10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

 FORM 10‑Q

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

OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended

MARCH 31, 2013

or

o 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

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 X NO

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted 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 and post such files).

YES X NO

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

           Large accelerated filer X               Accelerated filer               Non-accelerated filer            Smaller reporting company

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

YES NO X

As of April 30, 2013, the Company had 23,271,925 shares of Common Stock, par value $0.001 per share, outstanding.

1

CABOT MICROELECTRONICS CORPORATION

INDEX

Part I. Financial Information		Page
Item 1.	Financial Statements
	Consolidated Statements of Income Three and Six Months Ended March 31, 2013 and 2012	3
	Consolidated Statements of Comprehensive Income Three and Six Months Ended March 31, 2013 and 2012	4
	Consolidated Balance Sheets March 31, 2013, and September 30, 2012	5
	Consolidated Statements of Cash Flows Six Months Ended March 31, 2013 and 2012	6
	Notes to the Consolidated Financial Statements	7
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	20
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	29
Item 4.	Controls and Procedures	30
Part II. Other Information
Item 1.	Legal Proceedings	31
Item 1A.	Risk Factors	31
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	36
Item 6.	Exhibits	37
	Signatures	38

2

PART I. FINANCIAL INFORMATION

ITEM 1.

CABOT MICROELECTRONICS CORPORATION

CONSOLIDATED STATEMENTS OF INCOME

(Unaudited and in thousands, except per share amounts)

	Three Months Ended				Six Months Ended
	March 31,				March 31,
	2013		2012		2013		2012
Revenue	$	100,364	$	99,236	$	206,897	$	201,358
Cost of goods sold		52,019		53,442		108,513		106,285
Gross profit		48,345		45,794		98,384		95,073
Operating expenses:
Research, development and technical		15,073		14,071		30,389		27,826
Selling and marketing		7,046		7,434		14,155		14,770
General and administrative		12,287		15,177		23,241		28,078
Total operating expenses		34,406		36,682		67,785		70,674
Operating income		13,939		9,112		30,599		24,399
Interest expense		872		354		1,825		393
Other income (expense), net		463		97		1,317		201
Income before income taxes		13,530		8,855		30,091		24,207
Provision for income taxes		4,110		3,325		10,968		8,262
Net income	$	9,420	$	5,530	$	19,123	$	15,945
Basic earnings per share	$	0.41	$	0.24	$	0.84	$	0.70
Weighted average basic shares outstanding		22,974		22,768		22,914		22,624
Diluted earnings per share	$	0.40	$	0.23	$	0.81	$	0.68
Weighted average diluted shares outstanding		23,871		23,780		23,755		23,378
Dividends per share	$	-	$	15.00	$	-	$	15.00

The accompanying notes are an integral part of these consolidated financial statements.

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CABOT MICROELECTRONICS CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited and in thousands)

	Three Months Ended						Six Months Ended
	March 31,						March 31,
	2013			2012			2013			2012
Net income	$	9,420		$	5,530		$	19,123		$	15,945
Other comprehensive income, net of tax:
Foreign currency translation adjustments		(7,055	)		(1,235	)		(11,751	)		(372	)
Other comprehensive income, net of tax		(7,055	)		(1,235	)		(11,751	)		(372	)
Comprehensive income	$	2,365		$	4,295		$	7,372		$	15,573

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)

	March 31, 2013			September 30, 2012
ASSETS
Current assets:
Cash and cash equivalents	$	188,354		$	178,459
Accounts receivable, less allowance for doubtful accounts of $4,061 at March 31, 2013, and $4,757 at September 30, 2012		51,220			53,506
Inventories		66,075			66,472
Prepaid expenses and other current assets		13,546			12,608
Deferred income taxes		6,851			6,843
Total current assets		326,046			317,888
Property, plant and equipment, net		112,632			125,020
Goodwill		43,916			44,620
Other intangible assets, net		11,025			12,473
Deferred income taxes		4,500			5,879
Other long-term assets		12,733			11,945
Total assets	$	510,852		$	517,825
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	13,913		$	19,542
Accrued expenses, income taxes payable and other current liabilities		29,411			32,738
Current portion of long-term debt		10,938			10,937
Capital lease obligations		-			2
Total current liabilities		54,262			63,219
Long-term debt, net of current portion		157,500			161,875
Deferred income taxes		1,661			2,017
Capital lease obligations, net of current portion		-			19
Other long-term liabilities		7,286			7,104
Total liabilities		220,709			234,234
Commitments and contingencies (Note 10)
Stockholders' equity:
Common Stock: Authorized: 200,000,000 shares, $0.001 par value; Issued: 29,590,023 shares at March 31, 2013, and 28,864,527 shares at September 30, 2012		30			29
Capital in excess of par value of common stock		350,251			329,782
Retained earnings		148,564			129,441
Accumulated other comprehensive income		18,715			30,466
Treasury stock at cost, 6,319,094 shares at March 31, 2013, and 5,682,288 shares at September 30, 2012		(227,417	)		(206,127	)
Total stockholders' equity		290,143			283,591
Total liabilities and stockholders' equity	$	510,852		$	517,825

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)

	Six Months Ended March 31,
	2013			2012
Cash flows from operating activities:
Net income	$	19,123		$	15,945
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		10,638			11,868
Provision for doubtful accounts		36			3,820
Share-based compensation expense		7,303			7,419
Deferred income tax expense (benefit)		4,061			(1,449	)
Non-cash foreign exchange loss		3,653			1,233
Loss on disposal of property, plant and equipment		44			189
Impairment of property plant and equipment		38			51
Other		(2,279	)		(949	)
Changes in operating assets and liabilities:
Accounts receivable		(1,952	)		(3,297	)
Inventories		(3,284	)		(1,745	)
Prepaid expenses and other assets		(3,485	)		2,856
Accounts payable		(3,817	)		(4,147	)
Accrued expenses, income taxes payable and other liabilities		90			(10,501	)
Net cash provided by operating activities		30,169			21,293
Cash flows from investing activities:
Additions to property, plant and equipment		(5,546	)		(11,641	)
Proceeds from the sale of property, plant and equipment		14			-
Proceeds from the sale of investments		25			50
Net cash used in investing activities		(5,507	)		(11,591	)
Cash flows from financing activities:
Dividends paid		-			(347,140	)
Issuance of long-term debt		-			175,000
Repayment of long-term debt		(4,375	)		-
Repurchases of common stock		(21,290	)		(14,534	)
Net proceeds from issuance of stock		13,159			29,034
Tax benefits associated with share-based compensation expense		707			617
Principal payments under capital lease obligations		(21	)		(5	)
Net cash used in financing activities		(11,820	)		(157,028	)
Effect of exchange rate changes on cash		(2,947	)		(158	)
Increase (decrease) in cash and cash equivalents		9,895			(147,484	)
Cash and cash equivalents at beginning of period		178,459			302,546
Cash and cash equivalents at end of period	$	188,354		$	155,062

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	$	1,171	$	2,385
Issuance of restricted stock		5,926		6,198

The accompanying notes are an integral part of these consolidated financial statements.

