND MAY INCUR COSTS THAT HAVE AN ADVERSE EFFECT ON OUR FINANCIAL CONDITION AS A RESULT OF VIOLATIONS OF OR LIABILITIES UNDER THEM

Like other companies involved in environmentally sensitive businesses, our operations and properties are subject to extensive and stringent federal, state, local and foreign environmental, health and safety (EHS) laws and regulations, including those concerning, among other things:

• the marketing, sale, use and registration of our chemical products, such as pentachlorophenol (“penta”), which is part of the wood treatment business in our Performance Materials segment;

• the treatment, storage and disposal of wastes;

• the investigation and remediation of contaminated media including but not limited to soil and groundwater;

• the discharge of effluents into waterways;

• the emission of substances into the air; and

• other matters relating to environmental protection and various health and safety matters.

The United States Environmental Protection Agency (“EPA”) and other federal and state agencies in the United States, as well as comparable agencies in other countries where we have facilities or sell our products, have the authority to promulgate regulations that could have a material adverse impact on our operations. These EHS laws and regulations may require permits for certain types of operations, require the installation of expensive pollution control equipment, place restrictions upon operations or impose substantial liability for pollution and other EHS concerns resulting from our operations. Compliance with EHS laws and regulations has resulted in ongoing costs for us and could restrict our ability to modify or expand our facilities, continue production, require us to install costly pollution control equipment, or incur significant other expenses, including remediation costs. We are currently involved in investigation and remediation activities at certain sites, such as at KMG-Bernuth's Tuscaloosa, Alabama facility as described in Part 1, Note 12 of this Report on Form 10-Q. We have incurred, and expect to continue to incur, significant costs to comply with EHS laws or to address liabilities for contamination resulting from past or present operations. Federal, state and foreign governmental authorities may seek fines and penalties, as well as injunctive relief, for violation of EHS laws and regulations, and could, among other things, impose liability on us to cleanup or mitigate environmental, natural resources or other damages resulting from a release of pesticides, hazardous materials or other chemicals into the environment. We maintain insurance coverage for sudden and accidental environmental damages. We do not believe that insurance coverage for environmental damage that occurs over time is available at a reasonable cost. Also, we do not believe that insurance coverage for the full potential liability that could be caused by sudden and accidental incidences is available at a reasonable cost. Accordingly, we may be subject to an uninsured or under-insured loss in such cases; although unknown at present, the KMG-Bernuth warehouse fire may be such an instance.

1. The distribution, sale and use of our products is subject to prior governmental approvals and thereafter ongoing governmental regulation: Our products are subject to laws administered by federal, state and foreign governments, including regulations requiring registration, approval and labeling. The labeling requirements restrict the use and type of application for our products. More stringent restrictions could make our products less desirable which would adversely affect our sales and profitability. All venues where our penta products are used also require registration prior to marketing or use.

Governmental regulatory authorities have required, and may require in the future, that certain scientific testing and data production be provided on our products. Under the Federal Insecticide, Fungicide and Rodenticide Act (“FIFRA”), EPA requires registrants to submit a wide range of scientific data to support U.S. registrations. This requirement significantly increases our operating expenses, and we expect those expenses will continue in the future. Because scientific analyses are constantly improving, we cannot determine with certainty whether or not new or additional tests may be required by regulatory authorities. While good laboratory practice standards specify the minimum practices and procedures that must be followed in order to ensure the quality and integrity of data related to these tests submitted to the EPA, there can be no assurance that the EPA will not request certain tests or studies be repeated. In addition, more stringent legislation or requirements may be imposed in the future.  Recent changes to the Toxic Substances Control Act (“TSCA”) could result in increased regulation and required testing of chemicals we manufacture and could increase the costs of compliance for our operations. We can provide no assurance that the cost of such compliance will not adversely affect our profitability. Our products could also be subject to other future regulatory action that may result in restricting or completely banning their use which could have an adverse effect on our performance and results of operations.

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2. The Registration, Evaluation and Authorization of Chemicals (“REACH”) legislation may affect our ability to manufacture and sell certain products in the European Union: REACH requires chemical manufacturers and importers in the European Union to prove the safety of their products. We were required to pre-register certain products and file comprehensive reports, including testing data, on each chemical substance, and perform chemical safety assessments. Additionally, substances of high concern are subject to an authorization process. Authorization may result in restrictions on certain uses of products or even prohibitions on the manufacture or importation of products. The full registration requirements of REACH are phased in over several years. We will incur additional expense to cause the registration of our products under these regulations. REACH may also affect our ability to import, manufacture and sell certain products in the European Union.  In addition, other countries and regions of the world already have or may adopt legislation similar to REACH that affect our business, affect our ability to import, manufacture or sell certain products in these jurisdictions, and have required or will require us to incur increased costs.

3. The classification of pentachlorophenol as a Persistent Organic Pollutant (“POP”) under the Stockholm Convention may adversely affect our ability to manufacture or sell our penta products: The Conference of the Parties (“COP”) accepted the recommendation of the United Nations Persistent Organic Pollutant Review Committee that the use of penta should be banned except that its use for the treatment of utility poles and crossarms could continue for an extended period of five to ten years. KMG-Bernuth supplies penta to industrial customers who use it primarily to treat utility poles and crossarms. The U.S. is not bound by the determination of the COP because it did not ratify the Stockholm Convention treaty. Canada and Mexico are governed by the treaty. KMG-Bernuth's sole penta manufacturing facility is located in Matamoros, Mexico, and its processing facility is located in Tuscaloosa, Alabama. As a result of the classification of penta as a POP, the Mexican government has requested that the Matamoros penta manufacturing facility be relocated, and in July 2019, KMG-Bernuth has communicated plans to close this facility by the end of 2021. KMG-Bernuth is in the process of identifying a potential site in the U.S. for such relocation, as well as to close the Tuscaloosa facility and consolidate into this new facility. No assurance can be given that we will not incur significant expenditures in connection with such relocation and related closures, that we will find an adequate location within the required timeframe, or that the ultimate action of the COP will not adversely impact on our financial condition and results of operation.

4. If our products are not re-registered by the EPA or are re-registered subject to new restrictions, our ability to sell our products may be curtailed or significantly limited: KMG-Bernuth's penta product registrations are under continuous review by the EPA under FIFRA. KMG-Bernuth has submitted and will submit a wide range of scientific data to support its U.S. registrations. To satisfy the registration review, KMG-Bernuth is required to demonstrate, among other things, that its products will not cause unreasonable adverse effects on human health or the environment when used according to approved label directions. In September 2008, the EPA announced that it had determined that penta was eligible for re-registration, but the EPA proposed new restrictions on the use of penta that have required KMG-Bernuth's customers to incur substantial additional costs and to revise certain operating procedures. In December 2014, the EPA issued a registration review work plan that required penta registrants to provide additional research and testing data respecting certain potential risks to human health or the environment as a further condition to continued registration. KMG-Bernuth conducted required testing. but cannot tell you when or if the EPA will issue a final decision concluding that the conditions of re-registration for its penta products and all additional testing requirements have been satisfied. We cannot assure you that KMG-Bernuth's products will not be subject to use or labeling restrictions that may have an adverse effect on our financial position and results of operations. The failure of KMG-Bernuth's current or future-acquired products to be re-registered, to satisfy the registration review by the EPA, or the imposition of new use, labeling or other restrictions in connection with re-registration could have an adverse effect on our financial condition and results of operations.

5. Our use of hazardous materials exposes us to potential liabilities: Our manufacturing and distribution of chemical products, such as our electronic chemicals, involves the controlled use of hazardous materials. Our operations, therefore, are subject to various associated risks, including chemical spills, discharges or releases of toxic or hazardous substances or gases, fires, mechanical failure, storage facility leaks and similar events. Our suppliers are subject to similar risks that may adversely impact the availability of raw materials. While we adapt our manufacturing and distribution processes to the environmental control standards of regulatory authorities, we cannot completely eliminate the risk of accidental contamination or injury from hazardous or regulated materials, including injury of our employees, individuals who handle our products or goods treated with our products, or others who claim to have been exposed to our products, nor can we completely eliminate the unanticipated interruption or suspension of operations at our facilities due to such events. We may be held liable for significant damages or fines in the event of contamination or injury, and such assessed damages or fines could have an adverse effect on our financial performance and results of operations.

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FUTURE CLIMATE CHANGE REGULATION COULD RESULT IN INCREASED OPERATING COSTS AND REDUCED DEMAND FOR OUR PRODUCTS

Although the U.S. has not ratified the Kyoto Protocol, a number of federal laws related to “greenhouse gas” or “GHG” emissions have been considered by Congress. Because of the lack of any comprehensive legislation program addressing GHGs, the EPA is using its existing regulatory authority to promulgate regulations requiring reduction in GHG emissions from various categories of sources, such as when a permit is required due to emissions of other pollutants. In addition, various state, local and regional regulations and initiatives have been enacted or are being considered related to GHGs.

Member States of the European Union each have an overall cap on emissions, which are approved by the European Commission, and implement the EU Emissions Trading Directive as a commitment to the Kyoto Protocol. Under this Directive, organizations apply to the Member State for an allowance of GHG emissions. These allowances are tradable so as to enable companies that manage to reduce their GHG emissions to sell their excess allowances to companies that are not reaching their emissions objectives. Failure to purchase sufficient allowances will require the purchase of allowances at a current market price.

Any laws or regulations that may be adopted to restrict or reduce emissions of GHGs could cause an increase to our raw material costs, require us to incur increased operating costs, and have an adverse effect on demand for our products and our financial performance and results for our business.

OUR PRODUCTS MAY BE RENDERED OBSOLETE OR LESS ATTRACTIVE BY CHANGES IN INDUSTRY REQUIREMENTS OR BY SUPPLY-CHAIN DRIVEN PRESSURES TO SHIFT TO ENVIRONMENTALLY PREFERABLE ALTERNATIVES

Changes in regulatory, legislative and industry requirements, or changes driven by supply-chain pressures, may shift current customers away from products using penta or certain of our other products and toward alternative products that are believed to have fewer environmental effects. The EPA, foreign and state regulators, local governments, private environmental advocacy organizations and a number of large industrial companies have proposed or adopted policies designed to decrease the use of a variety of chemicals, including penta and others included in certain of our products. Our ability to anticipate changes in regulatory, legislative, and industry requirements, or changes driven by supply-chain pressures, affects our ability to remain competitive. Further, we may not be able to comply with changed or new regulatory or industrial standards that may be necessary for us to remain competitive.

We cannot assure you that the EPA, foreign and state regulators or local governments will not restrict the uses of penta or certain of our other products or ban the use of one or more of these products.  Similarly, companies who use our products may decide to reduce significantly or cease the use of our products voluntarily. As a result, our products may become obsolete or less attractive to our customers.

BECAUSE WE RELY ON OUR INTELLECTUAL PROPERTY, OUR FAILURE TO ADEQUATELY OBTAIN OR PROTECT IT COULD SIGNIFICANTLY HARM OUR BUSINESS

Protection of intellectual property is particularly important in our industry because we develop complex technical formulas and processes for products that are proprietary in nature and differentiate our products from those of our competitors. Our intellectual property is important to our success and ability to compete. We attempt to protect our intellectual property rights through a combination of patent, trademark, copyright and trade secret laws, as well as employee and third-party nondisclosure and assignment agreements. In addition, we protect our product differentiation through various other means, such as proprietary supply arrangements for certain raw materials, and use of certain manufacturing technologies. Due to our international operations, we pursue protection in different jurisdictions, which may provide varying degrees of protection, and we cannot provide assurance that we can obtain adequate protection in each such jurisdiction.  Our failure to obtain or maintain adequate protection of our intellectual property rights for any reason, including through the patent prosecution process or in the event of litigation related to such intellectual property, could seriously harm our business.  In addition, certain types of intellectual property, such as patents, expire after a certain period of time, and products protected by our patents then lose such protection, so we refresh our intellectual property portfolio on an ongoing basis through continued innovation, and failure to do so could adversely affect our business. Also, the costs of obtaining or protecting our intellectual property could negatively affect our operating results.

62

OUR INABILITY TO ATTRACT AND RETAIN KEY PERSONNEL COULD CAUSE OUR BUSINESS TO SUFFER

We utilize and rely upon a global workforce. If we fail to attract and retain the necessary managerial, technical and customer support personnel, our business and our ability to maintain existing and obtain new customers, develop new products and provide acceptable levels of customer service could suffer. We compete worldwide with other industry participants for qualified personnel, particularly those with significant experience in the semiconductor industry. The loss of services of key employees, or our inability to obtain or maintain visas or other travel or residency documents on their behalf with respect to our business needs, could harm our business and results of operations. Periodically, we engage in succession planning for our key employees, and our Board of Directors reviews succession planning for our executive officers, including our chief executive officer, on an annual basis.

BECAUSE WE HAVE LIMITED EXPERIENCE IN BUSINESS AREAS OUTSIDE OF ELECTRONIC MATERIALS AND PERFORMANCE MATERIALS, EXPANSION OF OUR BUSINESS INTO OTHER PRODUCTS AND APPLICATIONS MAY NOT BE SUCCESSFUL

An element of our strategy has been to leverage our customer relationships, technological expertise and other capabilities and competencies to expand our business.  For example, we have made acquisitions to expand beyond CMP consumables into other electronic materials product areas. In addition, in our Engineered Surface Finishes business, we have been pursuing other surface modification applications. Expanding our business into new product areas could involve technologies, production processes and business models in which we have limited experience, and we may not be able to develop and produce products or provide services that satisfy customers' needs, or we may be unable to keep pace with technological or other developments. Or, we may decide that we no longer wish to pursue these new business initiatives. Also, our competitors may have or obtain intellectual property rights that could restrict our ability to market our existing products and/or to innovate and develop new products.

TAX INCREASES OR CHANGES IN TAX RULES MAY ADVERSELY AFFECT OUR FINANCIAL RESULTS

As a company conducting business on a global basis, we are exposed, both directly and indirectly, to effects of changes in United States, state, local and foreign tax rules. In December 2017, comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the "Tax Act") was enacted in the United States. Known and certain estimated effects based upon current interpretation of the Tax Act have been incorporated into our financial results. As additional clarification and implementation guidance is issued on the Tax Act, it may be necessary to adjust our income tax estimates, as we experienced this quarter with respect to our previously reported Transition Tax describe in Part I, Note 15 of this Report on Form 10-Q.  Adjustments to income tax amounts could be material to our results of operations and cash flows. In addition, there is a risk that state or foreign jurisdictions may amend their tax laws in response to the Tax Act, which could have a material impact on our future results of operations and cash flows.

CERTAIN CRITICAL INFORMATION SYSTEMS COULD BE SUSCEPTIBLE TO CYBERSECURITY AND OTHER THREATS

We maintain and rely upon certain critical information systems for the effective operation of our business. These information systems include, but are not limited to, telecommunications, the Internet, our corporate intranet, various computer hardware and software applications, network communications, and email. These information systems may be owned and maintained by us, our outsourced providers, or third parties such as vendors, contractors, and Cloud providers. All of these information systems are subject to disruption, breach or failure from various sources including, but not limited to, attacks, degradation, and failures resulting from potential sources, including viruses, malware, denial of service, destructive or inadequate code, power failures, and physical damage. Confidential and/or sensitive information stored on these information systems, or transmitted to or from Cloud storage, could be intentionally or unintentionally compromised, lost, and/or stolen. While we have implemented security procedures and virus protection software, intrusion prevention systems, access control, and emergency recovery processes to mitigate risks like these with respect to information systems that are under our control, they are not fail-safe and may be subject to breaches. Further, we cannot assure that third parties upon whom we rely for various IT services will maintain sufficient vigilance and controls over their systems. Our inability to use or access these information systems at critical points in time, or unauthorized releases of personal or confidential information, could unfavorably impact the timely and efficient operation of our business, including our results of operations, and our reputation, as well as our relationships with our employees or other individuals whose information may have been affected by such cybersecurity incidents.

In addition, regulatory authorities have increased their focus on how companies collect, process, use, store, share and transmit personal data. New privacy security laws and regulations, including the United Kingdom's Data Protection Act 2018 and the European Union General Data Protection Regulation 2016 that became effective May 2018, among others, pose increasingly complex compliance challenges, which may increase compliance costs, and any failure to comply with data privacy laws and regulations could result in significant penalties.

63

OUR ABILITY TO RAISE CAPITAL IN THE FUTURE MAY BE LIMITED, WHICH COULD PREVENT US FROM GROWING, AND OUR EXISTING CREDIT AGREEMENT COULD RESTRICT OUR BUSINESS ACTIVITIES

We may in the future be required to raise capital through public or private financing or other arrangements. Such financing may not be available on acceptable terms, or at all, and our failure to raise capital when needed could harm our business. Our Credit Agreement contains financial and other covenants that may restrict our business activities or our ability to execute our strategic objectives, and our failure to comply with these covenants could result in a default under our Credit Agreement. Furthermore, additional equity financing may dilute the interests of our common stockholders, and debt financing, if available, may involve restrictive covenants that could further restrict our business activities or our ability to execute our strategic objectives and could reduce our profitability. If we raise or borrow funds on acceptable terms, we may not be able to grow our business or respond to competitive pressures.

In addition, borrowings under our Credit Facilities generally bear interest based on (a) a London Inter-bank Offered Rate (“LIBOR”), subject to a 0.00% floor, or (b) a base rate, in each case plus an applicable margin of, in the case of borrowings under the Term Loan Facility, 2.25% for LIBOR loans and 1.25% for base rate loans and, in the case of borrowings under the Revolving Credit Facility, initially, 1.50% for LIBOR loans and 0.50% for base rate loans. On July 27, 2017, the Financial Conduct Authority (the authority that regulates LIBOR) announced that it intends to stop compelling banks to submit rates for the calculation of LIBOR after 2021. In the United States, the Alternative Reference Rates Committee (“ARRC”), the working group formed to recommend an alternative rate to LIBOR, has identified the Secured Overnight Financing Rate (“SOFR”) as its preferred alternative rate for USD LIBOR.  When LIBOR ceases to exist after 2021, any calculation of interest based upon the Alternate Base Rate (or any comparable or replacement formulation), may result in higher interest rates. To the extent that these interest rates increase, our interest expense will increase, which could adversely affect our financial condition, operating results and cash flows.