6

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'') supplies high-performance polishing slurries and pads used in the manufacture of advanced integrated circuit (IC) devices within the semiconductor industry, in a process called chemical mechanical planarization (CMP).  CMP is a polishing process used by IC device manufacturers to planarize or flatten many of the multiple layers of material that are deposited upon silicon wafers in the production of advanced ICs.  Our products play a critical role in the production of advanced IC devices, thereby enabling our customers to produce smaller, faster and more complex IC devices with fewer defects.  We develop, produce and sell CMP slurries for polishing many of the conducting and insulating materials used in IC devices, and also for polishing the disk substrates and magnetic heads used in hard disk drives.  We also develop, manufacture and sell CMP polishing pads, which are used in conjunction with slurries in the CMP process.  We also pursue other demanding surface modification applications through our Engineered Surface Finishes (ESF) business where we believe we can leverage our expertise in CMP consumables for the semiconductor industry to develop products for demanding polishing applications in other industries. 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, 2012.

The unaudited consolidated financial statements have been prepared by Cabot Microelectronics Corporation pursuant to the rules of the Securities and Exchange Commission (SEC) and accounting principles generally accepted in the United States of America.  In the opinion of management, these unaudited consolidated financial statements include all normal recurring adjustments necessary for the fair presentation of Cabot Microelectronics' financial position as of March 31, 2013, cash flows for the six months ended March 31, 2013 and March 31, 2012, and results of operations for the three and six months ended March 31, 2013 and March 31, 2012.  The results of operations for the three and six months ended March 31, 2013 may not be indicative of results to be expected for future periods, including the fiscal year ending September 30, 2013.  These unaudited consolidated financial statements 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, 2012.

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 March 31, 2013.

Results of Operations

The results of operations for the six months ended March 31, 2013 include a foreign tax adjustment, which was recorded during the first quarter of fiscal 2013, to correct prior period amounts, which we determined to be immaterial to the prior periods to which it relates and is expected to be immaterial to our full fiscal year 2013 results.  This adjustment reduced net income for the first six months of fiscal 2013 by $1,686 and diluted earnings per share by approximately $0.07.  The adjustment relates to the reversal of a deferred tax asset for cumulative net operating losses (NOLs) associated with our facility in South Korea since its opening in fiscal year 2011, as these NOLs are expected to be consumed during periods a tax holiday is in effect.

7

CABOT MICROELECTRONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

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

2. 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 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 March 31, 2013 and September 30, 2012.  See Note 8 for a detailed discussion of our long-term debt.  We have chosen to not measure any of our other financial instruments at fair value as we believe their carrying value approximates their fair value.  We have classified the following assets 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.

March 31, 2013	Level 1		Level 2		Level 3		Total Fair Value
Cash and cash equivalents	$	188,354	$	-	$	-	$	188,354
Auction rate securities (ARS)		-		-		7,966		7,966
Other long-term investments		1,274		-		-		1,274
Total	$	189,628	$	-	$	7,966	$	197,594

September 30, 2012	Level 1		Level 2		Level 3		Total Fair Value
Cash and cash equivalents	$	178,459	$	-	$	-	$	178,459
Auction rate securities (ARS)		-		-		7,991		7,991
Other long-term investments		1,082		-		-		1,082
Total	$	179,541	$	-	$	7,991	$	187,532

Our cash and cash equivalents consist of various bank accounts used to support our operations and investments in institutional money-market funds which are traded in active markets.  The ARS and other long-term investments are included in other long-term assets on our Consolidated Balance Sheet.  The fair value of our long-term ARS is determined through two discounted cash flow analyses, one using a discount rate based on a market index comprised of tax exempt variable rate demand obligations and one using a discount rate based on the LIBOR swap curve, adding a risk factor to reflect current liquidity issues in the ARS market.  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 such time a participant makes a qualifying withdrawal.  The long-term asset was adjusted to $1,274 in the second quarter of fiscal 2013 to reflect its fair value as of March 31, 2013.

8

CABOT MICROELECTRONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

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

We applied accounting standards regarding the classification and valuation of financial instruments to the valuation of our investment in ARS at March 31, 2013.  Our ARS investments at March 31, 2013 consisted of two tax exempt municipal debt securities with a total par value of $8,200.  The ARS market began to experience illiquidity in early 2008, and this illiquidity continues.  Despite this lack of liquidity, there have been no defaults of the underlying securities and interest income on these holdings continues to be received on scheduled interest payment dates.  Our ARS, when purchased, were generally issued by A-rated municipalities.  Although the credit ratings of both municipalities have been downgraded since our original investment, the ARS are credit enhanced and insured with bond insurance and currently carry a credit rating of AA- by Standard and Poors.

Since an active market for ARS does not currently exist, we determine the fair value of these investments using a Level 3 discounted cash flow analysis and also consider other factors such as the reduced liquidity in the ARS market and nature of the insurance backing.  Key inputs to our discounted cash flow model include projected cash flows from interest and principal payments and the weighted probabilities of improved liquidity or debt refinancing by the issuer.  We also incorporate certain Level 2 market indices into the discounted cash flow analysis, including published rates such as the LIBOR rate, the LIBOR swap curve and a municipal swap index published by the Securities Industry and Financial Markets Association.  The following table presents a reconciliation of the activity in fiscal 2013 for fair value measurements using level 3 inputs:

Balance as of October 1, 2012	$	7,991
Net sales of ARS		(25	)
Balance as of March 31, 2013	$	7,966

Based on our fair value assessment, we determined that one ARS continues to be impaired as of March 31, 2013.  This security has a fair value of $3,016 (par value $3,250).  We assessed the impairment in accordance with the applicable standards and determined that the impairment was due to the lack of liquidity in the ARS market rather than to credit risk.  We have maintained the $234 temporary impairment that we previously recorded.  We believe that this ARS is not permanently impaired because in the event of default by the issuer, we expect the insurance provider would pay interest and principal following the original repayment schedule, and we do not intend to sell the security nor do we believe we will be required to sell the security before the value recovers, which may be at maturity.  We determined that the fair value of the other ARS was not impaired as of March 31, 2013.  In November 2011, the municipality that issued our impaired ARS filed for bankruptcy protection.  We considered this development, in light of the continued insurance backing, and have concluded the impairment we have maintained remains adequate and temporary.  See Note 6 for more information on these investments.

3. ACCOUNTS RECEIVABLE

Accounts receivable, net of allowances for doubtful accounts, was $51,220 as of March 31, 2013 and $53,506 as of September 30, 2012.  The decrease was primarily due to lower revenue generated in the second quarter of fiscal 2013 compared to the fourth quarter of fiscal 2012.  As noted in our Quarterly Report on Form 10-Q for the period ended March 31, 2012, we recorded $3,727 in bad debt expense for Elpida Memory, Inc. (Elpida), a significant customer in Japan that filed for bankruptcy protection in February 2012.  We have maintained a reserve for the entire balance as collection of any or all of this balance remains uncertain.  Elpida has been paying the Company on a current basis for all shipments made subsequent to its bankruptcy filing.  The Elpida receivable is denominated in Japanese yen, so it is subject to foreign exchange fluctuations which are included in the table below under the deductions and adjustments.  Our allowance for doubtful accounts changed during the six months ended March 31, 2013 as follows:

Balance as of September 30, 2012	$	4,757
Amounts charged to expense		36
Deductions and adjustments		(732	)
Balance as of March 31, 2013	$	4,061

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CABOT MICROELECTRONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

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

4. INVENTORIES

Inventories consisted of the following:

	March 31,		September 30,
	2013		2012
Raw materials	$	32,675	$	34,591
Work in process		7,358		6,333
Finished goods		26,042		25,548
Total	$	66,075	$	66,472

5. GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill was $43,916 as of March 31, 2013, and $44,620 as of September 30, 2012.  The decrease in goodwill was due to foreign exchange fluctuations of the New Taiwan dollar.

Goodwill and indefinite-lived intangible assets are tested for impairment annually in the fourth quarter of the 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.  Historically, we consistently determined the fair value of our reporting units using a discounted cash flow analysis ("step one") of our projected future results.  Effective September 30, 2011, we adopted a new accounting pronouncement related to our goodwill impairment analysis, which allowed an entity to first perform a qualitative analysis ("step zero") of the fair value of its reporting units to determine whether it is necessary to perform the historical two-step quantitative goodwill analysis.  We used this new guidance in our annual impairment analysis for goodwill in both fiscal 2012 and 2011, determining that it was more likely than not that the carrying amounts of all reporting units exceeded their respective fair values.  The recoverability of indefinite-lived intangible assets was historically measured using the royalty savings method.  In fiscal 2012, we adopted new accounting pronouncements related to our impairment review of indefinite-lived intangible assets, which allows a qualitative assessment of factors used in the impairment review.  Changes in economic and operating conditions that occur after the annual impairment analysis or an interim impairment analysis that impact these assumptions may result in future impairment charges.

We completed our annual impairment test during our fourth quarter of fiscal 2012 and concluded that no impairment existed.  There were no indicators of potential impairment during the quarter ended March 31, 2013, so it was not necessary to perform an impairment review for goodwill and indefinite-lived intangible assets during the quarter.  There have been no cumulative impairment charges recorded on the goodwill of any of our reporting units.

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CABOT MICROELECTRONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

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

The components of other intangible assets are as follows:

	March 31, 2013				September 30, 2012
	Gross Carrying		Accumulated		Gross Carrying		Accumulated
	Amount		Amortization		Amount		Amortization
Other intangible assets subject to amortization:
Product technology	$	8,331	$	5,353	$	8,387	$	4,902
Acquired patents and licenses		8,270		6,985		8,270		6,775
Trade secrets and know-how		2,550		2,550		2,550		2,550
Distribution rights, customer lists and other		12,384		6,812		12,586		6,283
Total other intangible assets subject to amortization		31,535		21,700		31,793		20,510
Total other intangible assets not subject to amortization*		1,190				1,190
Total other intangible assets	$	32,725	$	21,700	$	32,983	$	20,510

*Total other intangible assets not subject to amortization consist primarily of trade names.

Amortization expense on our other intangible assets was $658 and $1,319 for the three and six months ended March 31, 2013, respectively.  Amortization expense on our other intangible assets was $675 and $1,344 for the three and six months ended March 31, 2012, respectively.  Estimated future amortization expense for the five succeeding fiscal years is as follows:

Fiscal Year	Estimated Amortization Expense
Remainder of 2013	$	1,303
2014		2,480
2015		2,412
2016		1,996
2017		1,166

6. OTHER LONG-TERM ASSETS

Other long-term assets consisted of the following:

	March 31,		September 30,
	2013		2012
Auction rate securities	$	7,966	$	7,991
Other long-term assets		3,493		2,872
Other long-term investments		1,274		1,082
Total	$	12,733	$	11,945

11

CABOT MICROELECTRONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

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

As discussed in Note 2 of this Form 10-Q, the two ARS that we owned as of March 31, 2013 are classified as long-term investments.  The securities are credit enhanced and insured with bond insurance and all interest payments continue to be received on a timely basis.  Although we believe these securities will ultimately be collected in full, we believe that it is not likely that we will be able to monetize the securities in our next business cycle (which for us is generally one year).  We maintain a $234 pretax reduction ($151 net of tax) in fair value on one of the ARS that we first recognized in fiscal 2008.  We continue to believe this decline in fair value is temporary based on: (1) the nature of the underlying debt; (2) the presence of bond insurance; (3) the fact that all interest payments have been received; (4) our successful monetization of $25 of this security during the quarter ended March 31, 2013; and (5) our intention not to sell the security nor be required to sell the security until the value recovers, which may be at maturity.

As discussed in Note 2 of this Form 10-Q, we recorded a long-term asset and a corresponding long-term liability of $1,274 representing the fair value of our SERP investments as of March 31, 2013.

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

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

	March 31,		September 30,
	2013		2012
Accrued compensation	$	14,840	$	18,532
Goods and services received, not yet invoiced		3,251		3,478
Deferred revenue and customer advances		3,627		3,341
Warranty accrual		290		359
Income taxes payable		3,731		2,843
Taxes, other than income taxes		1,393		1,041
Other		2,279		3,144
Total	$	29,411	$	32,738

The decrease in accrued compensation was primarily due to the payment of our annual incentive bonus program earned in fiscal 2012, partially offset by two quarters of accrual under our annual incentive bonus program related to fiscal 2013.

12

CABOT MICROELECTRONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

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

8. DEBT

On February 13, 2012, we entered into a credit agreement (the "Credit Agreement") among the Company, as Borrower, Bank of America, N.A., as administrative agent, swing line lender and an L/C issuer, Bank of America Merrill Lynch and J.P. Morgan Securities LLC, as joint lead arrangers and joint book managers, JPMorgan Chase Bank, N.A., as syndication agent, and Wells Fargo Bank, N.A. as documentation agent.  The Credit Agreement provided us with a $175,000 term loan (the "Term Loan"), which we drew on February 27, 2012 to fund approximately half of the special cash dividend we paid to our stockholders on March 1, 2012, and a $100,000 revolving credit facility (the "Revolving Credit Facility"), which remains undrawn, with sub-limits for multicurrency borrowings, letters of credit and swing-line loans.  The Term Loan and the Revolving Credit Facility are referred to as the "Credit Facilities."  The Credit Agreement provides for an uncommitted accordion feature that allows us to request the existing lenders or, if necessary, third-party financial institutions to provide additional capacity in the Revolving Credit Facility, in an amount not to exceed $75,000.  The Term Loan has periodic scheduled principal repayments; however, we may prepay the loan without penalty.  The Credit Facilities are scheduled to expire on February 13, 2017.  In connection with the Credit Agreement, the Company simultaneously terminated its previously existing $50,000 unsecured revolving credit facility, which had no outstanding balance at the time of termination.

Borrowings under the Credit Facilities (other than in respect of swing-line loans) bear interest at a rate per annum equal to the "Applicable Rate" (as defined below) plus, at our option, either (1) a LIBOR rate determined by reference to the cost of funds for deposits in the relevant currency for the interest period relevant to such borrowing or (2) the "Base Rate", which is the highest of (x) the prime rate of Bank of America, N.A., (y) the federal funds rate plus 1/2 of 1.00% and (z) the one-month LIBOR rate plus 1.00%.  The initial Applicable Rate for borrowings under the Credit Facilities was 1.75% with respect to LIBOR borrowings and 0.25% with respect to Base Rate borrowings, with such Applicable Rate subject to adjustment based on our consolidated leverage ratio.  Swing-line loans will bear interest at the Base Rate plus the Applicable Rate for Base Rate loans under the Revolving Credit Facility.  In addition to paying interest on outstanding principal under the Credit Agreement, we pay a commitment fee to the lenders under the Revolving Credit Facility in respect of the unutilized commitments thereunder at a rate ranging from 0.25% to 0.35%, based on our consolidated leverage ratio.  Interest expense and commitment fees are paid according to the relevant interest period and no less frequently than at the end of each calendar quarter.  We paid $2,658 in customary arrangement fees, upfront fees and administration fees, of which $550 and $1,536 remains in prepaid expenses and other current assets and other long-term assets, respectively, on our Consolidated Balance Sheet as of March 31, 2013.  We must also pay letter of credit fees as necessary.  We may voluntarily prepay the Credit Facilities without premium or penalty, subject to customary "breakage" fees and reemployment costs in the case of LIBOR borrowings.  All obligations under the Credit Agreement are guaranteed by each of our existing and future direct and indirect domestic subsidiaries (the "Guarantors").  The obligations under the Credit Agreement and guarantees of those obligations are secured, subject to certain exceptions, by first priority liens and security interests in the assets of the Company and its domestic subsidiaries.