RISKS RELATING TO THE MARKET FOR OUR COMMON STOCK

THE MARKET PRICE MAY FLUCTUATE SIGNIFICANTLY AND RAPIDLY

The market price of our common stock has fluctuated and could continue to fluctuate significantly as a result of factors such as: economic, geopolitical, political and stock market conditions generally and specifically as they may impact participants in the semiconductor and related industries; changes in financial estimates and recommendations by securities analysts who follow our stock; earnings and other announcements, and changes in market evaluations, by securities analysts, investors, market participants or others, of or related to, us or participants in the semiconductor and related industries; changes in business, trade or regulatory conditions affecting us or participants in the semiconductor and related industries; announcements or implementation by us, our competitors, or our customers of technological innovations, new products or different business strategies; changes in our capital deployment strategy, issuances of shares of our capital stock or entering into a business combination or other strategic transaction; and trading volume of our common stock.

ANTI-TAKEOVER PROVISIONS UNDER OUR CERTIFICATE OF INCORPORATION AND BYLAWS MAY DISCOURAGE THIRD PARTIES FROM MAKING AN UNSOLICITED BID FOR OUR COMPANY

Our certificate of incorporation and bylaws, and various provisions of the Delaware General Corporation Law may make it more difficult or expensive to effect a change in control of our Company. For instance, our amended and restated certificate of incorporation provides for the division of our Board of Directors into three classes as nearly equal in size as possible with staggered three-year terms.

We have adopted change in control arrangements covering our executive officers and other key employees. These arrangements provide for a cash severance payment, continued medical benefits and other ancillary payments and benefits upon termination of service of a covered employee's employment following a change in control, which may make it more expensive to acquire our Company.

64

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

ISSUER PURCHASES OF EQUITY SECURITIES

Period	Total Number of Shares Purchased	Average Price paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs (in thousands)
Apr. 1 through Apr. 30, 2019	72	$	125.44	—	$	81,271
May 1 through May 31, 2019	19,900	$	103.55	19,900	$	79,210
June 1 through June 30, 2019	28,035	$	106.64	27,570	$	76,269
Total	48,007	$	105.39	47,470	$	76,269

In January 2016, our Board of Directors authorized an increase in the amount available under our share repurchase program to $150.0 million.   Under this program, we repurchased 48,007 shares for $5.0 million during the third quarter of fiscal 2019.  As of June 30, 2019, $76.3 million remained outstanding under our share repurchase program. The manner in which the Company repurchases its shares is discussed in Part I, Item 2, Management’s Discussion and Analysis of Financial Condition and Results of Operations, under the heading “Liquidity and Capital Resources”, of this Report on Form 10-Q.  To date, we have funded share purchases under our share repurchase program from our available cash balance, and anticipate we will continue to do so.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

Not applicable.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

65

ITEM 6. EXHIBITS

The exhibit numbers in the following list correspond to the number assigned to such exhibits in the Exhibit Table of Item 601 of Regulation S-K:

Exhibit Number	Description
31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101. INS	XBRL Instance Document - The Instance Document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH	XBRL Taxonomy Extension Schema
101.CAL	XBRL Taxonomy Extension Calculation Linkbase
101.DEF	XBRL Taxonomy Extension Definition Linkbase
101.LAB	XBRL Taxonomy Extension Label Linkbase
101.PRE	XBRL Taxonomy Extension Presentation Linkbase

66

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		CABOT MICROELECTRONICS CORPORATION
		[Registrant]
Date: August 9, 2019	By:	/s/ SCOTT D. BEAMER
		Scott D. Beamer Vice President and Chief Financial Officer [Principal Financial Officer]
Date: August 9, 2019	By:	/s/ THOMAS S. ROMAN
		Thomas S. Roman Corporate Controller [Principal Accounting Officer]

67

EX-31.1

Exhibit 31.1

CERTIFICATION

I, David H. Li, Chief Executive Officer of Cabot Microelectronics Corporation, certify that: 

1. I have reviewed this quarterly report on Form 10-Q of Cabot Microelectronics Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of registrant's board of directors:

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting

Date: August 9, 2019	/s/ DAVID H. LI
	David H. Li Chief Executive Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Cabot Microelectronics Corporation (the "Company") on Form 10-Q for the fiscal quarter ended June 30, 2019, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), each of the undersigned officers of the Company certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

August 9, 2019	/s/ DAVID H. LI
	David H. Li
	Chief Executive Officer
August 9, 2019	/s/ SCOTT D. BEAMER
	Scott D. Beamer
	Chief Financial Officer

EX-32.2

Exhibit 31.2

CERTIFICATION

I, Scott D. Beamer, Chief Financial Officer of Cabot Microelectronics Corporation, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Cabot Microelectronics Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of registrant's board of directors:

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: August 9, 2019	/s/ SCOTT D. BEAMER
	Scott D. Beamer Chief Financial Officer

XML

Cover Page - shares	9 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	000-30205
Entity Registrant Name	CABOT MICROELECTRONICS CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-4324765
Entity Address, Address Line One	870 North Commons Drive
Entity Address, City or Town	Aurora
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60504
City Area Code	630
Local Phone Number	375-6631
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	CCMP
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		29,036,385
Entity Central Index Key	0001102934
Current Fiscal Year End Date	--09-30
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3

XML

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue	$ 271,882	$ 150,437	$ 759,051	$ 433,394
Cost of sales	156,492	69,737	429,508	203,635
Gross profit	115,390	80,700	329,543	229,759
Operating expenses:
Research, development and technical	12,191	13,059	39,009	38,578
Selling, general and administrative	50,959	25,711	162,415	75,051
Total operating expenses	63,150	38,770	201,424	113,629
Operating income	52,240	41,930	128,119	116,130
Interest expense	12,757	513	32,978	2,803
Interest income	417	1,141	2,004	3,248
Other income (expense), net	(472)	486	(2,897)	113
Income before income taxes	39,428	43,044	94,248	116,688
Provision for income taxes	20,550	7,873	34,790	54,863
Net income	$ 18,878	$ 35,171	$ 59,458	$ 61,825
Basic earnings per share (in dollars per share)	$ 0.65	$ 1.37	$ 2.09	$ 2.42
Weighted average basic shares outstanding (in shares)	29,063,907	25,611,505	28,398,960	25,479,078
Diluted earnings per share (in dollars per share)	$ 0.64	$ 1.34	$ 2.06	$ 2.35
Weighted average diluted shares outstanding (in shares)	29,568,273	26,318,638	28,923,525	26,221,864

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 18,878	$ 35,171	$ 59,458	$ 61,825
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	2,699	(8,829)	4,132	2,276
Net unrealized loss on available-for-sale securities	0	(48)	0	(48)
Net unrealized loss on cash flow hedges	(9,044)		(15,518)
Net unrealized loss on cash flow hedges		(210)		(63)
Other comprehensive income (loss), net of tax	(6,345)	(9,087)	(11,386)	2,165
Comprehensive income	$ 12,533	$ 26,084	$ 48,072	$ 63,990

XML

CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Current assets:
Cash and cash equivalents	$ 168,678	$ 352,921
Accounts receivable, less allowance for doubtful accounts of $1,923 at June 30, 2019, and $1,900 at September 30, 2018	135,235	75,886
Inventories	145,783	71,926
Prepaid expenses and other current assets	25,296	22,048
Total current assets	474,992	522,781
Property, plant and equipment, net	266,391	111,403
Goodwill	708,390	101,083
Other intangible assets, net	838,034	35,202
Deferred income taxes	5,612	5,840
Other long-term assets	5,658	4,664
Total assets	2,299,077	780,973
Current liabilities:
Accounts payable	46,758	18,171
Current portion of long-term debt	13,313	0
Accrued expenses, income taxes payable and other current liabilities	95,261	82,983
Total current liabilities	155,332	101,154
Long-term debt, net of current portion, less prepaid debt issuance costs of $18,655 at June 30, 2019	930,370	0
Deferred income taxes	144,704	81
Other long-term liabilities	43,338	13,046
Total liabilities	1,273,744	114,281
Commitments and contingencies (Note 12)
Stockholders’ equity:
Common Stock: Authorized: 200,000,000 shares, $0.001 par value; Issued: 39,470,364 shares at June 30, 2019, and 35,862,465 shares at September 30, 2018	39	36
Capital in excess of par value of common stock	979,940	622,498
Retained earnings	494,009	471,673
Accumulated other comprehensive income (loss)	(6,847)	4,539
Treasury stock at cost, 10,447,011 shares at June 30, 2019, and 10,356,147 shares at September 30, 2018	(441,808)	(432,054)
Total stockholders’ equity	1,025,333	666,692
Total liabilities and stockholders’ equity	$ 2,299,077	$ 780,973

XML

CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 1,923	$ 1,900
Prepaid debt issuance cost	$ 18,655
Common stock, authorized (in shares)	200,000,000	200,000,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, issued (in shares)	36,470,364	35,862,465
Treasury stock (in shares)	10,447,011	10,356,147

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 59,458	$ 61,825
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	70,476	19,527
Provision for doubtful accounts	(75)	80
Share-based compensation expense	15,048	14,269
Deemed repatriation transition tax	0	24,641
Deferred income tax (expense) benefit	(16,760)	9,280
Non-cash foreign exchange (gain) loss	907	(1,340)
(Gain) loss on disposal of property, plant and equipment	(59)	45
Realized loss on the sale of available-for-sale securities	0
Realized loss on the sale of available-for-sale securities		117
Non-cash charge on inventory step up of acquired inventory sold	14,869	0
Amortization of debt issuance costs	2,086	441
(Gain) on sale of assets	0	(956)
Other	2,201	3,589
Changes in operating assets and liabilities:
Accounts receivable	6,187	(9,612)
Inventories	(19,477)	(5,526)
Prepaid expenses and other assets	10,831	(12,482)
Accounts payable	(1,558)	473
Accrued expenses, income taxes payable and other liabilities	(27,089)	(375)
Net cash provided by operating activities	117,045	103,996
Cash flows from investing activities:
Additions to property, plant and equipment	(32,691)	(15,245)
Acquisition of a business, net of cash acquired	(1,182,186)	0
Cash settlement of life insurance policy	3,959	0
Proceeds from the sale of assets	1,210	3,027
Purchases of available-for-sale securities	0
Purchases of available-for-sale securities		(178,412)
Proceeds from the sale and maturities of available-for-sale securities	0	55,194
Settlement of net investment hedge	0	(9,882)
Net cash used in investing activities	(1,209,708)	(145,318)
Cash flows from financing activities:
Repayment of long-term debt	(102,663)	(144,375)
Repurchases of common stock	(9,468)	(33,072)
Proceeds from issuance of long-term debt	1,062,337	0
Debt issuance costs	(18,745)	0
Proceeds from issuance of stock	11,349	20,297
Dividends paid	(34,132)	(20,507)
Net cash provided by (used in) financing activities	908,678	(177,657)
Effect of exchange rate changes on cash	(258)	7,213
Decrease in cash and cash equivalents	(184,243)	(211,766)
Cash and cash equivalents at beginning of period	352,921	397,890
Cash and cash equivalents at end of period	168,678	186,124
Supplemental disclosure of non-cash investing and financing activities:
Purchases of property, plant and equipment in accrued liabilities and accounts payable at the end of the period	3,085	1,588
Equity consideration related to the acquisition of KMG Chemicals, Inc	$ 331,048	$ 0

XML

CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Capital In Excess Of Par	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Balance at beginning of period at Sep. 30, 2017	$ 595,037	$ 35	$ 580,938	$ 397,881	$ 3,949	$ (387,766)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	5,881		5,881
Repurchases of common stock under share repurchase plans, at cost	(1,591)					(1,591)
Repurchases of common stock - other, at cost	(3,160)					(3,160)
Exercise of stock options	6,139		6,139
Issuance of Cabot Microelectronics restricted stock under Deposit Share Program	300		300
Net income	(3,083)			(3,083)
Dividends	(5,153)			(5,153)
Foreign currency translation adjustment	7,144				7,144
Interest rate swaps	199				199
Change in unrealized gain/(loss) in short term available-for-sale securities	(46)				(46)
Balance at end of period at Dec. 31, 2017	601,667	35	593,258	389,645	11,246	(392,517)
Balance at beginning of period at Sep. 30, 2017	595,037	35	580,938	397,881	3,949	(387,766)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	61,825
Foreign currency translation adjustment	2,276
Change in unrealized gain/(loss) in short term available-for-sale securities	(48)
Balance at end of period at Jun. 30, 2018	634,181	36	615,543	433,818	6,114	(421,330)
Balance at beginning of period at Dec. 31, 2017	601,667	35	593,258	389,645	11,246	(392,517)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	4,223		4,223
Repurchases of common stock under share repurchase plans, at cost	(5,005)					(5,005)
Repurchases of common stock - other, at cost	(300)					(300)
Exercise of stock options	9,612	1	9,611
Issuance of Cabot Microelectronics stock under Employee Stock Purchase Plan	2,012		2,012
Net income	29,737			29,737
Dividends	(10,390)			(10,390)
Foreign currency translation adjustment	3,961				3,961
Interest rate swaps	(52)				(52)
Sale of short term available-for-sale securities	46				46
Balance at end of period at Mar. 31, 2018	635,511	36	609,104	408,992	15,201	(397,822)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	4,236		4,236
Repurchases of common stock under share repurchase plans, at cost	(23,508)					(23,508)
Exercise of stock options	2,203		2,203
Net income	35,171			35,171
Dividends	(10,345)			(10,345)
Foreign currency translation adjustment	(8,829)				(8,829)
Interest rate swaps	(210)				(210)
Change in unrealized gain/(loss) in short term available-for-sale securities	(48)				(48)
Balance at end of period at Jun. 30, 2018	634,181	36	615,543	433,818	6,114	(421,330)
Balance at beginning of period at Sep. 30, 2018	666,692	36	622,498	471,673	4,539	(432,054)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	8,170		8,170
Repurchases of common stock - other, at cost	(4,001)					(4,001)
Exercise of stock options	3,097		3,097
Issuance of common stock in connection with acquisition of KMG Chemicals, Inc.	331,048	3	331,045
Issuance of Cabot Microelectronics restricted stock under Deposit Share Program	75		75
Net income	13,443			13,443
Dividends	(11,598)			(11,598)
Foreign currency translation adjustment	2,425				2,425
Minimum pension liability adjustment	(251)				(251)
Balance at end of period at Dec. 31, 2018	1,008,167	39	964,885	472,585	6,713	(436,055)
Balance at beginning of period at Sep. 30, 2018	666,692	36	622,498	471,673	4,539	(432,054)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	59,458
Foreign currency translation adjustment	4,132
Interest rate swap	(15,518)
Change in unrealized gain/(loss) in short term available-for-sale securities	0
Balance at end of period at Jun. 30, 2019	1,025,333	39	979,940	494,009	(6,847)	(441,808)
Balance at beginning of period at Dec. 31, 2018	1,008,167	39	964,885	472,585	6,713	(436,055)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	3,538		3,538
Repurchases of common stock - other, at cost	(694)					(694)
Exercise of stock options	5,080		5,080
Issuance of Cabot Microelectronics stock under Employee Stock Purchase Plan	2,109		2,109
Net income	27,137			27,137
Dividends	(12,255)			(12,255)
Foreign currency translation adjustment	(992)				(992)
Interest rate swap	(6,474)				(6,474)
Minimum pension liability adjustment	251				251
Balance at end of period at Mar. 31, 2019	1,025,867	39	975,612	487,467	(502)	(436,749)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	3,340		3,340
Repurchases of common stock under share repurchase plans, at cost	(5,001)					(5,001)
Repurchases of common stock - other, at cost	(58)					(58)
Exercise of stock options	988		988
Net income	18,878			18,878
Dividends	(12,336)			(12,336)
Foreign currency translation adjustment	2,699				2,699
Interest rate swap	(9,044)				(9,044)
Change in unrealized gain/(loss) in short term available-for-sale securities	0
Balance at end of period at Jun. 30, 2019	$ 1,025,333	$ 39	$ 979,940	$ 494,009	$ (6,847)	$ (441,808)

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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Dividends (in dollars per share)	$ 0.42	$ 0.40	$ 0.40	$ 0.20

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BACKGROUND AND BASIS OF PRESENTATION

9 Months Ended

Jun. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

BACKGROUND AND BASIS OF PRESENTATION

BACKGROUND AND BASIS OF PRESENTATION

Cabot Microelectronics Corporation (“Cabot Microelectronics”, “the Company”, “us”, “we”, or “our”') is a leading global supplier of consumable materials to semiconductor manufacturers and pipeline operators.  On November 15, 2018 (“Acquisition Date”), we completed our acquisition of KMG Chemicals, Inc. (“KMG”), which produces and distributes specialty chemicals and performance materials for the semiconductor, pipeline operations, energy industries and industrial wood preservation industries (“Acquisition”).  The Acquisition has extended and strengthened our position as one of the leading suppliers of consumable materials to the semiconductor industry and expands our portfolio with the addition of KMG’s businesses, which we believe enables us to be a leading global provider of performance products and services to the pipeline companies and energy industries. The Consolidated Financial Statements included in this Report on Form 10-Q include the financial results of KMG from the Acquisition Date. Subsequent to the Acquisition, we have operated our business within two reportable segments: Electronic Materials and Performance Materials. The Electronic Materials segment consists of our heritage CMP slurries and polishing pads businesses, as well as the KMG electronic chemicals business.  The Performance Materials segment includes KMG’s heritage pipeline performance and wood treatment businesses, and Cabot Microelectronics’ heritage QED business. For additional information, refer to Part 1, Item 1, “Business”, in our and KMG’s Annual Reports on Form 10-K for the fiscal year ended September 30, 2018 and July 31, 2018, respectively.

The unaudited Consolidated Financial Statements have been prepared by Cabot Microelectronics pursuant to the rules of the Securities and Exchange Commission (SEC) and accounting principles generally accepted in the United States of America (U.S. GAAP).  In the opinion of management, these unaudited Consolidated Financial Statements include all adjustments, consisting of normal recurring adjustments, necessary for the fair statement of Cabot Microelectronics’ financial position as of June 30, 2019, cash flows for the nine months ended June 30, 2019 and June 30, 2018, and results of operations for the three and nine months ended June 30, 2019 and June 30, 2018.  The Consolidated Balance Sheets as of September 30, 2018 were derived from audited financial statements. The results of operations for the three and nine months ended June 30, 2019 may not be indicative of results to be expected for future periods, including the fiscal year ending September 30, 2019.  Certain prior period amounts have been reclassified to conform to the current period presentation.  This Report on Form 10-Q does not contain all of the footnote disclosures from our annual financial statements and should be read in conjunction with the Consolidated Financial Statements and related notes thereto included in Cabot Microelectronics’ Annual Report on Form 10-K for the fiscal year ended September 30, 2018.