The Credit Agreement contains covenants that restrict the ability of the Company and its subsidiaries to take certain actions, including, among other things and subject to certain significant exceptions: creating liens, incurring indebtedness, making investments, engaging in mergers, selling property, paying dividends or amending organizational documents.  The Credit Agreement requires us to comply with certain financial ratio maintenance covenants, including a maximum consolidated leverage ratio of 3.00 to 1.00 through June 30, 2013 and a minimum consolidated fixed charge coverage ratio of 1.25 to 1.00.  The maximum consolidated leverage ratio decreases to 2.75 to 1.00 between July 1, 2013 and June 30, 2014 and to 2.50 to 1.00 from July 1, 2014 through the termination of the Credit Agreement.As of March 31, 2013, our consolidated leverage ratio was 1.50 to 1.00 and our consolidated fixed charge coverage ratio was 6.61 to 1.00.  The Credit Agreement also contains customary affirmative covenants and events of default.  We believe we are in compliance with these covenants.

13

CABOT MICROELECTRONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

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

At March 31, 2013, the fair value of the Term Loan approximates its carrying value of $168,438 as the loan bears a floating market rate of interest.  As of March 31, 2013, $10,938 of the debt outstanding is classified as short-term.

Principal repayments of the Term Loan are generally made on the last calendar day of each quarter if that day is considered to be a business day.  As of March 31, 2013, scheduled principal repayments of the Term Loan were as follows:

Fiscal Year	Principal Repayments
Remainder of 2013	$	6,563
2014		10,938
2015		15,312
2016		21,875
2017		113,750
Total	$	168,438

9. DERIVATIVE FINANCIAL INSTRUMENTS

Periodically 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.  Our 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 or expense in the accompanying consolidated income statements in the period in which the exchange rates change.  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 balance sheet at fair value.  At March 31, 2013, we had one forward foreign exchange contract to sell Japanese yen related to intercompany notes with one of our subsidiaries in Japan and for the purpose of hedging the risk associated with a net transactional exposure in Japanese yen.

The fair value of our derivative instrument included in the Consolidated Balance Sheet, which was determined using level 2 inputs, was as follows:

		Asset Derivatives		Liability Derivatives
	Balance Sheet Location	Fair Value at March 31, 2013	Fair Value at September 30, 2012	Fair Value at March 31, 2013	Fair Value at September 30, 2012
Derivatives not designated as hedging instruments
Foreign exchange contracts	Prepaid expenses and other current assets	$   59	$    38	$    -	$    -
	Accrued expenses and other current liabilities	$      -	$      -	$    -	$    -

14

CABOT MICROELECTRONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

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

The following table summarizes the effect of our derivative instrument on our Consolidated Statement of Income for the three and six months ended March 31:

		Gain (Loss) Recognized in Statement of Income
		Three Months Ended		Six Months Ended
	Statement of Income Location	March 31, 2013	March 31, 2012	March 31, 2013	March 31, 2012
Derivatives not designated as hedging instruments
Foreign exchange contracts	Other income (expense), net	$82	$468	$323	$468

10. CONTINGENCIES

LEGAL PROCEEDINGS

While we are not involved in any legal proceedings that we believe will have a material impact on our consolidated financial position, results of operations or cash flows, we periodically become a party to legal proceedings in the ordinary course of business.  For example, in 2011, we concluded litigation in the United States against a competitor in which the validity of certain of our CMP slurry patents for tungsten CMP was upheld, although the specific competitive products at issue were found to not infringe the claims at issue.

Refer to Note 16 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, 2012, for additional information regarding commitments and contingencies.

PRODUCT WARRANTIES

We maintain a warranty reserve that reflects management's best estimate of the cost to replace product that does not meet customers' specifications and performance requirements, and costs related to such replacement.  The warranty reserve is based upon a historical product replacement rate, adjusted for any specific known conditions or circumstances.  Additions and deductions to the warranty reserve are recorded in cost of goods sold.  Our warranty reserve requirements changed during the first six months of fiscal 2013 as follows:

Balance as of September 30, 2012	$	359
Reserve for product warranty during the reporting period		426
Settlement of warranty		(495	)
Balance as of March 31, 2013	$	290

15

CABOT MICROELECTRONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

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

11. SHARE-BASED COMPENSATION PLANS

We issue share-based payments under the following programs: our 2012 Omnibus Incentive Plan (OIP) and our Cabot Microelectronics Corporation 2007 Employee Stock Purchase Plan, as Amended and Restated January 1, 2010 (ESPP).  Prior to March 2012, when our stockholders approved our new OIP, we issued share-based payments under our Second Amended and Restated Cabot Microelectronics Corporation 2000 Equity Incentive Plan, as amended and restated September 23, 2008 (EIP); our ESPP, and, pursuant to our EIP, our Directors' Deferred Compensation Plan, as amended September 23, 2008, and our 2001 Executive Officer Deposit Share Program.  For additional information regarding these programs, refer to Note 11 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, 2012.  Other than the ESPP, all share-based payments granted beginning March 6, 2012 are being made from the OIP, and the EIP is no longer available for any awards.

We record share-based compensation expense for all share-based awards, including stock option grants, restricted stock and restricted stock unit awards and employee stock 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 model to estimate the grant date fair value of our stock options and employee stock 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 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 we add a slight premium to this expected term for employees who meet the definition of retirement eligible pursuant to their grants during the contractual term of the grant.  The risk-free rate is derived from the U.S. Treasury yield curve in effect at the time of grant.

Share-based compensation expense for the three and six months ended March 31, 2013, and 2012, was as follows:

	Three Months Ended				Six Months Ended
	March 31,				March 31,
	2013		2012		2013		2012
Cost of goods sold	$	403	$	366	$	915	$	747
Research, development and technical		310		255		676		545
Selling and marketing		324		292		710		769
General and administrative		2,772		3,113		5,002		5,358
Total share-based compensation expense		3,809		4,026		7,303		7,419
Tax benefit		1,345		1,300		2,531		2,356
Total share-based compensation expense, net of tax	$	2,464	$	2,726	$	4,772	$	5,063

Our non-employee directors received annual equity awards in March 2013, pursuant to the OIP.  The award agreements provide for immediate vesting of the award at the time of termination of service for any reason other than by reason of Cause, Death, Disability or a Change in Control, as defined in the OIP, if at such time the non-employee director has completed an equivalent of at least two full terms as a director of the Company, as defined in the Company's bylaws.  Five of the Company's non-employee directors had completed at least two full terms of service as of the date of the March 2013 award.  Consequently, the requisite service period for the award has already been satisfied and we recorded the fair value of $755 of the awards to these five directors to share-based compensation expense in the fiscal quarter ended March 31, 2013 rather than recording that expense over the one-year vesting period stated in the award agreement, as is done for the other three non-employee directors.

16

CABOT MICROELECTRONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

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

For additional information regarding the estimation of fair value, refer to Note 11 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, 2012.

12. OTHER INCOME (EXPENSE), NET

Other income, net, consisted of the following:

	Three Months Ended				Six Months Ended
	March 31,				March 31,
	2013		2012		2013		2012
Interest income	$	33	$	28	$	78	$	79
Other income (expense)		430		69		1,239		122
Total other income (expense), net	$	463	$	97	$	1,317	$	201

The increase in other income was primarily due to the impact of foreign currency fluctuations on monetary assets and liabilities denominated in currencies other than the functional currency, primarily related to the weakening of the Japanese yen against the U.S. dollar.  The increase in other income is net of the gains and losses incurred on forward foreign exchange contracts discussed in Note 9 of this Form 10-Q.

13. INCOME TAXES

Our effective income tax rate was 30.4% and 36.4% for the three and six months ended March 31, 2013 compared to a 37.5% and 34.1% effective income tax rate for the three and six months ended March 31, 2012.  The increase in the effective tax rate during the first six months of fiscal 2013 was primarily due to the recognition of a $1,686 foreign tax adjustment during the quarter ended December 31, 2012, as discussed in Note 1 under the heading "Results of Operations", and the recognition of a $1,015 valuation allowance on a deferred tax asset during the quarter ended March 31, 2013, related to a former equity investment in an entity that was legally dissolved during the quarter.  The former equity investment, which had been fully impaired in fiscal 2007 for financial book purposes, represents a capital asset for tax purposes.  Management has determined that it is not likely that capital gains will be generated within the relevant timeframe to offset the capital loss of this investment.  Consequently, a valuation allowance has been established to reduce the deferred tax asset to zero.  The resulting increase in our effective tax rate was partially offset by effects of the reinstatement of the U.S. research and experimentation tax credit, retroactively effective January 1, 2012, as the American Taxpayer Relief Act of 2012 was signed into law on January 2, 2013.  During the quarter ended March 31, 2013, we recorded a $947 discrete tax credit related to qualified research and development spending in fiscal 2012 and we currently estimate we will receive an additional $1,100 in tax benefits for full fiscal year 2013, subject to actual qualified research and development spending as defined by the law.

17

CABOT MICROELECTRONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

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

14. 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				Six Months Ended
	March 31,				March 31,
	2013		2012		2013		2012
Numerator:
Earnings available to common shares	$	9,420	$	5,530	$	19,123	$	15,945
Denominator:
Weighted average common shares		22,973,631		22,768,425		22,914,133		22,623,978
(Denominator for basic calculation)
Weighted average effect of dilutive securities:
Share-based compensation		897,394		1,011,108		840,539		753,824
Diluted weighted average common shares		23,871,025		23,779,533		23,754,672		23,377,802
(Denominator for diluted calculation)
Earnings per share:
Basic	$	0.41	$	0.24	$	0.84	$	0.70
Diluted	$	0.40	$	0.23	$	0.81	$	0.68

For the three months ended March 31, 2013 and 2012, approximately 1.5 million and 0.4 million shares, respectively, attributable to outstanding stock options were excluded from the calculation of diluted earnings per share because the exercise price of the options was greater than the average market price of our common stock and, therefore, their inclusion would have been anti-dilutive.

For the six months ended March 31, 2013 and 2012, approximately 2.0 million and 1.3 million shares, respectively, attributable to outstanding stock options were excluded from the calculation of diluted earnings per share because the exercise price of the options was greater than the average market price of our common stock and, therefore, their inclusion would have been anti-dilutive.

18

CABOT MICROELECTRONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

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

15. FINANCIAL INFORMATION BY INDUSTRY SEGMENT AND PRODUCT LINE

We operate predominantly in one industry segment – the development, manufacture, and sale of CMP consumables.

Revenue generated by product line for the three and six months ended March 31, 2013, and 2012, was as follows:

	Three Months Ended				Six Months Ended
	March 31,				March 31,
Revenue:	2013		2012		2013		2012
Tungsten slurries	$	36,819	$	38,218	$	77,525	$	78,946
Dielectric slurries		29,734		27,209		60,092		55,216
Copper slurry, including barrier and aluminum		17,057		16,061		35,041		32,101
Polishing pads		7,402		7,939		15,866		14,869
Data storage slurries		5,424		5,749		10,486		10,726
Engineered Surface Finishes		3,928		4,060		7,887		9,500
Total revenue	$	100,364	$	99,236	$	206,897	$	201,358

16. NEW ACCOUNTING PRONOUNCEMENTS

In June 2011, the FASB issued ASU No. 2011-05, "Comprehensive Income (Topic 220) – Presentation of Comprehensive Income" (ASU 2011-05).  The provisions of ASU 2011-05 require an entity to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements.  If two separate statements are presented, the statement of other comprehensive income should immediately follow the statement of net income.  ASU 2011-05 became effective for us in the quarter ended December 31, 2012.  The adoption of ASU 2011-05 changed the way we present comprehensive income as we now present comprehensive income in a separate statement immediately following the income statement rather than the prior annual presentation of comprehensive income within the statement of equity and quarterly presentation of comprehensive income within the footnotes to the financial statements.

In February 2013, the FASB issued ASU No. 2013-02, "Comprehensive Income (Topic 220) – Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income" (ASU 2013-02).  The provisions of ASU 2013-02 require an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component.  An entity is also required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified by the respective line items of net income if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period.  For other amounts not required by U.S. GAAP to be reclassified to net income in their entirety, an entity is required to cross reference to other disclosures required under U.S. GAAP.  ASU 2013-02 became effective for us in the quarter ended March 31, 2013.  The adoption of ASU 2013-02 had no impact on our financial statements as we did not have any reclassification adjustments out of accumulated other comprehensive income.

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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 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 Form 10‑Q are forward‑looking.  In particular, the statements herein regarding future sales and operating results; Company and industry growth, contraction or trends; growth or contraction of the markets in which the Company participates; international events, regulatory or legislative activity, or various economic factors; product performance; the generation, protection and acquisition of intellectual property, and litigation related to such intellectual property; new product introductions; development of new products, technologies and markets; natural disasters; the acquisition of or investment in other entities; uses and investment of the Company's cash balance; financing facilities and related debt, payment of principal and interest, and compliance with covenants and other terms; the Company's capital structure; the construction and operation of facilities by the Company; and statements preceded by, followed by or that include the words "intends," "estimates," "plans," "believes," "expects," "anticipates," "should," "could" or similar expressions, are forward‑looking statements.  Forward‑looking statements reflect our current expectations and are inherently uncertain.  Our actual results may differ significantly from our expectations.  We assume no obligation to update this forward‑looking information.  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, 2012, including the consolidated financial statements and related notes thereto.