The Consolidated Financial Statements include the accounts of Cabot Microelectronics and its subsidiaries. All intercompany transactions and balances between the companies have been eliminated as of June 30, 2019.

USE OF ESTIMATES

The preparation of financial statements and related disclosures in conformity with U.S. GAAP requires management to make judgments, assumptions and estimates that affect the amounts reported in the Consolidated Financial Statements and accompanying notes. The accounting estimates that require management's most difficult and subjective judgments include, but are not limited to, those estimates related to bad debt expense, inventory valuation, impairment of long-lived assets, business combinations, goodwill, other intangible assets, share-based compensation, income taxes and contingencies. We base our estimates on historical experience, current conditions and on various other assumptions that we believe are reasonable under the circumstances. However, future events are subject to change and estimates and judgments routinely require adjustment. Actual results may differ from these estimates under different assumptions or conditions.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS

9 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS

Significant Accounting Policies and Estimates

Except for the discussion on revenue recognition below, no material changes have been made to the Company’s significant accounting policies disclosed in Note 2 of the Notes to the Consolidated Financial Statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2018.

REVENUE RECOGNITION

As of October 1, 2018, the Company began applying the provisions of Accounting Standards Codification 606-10, “Revenue from Contracts with Customers” (“ASC 606”), and all related applicable guidance using the modified retrospective method applied to those contracts that were not completed as of October 1, 2018.  The Company recognizes revenue under the core principle of depicting the transfer of control to the Company’s customers in an amount reflecting the consideration to which the Company expects to be entitled. In order to achieve that core principle, the Company applies the following five step approach: (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and, (5) recognize revenue when a performance obligation is satisfied.

Upon adoption of ASC 606, we recognized a $933 decrease to the opening balance of retained earnings, net of tax, due to the cumulative impact of adopting the new revenue standard. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods.  The Company changed its accounting policy for revenue recognition for customer incentives that provide free products and tiered pricing.  For free products, the new revenue standard requires that a portion of the transaction price be allocated to the free product and deferred until the product has been delivered.  We previously accrued for undelivered free product as a charge to cost of sales.  In prior fiscal years, in accordance with ASC 605, we did not consider prospective tiered pricing to represent a material right.

The cumulative effect of the changes made to our Consolidated Balance Sheet as of October 1, 2018 for the adoption of the new revenue standard was:

	Balance at September 30, 2018		Adjustments Due to ASC 606			Balance at October 1, 2018
Deferred income tax assets	$	5,840	$	261		$	6,101
Accrued expenses, income taxes payable and other current liabilities	82,983		(47		)	82,936
Other long-term liabilities	13,046		1,241			14,287
Retained earnings	$	471,673	$	(933	)	$	470,740

We have determined that the effect of applying the new revenue standard during the three and nine months ended June 30, 2019 was immaterial to our financial statements compared to revenue guidance in effect before the adoption of the new revenue standard.  As a result, for the three and nine months ended June 30, 2019, we are not disclosing the quantitative amount by which each financial statement line item is affected by the application of the new revenue standard.

As part of the adoption of ASU 606, the Company elected to use certain allowed practical expedients. For the Company’s contracts that have an original duration of one year or less as of the adoption date, the Company uses the practical expedient applicable to such contracts and does not consider the time value of money. Further, because of the short duration of these contracts, the Company has not disclosed the transaction price for the future performance obligations as of the end of each reporting period for contracts having an expected duration of one year or less.  See Note 3 of this Report on Form 10-Q for disaggregated revenue, the reconciliation of contract balances and transaction price allocation to remaining performance obligations for contracts expected to remain effective beyond one year.

Performance Obligations and Material Rights

At contract inception, the Company assesses the goods and services promised in its contracts with customers and identifies a performance obligation for each material promise to the customer.  A performance obligation is a promise in a contract to transfer a distinct good or service, or a bundle of goods or services, to the customer, and is the unit of accounting under ASC 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. A majority of the Company’s contracts have a single performance obligation which represents, in most cases, the products, equipment or services being sold to the customer. Some contracts include multiple performance obligations, including prospective tiered price discounts or delivery of free product that we have concluded represents a material right. Contracts with prospective tiered price discounts require judgment in determining if that discount represents a material right.

Contracts vary in length, and payment terms vary by the type and location of the Company’s customers and the products or services offered. However, the period of time between invoicing and when payment is due is typically not significant and has no significant financing components.  Customers pay in accordance with negotiated terms upon receipt of goods or completion of services.  For these contracts, the transaction price is determined upon establishment of the contract that contains the final terms of the sale, including the description, quantity, and price of goods or services purchased.  In certain instances, we receive consideration from a customer prior to transferring goods or services to the customer under the terms of a sales contract.  In such cases, we record deferred revenue until the performance obligation is satisfied, which represents a contract liability, and is included in the contract liabilities discussed in Note 3 of this Report on Form 10-Q.

The Company recognizes revenue related to product sales at a point in time following the transfer of control of such products to the customer, which generally occurs upon shipment, or delivery depending on the terms of the underlying contracts. The Company considers control to have transferred upon shipment or delivery because the Company has a present right to payment at that time, the customer has legal title to the asset, the Company has transferred physical possession of the asset, and the customer has significant risks and rewards of ownership of the asset.  Revenue is recognized on consignment sales when control transfers to the customer, generally at the point of customer usage of the product. The Company also records revenue for services provided to the pipeline and oilfield energy industries.  These services include preventive maintenance, repair and specialized isolation sealing on pipelines and training. Revenue is recorded at a point in time when the services are completed as this is when right to payment and customer acceptance occurs.

For sales contracts that contain multiple performance obligations, the Company allocates the transaction price to each performance obligation identified in the contract based on relative standalone selling prices or estimates of such prices.  Standalone selling price, once established, is then used to allocate total consideration proportionally to the various performance obligations within a contract. Most contracts where we have determined there to be multiple performance obligations relate to where we have identified the existence of a material right such that we provide prospective tiered pricing discounts or free product. When we invoice for products shipped under these contracts, we defer the revenue associated with these rights on the balance sheet as a contract liability. Revenue is recognized when the customer exercises the option to purchase goods at a discount in the case of the prospective tiered pricing discounts or when we ship the free product.

Variable Consideration

The primary type of variable consideration present in the Company’s contracts are rebates and early payment discounts, both of which are immaterial. Early payment discounts are offered on a limited basis and are not significant.  The Company also offers rebates based upon cumulative volume of purchases within a quarter and accrues for the rebate obligation within the quarter that the rebate is earned.  ASC 606 did not change the accounting for rebates under ASC 605.

Costs to Obtain and Fulfill a Contract

 For certain contracts within the Performance Materials segment, commissions are paid to sales agents based upon a percentage of end-customer invoice value. Agents are paid the commissions after funds are received by the Company from its customers.  Under ASC 340, sales commissions are required to be capitalized and expensed over the associated contract period.  However, as a practical expedient, the Company does not capitalize commissions as the associated contracts are generally one year or less in duration. For shipping and handling activities performed after a customer obtains control of the goods, the Company has elected to account for these costs as activities to fulfill the promise to transfer the goods and included in cost of sales.

EFFECTS OF RECENT ACCOUNTING PRONOUNCEMENTS

In February 2016, the FASB issued ASU No. 2016-02, "Leases" (Topic 842).  The provisions of ASU 2016-02 require a dual approach for lessee accounting under which a lessee would recognize a right-of-use asset and a corresponding lease liability.  Leases will be classified as either finance or operating leases.  For finance leases, a lessee will recognize interest expense and amortization of the right-of-use asset, and for operating leases, the lessee will recognize a straight-line total lease expense.  The guidance also requires qualitative and specific quantitative disclosures to supplement the amounts recorded in the financial statements, to afford better understanding of an entity's leasing activities, including any significant judgments and estimates.   The guidance was amended through various ASU's subsequent to ASU 2016-02, all of which will be effective for us beginning October 1, 2019, but early adoption is permitted.  We have finished reviewing the population of our lease contracts and are in the process of implementing a new third party lease software system. The Company currently plans to elect the optional package of practical expedients to not reassess prior conclusions related to contracts containing leases, lease classification and initial direct costs and therefore, does not expect the adoption of ASU 2016-02 to have a significant impact on the Consolidated Statements of Income. We expect to adopt the new standard in our first quarter of fiscal 2020 applying the optional transition method upon adoption. We continue to evaluate the amount of right-of-use asset and lease liability that will ultimately be recorded on the Consolidated Balance Sheets and the impact on the Consolidated Statements of Income.

In June 2016, the FASB issued ASU No. 2016-13, "Measurement of Credit Losses on Financial Instruments" (Topic 326). The provisions of this standard require financial assets measured at amortized cost to be presented at the net amount expected to be collected. An allowance account would be established to present the net carrying value at the amount expected to be collected. ASU 2016-13 also provides that credit losses relating to available-for-sale debt securities should be recorded through an allowance for credit losses. The guidance was amended through various ASU's subsequent to ASU 2016-13, all of which will be effective for us beginning October 1, 2020, but early adoption is permitted as of October 1, 2019. We are currently evaluating the impact of implementation of this standard on our financial statements.

In March 2017, the FASB issued ASU No. 2017-07 "Improving the Presentation of Net Period Pension Cost and Net Period Postretirement Benefit Cost" (Topic 715). The provisions of ASU 2017-07 provided specific guidance on the presentation of the components of net benefit cost.  We adopted this standard ASU 2017-07 effective October 1, 2018 and applied it retrospectively. Pursuant to the adoption, net service costs are recorded as fringe benefit expense under cost of sales and operating expenses, and all other costs are recorded in the Other income (expense), net in our Consolidated Statements of Income. The impact of the retrospective adoption in fiscal year 2018 is not material.

In May 2017, the FASB issued ASU No. 2017-09 "Scope of Modification Accounting" (Topic 718). The provisions of ASU 2017-09 provide specific guidance about which changes to the term or conditions of a share-based payment require an entity to apply modification accounting.  We adopted ASU 2017-09 effective October 1, 2018 and will apply this new standard to our share-based compensation awards, to the extent modified.

In August 2017, the FASB issued ASU No. 2017-12 "Derivatives and Hedging" (Topic 815). The provisions of this standard amend the hedge accounting model in ASC 815 to expand an entity's ability to hedge nonfinancial and financial risk components, reduce complexity in fair value hedges of interest rate risk, eliminate the requirement to separately measure and report hedge ineffectiveness, and generally require the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. The guidance also eases certain documentation and assessment requirements and modifies the accounting for components excluded from the assessment of hedge effectiveness.  We early adopted this guidance effective January 1, 2019, and we did not have any hedges that existed as of the initial application date.  We applied the new guidance to the interest rate swap that we entered into during our second quarter of fiscal 2019. Pursuant to the guidance, we performed initial quantitative hedge effectiveness testing upon the inception of the hedge, and determined the hedge to be highly effective.  Therefore, unrealized changes in fair value are recorded in other comprehensive income.  In addition, we reclassify the realized gains and losses out of other comprehensive income, and into interest expense in our Consolidated Statements of Income, which is the same financial statement line as the hedged item.  We will perform subsequent assessments of hedge effectiveness qualitatively on a quarterly basis.

In February 2018, the FASB issued ASU No. 2018-02 "Income Statement – Reporting Comprehensive Income (Topic 220)".  The amendments in this standard allow a company to reclassify the stranded tax effects resulting from the Tax Cuts and Jobs Act (the "Tax Act") from accumulated other comprehensive income to retained earnings. ASU 2018-02 will be effective for us beginning October 1, 2019, but early adoption is permitted. We are currently evaluating and quantifying the amount to be reclassified into retained earnings and expect to record the reclassification on October 1, 2019.

In June 2018, the FASB issued ASU No. 2018-07 " Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting."  The ASU simplified the accounting for share-based payments granted to nonemployees for goods and services, therefore guidance on such payments to nonemployees would be mostly aligned with the requirements for share-based payments granted to employees. ASU 2018-07 will be effective for us beginning October 1, 2019, but early adoption is permitted (but no earlier than the adoption date of Topic 606). We do not expect implementation of this standard to have material impact on our financial statements.

In August 2018, the FASB issued ASU No. 2018-13 " Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement".  The ASU provides specific guidance on various disclosure requirements in Topic 820, including removal, modification and addition to current disclosure requirements. ASU 2018-13 will be effective for us beginning October 1, 2020, but early adoption is permitted. We are currently evaluating the impact of implementation of this standard on our disclosures.

In August 2018, the FASB issued ASU No. 2018-15 " Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force)".  The ASU Requires an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. ASU 2018-15 will be effective for us beginning October 1, 2020, but early adoption is permitted. We are currently evaluating the impact of implementation of this standard on our financial statements.

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REVENUE FROM CONTRACTS WITH CUSTOMERS

9 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

REVENUE FROM CONTRACTS WITH CUSTOMERS

REVENUE FROM CONTRACTS WITH CUSTOMERS

Disaggregation of Revenue

The Company disaggregates revenue by product area and segment as it best depicts the nature and amount of the Company’s revenue.

The following table shows revenue generated by product area during the three and nine months ended June 30, 2019 and 2018:

	Three Months Ended June 30,				Nine Months Ended June 30,
	2019		2018		2019		2018
Revenue:
Electronic Materials:
CMP Slurries	$	108,617	$	122,893	$	345,244	$	352,414
Electronic Chemicals	80,103		—		198,474		—
CMP Pads	23,403		20,917		71,868		60,813
Total Electronic Materials	212,123		143,810		615,586		413,227
Performance Materials	59,759		6,627		143,465		20,167
Total revenue	$	271,882	$	150,437	$	759,051	$	433,394

Reconciliation of Contract Liability Balances

The following table provides information about contract liability balances:

	June 30, 2019		October 1, 2018
Contract liabilities (current)	$	3,958	$	5,310
Contract liabilities (noncurrent)	1,378		1,239

The contract liability balances as of October 1, 2018 in the table above include the amounts recorded upon the adoption of ASC 606.  At June 30, 2019, the current portion of contract liabilities of $3,958 is included in accrued liabilities, taxes payable and other current liabilities, and the noncurrent portion of $1,378 is included in other long-term liabilities in the Consolidated Balance Sheets.  The amount of revenue recognized during the three and nine months ended June 30, 2019 that was included in the opening current contract liability balances in our Performance Materials segment was $697 and $4,857, respectively.  The amount of revenue recognized during the three and nine months ended June 30, 2019 that was included in our opening contract liability balances in our Electronic Materials segment was not material.

Transaction Price Allocated to Remaining Performance Obligations

The table below discloses (1) the aggregate amount of the transaction price allocated to performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period for contracts with an original duration of greater than one year and (2) when the Company expects to recognize this revenue.

	Less Than 1 Year		1-3 Years		3-5 Years		Total
Revenue expected to be recognized on contract liability amounts as of June 30, 2019	$	211	$	975	$	403	$	1,589

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BUSINESS COMBINATION

9 Months Ended

Jun. 30, 2019

Business Combinations [Abstract]

BUSINESS COMBINATION

BUSINESS COMBINATION

On the Acquisition Date, the Company completed its acquisition of 100% of the outstanding stock of KMG, which was a publicly held company headquartered in Fort Worth, Texas. KMG specialized in producing, processing, and distributing electronic chemicals for the semiconductor industry and performance materials for the pipeline operations and energy, and industrial wood preservation industries. We acquired KMG to extend and strengthen our position as one of the leading suppliers of consumable materials to the semiconductor industry and to expand our portfolio with the addition of KMG’s performance materials businesses, which we believe enables us to become a leading global provider of performance products and services to the pipeline operations and energy industries. The purchase consideration was $1,513,235, including consideration transferred of $1,536,452, less cash acquired of $23,217. The consideration was comprised of cash consideration to KMG common shareholders and equity award holders, stock consideration to KMG common shareholders and equity award holders, and cash consideration in the form of the retirement of KMG’s preexisting debt obligations.  Under the terms of the definitive agreement to acquire KMG, each share of KMG common stock was converted into the right to receive $55.65 in cash and 0.2000 of a share of Cabot Microelectronics common stock. As a result, we issued 3,237,005 shares of our common stock to KMG’s common stockholders, with a stock price of $102.27 on the Acquisition Date. In connection with the Acquisition, we entered into a credit agreement (the “Credit Agreement”), which provided us with a seven-year, $1,065,000 term loan facility (the “Term Loan Facility”), which we drew on the Acquisition Date to fund the Acquisition along with cash on hand, and a five-year, $200,000 revolving credit facility (the “Revolving Credit Facility”), which has not been drawn. In connection with the borrowing, we incurred $21,408 in debt issuance costs and original issue discount fees, $859 of which relates to the Revolving Credit Facility and is recorded as a prepaid asset, and the remaining $20,549 in debt issuance costs relates to the Term Loan Facility and is presented as a reduction of long-term debt. These debt issuance costs are amortized and recorded in Interest expense in the Consolidated Statements of Income over the life of the Revolving Credit Facility and Term Loan Facility, respectively. See below for a summary of the different components that comprise the total consideration.

	Amount
Total cash consideration paid for KMG outstanding common stock and equity awards	$	900,756
Cash provided to payoff KMG debt	304,648
Total cash consideration paid	1,205,404
Fair value of Cabot Microelectronics common stock issued for KMG outstanding common stock and equity awards	331,048
Total consideration transferred	$	1,536,452

The following table summarizes the preliminary allocation of fair values of assets acquired and liabilities assumed as of the Acquisition Date.

	Amount
Cash	$	23,217
Accounts receivable	64,711
Inventories	68,963
Prepaid expenses and other current assets	14,798
Property, plant and equipment	147,398
Intangible assets	844,800
Other long-term assets	6,208
Accounts payable	(28,894		)
Accrued expenses and other current liabilities	(43,451		)
Deferred income taxes liabilities	(164,165		)
Other long-term liabilities	(3,754		)
Total identifiable net assets acquired	929,831
Goodwill	606,621
Total consideration transferred	$	1,536,452

The Acquisition was accounted for using the acquisition method of accounting. Tangible and identifiable intangible assets acquired and liabilities assumed are recorded at fair value as of the Acquisition Date. These valuations are preliminary based on the information currently available, and the expectations and assumptions that have been deemed reasonable by the Company’s management.  The Company has not finalized the fair value determinations of the assets acquired and liabilities assumed and expects to finalize such as soon as practicable, but not later than one-year from the Acquisition Date.  As a result, certain adjustments have been made and will continue to be made to the Company’s Consolidated Balance Sheet and Statements of Income.