SECOND QUARTER OF FISCAL 2013 OVERVIEW

The softening of demand within the semiconductor industry that began late in the fourth quarter of our fiscal 2012 continued through our second quarter of fiscal 2013.  Industry reports suggest that demand has been particularly soft for personal computers, which has negatively impacted the DRAM portion of the memory segment of the semiconductor industry and has contributed to softer demand for some of our CMP consumable products.  However, some industry analysts and semiconductor manufacturers continue to predict some strengthening of semiconductor demand during the June and September quarters, which likely would be driven by positive trends in mobile devices and mobile connectivity.  There are many factors, however, that make it difficult for us to predict future revenue trends for our business, including those discussed in Part II, Item 1A entitled "Risk Factors" in this Form 10-Q.

Revenue for our second quarter of fiscal 2013 was $100.4 million, which represented an increase of 1.1% from the second quarter of fiscal 2012 and a decrease of 5.8% from the previous quarter.  The increase from the second quarter of fiscal 2012 was due to growth in our dielectrics slurry business, primarily in South Korea, and increased sales of our copper slurry products, which include slurries for polishing aluminum.  Revenues for all other product lines decreased compared to the year ago quarter.  Compared to the prior quarter, revenues for our data storage slurry products increased, while revenues decreased for all other product lines.  We believe the decrease in revenue from the prior quarter was primarily due to continued soft demand within the semiconductor industry and traditional seasonal weakness that we typically experience in the second quarter of our fiscal year.

20

Gross profit expressed as a percentage of revenue for our second quarter of fiscal 2013 was 48.2%, which represented an increase from 46.1% reported in the second quarter of fiscal 2012 and from 47.0% in our prior quarter.  The increase in gross profit percentage from the second quarter of fiscal 2012 was primarily due to lower variable manufacturing costs and benefits associated with a weaker Japanese yen versus the U.S. dollar, partially offset by a lower-valued product mix.  The increase in gross profit percentage from the prior quarter was primarily due to lower variable and fixed manufacturing costs, including the positive impact of Japanese yen exchange rate changes, partially offset by lower sales volume and a lower-valued product mix.  Our gross profit percentage was 47.6% on a year-to-date basis, which is within the upper half of our full fiscal year 2013 guidance range of 46% to 48%.  However, we may continue to experience fluctuations in our gross profit due to a number of factors, including the extent to which we utilize our manufacturing capacity and fluctuations in our product mix, which may cause our quarterly gross profit to be above or below this annual guidance range.

Operating expenses were $34.4 million in our second quarter of fiscal 2013, compared to $36.7 million in the second quarter of fiscal 2012 and $33.4 million in the previous quarter.  The decrease in operating expenses from the comparable quarter of fiscal 2012 was primarily driven by the absence of bad debt expense related to a customer bankruptcy and costs associated with our 2012 leveraged recapitalization with a special cash dividend, partially offset by higher staffing-related costs, including costs associated with our annual cash incentive bonus program (AIP).  The increase in operating expenses from the prior quarter was primarily due to higher staffing-related costs, partially offset by lower depreciation expense and lower clean room material costs.  We continue to expect full year operating expenses to be in the range of $132 million to $136 million.

Diluted earnings per share for the second quarter of fiscal 2013 were $0.40, which represents an increase from $0.23 reported in the second quarter of fiscal 2012 and a decrease from $0.41 reported in the previous fiscal quarter.  The increase in diluted earnings per share from the second quarter of fiscal 2012 is primarily due to a higher gross profit margin and lower operating expenses, including approximately $0.12 related to the absence of bad debt expense and leveraged recapitalization fees recorded in the prior year quarter.  The decrease in diluted earnings per share from the prior quarter was primarily due to lower revenue, partially offset by a lower effective tax rate due to enacted tax legislation.

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, 2012.  We believe there have been no material changes in our critical accounting estimates during the first six months of fiscal 2013.  See Note 16 of the Notes to the Consolidated Financial Statements for a discussion of new accounting pronouncements.

21

RESULTS OF OPERATIONS

THREE MONTHS ENDED MARCH 31, 2013, VERSUS THREE MONTHS ENDED MARCH 31, 2012

REVENUE

Revenue was $100.4 million for the three months ended March 31, 2013, which represented a 1.1%, or $1.1 million, increase from the three months ended March 31, 2012.  The increase in revenue was driven by a $1.8 million increase due to higher sales volume and $0.6 million due to a higher-priced product mix, partially offset by a $1.4 million decrease in revenue due to foreign exchange rate changes, primarily due to the significant strengthening of the U.S. dollar against the Japanese yen.  Compared to the same quarter last year, we experienced revenue increases in our dielectrics slurry product line and in our copper slurry product line, which include slurries for polishing aluminum.  These increases were partially offset by decreased revenue in our tungsten slurry, polishing pad, data storage slurry and Engineered Surface Finishes (ESF) product lines.

COST OF GOODS SOLD

Total cost of goods sold was $52.0 million for the three months ended March 31, 2013, which represented a decrease of 2.7%, or $1.4 million, from the three months ended March 31, 2012.  The decrease in cost of goods sold was primarily due to $2.0 million from foreign exchange rate changes and $0.9 million due to certain production variances.  These decreases in cost of goods sold were partially offset by a $1.5 million increase due to a higher-cost product mix.

Metal oxides, such as silica, are significant raw materials that we use in many of our CMP slurries.  In an effort to mitigate our risk exposure to rising raw material costs and to increase supply assurance and quality performance requirements, we have entered into multi-year supply agreements with a number of suppliers.  For more information about our supply contracts, see "Tabular Disclosure of Contractual Obligations" in this Quarterly Report on Form 10-Q as well as in Item 7 of Part II of our Annual Report on Form 10-K for the fiscal year ended September 30, 2012.

Our need for additional quantities or different kinds of key raw materials in the future has required, and will continue to require, that we enter into new supply arrangements with third parties.  Future arrangements may result in costs which are different from those in the existing agreements.  In addition, a number of factors could impact the future cost of raw materials, packaging, freight and labor.  We expect to continue to invest in our supply chain to improve product quality, reduce variability and improve our manufacturing product yields.

GROSS PROFIT

Our gross profit as a percentage of revenue was 48.2% for the three months ended March 31, 2013, as compared to 46.1% for the three months ended March 31, 2012.  The increase in gross profit as a percentage of revenue was primarily due to lower variable manufacturing costs, including benefits associated with a weaker Japanese yen versus the U.S. dollar and certain favorable production variances, partially offset by a lower-valued product mix.  We continue to expect our gross profit percentage for full year fiscal 2013 to be within a range of 46% to 48%.

RESEARCH, DEVELOPMENT AND TECHNICAL

Total research, development and technical expenses were $15.1 million for the three months ended March 31, 2013, which represented an increase of 7.1%, or $1.0 million, from the three months ended March 31, 2012.  The increase was primarily due to $1.5 million in higher staffing-related costs, including costs related to our AIP, partially offset by a $0.6 million decrease in depreciation expense as certain equipment is now fully depreciated.

22

Our research, development and technical efforts continue to focus on the following main areas:

· Research related to fundamental CMP technology;

· Development and formulation of new and enhanced CMP consumables products, including collaboration on joint development projects with key customers;

· 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,

· Evaluation and development of new polishing and metrology applications outside of the semiconductor industry.

SELLING AND MARKETING

Selling and marketing expenses were $7.0 million for the three months ended March 31, 2013, which represented a decrease of 5.2%, or $0.4 million, from the three months ended March 31, 2012.  The decrease was primarily due to lower travel-related costs and lower professional fees.

GENERAL AND ADMINISTRATIVE

General and administrative expenses were $12.3 million for the three months ended March 31, 2013, which represented a decrease of 19.0%, or $2.9 million, from the three months ended March 31, 2012.  The decrease was primarily due to $3.9 million in lower bad debt expense, including the absence of $3.7 million recorded in the second quarter of fiscal 2012 associated with a customer bankruptcy, partially offset by $1.0 million in higher staffing-related costs, including costs associated with our AIP.

INTEREST EXPENSE

Interest expense was $0.9 million for the three months ended March 31, 2013, which represented an increase of $0.5 million from the three months ended March 31, 2012.  The increase was due to a full quarter of interest expense recorded on the term loan we entered into in fiscal 2012 to partially fund the special cash dividend we paid in fiscal 2012, compared to approximately one and one-half months of interest in the comparable quarter of fiscal 2012.

OTHER INCOME (EXPENSE), NET

Other income was $0.5 million for the three months ended March 31, 2013 compared to $0.1 million during the three months ended March 31, 2012.  The increase in other income was primarily due to the impact of foreign currency fluctuations on monetary assets and liabilities denominated in currencies other than the functional currency, primarily related to the weakening of the Japanese yen against the U.S. dollar.  The increase in other income is net of the gains and losses incurred on forward foreign exchange contracts discussed in Note 9 of the Notes to the Consolidated Financial Statements.

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PROVISION FOR INCOME TAXES

Our effective income tax rate was 30.4% for the three months ended March 31, 2013 compared to a 37.5% effective income tax rate for the three months ended March 31, 2012.  The decrease in the effective tax rate during the second quarter of fiscal 2013 was primarily due to the reinstatement of the U.S. research and experimentation tax credit, retroactively effective January 1, 2012, as the American Taxpayer Relief Act of 2012 was signed into law on January 2, 2013.  We recorded approximately $0.9 million in discrete income tax benefits related to fiscal 2012 in the second quarter of fiscal 2013 and we currently estimate we will receive an additional $1.1 million in tax benefits for full fiscal year 2013, subject to actual qualified research and development spending as defined by the law.  The decrease in our effective tax rate was partially offset by a $1.0 valuation allowance established on a deferred tax asset related to a past equity investment in an entity that was legally dissolved during the quarter.

NET INCOME

Net income was $9.4 million for the three months ended March 31, 2013 which represented an increase of 70.3%, or $3.9 million, from the three months ended March 31, 2012.  The increase was primarily due to a higher gross profit percentage and lower operating expenses, including the absence of the bad debt expense related to a customer bankruptcy recorded in the second quarter of fiscal 2012.

SIX MONTHS ENDED MARCH 31, 2013, VERSUS SIX MONTHS ENDED MARCH 31, 2012

The results of operations for the six months ended March 31, 2013 include a foreign tax adjustment to correct prior period amounts, which we have determined to be immaterial to the prior periods to which it relates and is expected to be immaterial to our full fiscal year 2013 results.  This adjustment, recorded in the first quarter of fiscal 2013, reduced net income for the first six months of fiscal 2013 by $1.7 million and diluted earnings per share by approximately $0.07.  This adjustment relates to the reversal of a deferred tax asset for cumulative net operating losses (NOLs) associated with our facility in South Korea since its opening in 2011, as these NOLs are expected to be consumed during periods a tax holiday is in effect.

REVENUE

Revenue was $206.9 million for the six months ended March 31, 2013, which represented a 2.8%, or $5.5 million, increase from the six months ended March 31, 2012.  The increase in revenue was driven by a $4.6 million increase due to a higher-priced product mix and a $3.7 million increase in sales volume.  These increases were partially offset by a $1.7 million decrease in revenue due to the effect of foreign exchange rate changes.  On a year-to-date basis, we experienced increased sales within our dielectrics slurry, copper slurry, which includes slurries for polishing aluminum, and polishing pad product lines, partially offset by decreased revenue in our tungsten slurry and ESF product lines.

COST OF GOODS SOLD

Total cost of goods sold was $108.5 million for the six months ended March 31, 2013, which represented an increase of 2.1%, or $2.2 million, from the six months ended March 31, 2012.  The increase in cost of goods sold was primarily due to an $8.8 million increase due to a higher-cost product mix, a $1.7 million increase due to certain production variances and a $0.9 increase in fixed manufacturing costs.  These increases in cost of goods sold were partially offset by a $6.2 million decrease in variable production costs and a $2.3 million decrease due to the effects of foreign exchange rate changes.

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GROSS PROFIT

Our gross profit as a percentage of revenue was 47.6% for the six months ended March 31, 2013, as compared to 47.2% for the six months ended March 31, 2012.  The increase in gross profit as a percentage of revenue was primarily due to higher sales volume and lower variable manufacturing costs, including benefits associated with a weaker Japanese yen versus the U.S. dollar, partially offset by a lower-valued product mix.  Our year-to-date gross profit percentage of 47.6% is within the upper half of our full year fiscal 2013 guidance range of 46% to 48%.

RESEARCH, DEVELOPMENT AND TECHNICAL

Total research, development and technical expenses were $30.4 million for the six months ended March 31, 2013, which represented an increase of 9.2%, or $2.6 million, from the six months ended March 31, 2012.  The increase was primarily due to $2.4 million in higher staffing-related costs, including costs related to our AIP and $0.7 million in higher expenses for clean room materials, partially offset by small decreases in various other types of expense.

SELLING AND MARKETING

Selling and marketing expenses were $14.2 million for the six months ended March 31, 2013, which represented a decrease of 4.2%, or $0.6 million, from the six months ended March 31, 2012.  The decrease was primarily due to lower travel-related expenses.

GENERAL AND ADMINISTRATIVE

General and administrative expenses were $23.2 million for the six months ended March 31, 2013, which represented a decrease of 17.2%, or $4.8 million, from the six months ended March 31, 2012.  The decrease was primarily due to $3.8 million in lower bad debt expense, including $3.7 million related to a customer bankruptcy recorded in the second quarter of fiscal 2012, and $2.6 million in lower professional fees, including the absence of fees associated with our leveraged recapitalization with a special cash dividend completed in March 2012.  These decreases were partially offset by $1.6 million in higher staffing-related costs, including costs associated with our AIP.

INTEREST EXPENSE

Interest expense was $1.8 million for the six months ended March 31, 2013, which represented an increase of $1.4 million from the six months ended March 31, 2012.  The increase was due to interest expense recorded on the term loan we entered into in fiscal 2012 to partially fund the special cash dividend we paid in fiscal 2012.

OTHER INCOME (EXPENSE), NET

Other income was $1.3 million for the six months ended March 31, 2013 compared to $0.2 million during the six months ended March 31, 2012.  The increase in other income was primarily due to the impact of foreign currency fluctuations on monetary assets and liabilities denominated in currencies other than the functional currency, primarily related to the weakening of the Japanese yen against the U.S. dollar.  The increase in other income is net of gains and losses incurred on forward foreign exchange contracts discussed in Note 9 of the Notes to the Consolidated Financial Statements.