The fair values of identifiable assets and liabilities acquired were developed with the assistance of a third-party valuation firm. The fair value of acquired property, plant and equipment is primarily valued at its “value-in-use.” The fair value of acquired identifiable intangible assets was determined using the “income approach” on an individual asset basis. The key assumptions used in the calculation of the discounted cash flows include projected revenue, gross margin, operating expenses, discount rate and customer attrition.  The valuations and the underlying assumptions have been deemed reasonable by the Company’s management. There are inherent uncertainties and management judgment required in these determinations.

The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the Acquisition Date:

	Fair Value		Estimated Useful Life (years)
Customer relationships	$	704,000	15-20
Technology and know-how	85,500		9-11
Trade name - Flowchem	46,000		Indefinite
Trade name - all other	7,000		1-15
EPA product registration rights	2,300		15
Total intangible assets	$	844,800

Customer relationships represent the estimated fair value of the underlying relationships and agreements with KMG’s customers and are being amortized on an accelerated basis in order for the expense to most accurately match the periods of highest cash flows attributable to the identified relationships. Technology and know-how represent the estimated fair value of KMG’s technology, processes and knowledge regarding its product offerings, and are being amortized on a straight-line basis. Trade names represent the estimated fair value of the brand and name recognition associated with the marketing of KMG’s product offerings and are being amortized on a straight-line basis, except for the Flowchem trade name, which we believe has an indefinite life. These intangible assets are capitalized and accounted for as indefinite-lived intangible assets and will be subject to impairment testing. The intangible assets subject to amortization have a weighted average useful life of 17.9 years.

The excess of consideration transferred over the fair value of net assets acquired was recorded as goodwill, and is not deductible for income tax purposes. The goodwill is primarily attributable to anticipated revenue growth from the combined company product portfolio, expected synergies of the combined company, and the assembled workforce of KMG. The preliminary allocation of goodwill to each of the Electronic Materials and Performance Materials segments as a result of the Acquisition was $261,733 and $344,888, respectively.

For the three and nine months ended June 30, 2019, we recorded $2,910 and $33,108 in acquisition and integration-related expenses, including transaction costs, stock compensation expense, severance and retention costs. These items are included within Selling, general and administrative in the Consolidated Statements of Income. In the same three and nine months ended June 30, 2019, we also recorded a charge of $42 and $14,869, respectively related to the fair value write-up of acquired inventory sold, which is included in Cost of sales in the Consolidated Statements of Income.

KMG’s results of operations have been included in our unaudited Consolidated Statements of Income and Consolidated Statements of Comprehensive Income from the Acquisition Date. Net sales of the acquired KMG business since the Acquisition Date through June 30, 2019 were $316,690. KMG’s net income since the Acquisition Date was $4,782, which includes $21,889 of acquisition-related costs and a $14,869 charge for fair value write-up of inventory sold. Further, additional amortization and depreciation expense associated with recording KMG’s net assets at fair value decreased KMG’s net income post-Acquisition.

The following unaudited supplemental pro forma information summarizes the combined results of operations for Cabot Microelectronics and KMG as if the Acquisition had occurred on October 1, 2017.

	Three Months Ended June 30,				Nine Months Ended June 30,
	2019		2018		2019		2018
Revenues	$	271,882	$	272,589	$	821,029	$	784,694
Net income (loss)	16,077		33,211		88,938		(1,369		)
Earnings per share - basic	$	0.55	$	1.15	$	3.07	$	(0.05	)
Earnings per share - diluted	$	0.54	$	1.12	$	3.02	$	(0.05	)

The following costs are included in the three and nine months ended June 30, 2018:

• Non-recurring transaction costs of $568 and $31,611, respectively.

• Non-recurring transaction-related employee costs, such as accelerated stock compensation expense, retention and severance expense of $1,380 and $37,392, respectively.

• Non-recurring charge for fair value write-up of inventory sold of $0 and $14,859, respectively.

The historical financial information has been adjusted by applying the Company’s accounting policies and giving effect to the pro forma adjustments, which consist of (i) amortization expense associated with identified intangible assets; (ii) depreciation of fixed asset step-up (for pre-acquisition periods only); (iii) accretion of inventory step-up value; (iv) the elimination of interest expense on pre-acquisition KMG debt and replacement of interest expense related to the acquisition-related financing; (v) transaction-related costs; (vi) accelerated share-based compensation expense (pre-acquisition periods only); (vii) retention and severance expense incurred as a direct result of the Acquisition; and (viii) an adjustment to tax-effect the aforementioned unaudited pro forma adjustments using an estimated weighted-average effective income tax rate of each entity and the jurisdictions to which the above adjustments relate. The pro forma consolidated results are not necessarily indicative of what the consolidated results actually would have been had the Acquisition been completed on October 1, 2017. The pro forma consolidated results do not purport to project future results of combined operations, nor do they reflect the expected realization of any revenue or cost synergies associated with the Acquisition.

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FAIR VALUE OF FINANCIAL INSTRUMENTS

9 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

FAIR VALUE OF FINANCIAL INSTRUMENTS

Fair value is defined as the price that would be received from the sale of an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.  The Financial Accounting Standards Board (“FASB”) established a three-level hierarchy for disclosure based on the extent and level of judgment used to estimate fair value.  Level 1 inputs consist of valuations based on quoted market prices in active markets for identical assets or liabilities.  Level 2 inputs consist of valuations based on quoted prices for similar assets or liabilities, quoted prices for identical assets or liabilities in an inactive market, or other observable inputs.  Level 3 inputs consist of valuations based on unobservable inputs that are supported by little or no market activity.

The following table presents financial instruments, other than long-term debt, that we measured at fair value on a recurring basis at June 30, 2019 and September 30, 2019.  See Note 10 for a detailed discussion of our long-term debt.  We have classified the following assets and liabilities in accordance with the fair value hierarchy set forth in the applicable standards.  In instances where the inputs used to measure the fair value of an asset fall into more than one level of the hierarchy, we have classified them based on the lowest-level input that is significant to the determination of the fair value. 

June 30, 2019	Level 1		Level 2		Level 3		Total Fair Value
Assets:
Cash and cash equivalents	$	168,678	$	—	$	—	$	168,678
Other long-term investments	1,411		—		—		1,411
Derivative financial instruments	—		$	8	—		8
Total assets	$	170,089	$	8	$	—	$	170,097
Liabilities:
Derivative financial instruments	—		20,217		—		20,217
Total liabilities	$	—	$	20,217	$	—	$	20,217

September 30, 2018	Level 1		Level 2		Level 3		Total Fair Value
Assets:
Cash and cash equivalents	$	352,921	$	—	$	—	$	352,921
Other long-term investments	1,137		—		—		1,137
Total assets	$	354,058	$	—	$	—	$	354,058
Liabilities:
Derivative financial instruments	—		339		—		339
Total liabilities	$	—	$	339	$	—	$	339

Our cash and cash equivalents consist of various bank accounts used to support our operations and investments in institutional money-market funds that are traded in active markets.  We invest only in AAA-rated, prime institutional money market funds, comprised of high quality, short-term fixed income securities. Our other long-term investments represent the fair value of investments under the Cabot Microelectronics Supplemental Employee Retirement Plan (SERP), which is a nonqualified supplemental savings plan.  The fair value of the investments is determined through quoted market prices within actively traded markets. Although the investments are allocated to individual participants and investment decisions are made solely by those participants, the SERP is a nonqualified plan.   Consequently, the Company owns the assets and the related offsetting liability for disbursement until a participant makes a qualifying withdrawal.  The long-term investment was adjusted to $1,411 in the third quarter of fiscal 2019 to reflect its fair value as of June 30, 2019.

Our derivative financial instruments include foreign exchange contracts and an interest rate swap.  During the second quarter, we entered into a floating-to-fixed interest rate swap agreement to hedge the variability in LIBOR-based interest payments on a portion of our outstanding variable rate debt.  The fair value of our derivative instruments is estimated using standard valuation models and market-based observable inputs over the contractual term, including one-month LIBOR-based yield curves for the interest rate swap, and forward rates and/or the Overnight Index Swap (OIS) curve for forward foreign exchange contracts, among others.  We consider the risk of nonperformance, including counterparty credit risk, in the calculation of the fair value of derivative financial instruments.  See Note 11 of this Report on Form 10-Q for more information on our use of derivative financial instruments.

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INVENTORIES

9 Months Ended

Jun. 30, 2019

Inventory Disclosure [Abstract]

INVENTORIES

INVENTORIES

Inventories consisted of the following:

	June 30, 2019		September 30, 2018
Raw materials	$	59,684	$	35,150
Work in process	13,119		8,117
Finished goods	72,980		28,659
Total	$	145,783	$	71,926

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GOODWILL AND OTHER INTANGIBLE ASSETS

9 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill was $708,390 as of June 30, 2019, and $101,083 as of September 30, 2018.  The increase in goodwill was due to $606,621 in goodwill related to the Acquisition offset by $686 in foreign exchange fluctuations.  The amount of goodwill assigned to each of the Electronic Materials and Performance Materials segments was $358,108 and $350,282, respectively.

The components of other intangible assets are:

	June 30, 2019				September 30, 2018
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Other intangible assets subject to amortization:
Product technology, trade secrets and know-how	$	134,415	$	34,598	$	48,825	$	25,305
Acquired patents and licenses	10,570		8,356		8,270		8,252
Customer relationships, trade names, and distribution rights	740,058		51,225		28,068		17,574
Total other intangible assets subject to amortization	885,043		94,179		85,163		51,131
Other intangible assets not subject to amortization:
Other indefinite-lived intangibles*	47,170				1,170
Total other intangible assets not subject to amortization	47,170				1,170
Total other intangible assets	$	932,213	$	94,179	$	86,333	$	51,131

*Other indefinite-lived intangible assets not subject to amortization consist primarily of trade names.

As discussed in Note 4 of this Report on Form 10-Q, we recorded $844,800 of intangible assets related to the Acquisition.  The allocation of the amount into the various categories of intangible assets, as well as useful lives we have established, are discussed in Note 4.

Amortization expense on our intangible assets was $16,926 and $43,244 for the three and nine months ended June 30, 2019, respectively, and was $1,780 and $5,716 for the three and nine months ended June 30, 2018, respectively. Estimated future amortization expense for the five succeeding fiscal years is as follows:

Fiscal Year	Estimated Amortization Expense
Remainder of 2019	$	16,931
2020	87,940
2021	87,243
2022	79,832
2023	67,674

Goodwill and indefinite-lived intangible assets are tested for impairment annually in the fourth quarter of our fiscal year or more frequently if indicators of potential impairment exist, using a fair-value-based approach. The recoverability of goodwill is measured at the reporting unit level, which is defined as either an operating segment or one level below an operating segment. An entity has the option to assess the fair value of a reporting unit either using a qualitative analysis ("step zero") or a quantitative analysis ("step one"). Similarly, an entity has the option to use a step zero or a step one approach to determine the recoverability of indefinite-lived intangible assets. In 2018, we chose to use a step one analysis for both goodwill impairment and for indefinite-lived intangible asset impairment, with the exception of our CMP slurries reporting unit, for which we chose to use a step zero analysis for fiscal 2018.

We completed our annual impairment test during our fourth quarter of fiscal 2018 and concluded that no impairment existed.  There were no indicators of potential impairment during the quarter ended June 30, 2019, so it was not necessary to perform an impairment review for goodwill and indefinite-lived intangible assets during the quarter.  There have been no impairment charges recorded on the goodwill for any of our reporting units.

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OTHER LONG-TERM ASSETS

9 Months Ended

Jun. 30, 2019

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

OTHER LONG-TERM ASSETS

OTHER LONG-TERM ASSETS

Other long-term assets consisted of the following:

	June 30, 2019		September 30, 2018
Long-term contract assets	674		1,548
Long-term SERP Investment	1,411		1,137
Prepaid unamortized debt issuance cost - revolver	752		—
Other long-term assets	2,821		1,979
Total	$	5,658	$	4,664

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ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES

9 Months Ended

Jun. 30, 2019

Payables and Accruals [Abstract]

ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES

ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES

Accrued expenses, income taxes payable and other current liabilities consisted of the following:

	June 30, 2019		September 30, 2018
Accrued compensation	$	31,362	$	35,367
Income taxes payable	14,418		18,045
Dividends payable	12,879		10,822
Taxes, other than income taxes	6,806		1,976
KMG - Bernuth warehouse fire related (See Note 12)	4,450		—
Accrued interest	3,677		—
Contract liabilities	3,958		4,894
Goods and services received, not yet invoiced	3,772		1,954
Other accrued expenses	13,939		9,925
Total	$	95,261	$	82,983

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DEBT

9 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

DEBT

DEBT

On the Acquisition Date, we entered into the Credit Agreement by and among the Company, the lenders party thereto and JPMorgan Chase Bank, N.A., as administrative agent, which provides for senior secured financing of up to $1,265.0 million, consisting of the Term Loan Facility in an aggregate principal amount of $1,065.0 million and the Revolving Credit Facility in an aggregate principal amount of up to $200.0 million, including a letter of credit sub-facility of up to $50.0 million.  The Term Loan Facility and the Revolving Credit Facility are referred to as the “Credit Facilities.”

Proceeds of the loans borrowed under the Term Loan Facility on the Acquisition Date were used to fund, in part, the Acquisition and certain of KMG’s existing indebtedness, and to pay related fees and expenses. The Revolving Credit Facility remains undrawn.

The Credit Facilities are guaranteed by each of the Company’s wholly-owned domestic subsidiaries, including KMG and its subsidiaries, and are secured by substantially all assets of the Company and of each subsidiary guarantor, in each case subject to certain exceptions.

Borrowings under the Credit Facilities bear interest at a rate per annum equal to, at the Company’s option, either (a) a LIBOR, subject to a 0.00% floor, or (b) a base rate, in each case plus an applicable margin of, in the case of borrowings under the Term Loan Facility, 2.25% for LIBOR loans and 1.25% for base rate loans and, in the case of borrowings under the Revolving Credit Facility, initially, 1.50% for LIBOR loans and 0.50% for base rate loans. The applicable margin for borrowings under the Revolving Credit Facility varies depending on the Company’s first lien secured net leverage ratio. The Company is also required to pay a commitment fee currently equal to 0.25% per annum to the lenders under the Revolving Credit Facility in respect of the unutilized commitments thereunder. The commitment fee under the Revolving Credit Facility varies depending on the Company’s first lien secured net leverage ratio.

The Term Loan Facility matures on November 15, 2025, the seven-year anniversary of the Acquisition Date, and amortizes in equal quarterly installments of 0.25% of the initial principal amount, starting with the first full fiscal quarter after the Acquisition Date. The Revolving Facility matures on November 15, 2023, the five-year anniversary of the Acquisition Date. In addition, the Company is required to prepay outstanding loans under the Term Loan Facility, subject to certain exceptions, with up to 50% of the Company’s annual excess cash flow, as defined under the Credit Agreement, and 100% of the net cash proceeds of certain recovery events and non-ordinary course asset sales.

The Company may generally prepay outstanding loans under the Credit Facilities at any time, without prepayment premium or penalty, subject to customary “breakage” costs with respect to LIBOR rate loans.  We made a prepayment of $55.0 million and a total prepayment of $100.0 million during the three and nine months ended June 30, 2019, respectively.

The Revolving Credit Facility requires that the Company maintain a maximum first lien secured net leverage ratio, as defined in the Credit Agreement, of 4.00 to 1.00 as of the last day of each fiscal quarter if any revolving loans are outstanding, commencing with the first full fiscal quarter after the Acquisition Date.

The Credit Agreement contains certain affirmative and negative covenants that limit the ability of the Company, among other things and subject to certain significant exceptions, to incur debt or liens, make investments, enter into certain mergers, consolidations, asset sales and acquisitions, pay dividends and make other restricted payments and enter into transactions with affiliates. We believe we are in compliance with these covenants.

The Credit Agreement contains certain events of default, including relating to a change of control. If an event of default occurs, the lenders under the Credit Facilities will be entitled to take various actions, including the acceleration of amounts due under the Credit Facilities.

At June 30, 2019, the fair value of the Term Loan Facility, using level 2 inputs, approximated its carrying value of $962,338 as the loan bears a floating market rate of interest. As of June 30, 2019, $13,313 of the debt outstanding was classified as short-term, and $18,655 of debt issuance costs related to our Term Loan were presented as a reduction of long-term debt.

In the second quarter of fiscal 2019, we entered into a floating-to-fixed interest rate swap agreement to hedge the variability in our LIBOR-based interest payments on approximately 70% of our Term Loan Facility balance.  See Note 11 in this Report on Form 10-Q for additional information.

Principal repayments of the Term Loan Facility are generally made on the last calendar day of each quarter if that day is considered to be a business day.  As of June 30, 2019, scheduled principal repayments of the Term Loan were:

Fiscal Year	Principal Repayments
Remainder of 2019	$	5,325
2020	10,650
2021	10,650
2022	10,650
2023	10,650
Greater than 5 years	914,413
Total	$	962,338

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DERIVATIVE FINANCIAL INSTRUMENTS

9 Months Ended

Jun. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVE FINANCIAL INSTRUMENTS

DERIVATIVE FINANCIAL INSTRUMENTS

We are exposed to various market risks, including risks associated with interest rates and foreign currency exchange rates.  We enter into certain derivative transactions to mitigate the volatility associated with these exposures.  We have policies in place that define acceptable instrument types we may enter into and we have established controls to limit our market risk exposure.  We do not use derivative financial instruments for trading or speculative purposes.  In addition, all derivatives, whether designated in hedging relationships or not, are required to be recorded on the Consolidated Balance Sheets at fair value on a gross basis.

Cash Flow Hedges - Interest Rate Swap Agreement

During the second quarter, we entered into a floating-to-fixed interest rate swap agreement to hedge the variability in LIBOR-based interest payments on a portion of our outstanding variable rate debt.  As of June 30, 2019, the notional value of the swap was $746,000 and this value is scheduled to decrease bi-annually, and to expire on January 31, 2024.

We have designated this swap agreement as a cash flow hedge pursuant to ASC 815, "Derivatives and Hedging".  Based on certain quantitative and qualitative assessments, we have determined that the hedge is highly effective and qualifies for hedge accounting.  Accordingly, unrealized gains and losses on the hedge are recorded in other comprehensive income.  Realized gains and losses are recorded on the same financial statement line as the hedged item, which is Interest expense.

Foreign Currency Contracts Not Designated as Hedges

On a regular basis, we enter into forward foreign exchange contracts in an effort to mitigate the risks associated with currency fluctuations on certain foreign currency balance sheet exposures.  These foreign exchange contracts do not qualify for hedge accounting; therefore, the gains and losses resulting from the impact of currency exchange rate movements on our forward foreign exchange contracts are recognized as Other income (expense), net in the accompanying Consolidated Statements of Income in the period in which the exchange rates change.  As of June 30, 2019 and September 30, 2018, the notional amounts of the forward contracts we held to purchase U.S. dollars in exchange for foreign currencies were $9,636 and $7,652, respectively, and the notional amounts of forward contracts we held to sell U.S. dollars in exchange for foreign currencies were $17,880 and $24,860, respectively.

Net Investment Hedge - Foreign Exchange Contracts

In September 2017, we entered into forward contracts to sell 100 billion Korean won and buy U.S. dollars, which we subsequently terminated in the third quarter of fiscal 2018. We had designated these forward contracts as effective net investment hedges.

The fair value of our derivative instruments included in the Consolidated Balance Sheets, which was determined using Level 2 inputs, was:

		Derivative Assets				Derivative Liabilities
	Consolidated Balance Sheet Location	June 30, 2019		September 30, 2018		June 30, 2019		September 30, 2018
Derivatives designated as hedging instruments
Interest rate swap contract	Accrued expenses, income taxes payable and other current liabilities	$	—	$	—	$	4,274	$	—
	Other long-term liabilities	—		$	—	$	15,753	$	—
Derivatives not designated as hedging instruments
Foreign exchange contracts	Prepaid expenses and other current assets	$	8	$	—	$	—	$	—
	Accrued expenses, income taxes payable and other current liabilities	$	—	$	—	$	190	$	339

The following table summarizes the effect of our derivative instruments on our Consolidated Statements of Income for the three and nine months ended June 30, 2019 and 2018:

		(Loss) Recognized in Statement of Income
		Three Months Ended						Nine Months Ended
	Statement of Income Location	June 30, 2019			June 30, 2018			June 30, 2019			June 30, 2018
Derivatives not designated as hedging instruments
Foreign exchange contracts	Other income (expense), net	$	(29	)	$	(1,080	)	$	(67	)	$	(1,002	)

The interest rate swap agreement has been deemed to be effective, and realized gains and losses were immaterial to our Consolidated Statement of Income.  We recorded an unrealized loss of $15,536, net of tax, in Accumulated comprehensive income during the nine months ended June 30, 2019 for this interest rate swap.  As of June 30, 2019, during the next 12 months, we expect approximately $4,274 to be reclassed from Accumulated other comprehensive income (loss) into Interest expense related to our interest rate swap based on projected rates of the LIBOR forward curve as of June 30, 2019.

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COMMITMENTS AND CONTINGENCIES

9 Months Ended

Jun. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

LEGAL PROCEEDINGS AND OTHER CONTINGENCIES

We periodically become a party to legal proceedings, arbitrations, and regulatory proceedings (“contingencies”) arising in the ordinary course of our business operations. The ultimate resolution of these contingencies is subject to significant uncertainty, and should we fail to prevail in any of them or should several of them be resolved against us in the same reporting period, these matters could, individually or in the aggregate, be material to our consolidated financial statements. One of these contingencies, related to Star Lake Canal, which we assumed in connection with the Acquisition, is discussed below. The ultimate outcome of these matters, however, cannot be determined at this time, nor can the amount of any potential loss be reasonably estimated, and as a result except where indicated no amounts have been recorded in our consolidated financial statements.  The Company records legal costs associated with loss contingencies as expenses in the period in which they are incurred.

On May 31, 2019, a fire occurred at the warehouse of the facility of KMG’s subsidiary, KMG-Bernuth, in Tuscaloosa, Alabama, which processes pentachlorophenol (“penta”) for sale to customers in the United States and Canada. The warehouse fire, which we believe originated from non-hazardous waste materials temporarily stored in the warehouse for recycling purposes, caused no injuries and was extinguished in less than an hour. Company personnel investigated the incident, and KMG-Bernuth commenced cleanup with oversight from certain local, state and federal authorities. The carrying value of the warehouse and the affected inventory are not material. Applying the accounting guidance under ASC 410-30, Environmental Obligations and ASC 450, Contingencies, we determined that since we have environmental obligations as of the date of the fire, costs for the fire waste cleanup and disposal should be recognized to the extent they are probable and reasonably estimable. We have applied these criteria and recorded an undiscounted amount of $4,200 loss contingency regarding disposal costs that can be reasonably estimated at this time. These disposal costs were charged to Cost of sales. There are potential additional disposal and other costs that cannot be reasonably estimated as of this time related to materials in the warehouse or otherwise impacted by the incident. We will continue to update the estimated losses as new information becomes available. We also recognized $250 in Selling, general and administrative expense for professional fees incurred during the quarter related to the incident.

In addition, we are working with our insurance carriers on possible recovery of losses and costs, but at this point we cannot reasonably estimate whether we will receive, or the amount of, any potential insurance recoveries. As such, no insurance recoveries have been recognized as of June 30, 2019.

Separately, the United States Environmental Protection Agency (“EPA”) has notified KMG-Bernuth, that the EPA considered it to be a potentially responsible party under the Comprehensive Environmental Response, Compensation and Liability Act of 1980, as amended (“CERCLA”) by virtue of its relationship with certain alleged predecessor companies, including Idacon, Inc (f/k/a Sonford Chemical Company) in connection with the Star Lake Canal Superfund Site near Beaumont, Texas. The EPA has estimated that the remediation will cost approximately $22.0 million. KMG-Bernuth and approximately seven other parties entered into an agreement with the EPA in September 2016 to complete a remedial design phase of the remediation of the site. The remediation work will be performed under a separate future agreement. Although KMG-Bernuth has not conceded liability, a reserve in connection with the remedial design has been established, and as of June 30, 2019, the reserve remaining was $1,008.

We also may face other governmental or third-party claims, or otherwise incur costs, relating to cleanup of, or for injuries resulting from, contamination at sites associated with this or other past and present operations. We accrue for environmental liabilities when a determination can be made that they are probable and reasonably estimable. Other than as described herein, we are not involved in any legal proceedings that we believe could have a material impact on our consolidated financial position, results of operations or cash flows.

In addition, our Company is subject to extensive federal, state and local laws, regulations and ordinances in the U.S. and in other countries. These regulatory requirements relate to the use, generation, storage, handling, emission, transportation and discharge of certain hazardous materials, substances and waste into the environment.  The Company, including its KMG entities, manage Environmental, Health and Safety (“EHS”) matters related to protection of the environment and human health, the cleanup of contaminated sites, the treatment, storage and disposal of wastes, and the emission of substances into the air or waterways, among other EHS concerns.  Governmental authorities have the power to enforce compliance with their regulations, and violators may be subject to fines, injunctions or both. The Company devotes significant financial resources to compliance, including costs for ongoing compliance.

Certain licenses, permits and product registrations are required for the Company’s products and operations in the U.S., Mexico and other countries in which it does business. The licenses, permits and product registrations are subject to revocation, modification and renewal by governmental authorities.  In the U.S.  in particular, producers and distributors of penta, which is a product manufactured and sold by KMG-Bernuth as part of the wood treatment business, are subject to registration and notification requirements under the Federal Insecticide, Fungicide and Rodenticide Act (“FIFRA”) and comparable state law in order to sell this product in the U.S. Compliance with these requirements may have a significant effect on our business, financial condition and results of operations.

We are subject to contingencies, including litigation relating to EHS laws and regulations, commercial disputes and other matters. Certain of these contingencies are discussed above and below. The ultimate resolution of these contingencies is subject to significant uncertainty, and should we fail to prevail in any of them or should several of them be resolved against us in the same reporting period, these matters could, individually or in the aggregate, be material to the consolidated financial statements. The ultimate outcome of these matters, however, cannot be determined at this time, nor can the amount of any potential loss be reasonably estimated, and as a result except where indicated no amounts have been recorded in our consolidated financial statements. The Company records legal costs associated with loss contingencies as expenses in the period in which they are incurred.

Refer to Note 17 of “Notes to the Consolidated Financial Statements” in Item 8 of Part II of our Annual Report on Form 10-K for the fiscal year ended September 30, 2018, for additional information regarding commitments and contingencies.

POSTRETIREMENT OBLIGATIONS IN FOREIGN JURISDICTIONS

We have defined benefit plans covering employees in certain foreign jurisdictions as required by local law, which are unfunded. We adopted ASU 2017-7 during the first quarter of the fiscal year and pursuant to the adoption, net service costs are recorded as fringe benefit expense under Cost of sales and Operating expenses, and all other costs are recorded in the Other income (expense), net in our Consolidated Statements of Income.  The projected benefit obligations and accumulated benefit obligations under all such unfunded plans are updated annually during the fourth quarter of the fiscal year. Benefit payments under all such unfunded plans to be paid over the next ten years are expected to be approximately $7,906.  For more information regarding these plans, refer to Note 17 of “Notes to the Consolidated Financial Statements” included in Item 8 of Part II of our Annual Report on Form 10-K for the fiscal year ended September 30, 2018.

PURCHASE OBLIGATIONS

Purchase obligations include take-or-pay arrangements with suppliers, and purchase orders and other obligations entered into in the normal course of business regarding the purchase of goods and services.  We have been operating under a fumed silica supply agreement with Cabot Corporation, our former parent company which is not a related party, the current term of which runs through December 2019.  As of June 30, 2019, purchase obligations include $8,859 of contractual commitments related to this agreement.

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

9 Months Ended

Jun. 30, 2019

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The table below summarizes the components of accumulated other comprehensive income (loss) (AOCI), net of tax provision/(benefit), as of June 30, 2019 and 2018:

	Foreign Currency Translation		Cash Flow Hedges			Pension and Other Postretirement Liabilities			Total
Balance at September 30, 2018	$	5,918	$	(17	)	$	(1,362	)	$	4,539
Foreign currency translation adjustment, net of tax of $564	4,132		—			—			4,132
Unrealized gain (loss) on cash flow hedges:
Change in fair value, net of tax of $(4,500)	—		(15,487		)	—			(15,487		)
Reclassification adjustment into earnings, net of tax of $(9)	—		(31		)	—			(31		)
Balance at June 30, 2019	$	10,050	$	(15,535	)	$	(1,362	)	$	(6,847	)

	Foreign Currency Translation		Cash Flow Hedges			Pension and Other Postretirement Liabilities			Available-for-Sale Securities			Total
Balance at September 30, 2017	$	5,239	$	46		$	(1,336	)	$	—		$	3,949
Foreign currency translation adjustment, net of tax of $(2,303)	2,276		—			—						2,276
Unrealized loss on available-for-sale securities, net of tax of $0	—		—			—			(48		)	(48		)
Unrealized gain (loss) on cash flow hedges:
Change in fair value, net of tax of $111	—		319			—						319
Reclassification adjustment into earnings, net of tax of $(133)	—		(382		)	—						(382		)
Balance at June 30, 2018	$	7,515	$	(17	)	$	(1,336	)	$	(48	)	$	6,114

The before tax amount reclassified from AOCI to net income during the three and nine months ended June 30, 2019 and 2018, related to cash flow hedges, were recorded as Interest expense on our Consolidated Statement of Income.

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SHARE-BASED COMPENSATION PLANS

9 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement [Abstract]

SHARE-BASED COMPENSATION PLANS

SHARE-BASED COMPENSATION PLANS

We issue share-based awards under the following programs: our Cabot Microelectronics Corporation 2012 Omnibus Incentive Plan, as amended effective March 7, 2017 (OIP); our Cabot Microelectronics Corporation 2007 Employee Stock Purchase Plan, as Amended and Restated January 1, 2010 (ESPP); and, pursuant to the OIP, our Directors' Deferred Compensation Plan, as amended September 23, 2008 (DDCP), and our 2001 Executive Officer Deposit Share Program (DSP).  In March 2017, our stockholders reapproved the material terms of performance-based awards under the OIP for purposes of complying with Section 162(m) of the Internal Revenue Code of 1986, as amended.  For additional information regarding these programs, refer to Note 12 of "Notes to the Consolidated Financial Statements" included in Item 8 of Part II of our Annual Report on Form 10-K for the fiscal year ended September 30, 2018. 

We record share-based compensation expense for all share-based awards, including stock option grants, and restricted stock, restricted stock unit and performance share unit ("PSU") awards, and employee stock purchase plan purchases.  We calculate share-based compensation expense using the straight-line approach based on awards ultimately expected to vest, which requires the use of an estimated forfeiture rate.  Our estimated forfeiture rate is primarily based on historical experience, but may be revised in future periods if actual forfeitures differ from the estimate.  We use the Black-Scholes option-pricing model to estimate the grant date fair value of our stock options and employee stock purchase plan purchases.  This model requires the input of highly subjective assumptions, including the price volatility of the underlying stock, the expected term of our stock options, expected dividend yield and the risk-free interest rate.  We estimate the expected volatility of our stock options based on a combination of our stock's historical volatility and the implied volatilities from actively-traded options on our stock.  We calculate the expected term of our stock options using historical stock option exercise data, and for stock option grants made prior to December 2017, we have added a slight premium to this expected term for employees who meet the definition of retirement-eligible pursuant to their stock option grants during the contractual term of the grant.  As of December 2017, the provisions of stock option grants and restricted stock unit awards stated that, except in certain circumstances including termination for cause, once an employee meets the retirement eligibility requirements, any remaining unvested share-based awards will continue to vest regardless of termination of service. Consequently, the requisite service period for the award is satisfied upon retirement eligibility. Therefore, we record the total share-based compensation expense upon award for those employees who have met the retirement eligibility at the grant date. The expected dividend yield represents our annualized dividend in dollars divided by the stock price on the date of grant.  The risk-free interest rate is derived from the U.S. Treasury yield curve in effect at the time of grant.

The PSUs that have been awarded may be subject to downward or upward adjustment depending on the total shareholder return achieved by the Company during the particular performance period related to the PSUs, relative to the total shareholder return of an established market index.  We use a third-party service provider to estimate the fair value of the PSUs at grant date by using a Monte Carlo simulation model. This model simulates the stock price movements of the Company and Index constituents using certain assumptions, including the stock price of the Company and index constituents, the risk-free interest rate and stock price volatility.  Subsequent to the Acquisition, the performance metrics of the PSUs awarded in December 2017 were modified to reflect the performance results expected due to the Acquisition.

KMG awards granted subsequent to the entry into the definitive agreement for the Acquisition, but prior to the Acquisition Date, were converted to our restricted stock units (“Replacement Award”), with vesting in three equal installments on the first three anniversaries of the original award date. If the recipient is terminated without cause or resigns with good reason during the 18 months following the Acquisition Date, the Replacement Award will vest as of such termination date in a number of shares equal to 150% of the Replacement Award. The share-based compensation expense related to the Replacement Awards, including accelerated vesting, was $3,253 in the first quarter of fiscal 2019 and not material in the second and third quarters of fiscal 2019. The expense was included in the table below.

Share-based compensation expense for the three and nine months ended June 30, 2019 and 2018, was as follows:

	Three Months Ended June 30,						Nine Months Ended June 30,
	2019			2018			2019			2018
Cost of sales	$	540		$	542		$	2,169		$	1,896
Research, development and technical	390			445			1,733			1,491
Selling, general and administrative	2,410			3,199			11,146			10,882
Total share-based compensation expense	3,340			4,186			15,048			14,269
Tax benefit	(670		)	(1,023		)	(3,121		)	(3,272		)
Total share-based compensation expense, net of tax	$	2,670		$	3,163		11,927			$	10,997

For additional information regarding the estimation of fair value, refer to Note 12 of "Notes to the Consolidated Financial Statements" included in Item 8 of Part II of our Annual Report on Form 10-K for the fiscal year ended September 30, 2018.

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INCOME TAXES

9 Months Ended

Jun. 30, 2019

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The Company’s effective income tax rate was 52.1% and 36.9% for the three and nine months ended June 30, 2019, respectively, compared to an effective income tax rate of 18.3% and 47.0% for the three and nine months ended June 30, 2018, respectively. In the third quarter of fiscal 2019, the Company recorded a discrete charge of $9,128 related to newly issued final regulations related to U.S. Tax Reform which impacted the Company’s reserves for uncertain tax positions. Other factors that impacted the Company’s effective income tax rate for the nine months ended June 30, 2019 were primarily related to unfavorable tax treatment of certain KMG acquisition-related costs, such as compensation deduction limitations, as well as non-deductibility of certain professional fees.  Additionally, we recorded incremental tax expense for the Global Intangible Low Taxed Income (“GILTI”) provision of the Tax Act, which was effective for the first time during our fiscal 2019. Partially offsetting these adverse items, the Tax Act reduced the corporate income tax rate to 21.0% effective January 1, 2018, resulting in a change in our blended tax rate of 24.5% in fiscal 2018 to 21.0% beginning with our fiscal 2019.  In the quarter ended December 31, 2018, the Company completed its provisional estimates with regard to the Tax Act, and the Transition Tax and Withholding Tax obligations are now determined to be complete.

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EARNINGS PER SHARE

9 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

EARNINGS PER SHARE

EARNINGS PER SHARE

Basic earnings per share (EPS) is calculated by dividing net income available to common stockholders by the weighted-average number of common shares outstanding during the period, excluding the effects of unvested restricted stock awards that have a right to receive non-forfeitable dividends, which are considered participating securities as prescribed by the two-class method under ASC 260 “Earnings per Share”.  Beginning in the first quarter of fiscal 2019, the amount of participating securities was no longer material and therefore, we have excluded such securities from our calculation of EPS in fiscal 2019.  Diluted EPS is calculated in a similar manner, but the weighted-average number of common shares outstanding during the period is increased to include the weighted-average dilutive effect of “in-the-money” stock options and unvested restricted stock shares using the treasury stock method.

The standards of accounting for earnings per share require companies to provide a reconciliation of the numerator and denominator of the basic and diluted earnings per share computations.  Basic and diluted earnings per share were calculated as follows:

	Three Months Ended June 30,					Nine Months Ended June 30,
	2019		2018			2019		2018
Numerator:
Net Income	$	18,878	$	35,171		$	59,458	$	61,825
Less: income attributable to participating securities	—		(34		)	—		(73		)
Earnings available to common shares	$	18,878	$	35,137		$	59,458	$	61,752
Denominator:
Weighted average common shares	29,063,907		25,611,505			28,398,960		25,479,078
(Denominator for basic calculation)
Weighted average effect of dilutive securities:
Share-based compensation	504,366		707,133			524,565		742,786
Diluted weighted average common shares	29,568,273		26,318,638			28,923,525		26,221,864
(Denominator for diluted calculation)
Earnings per share:
Basic	$	0.65	$	1.37		$	2.09	$	2.42
Diluted	$	0.64	$	1.34		$	2.06	$	2.35

Approximately 0.1 million and 0.2 million shares for the three and nine months ended June 30, 2019, respectively, and 0.1 million shares for both the three and nine months ended June 30, 2018, attributable to outstanding stock options were excluded from the calculation of diluted earnings per share.

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SEGMENT REPORTING

9 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

SEGMENT REPORTING

SEGMENT REPORTING

We identify our segments based on our management structure and the financial information used by our chief executive officer, who is our chief operating decision maker, to assess segment performance and allocate resources among our operating units.  We historically had operated predominantly in one industry segment – the development, manufacture and sale of Chemical Mechanical Planarization (CMP) consumables products.  In connection with the Acquisition, we reassessed our operating and reportable segments, and determined that we have the following two reportable segments:

Electronic Materials

Electronic Materials includes products and solutions for the semiconductor industry.  We manufacture and sell CMP consumables, including CMP slurries and polishing pad products, and high-purity process chemicals used to etch and clean silicon wafers in the production of semiconductors, photovoltaics (solar cells) and flat panel displays.

Performance Materials

Performance Materials includes pipeline performance products and services for energy industries, wood treatment products, and products and equipment used in the precision optics industry.

Beginning in fiscal 2019 and with the Acquisition, our chief operating decision maker evaluates segment performance based upon revenue and segment adjusted EBITDA.  Segment adjusted EBITDA is defined as earnings before interest, income taxes, depreciation and amortization, adjusted for certain items that affect comparability from period to period.  These adjustments include items related to the Acquisition, such as expenses incurred to complete the acquisition, integration-related expenses and impact of fair value adjustments to inventory acquired from KMG, and certain costs related to the KMG-Bernuth warehouse fire. We exclude these items from earnings when presenting our adjusted EBITDA measure because we believe they will be incurred infrequently and/or are otherwise not indicative of a segment's regular, ongoing operating performance. Adjusted EBITDA is also the basis of a performance metric for our fiscal 2019 Short-Term Incentive Program (STIP).  In addition, our chief operating decision maker does not use assets by segment to evaluate performance or allocate resources. Therefore, we do not disclose assets by segment.

Revenue from external customers and segment adjusted EBITDA were (in thousands):

	Three Months Ended June 30,				Nine Months Ended June 30,
	2019		2018		2019		2018
Segment Revenue
Electronic Materials	$	212,123	$	143,810	$	615,586	$	413,227
Performance Materials	59,759		6,627		143,465		20,167
Total	$	271,882	$	150,437	$	759,051	$	433,394

	Three Months Ended June 30,						Nine Months Ended June 30,
	2019			2018			2019			2018
Segment adjusted EBITDA:
Electronic Materials	$	70,859		$	57,460		$	220,594		$	162,641
Performance Materials	27,425			1,081			63,152			3,600
Unallocated corporate expenses	(12,527		)	(9,715		)	(35,621		)	(30,471		)
Interest expense	(12,757		)	(513		)	(32,978		)	(2,803		)
Interest income	417			1,141			2,004			3,248
Depreciation and amortization	(26,587		)	(6,410		)	(70,476		)	(19,527		)
Acquisition and integration related expenses	(2,910		)	—			(33,108		)	—
Charge for fair value write-up of acquired inventory sold	(42		)	—			(14,869		)	—
Costs related to KMG-Bernuth warehouse fire (See Note 12)	(4,450		)	—			(4,450		)	—
Income before income taxes	$	39,428		$	43,044		$	94,248		$	116,688

We began to manage and report our results under the new organizational structure in conjunction with the Acquisition in fiscal 2019 and have reflected this change for all historical periods presented. Since the two segments operate independently and serve different markets and customers, there are no sales between segments.  Revenue from external customers and segment adjusted EBITDA shown for Performance Materials for the quarter ended June 30, 2018 includes Cabot Microelectronics’ heritage QED business.  The adjustments to segment EBITDA for the three and nine months ended June 30, 2019 represent addbacks of KMG acquisition and integration related expenses, and a charge for the write-up of inventory acquired from KMG to fair value, for inventory sold in the period, and costs related to KMG-Bernuth warehouse fire.  There were no adjustments to segment EBITDA for the three and nine months ended June 30, 2018.  Unallocated corporate expenses include expenses associated with executive leadership and public company costs, and the unallocated portions of corporate functions including finance, legal, human resources, information technology, and corporate development not directly attributable to a reportable segment.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS (Policies)

9 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

USE OF ESTIMATES

USE OF ESTIMATES

The preparation of financial statements and related disclosures in conformity with U.S. GAAP requires management to make judgments, assumptions and estimates that affect the amounts reported in the Consolidated Financial Statements and accompanying notes. The accounting estimates that require management's most difficult and subjective judgments include, but are not limited to, those estimates related to bad debt expense, inventory valuation, impairment of long-lived assets, business combinations, goodwill, other intangible assets, share-based compensation, income taxes and contingencies. We base our estimates on historical experience, current conditions and on various other assumptions that we believe are reasonable under the circumstances. However, future events are subject to change and estimates and judgments routinely require adjustment. Actual results may differ from these estimates under different assumptions or conditions.

REVENUE RECOGNITION

REVENUE RECOGNITION

As of October 1, 2018, the Company began applying the provisions of Accounting Standards Codification 606-10, “Revenue from Contracts with Customers” (“ASC 606”), and all related applicable guidance using the modified retrospective method applied to those contracts that were not completed as of October 1, 2018.  The Company recognizes revenue under the core principle of depicting the transfer of control to the Company’s customers in an amount reflecting the consideration to which the Company expects to be entitled. In order to achieve that core principle, the Company applies the following five step approach: (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and, (5) recognize revenue when a performance obligation is satisfied.

Upon adoption of ASC 606, we recognized a $933 decrease to the opening balance of retained earnings, net of tax, due to the cumulative impact of adopting the new revenue standard. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods.  The Company changed its accounting policy for revenue recognition for customer incentives that provide free products and tiered pricing.  For free products, the new revenue standard requires that a portion of the transaction price be allocated to the free product and deferred until the product has been delivered.  We previously accrued for undelivered free product as a charge to cost of sales.  In prior fiscal years, in accordance with ASC 605, we did not consider prospective tiered pricing to represent a material right.

The cumulative effect of the changes made to our Consolidated Balance Sheet as of October 1, 2018 for the adoption of the new revenue standard was:

	Balance at September 30, 2018		Adjustments Due to ASC 606			Balance at October 1, 2018
Deferred income tax assets	$	5,840	$	261		$	6,101
Accrued expenses, income taxes payable and other current liabilities	82,983		(47		)	82,936
Other long-term liabilities	13,046		1,241			14,287
Retained earnings	$	471,673	$	(933	)	$	470,740

We have determined that the effect of applying the new revenue standard during the three and nine months ended June 30, 2019 was immaterial to our financial statements compared to revenue guidance in effect before the adoption of the new revenue standard.  As a result, for the three and nine months ended June 30, 2019, we are not disclosing the quantitative amount by which each financial statement line item is affected by the application of the new revenue standard.

As part of the adoption of ASU 606, the Company elected to use certain allowed practical expedients. For the Company’s contracts that have an original duration of one year or less as of the adoption date, the Company uses the practical expedient applicable to such contracts and does not consider the time value of money. Further, because of the short duration of these contracts, the Company has not disclosed the transaction price for the future performance obligations as of the end of each reporting period for contracts having an expected duration of one year or less.  See Note 3 of this Report on Form 10-Q for disaggregated revenue, the reconciliation of contract balances and transaction price allocation to remaining performance obligations for contracts expected to remain effective beyond one year.

Performance Obligations and Material Rights

At contract inception, the Company assesses the goods and services promised in its contracts with customers and identifies a performance obligation for each material promise to the customer.  A performance obligation is a promise in a contract to transfer a distinct good or service, or a bundle of goods or services, to the customer, and is the unit of accounting under ASC 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. A majority of the Company’s contracts have a single performance obligation which represents, in most cases, the products, equipment or services being sold to the customer. Some contracts include multiple performance obligations, including prospective tiered price discounts or delivery of free product that we have concluded represents a material right. Contracts with prospective tiered price discounts require judgment in determining if that discount represents a material right.

Contracts vary in length, and payment terms vary by the type and location of the Company’s customers and the products or services offered. However, the period of time between invoicing and when payment is due is typically not significant and has no significant financing components.  Customers pay in accordance with negotiated terms upon receipt of goods or completion of services.  For these contracts, the transaction price is determined upon establishment of the contract that contains the final terms of the sale, including the description, quantity, and price of goods or services purchased.  In certain instances, we receive consideration from a customer prior to transferring goods or services to the customer under the terms of a sales contract.  In such cases, we record deferred revenue until the performance obligation is satisfied, which represents a contract liability, and is included in the contract liabilities discussed in Note 3 of this Report on Form 10-Q.

The Company recognizes revenue related to product sales at a point in time following the transfer of control of such products to the customer, which generally occurs upon shipment, or delivery depending on the terms of the underlying contracts. The Company considers control to have transferred upon shipment or delivery because the Company has a present right to payment at that time, the customer has legal title to the asset, the Company has transferred physical possession of the asset, and the customer has significant risks and rewards of ownership of the asset.  Revenue is recognized on consignment sales when control transfers to the customer, generally at the point of customer usage of the product. The Company also records revenue for services provided to the pipeline and oilfield energy industries.  These services include preventive maintenance, repair and specialized isolation sealing on pipelines and training. Revenue is recorded at a point in time when the services are completed as this is when right to payment and customer acceptance occurs.

For sales contracts that contain multiple performance obligations, the Company allocates the transaction price to each performance obligation identified in the contract based on relative standalone selling prices or estimates of such prices.  Standalone selling price, once established, is then used to allocate total consideration proportionally to the various performance obligations within a contract. Most contracts where we have determined there to be multiple performance obligations relate to where we have identified the existence of a material right such that we provide prospective tiered pricing discounts or free product. When we invoice for products shipped under these contracts, we defer the revenue associated with these rights on the balance sheet as a contract liability. Revenue is recognized when the customer exercises the option to purchase goods at a discount in the case of the prospective tiered pricing discounts or when we ship the free product.

Variable Consideration

The primary type of variable consideration present in the Company’s contracts are rebates and early payment discounts, both of which are immaterial. Early payment discounts are offered on a limited basis and are not significant.  The Company also offers rebates based upon cumulative volume of purchases within a quarter and accrues for the rebate obligation within the quarter that the rebate is earned.  ASC 606 did not change the accounting for rebates under ASC 605.

Costs to Obtain and Fulfill a Contract

 For certain contracts within the Performance Materials segment, commissions are paid to sales agents based upon a percentage of end-customer invoice value. Agents are paid the commissions after funds are received by the Company from its customers.  Under ASC 340, sales commissions are required to be capitalized and expensed over the associated contract period.  However, as a practical expedient, the Company does not capitalize commissions as the associated contracts are generally one year or less in duration. For shipping and handling activities performed after a customer obtains control of the goods, the Company has elected to account for these costs as activities to fulfill the promise to transfer the goods and included in cost of sales.

EFFECTS OF RECENT ACCOUNTING PRONOUNCEMENTS

EFFECTS OF RECENT ACCOUNTING PRONOUNCEMENTS

In February 2016, the FASB issued ASU No. 2016-02, "Leases" (Topic 842).  The provisions of ASU 2016-02 require a dual approach for lessee accounting under which a lessee would recognize a right-of-use asset and a corresponding lease liability.  Leases will be classified as either finance or operating leases.  For finance leases, a lessee will recognize interest expense and amortization of the right-of-use asset, and for operating leases, the lessee will recognize a straight-line total lease expense.  The guidance also requires qualitative and specific quantitative disclosures to supplement the amounts recorded in the financial statements, to afford better understanding of an entity's leasing activities, including any significant judgments and estimates.   The guidance was amended through various ASU's subsequent to ASU 2016-02, all of which will be effective for us beginning October 1, 2019, but early adoption is permitted.  We have finished reviewing the population of our lease contracts and are in the process of implementing a new third party lease software system. The Company currently plans to elect the optional package of practical expedients to not reassess prior conclusions related to contracts containing leases, lease classification and initial direct costs and therefore, does not expect the adoption of ASU 2016-02 to have a significant impact on the Consolidated Statements of Income. We expect to adopt the new standard in our first quarter of fiscal 2020 applying the optional transition method upon adoption. We continue to evaluate the amount of right-of-use asset and lease liability that will ultimately be recorded on the Consolidated Balance Sheets and the impact on the Consolidated Statements of Income.

In June 2016, the FASB issued ASU No. 2016-13, "Measurement of Credit Losses on Financial Instruments" (Topic 326). The provisions of this standard require financial assets measured at amortized cost to be presented at the net amount expected to be collected. An allowance account would be established to present the net carrying value at the amount expected to be collected. ASU 2016-13 also provides that credit losses relating to available-for-sale debt securities should be recorded through an allowance for credit losses. The guidance was amended through various ASU's subsequent to ASU 2016-13, all of which will be effective for us beginning October 1, 2020, but early adoption is permitted as of October 1, 2019. We are currently evaluating the impact of implementation of this standard on our financial statements.

In March 2017, the FASB issued ASU No. 2017-07 "Improving the Presentation of Net Period Pension Cost and Net Period Postretirement Benefit Cost" (Topic 715). The provisions of ASU 2017-07 provided specific guidance on the presentation of the components of net benefit cost.  We adopted this standard ASU 2017-07 effective October 1, 2018 and applied it retrospectively. Pursuant to the adoption, net service costs are recorded as fringe benefit expense under cost of sales and operating expenses, and all other costs are recorded in the Other income (expense), net in our Consolidated Statements of Income. The impact of the retrospective adoption in fiscal year 2018 is not material.

In May 2017, the FASB issued ASU No. 2017-09 "Scope of Modification Accounting" (Topic 718). The provisions of ASU 2017-09 provide specific guidance about which changes to the term or conditions of a share-based payment require an entity to apply modification accounting.  We adopted ASU 2017-09 effective October 1, 2018 and will apply this new standard to our share-based compensation awards, to the extent modified.

In August 2017, the FASB issued ASU No. 2017-12 "Derivatives and Hedging" (Topic 815). The provisions of this standard amend the hedge accounting model in ASC 815 to expand an entity's ability to hedge nonfinancial and financial risk components, reduce complexity in fair value hedges of interest rate risk, eliminate the requirement to separately measure and report hedge ineffectiveness, and generally require the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. The guidance also eases certain documentation and assessment requirements and modifies the accounting for components excluded from the assessment of hedge effectiveness.  We early adopted this guidance effective January 1, 2019, and we did not have any hedges that existed as of the initial application date.  We applied the new guidance to the interest rate swap that we entered into during our second quarter of fiscal 2019. Pursuant to the guidance, we performed initial quantitative hedge effectiveness testing upon the inception of the hedge, and determined the hedge to be highly effective.  Therefore, unrealized changes in fair value are recorded in other comprehensive income.  In addition, we reclassify the realized gains and losses out of other comprehensive income, and into interest expense in our Consolidated Statements of Income, which is the same financial statement line as the hedged item.  We will perform subsequent assessments of hedge effectiveness qualitatively on a quarterly basis.

In February 2018, the FASB issued ASU No. 2018-02 "Income Statement – Reporting Comprehensive Income (Topic 220)".  The amendments in this standard allow a company to reclassify the stranded tax effects resulting from the Tax Cuts and Jobs Act (the "Tax Act") from accumulated other comprehensive income to retained earnings. ASU 2018-02 will be effective for us beginning October 1, 2019, but early adoption is permitted. We are currently evaluating and quantifying the amount to be reclassified into retained earnings and expect to record the reclassification on October 1, 2019.

In June 2018, the FASB issued ASU No. 2018-07 " Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting."  The ASU simplified the accounting for share-based payments granted to nonemployees for goods and services, therefore guidance on such payments to nonemployees would be mostly aligned with the requirements for share-based payments granted to employees. ASU 2018-07 will be effective for us beginning October 1, 2019, but early adoption is permitted (but no earlier than the adoption date of Topic 606). We do not expect implementation of this standard to have material impact on our financial statements.

In August 2018, the FASB issued ASU No. 2018-13 " Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement".  The ASU provides specific guidance on various disclosure requirements in Topic 820, including removal, modification and addition to current disclosure requirements. ASU 2018-13 will be effective for us beginning October 1, 2020, but early adoption is permitted. We are currently evaluating the impact of implementation of this standard on our disclosures.

In August 2018, the FASB issued ASU No. 2018-15 " Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force)".  The ASU Requires an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. ASU 2018-15 will be effective for us beginning October 1, 2020, but early adoption is permitted. We are currently evaluating the impact of implementation of this standard on our financial statements.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS (Tables)

9 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Cumulative effect adoption of ASC 606 on balance sheet

The cumulative effect of the changes made to our Consolidated Balance Sheet as of October 1, 2018 for the adoption of the new revenue standard was:

	Balance at September 30, 2018		Adjustments Due to ASC 606			Balance at October 1, 2018
Deferred income tax assets	$	5,840	$	261		$	6,101
Accrued expenses, income taxes payable and other current liabilities	82,983		(47		)	82,936
Other long-term liabilities	13,046		1,241			14,287
Retained earnings	$	471,673	$	(933	)	$	470,740

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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

9 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

The following table shows revenue generated by product area during the three and nine months ended June 30, 2019 and 2018:

	Three Months Ended June 30,				Nine Months Ended June 30,
	2019		2018		2019		2018
Revenue:
Electronic Materials:
CMP Slurries	$	108,617	$	122,893	$	345,244	$	352,414
Electronic Chemicals	80,103		—		198,474		—
CMP Pads	23,403		20,917		71,868		60,813
Total Electronic Materials	212,123		143,810		615,586		413,227
Performance Materials	59,759		6,627		143,465		20,167
Total revenue	$	271,882	$	150,437	$	759,051	$	433,394

Reconciliation of contract liability balances

The following table provides information about contract liability balances:

	June 30, 2019		October 1, 2018
Contract liabilities (current)	$	3,958	$	5,310
Contract liabilities (noncurrent)	1,378		1,239

Transaction price allocated to remaining performance obligation

The table below discloses (1) the aggregate amount of the transaction price allocated to performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period for contracts with an original duration of greater than one year and (2) when the Company expects to recognize this revenue.

	Less Than 1 Year		1-3 Years		3-5 Years		Total
Revenue expected to be recognized on contract liability amounts as of June 30, 2019	$	211	$	975	$	403	$	1,589

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BUSINESS COMBINATION (Tables)

9 Months Ended

Jun. 30, 2019

Business Combinations [Abstract]

Summary of components of total consideration

See below for a summary of the different components that comprise the total consideration.

	Amount
Total cash consideration paid for KMG outstanding common stock and equity awards	$	900,756
Cash provided to payoff KMG debt	304,648
Total cash consideration paid	1,205,404
Fair value of Cabot Microelectronics common stock issued for KMG outstanding common stock and equity awards	331,048
Total consideration transferred	$	1,536,452

Summary of preliminary allocation of fair values of assets acquired and liabilities assumed

The following table summarizes the preliminary allocation of fair values of assets acquired and liabilities assumed as of the Acquisition Date.

	Amount
Cash	$	23,217
Accounts receivable	64,711
Inventories	68,963
Prepaid expenses and other current assets	14,798
Property, plant and equipment	147,398
Intangible assets	844,800
Other long-term assets	6,208
Accounts payable	(28,894		)
Accrued expenses and other current liabilities	(43,451		)
Deferred income taxes liabilities	(164,165		)
Other long-term liabilities	(3,754		)
Total identifiable net assets acquired	929,831
Goodwill	606,621
Total consideration transferred	$	1,536,452

Components of identifiable intangible asset acquired and their estimated useful lives

The following table sets forth the components of identifiable intangible assets acquired and their estimated useful lives as of the Acquisition Date:

	Fair Value		Estimated Useful Life (years)
Customer relationships	$	704,000	15-20
Technology and know-how	85,500		9-11
Trade name - Flowchem	46,000		Indefinite
Trade name - all other	7,000		1-15
EPA product registration rights	2,300		15
Total intangible assets	$	844,800

Business Acquisition, Pro Forma Information [Table Text Block]

The following unaudited supplemental pro forma information summarizes the combined results of operations for Cabot Microelectronics and KMG as if the Acquisition had occurred on October 1, 2017.

	Three Months Ended June 30,				Nine Months Ended June 30,
	2019		2018		2019		2018
Revenues	$	271,882	$	272,589	$	821,029	$	784,694
Net income (loss)	16,077		33,211		88,938		(1,369		)
Earnings per share - basic	$	0.55	$	1.15	$	3.07	$	(0.05	)
Earnings per share - diluted	$	0.54	$	1.12	$	3.02	$	(0.05	)

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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

9 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Fair value of financial instruments

The following table presents financial instruments, other than long-term debt, that we measured at fair value on a recurring basis at June 30, 2019 and September 30, 2019.  See Note 10 for a detailed discussion of our long-term debt.  We have classified the following assets and liabilities in accordance with the fair value hierarchy set forth in the applicable standards.  In instances where the inputs used to measure the fair value of an asset fall into more than one level of the hierarchy, we have classified them based on the lowest-level input that is significant to the determination of the fair value. 

June 30, 2019	Level 1		Level 2		Level 3		Total Fair Value
Assets:
Cash and cash equivalents	$	168,678	$	—	$	—	$	168,678
Other long-term investments	1,411		—		—		1,411
Derivative financial instruments	—		$	8	—		8
Total assets	$	170,089	$	8	$	—	$	170,097
Liabilities:
Derivative financial instruments	—		20,217		—		20,217
Total liabilities	$	—	$	20,217	$	—	$	20,217

September 30, 2018	Level 1		Level 2		Level 3		Total Fair Value
Assets:
Cash and cash equivalents	$	352,921	$	—	$	—	$	352,921
Other long-term investments	1,137		—		—		1,137
Total assets	$	354,058	$	—	$	—	$	354,058
Liabilities:
Derivative financial instruments	—		339		—		339
Total liabilities	$	—	$	339	$	—	$	339

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INVENTORIES (Tables)

9 Months Ended

Jun. 30, 2019

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories consisted of the following:

	June 30, 2019		September 30, 2018
Raw materials	$	59,684	$	35,150
Work in process	13,119		8,117
Finished goods	72,980		28,659
Total	$	145,783	$	71,926

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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

9 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of other intangible assets

The components of other intangible assets are:

	June 30, 2019				September 30, 2018
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Other intangible assets subject to amortization:
Product technology, trade secrets and know-how	$	134,415	$	34,598	$	48,825	$	25,305
Acquired patents and licenses	10,570		8,356		8,270		8,252
Customer relationships, trade names, and distribution rights	740,058		51,225		28,068		17,574
Total other intangible assets subject to amortization	885,043		94,179		85,163		51,131
Other intangible assets not subject to amortization:
Other indefinite-lived intangibles*	47,170				1,170
Total other intangible assets not subject to amortization	47,170				1,170
Total other intangible assets	$	932,213	$	94,179	$	86,333	$	51,131

*Other indefinite-lived intangible assets not subject to amortization consist primarily of trade names.

Schedule of amortization expense on intangible assets

Amortization expense on our intangible assets was $16,926 and $43,244 for the three and nine months ended June 30, 2019, respectively, and was $1,780 and $5,716 for the three and nine months ended June 30, 2018, respectively. Estimated future amortization expense for the five succeeding fiscal years is as follows:

Fiscal Year	Estimated Amortization Expense
Remainder of 2019	$	16,931
2020	87,940
2021	87,243
2022	79,832
2023	67,674

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OTHER LONG-TERM ASSETS (Tables)

9 Months Ended

Jun. 30, 2019

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Other long-term assets

Other long-term assets consisted of the following:

	June 30, 2019		September 30, 2018
Long-term contract assets	674		1,548
Long-term SERP Investment	1,411		1,137
Prepaid unamortized debt issuance cost - revolver	752		—
Other long-term assets	2,821		1,979
Total	$	5,658	$	4,664

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ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES (Tables)

9 Months Ended

Jun. 30, 2019

Payables and Accruals [Abstract]

Accrued expenses, income taxes payable and other current liabilities

Accrued expenses, income taxes payable and other current liabilities consisted of the following:

	June 30, 2019		September 30, 2018
Accrued compensation	$	31,362	$	35,367
Income taxes payable	14,418		18,045
Dividends payable	12,879		10,822
Taxes, other than income taxes	6,806		1,976
KMG - Bernuth warehouse fire related (See Note 12)	4,450		—
Accrued interest	3,677		—
Contract liabilities	3,958		4,894
Goods and services received, not yet invoiced	3,772		1,954
Other accrued expenses	13,939		9,925
Total	$	95,261	$	82,983

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DEBT (Tables)

9 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Schedule of principal repayments of debt

As of June 30, 2019, scheduled principal repayments of the Term Loan were:

Fiscal Year	Principal Repayments
Remainder of 2019	$	5,325
2020	10,650
2021	10,650
2022	10,650
2023	10,650
Greater than 5 years	914,413
Total	$	962,338

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DERIVATIVE FINANCIAL INSTRUMENTS (Tables)

9 Months Ended

Jun. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of derivative instruments in the Consolidated Balance Sheets

The fair value of our derivative instruments included in the Consolidated Balance Sheets, which was determined using Level 2 inputs, was:

		Derivative Assets				Derivative Liabilities
	Consolidated Balance Sheet Location	June 30, 2019		September 30, 2018		June 30, 2019		September 30, 2018
Derivatives designated as hedging instruments
Interest rate swap contract	Accrued expenses, income taxes payable and other current liabilities	$	—	$	—	$	4,274	$	—
	Other long-term liabilities	—		$	—	$	15,753	$	—
Derivatives not designated as hedging instruments
Foreign exchange contracts	Prepaid expenses and other current assets	$	8	$	—	$	—	$	—
	Accrued expenses, income taxes payable and other current liabilities	$	—	$	—	$	190	$	339

Schedule of derivative instruments on Consolidated Statements of Income

The following table summarizes the effect of our derivative instruments on our Consolidated Statements of Income for the three and nine months ended June 30, 2019 and 2018:

		(Loss) Recognized in Statement of Income
		Three Months Ended						Nine Months Ended
	Statement of Income Location	June 30, 2019			June 30, 2018			June 30, 2019			June 30, 2018
Derivatives not designated as hedging instruments
Foreign exchange contracts	Other income (expense), net	$	(29	)	$	(1,080	)	$	(67	)	$	(1,002	)

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)

9 Months Ended

Jun. 30, 2019

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated other comprehensive income (loss)

The table below summarizes the components of accumulated other comprehensive income (loss) (AOCI), net of tax provision/(benefit), as of June 30, 2019 and 2018:

	Foreign Currency Translation		Cash Flow Hedges			Pension and Other Postretirement Liabilities			Total
Balance at September 30, 2018	$	5,918	$	(17	)	$	(1,362	)	$	4,539
Foreign currency translation adjustment, net of tax of $564	4,132		—			—			4,132
Unrealized gain (loss) on cash flow hedges:
Change in fair value, net of tax of $(4,500)	—		(15,487		)	—			(15,487		)
Reclassification adjustment into earnings, net of tax of $(9)	—		(31		)	—			(31		)
Balance at June 30, 2019	$	10,050	$	(15,535	)	$	(1,362	)	$	(6,847	)

	Foreign Currency Translation		Cash Flow Hedges			Pension and Other Postretirement Liabilities			Available-for-Sale Securities			Total
Balance at September 30, 2017	$	5,239	$	46		$	(1,336	)	$	—		$	3,949
Foreign currency translation adjustment, net of tax of $(2,303)	2,276		—			—						2,276
Unrealized loss on available-for-sale securities, net of tax of $0	—		—			—			(48		)	(48		)
Unrealized gain (loss) on cash flow hedges:
Change in fair value, net of tax of $111	—		319			—						319
Reclassification adjustment into earnings, net of tax of $(133)	—		(382		)	—						(382		)
Balance at June 30, 2018	$	7,515	$	(17	)	$	(1,336	)	$	(48	)	$	6,114

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SHARE-BASED COMPENSATION PLANS (Tables)

9 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement [Abstract]

Schedule of share-based compensation expense

Share-based compensation expense for the three and nine months ended June 30, 2019 and 2018, was as follows:

	Three Months Ended June 30,						Nine Months Ended June 30,
	2019			2018			2019			2018
Cost of sales	$	540		$	542		$	2,169		$	1,896
Research, development and technical	390			445			1,733			1,491
Selling, general and administrative	2,410			3,199			11,146			10,882
Total share-based compensation expense	3,340			4,186			15,048			14,269
Tax benefit	(670		)	(1,023		)	(3,121		)	(3,272		)
Total share-based compensation expense, net of tax	$	2,670		$	3,163		11,927			$	10,997

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EARNINGS PER SHARE (Tables)

9 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Schedule of earnings per share

The standards of accounting for earnings per share require companies to provide a reconciliation of the numerator and denominator of the basic and diluted earnings per share computations.  Basic and diluted earnings per share were calculated as follows:

	Three Months Ended June 30,					Nine Months Ended June 30,
	2019		2018			2019		2018
Numerator:
Net Income	$	18,878	$	35,171		$	59,458	$	61,825
Less: income attributable to participating securities	—		(34		)	—		(73		)
Earnings available to common shares	$	18,878	$	35,137		$	59,458	$	61,752
Denominator:
Weighted average common shares	29,063,907		25,611,505			28,398,960		25,479,078
(Denominator for basic calculation)
Weighted average effect of dilutive securities:
Share-based compensation	504,366		707,133			524,565		742,786
Diluted weighted average common shares	29,568,273		26,318,638			28,923,525		26,221,864
(Denominator for diluted calculation)
Earnings per share:
Basic	$	0.65	$	1.37		$	2.09	$	2.42
Diluted	$	0.64	$	1.34		$	2.06	$	2.35

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SEGMENT REPORTING (Tables)

9 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

Schedule of segment revenue

Revenue from external customers and segment adjusted EBITDA were (in thousands):

	Three Months Ended June 30,				Nine Months Ended June 30,
	2019		2018		2019		2018
Segment Revenue
Electronic Materials	$	212,123	$	143,810	$	615,586	$	413,227
Performance Materials	59,759		6,627		143,465		20,167
Total	$	271,882	$	150,437	$	759,051	$	433,394

Schedule of segment adjusted EBITDA

	Three Months Ended June 30,						Nine Months Ended June 30,
	2019			2018			2019			2018
Segment adjusted EBITDA:
Electronic Materials	$	70,859		$	57,460		$	220,594		$	162,641
Performance Materials	27,425			1,081			63,152			3,600
Unallocated corporate expenses	(12,527		)	(9,715		)	(35,621		)	(30,471		)
Interest expense	(12,757		)	(513		)	(32,978		)	(2,803		)
Interest income	417			1,141			2,004			3,248
Depreciation and amortization	(26,587		)	(6,410		)	(70,476		)	(19,527		)
Acquisition and integration related expenses	(2,910		)	—			(33,108		)	—
Charge for fair value write-up of acquired inventory sold	(42		)	—			(14,869		)	—
Costs related to KMG-Bernuth warehouse fire (See Note 12)	(4,450		)	—			(4,450		)	—
Income before income taxes	$	39,428		$	43,044		$	94,248		$	116,688

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BACKGROUND AND BASIS OF PRESENTATION (Details) - segment	3 Months Ended	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	2	2

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Oct. 01, 2018	Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred income taxes	$ 5,612	$ 6,101	$ 5,840
Accrued expenses, income taxes payable and other current liabilities	95,261	82,936	82,983
Other long-term liabilities	43,338	14,287	13,046
Retained earnings	$ 494,009	$ 470,740	471,673
Calculated under revenue guidance in effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred income taxes			5,840
Accrued expenses, income taxes payable and other current liabilities			82,983
Other long-term liabilities			13,046
Retained earnings			471,673
Adjustments Due to ASC 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred income taxes			261
Accrued expenses, income taxes payable and other current liabilities			(47)
Other long-term liabilities			1,241
Retained earnings			$ (933)

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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Revenue from Contract with Customer [Abstract]
Number of reportable segments | segment	2		2
Disaggregation of Revenue [Abstract]
Revenue	$ 271,882	$ 150,437	$ 759,051	$ 433,394
Electronic Materials
Disaggregation of Revenue [Abstract]
Revenue	212,123	143,810	615,586	413,227
Electronic Materials | CMP Slurries
Disaggregation of Revenue [Abstract]
Revenue	108,617	122,893	345,244	352,414
Electronic Materials | Electronic Chemicals
Disaggregation of Revenue [Abstract]
Revenue	80,103	0	198,474	0
Electronic Materials | CMP Pads
Disaggregation of Revenue [Abstract]
Revenue	23,403	20,917	71,868	60,813
Performance Materials
Disaggregation of Revenue [Abstract]
Revenue	$ 59,759	$ 6,627	$ 143,465	$ 20,167

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REVENUE FROM CONTRACTS WITH CUSTOMERS - Reconciliation of Contract Balances (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Oct. 01, 2018
Contract with Customer, Liability [Abstract]
Contract liabilities (current)	$ 3,958	$ 3,958	$ 5,310
Contract liabilities (noncurrent)	1,378	1,378	$ 1,239
Change in Contract with Customer, Liability [Abstract]
Revenue recognized in contract liability	697	4,857
Accrued expenses, income taxes payable and other current liabilities
Contract with Customer, Liability [Abstract]
Contract liabilities (current)	3,958	3,958
Other long-term liabilities
Contract with Customer, Liability [Abstract]
Contract liabilities (noncurrent)	$ 1,378	$ 1,378

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REVENUE FROM CONTRACTS WITH CUSTOMERS - Transaction Price Allocated to Remaining Performance Obligations (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized on contract liability amounts as of end of period	$ 211
Revenue, Performance Obligation [Abstract]
Revenue expected to be recognized on contract liability, satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized on contract liability amounts as of end of period	$ 975
Revenue, Performance Obligation [Abstract]
Revenue expected to be recognized on contract liability, satisfaction period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue expected to be recognized on contract liability amounts as of end of period	$ 1,589
Revenue, Performance Obligation [Abstract]
Revenue expected to be recognized on contract liability, satisfaction period	3 years

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BUSINESS COMBINATION - Narrative (Details) - USD ($)		3 Months Ended		8 Months Ended	9 Months Ended
	Nov. 15, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018
Business Acquisition [Line Items]
Acquisition of business, net of cash acquired					$ 1,182,186,000	$ 0
Debt, face amount	$ 1,265,000,000.0
Goodwill		$ 708,390,000		$ 708,390,000	708,390,000		$ 101,083,000
Non-cash charge on inventory step up of acquired inventory sold		42,000	$ 0		14,869,000	0
Share-based compensation expense					15,048,000	14,269,000
Electronic Materials
Business Acquisition [Line Items]
Goodwill		358,108,000		358,108,000	358,108,000
Performance Materials
Business Acquisition [Line Items]
Goodwill		350,282,000		350,282,000	350,282,000
Revolving Credit Facility
Business Acquisition [Line Items]
Debt, face amount	200,000,000
Line of credit facility, borrowing capacity	200,000,000.0
Term Loan Facility
Business Acquisition [Line Items]
Debt, face amount	$ 1,065,000,000.0
KMG
Business Acquisition [Line Items]
Business acquisition, percentage of voting interest acquired	100.00%
Acquisition of business, net of cash acquired	$ 1,513,235,000
Consideration transferred	1,536,452,000
Cash acquired from acquisition	$ 23,217,000
Amount received for each share of KMG common stock (in dollars per share)	$ 55.65
Share percentage received for each share of KMG common stock (in shares)	0.2000
Shares issued to acquire entity (in shares)	3,237,005
Share price of shares issued to acquire entity (in dollars per share)	$ 102.27
Debt, face amount	$ 1,065,000,000
Line of credit facility, borrowing capacity	200,000,000
Debt issuance costs	$ 21,408,000
Weighted average useful life	17 years 10 months 24 days
Goodwill	$ 606,621,000
Transaction costs				21,889,000
Net sales				316,690,000
Net income				4,782,000
Non-cash charge on inventory step up of acquired inventory sold				$ 14,869,000
KMG | Acquisition-related costs
Business Acquisition [Line Items]
Transaction costs			568,000			31,611,000
Share-based compensation expense			1,380,000			37,392,000
KMG | Fair value write-up of inventory
Business Acquisition [Line Items]
Non-cash charge on inventory step up of acquired inventory sold			$ 0			$ 14,859,000
KMG | Selling, general and administrative
Business Acquisition [Line Items]
Transaction costs		2,910,000			33,108,000
KMG | Cost of sales
Business Acquisition [Line Items]
Transaction costs		$ 42,000			$ 14,869,000
KMG | Electronic Materials
Business Acquisition [Line Items]
Goodwill	261,733,000
KMG | Performance Materials
Business Acquisition [Line Items]
Goodwill	344,888,000
KMG | Revolving Credit Facility
Business Acquisition [Line Items]
Debt issuance costs	859,000
KMG | Term Loan Facility
Business Acquisition [Line Items]
Debt issuance costs	$ 20,549,000

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BUSINESS COMBINATION - Consideration (Details) - KMG $ in Thousands	Nov. 15, 2018 USD ($)
Business Combination, Consideration Transferred [Abstract]
Cash consideration paid	$ 1,205,404
Cash provided to payoff KMG debt	304,648
Fair value of Cabot Microelectronics common stock issued for KMG outstanding common stock and equity awards	331,048
Total consideration transferred	1,536,452
Common stock and equity awards
Business Combination, Consideration Transferred [Abstract]
Cash consideration paid	$ 900,756

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BUSINESS COMBINATION - Allocation of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Nov. 15, 2018	Sep. 30, 2018
Fair values of assets acquired and liabilities assumed [Abstract]
Goodwill	$ 708,390		$ 101,083
KMG
Fair values of assets acquired and liabilities assumed [Abstract]
Cash		$ 23,217
Accounts receivable		64,711
Inventories		68,963
Prepaid expenses and other current assets		14,798
Property, plant and equipment		147,398
Intangible assets		844,800
Other long-term assets		6,208
Accounts payable		(28,894)
Accrued expenses and other current liabilities		(43,451)
Deferred income taxes liabilities		(164,165)
Other long-term liabilities		(3,754)
Total identifiable net assets acquired		929,831
Goodwill		606,621
Total consideration transferred		$ 1,536,452

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BUSINESS COMBINATION - Identifiable Intangible Assets Acquired (Details) - KMG $ in Thousands	Nov. 15, 2018 USD ($)
Business Combinations [Abstract]
Intangible assets	$ 844,800
Trade name - Flowchem
Acquired Indefinite-lived Intangible Assets [Line Items]
Fair value, indefinite lived intangible assets	46,000
Customer relationships
Fair Value
Fair value, finite lived intangible assets	$ 704,000
Customer relationships | Minimum
Fair Value
Estimated useful live, finite lived intangible asset	15 years
Customer relationships | Maximum
Fair Value
Estimated useful live, finite lived intangible asset	20 years
Technology and know-how
Fair Value
Fair value, finite lived intangible assets	$ 85,500
Technology and know-how | Minimum
Fair Value
Estimated useful live, finite lived intangible asset	9 years
Technology and know-how | Maximum
Fair Value
Estimated useful live, finite lived intangible asset	11 years
Trade name - all other
Fair Value
Fair value, finite lived intangible assets	$ 7,000
Trade name - all other | Minimum
Fair Value
Estimated useful live, finite lived intangible asset	1 year
Trade name - all other | Maximum
Fair Value
Estimated useful live, finite lived intangible asset	15 years
EPA product registration rights
Fair Value
Fair value, finite lived intangible assets	$ 2,300
Estimated useful live, finite lived intangible asset	15 years

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BUSINESS COMBINATION - Pro Forma Information (Details) - KMG - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition, Pro Forma Information [Abstract]
Revenues	$ 271,882	$ 272,589	$ 821,029	$ 784,694
Net income (loss)	$ 16,077	$ 33,211	$ 88,938	$ (1,369)
Earnings per share - basic (in dollars per share)	$ 0.55	$ 1.15	$ 3.07	$ (0.05)
Earnings per share - diluted (in dollars per share)	$ 0.54	$ 1.12	$ 3.02	$ (0.05)

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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Assets:
Cash and cash equivalents	$ 168,678	$ 352,921
Other long-term investments	1,411	1,137
Derivative financial instruments	8
Total assets	170,097	354,058
Liabilities:
Derivative financial instruments	20,217	339
Total liabilities	20,217	339
Level 1
Assets:
Cash and cash equivalents	168,678	352,921
Other long-term investments	1,411	1,137
Derivative financial instruments	0
Total assets	170,089	354,058
Liabilities:
Derivative financial instruments	0	0
Total liabilities	0	0
Level 2
Assets:
Cash and cash equivalents	0	0
Other long-term investments	0	0
Derivative financial instruments	8
Total assets	8	0
Liabilities:
Derivative financial instruments	20,217	339
Total liabilities	20,217	339
Level 3
Assets:
Cash and cash equivalents	0	0
Other long-term investments	0	0
Derivative financial instruments	0
Total assets	0	0
Liabilities:
Derivative financial instruments	0	0
Total liabilities	$ 0	$ 0

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INVENTORIES (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Inventory, Net, Items Net of Reserve Alternative [Abstract]
Raw materials	$ 59,684	$ 35,150
Work in process	13,119	8,117
Finished goods	72,980	28,659
Total	$ 145,783	$ 71,926

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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018
Goodwill [Line Items]
Goodwill	$ 708,390,000		$ 708,390,000		$ 101,083,000
Goodwill, acquired			606,621,000
Goodwill, foreign exchange gain (loss)			686,000
Intangible assets acquired					$ 844,800,000
Amortization of intangible assets	16,926,000	$ 1,780,000	43,244,000	$ 5,716,000
Goodwill, impairment	0
Electronic Materials
Goodwill [Line Items]
Goodwill	358,108,000		358,108,000
Performance Materials
Goodwill [Line Items]
Goodwill	$ 350,282,000		$ 350,282,000

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GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Other intangible assets subject to amortization:
Other intangible assets subject to amortization, gross carrying amount	$ 885,043	$ 85,163
Other intangible assets subject to amortization, accumulated amortization	94,179	51,131
Other intangible assets not subject to amortization:
Other intangible assets not subject to amortization	47,170	1,170
Other intangible assets	932,213	86,333
Other indefinite-lived intangibles
Other intangible assets not subject to amortization:
Other intangible assets not subject to amortization	47,170	1,170
Product technology, trade secrets and know-how
Other intangible assets subject to amortization:
Other intangible assets subject to amortization, gross carrying amount	134,415	48,825
Other intangible assets subject to amortization, accumulated amortization	34,598	25,305
Acquired patents and licenses
Other intangible assets subject to amortization:
Other intangible assets subject to amortization, gross carrying amount	10,570	8,270
Other intangible assets subject to amortization, accumulated amortization	8,356	8,252
Customer relationships, trade names, and distribution rights
Other intangible assets subject to amortization:
Other intangible assets subject to amortization, gross carrying amount	740,058	28,068
Other intangible assets subject to amortization, accumulated amortization	$ 51,225	$ 17,574

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GOODWILL AND OTHER INTANGIBLE ASSETS - Amortization Expense (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Estimated Amortization Expense
Remainder of 2019	$ 16,931
2020	87,940
2021	87,243
2022	79,832
2023	$ 67,674

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OTHER LONG-TERM ASSETS (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Other long-term assets [Abstract]
Long-term contract assets	$ 674	$ 1,548
Long-term SERP Investment	1,411	1,137
Prepaid unamortized debt issuance cost - revolver	752	0
Other long-term assets	2,821	1,979
Total	$ 5,658	$ 4,664

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ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Oct. 01, 2018	Sep. 30, 2018
Payables and Accruals [Abstract]
Accrued compensation	$ 31,362		$ 35,367
Income taxes payable	14,418		18,045
Dividends payable	12,879		10,822
Taxes, other than income taxes	6,806		1,976
KMG - Bernuth warehouse fire related (See Note 12)	4,450		0
Accrued interest	3,677		0
Contract liabilities	3,958	$ 5,310
Contract liabilities			4,894
Goods and services received, not yet invoiced	3,772		1,954
Other accrued expenses	13,939		9,925
Total	$ 95,261	$ 82,936	$ 82,983

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DEBT - Narrative (Details) - USD ($)		3 Months Ended	9 Months Ended
	Apr. 30, 2019	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Nov. 15, 2018	Sep. 30, 2018
Long-term Debt, Unclassified [Abstract]
Debt, face amount						$ 1,265,000,000.0
Percentage of initial principal payment amount						0.25%
Repayment of long-term debt			$ 102,663,000	$ 144,375,000
Current portion of long-term debt		$ 13,313,000	13,313,000				$ 0
Debt issuance costs		18,655,000	$ 18,655,000
Percentage of debt hedged by interest rate swaps					70.00%
Term Loan Facility
Long-term Debt, Unclassified [Abstract]
Debt, face amount						$ 1,065,000,000.0
Debt, term			7 years
Debt requirements, annual excess cash flow						50.00%
Debt requirements, net cash proceeds of recovery events and non-ordinary course asset sales						100.00%
Repayment of long-term debt	$ 55,000,000.0	100,000,000.0
Fair value of debt		962,338,000	$ 962,338,000
Current portion of long-term debt		13,313,000	13,313,000
Debt issuance costs		$ 18,655,000	$ 18,655,000
Term Loan Facility | LIBOR Floor
Long-term Debt, Unclassified [Abstract]
Basis spread on variable rate			0.00%
Term Loan Facility | LIBOR
Long-term Debt, Unclassified [Abstract]
Basis spread on variable rate			2.25%
Term Loan Facility | Base rate
Long-term Debt, Unclassified [Abstract]
Basis spread on variable rate			1.25%
Revolving Credit Facility
Long-term Debt, Unclassified [Abstract]
Debt, face amount						$ 200,000,000
Line of credit facility, borrowing capacity						200,000,000.0
Commitment fee percentage			0.25%
Debt, term			5 years
Revolving Credit Facility | LIBOR
Long-term Debt, Unclassified [Abstract]
Basis spread on variable rate			1.50%
Revolving Credit Facility | Base rate
Long-term Debt, Unclassified [Abstract]
Basis spread on variable rate			0.50%
Letter of credit sub-facility
Long-term Debt, Unclassified [Abstract]
Line of credit facility, borrowing capacity						$ 50,000,000.0
Credit Agreement | Maximum
Long-term Debt, Unclassified [Abstract]
Secured net leverage ratio			4.00

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DEBT - Principal Repayments (Details) - Term Loan Facility $ in Thousands	Jun. 30, 2019 USD ($)
Principal Repayments
Remainder of 2019	$ 5,325
2020	10,650
2021	10,650
2022	10,650
2023	10,650
Greater than 5 years	914,413
Total	$ 962,338

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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 KRW (₩)
Derivative Instruments [Abstract]
Unrealized gain (loss) on cash flow hedging instruments		$ (15,487)
Gain (loss) reclassified from accumulated other comprehensive income into interest expense, estimated time to transfer	12 months
Interest rate swap
Derivative Instruments [Abstract]
Derivative notional amount	$ 746,000	746,000
Unrealized gain (loss) on cash flow hedging instruments	(15,536)	(15,536)
Reclassified from accumulated other comprehensive income into interest expense	4,274
Foreign contracts | Buy
Derivative Instruments [Abstract]
Derivative notional amount	9,636	9,636	$ 7,652
Foreign contracts | Sell
Derivative Instruments [Abstract]
Derivative notional amount	$ 17,880	$ 17,880	$ 24,860
Net investment hedge
Derivative Instruments [Abstract]
Derivative notional amount | ₩				₩ 100,000,000,000

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DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value of Derivative Instruments in the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Derivatives designated as hedging instruments | Interest rate swap | Accrued expenses, income taxes payable and other current liabilities
Derivatives, Fair Value [Line Items]
Derivative assets	$ 0	$ 0
Derivative liabilities	4,274	0
Derivatives designated as hedging instruments | Interest rate swap | Other long-term liabilities
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Derivative liabilities	15,753	0
Derivatives not designated as hedging instruments | Foreign contracts | Accrued expenses, income taxes payable and other current liabilities
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Derivative liabilities	190	339
Derivatives not designated as hedging instruments | Foreign contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	0	8
Derivative liabilities	$ 0	$ 0

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DERIVATIVE FINANCIAL INSTRUMENTS - Effect of Derivative Instruments on the Consolidated Statement of Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivatives not designated as hedging instruments | Foreign contracts | Other income (expense), net
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Other income (loss), net	$ (29)	$ (1,080)	$ (67)	$ (1,002)

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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Nov. 15, 2018	Jun. 30, 2019	Jun. 30, 2019
Postretirement Obligations in Foreign Jurisdictions [Abstract]
Expected term for benefit payments of all unfunded plans			10 years
Expected future benefit payments		$ 7,906	$ 7,906
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase obligation		8,859	8,859
KMG-Bernuth
Environmental Exit Cost [Line Items]
Loss contingency		4,200	4,200
Remediation expense recognized		250
Estimated remediation cost	$ 22,000
Estimated reserve, remaining		$ 1,008	$ 1,008

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,025,867	$ 1,008,167	$ 666,692	$ 635,511	$ 601,667	$ 595,037	$ 666,692	$ 595,037
Foreign currency translation adjustments	2,699	(992)	2,425	(8,829)	3,961	7,144	4,132	2,276
Net unrealized loss on available-for-sale securities	0			(48)		(46)	0	(48)
Change in fair value, net of tax							(15,487)
Change in fair value, net of tax								319
Reclassification adjustment into earnings, net of tax							(31)
Reclassification adjustment into earnings, net of tax								(382)
Balance at end of period	1,025,333	1,025,867	1,008,167	634,181	635,511	601,667	1,025,333	634,181
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Foreign currency translation adjustment, tax							564	(2,303)
Unrealized loss on available-for-sale securities, tax								0
Change in fair value, tax							(4,500)
Change in fair value, tax								111
Reclassification adjustment into earnings, tax							(9)
Reclassification adjustment into earnings, tax								(133)
Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(502)	6,713	4,539	15,201	11,246	3,949	4,539	3,949
Foreign currency translation adjustments	2,699	(992)	2,425	(8,829)	3,961	7,144
Net unrealized loss on available-for-sale securities				(48)		(46)
Balance at end of period	(6,847)	$ (502)	6,713	6,114	$ 15,201	11,246	(6,847)	6,114
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			5,918			5,239	5,918	5,239
Foreign currency translation adjustments							4,132	2,276
Balance at end of period	10,050			7,515			10,050	7,515
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			(17)				(17)
Change in fair value, net of tax							(15,487)
Reclassification adjustment into earnings, net of tax							(31)
Balance at end of period	(15,535)						(15,535)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period						46		46
Change in fair value, net of tax								319
Reclassification adjustment into earnings, net of tax								(382)
Balance at end of period				(17)				(17)
Pension and Other Postretirement Liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			$ (1,362)			(1,336)	(1,362)	(1,336)
Balance at end of period	$ (1,362)			(1,336)			$ (1,362)	(1,336)
Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period						$ 0		0
Net unrealized loss on available-for-sale securities								(48)
Balance at end of period				$ (48)				$ (48)

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SHARE-BASED COMPENSATION PLANS - Narrative (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2019 USD ($) installment	Jun. 30, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 15,048	$ 14,269
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Number of Vesting Installment | installment	3
Period of Termination to Accelerate Vest Awards to Shares	18 months
Percentage of Accelerate Vest Awards to Number of Shares	150.00%
Stock Option and Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 3,253

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SHARE-BASED COMPENSATION PLANS - Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 3,340	$ 4,186	$ 15,048	$ 14,269
Tax benefit	(670)	(1,023)	(3,121)	(3,272)
Total share-based compensation expense, net of tax	2,670	3,163	11,927	10,997
Cost of sales
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	540	542	2,169	1,896
Research, development and technical
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	390	445	1,733	1,491
Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 2,410	$ 3,199	$ 11,146	$ 10,882

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INCOME TAXES (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 14, 2019	Jan. 01, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax [Abstract]
Effective tax rate			52.10%	18.30%	36.90%	47.00%
Tax benefit adjustment on transition tax obligation	$ 9,128
Corporate statutory rate		21.00%						24.50%
Forecast
Income Tax [Abstract]
Corporate statutory rate							21.00%

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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income	$ 18,878	$ 27,137	$ 13,443	$ 35,171	$ 29,737	$ (3,083)	$ 59,458	$ 61,825
Less: income attributable to participating securities	0			(34)			0	(73)
Earnings available to common shares	$ 18,878			$ 35,137			$ 59,458	$ 61,752
Denominator:
Weighted average common shares (Denominator for basis calculation) (in shares)	29,063,907			25,611,505			28,398,960	25,479,078
Weighted average effect of dilutive securities:
Share-based compensation (in shares)	504,366			707,133			524,565	742,786
Diluted weighted average common shares (Denominator for diluted calculation) (in shares)	29,568,273			26,318,638			28,923,525	26,221,864
Earnings per share:
Basic (in dollars per share)	$ 0.65			$ 1.37			$ 2.09	$ 2.42
Diluted (in dollars per share)	$ 0.64			$ 1.34			$ 2.06	$ 2.35
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding stock options excluded from calculation of diluted earnings per share (in shares)	100,000			100,000			200,000	100,000

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SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment			1
Number of reportable segments | segment	2		2
Revenue from External Customer [Line Items]
Revenue	$ 271,882	$ 150,437	$ 759,051	$ 433,394
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Interest expense	(12,757)	(513)	(32,978)	(2,803)
Interest income	417	1,141	2,004	3,248
Depreciation and amortization	(26,587)	(6,410)	(70,476)	(19,527)
Acquisition and integration related expenses	(2,910)	0	(33,108)	0
Charge for fair value write-up of acquired inventory sold	(42)	0	(14,869)	0
Costs related to KMG-Bernuth warehouse fire (See Note 12)	(4,450)	0	(4,450)	0
Income before income taxes	39,428	43,044	94,248	116,688
Unallocated corporate expenses
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Unallocated corporate expenses	(12,527)	(9,715)	(35,621)	(30,471)
Electronic Materials
Revenue from External Customer [Line Items]
Revenue	212,123	143,810	615,586	413,227
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Adjusted EBITDA	70,859	57,460	220,594	162,641
Performance Materials
Revenue from External Customer [Line Items]
Revenue	59,759	6,627	143,465	20,167
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Adjusted EBITDA	$ 27,425	$ 1,081	$ 63,152	$ 3,600

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Label	Element	Value
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (933,000)
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (933,000)