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PROVISION FOR INCOME TAXES

Our effective income tax rate was 36.4% for the six months ended March 31, 2013 compared to a 34.1% effective income tax rate for the six months ended March 31, 2012.  The increase in the effective tax rate during fiscal 2013 was primarily due to the recognition of a $1.7 million foreign tax adjustment, as discussed in Note 1 under the heading "Results of Operations", and the recognition of a $1.0 million valuation allowance on a deferred tax asset related to a past equity investment in an entity that was legally dissolved during the quarter ended March 31, 2013.  The increase in our effective tax rate was partially offset by the reinstatement of the U.S. research and experimentation tax credit, retroactively effective January 1, 2012, as the American Taxpayer Relief Act of 2012 was signed into law on January 2, 2013.  We recorded approximately $0.9 million in discrete income tax benefits related to fiscal 2012 in the second quarter of fiscal 2013 and we currently estimate we will receive an additional $1.1 million in tax benefits for full fiscal year 2013, subject to actual qualified research and development spending as defined by the law.

NET INCOME

Net income was $19.1 million for the six months ended March 31, 2013 which represented an increase of 19.9%, or $3.2 million, from the six months ended March 31, 2012.  The increase was primarily due to increased sales volume, lower operating expense, and a higher gross profit percentage, partially offset by higher interest expense and a higher effective tax rate.

LIQUIDITY AND CAPITAL RESOURCES

We generated $30.2 million in cash flows from operating activities in the first six months of fiscal 2013, compared to $21.3 million in cash from operating activities in the first six months of fiscal 2012.  Our cash flows provided by operating activities in the first six months of fiscal 2013 originated from $19.1 million in net income, $23.5 million in non-cash items and a $12.4 million decrease in cash flow due to a net increase in working capital.  The increase in cash flows from operating activities compared to the first six months of fiscal 2012 was primarily due to increased net income and changes in the timing and amount of prepaid expense, accrued expense and income tax payments.

In the first six months of fiscal 2013, cash flows used in investing activities were $5.5 million for purchases of property, plant and equipment.  In the first six months of fiscal 2012, cash flows used in investing activities were $11.6 million for purchases of property, plant and equipment, including payments to complete our manufacturing facility in South Korea, which we opened in fiscal 2011.  We estimate our total capital expenditures in fiscal 2013 will be approximately $20.0 million, which is down from our previous guidance of between $20.0 million and $25.0 million.

In the first six months of fiscal 2013, cash flows used in financing activities were $11.8 million.  We used $20.0 million to repurchase common stock under our share repurchase program and $1.3 million to repurchase common stock pursuant to the terms of our Second Amended and Restated Cabot Microelectronics Corporation 2000 Equity Incentive Plan (EIP) and our 2012 Omnibus Incentive Plan (OIP) for shares withheld from award recipients to cover payroll taxes on the vesting of restricted stock granted under the EIP and OIP.  We also used $4.4 million to repay long-term debt.  We received $13.2 million from the issuance of common stock related to the exercise of stock options granted under our EIP and the sale of shares to our employees under our 2007 Employee Stock Purchase Plan, as amended and restated January 1, 2010 (ESPP), and we received $0.7 million in tax benefits related to exercises of stock options and vesting of restricted stock granted under our EIP and OIP.  In the first six months of fiscal 2012, cash flows used in financing activities were $157.0 million.  We used $347.1 million to fund the special cash dividend in March 2012, $13.0 million to repurchase common stock under our share repurchase program and $1.5 million to repurchase common stock pursuant to the terms of our EIP for shares withheld from employees to cover payroll taxes on the vesting of restricted stock granted under the EIP.  We received $175.0 million from the drawdown of our term loan (discussed in Note 8 of the Notes to the Consolidated Financial Statements), $29.0 million from the issuance of common stock related to the exercise of stock options granted under our EIP and the sale of shares to our employees under the ESPP, and we received $0.6 million in tax benefits related to exercises of stock options and vesting of restricted stock granted under our EIP.

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In November 2010, our Board of Directors authorized a share repurchase program for up to $125.0 million of our outstanding common stock, which became effective on the authorization date.  As of December 13, 2011, we had $82.9 million remaining under this share repurchase program.  In conjunction with our capital management initiative that we announced in December 2011, on December 13, 2011, our Board of Directors authorized an increase in the amount available under our share repurchase program to $150.0 million.  We repurchased 597,382 shares for $20.0 million during the first six months of fiscal 2013 and we repurchased 321,000 shares for $13.0 million during the first six months of fiscal 2012 under this expanded program.  As of March 31, 2013, $110.0 million remains outstanding under our share repurchase program.  Share repurchases are made from time to time, depending on market conditions, in open market transactions, at management's discretion.  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.

We entered into a Credit Agreement in February 2012, which provided us with a $175.0 million Term Loan and a $100.0 million Revolving Credit Facility, with sub-limits for multicurrency borrowings, letters of credit and swing-line loans.  The Term Loan and Revolving Credit Facility are referred to as the "Credit Facilities".  The Credit Agreement provides us an uncommitted accordion feature that allows us to request the existing lenders or, if necessary, third-party financial institutions to provide additional capacity in the Revolving Credit Facility, in an amount not to exceed $75.0 million.  The Term Loan has periodic scheduled principal repayments; however, we may prepay the loan without penalty.  The Credit Facilities are scheduled to expire on February 13, 2017.  The Term Loan was drawn on February 27, 2012 and the Revolving Credit Facility remains undrawn.  In connection with the Credit Agreement, we terminated our previously existing $50.0 million unsecured revolving credit facility.  The Credit Agreement contains covenants that restrict the ability of the Company and its subsidiaries to take certain actions, including, among other things and subject to certain significant exceptions: creating liens, incurring indebtedness, making investments, engaging in mergers, selling property, paying dividends or amending organizational documents.  The Credit Agreement requires us to comply with certain financial ratio maintenance covenants, including a maximum consolidated leverage ratio of 3.00 to 1.00 through June 30, 2013 and a minimum consolidated fixed charge coverage ratio of 1.25 to 1.00.  The maximum consolidated leverage ratio decreases to 2.75 to 1.00 between July 1, 2013 and June 30, 2014 and to 2.50 to 1.00 from July 1, 2014 through the termination of the Credit Agreement.  As of March 31, 2013, our consolidated leverage ratio was 1.50 to 1.00 and our consolidated fixed charge coverage ratio was 6.61 to 1.00.  The Credit Agreement also contains customary affirmative covenants and events of default.  We believe we are in compliance with these covenants.  See Note 8 of the Notes to the Consolidated Financial Statements for additional information regarding the Credit Agreement.

As of March 31, 2013, we had $188.4 million of cash and cash equivalents, $33.8 million of which was held in foreign subsidiaries in Singapore and Taiwan where we have made a current election to permanently reinvest the earnings rather than repatriate the earnings to the U.S.  If we choose to repatriate these earnings in the future through dividends or loans to the U.S. parent company, the earnings could become subject to additional income tax expense.

We believe that our current balance of cash and long-term investments, cash generated by our operations and available borrowing capacity under our new Credit Facility will be sufficient to fund our operations, expected capital expenditures, merger and acquisition activities and share repurchases for the foreseeable future.  However, in order to further expand our business, we may need to raise additional funds in the future through equity or debt financing, strategic relationships 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 March 31, 2013, and September 30, 2012, 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 March 31, 2013, and the effect such obligations are expected to have on our liquidity and cash flow in future periods.

CONTRACTUAL OBLIGATIONS			Less Than		1-3		3-5		After 5
(In millions)	Total		1 Year		Years		Years		Years
Long-term debt	$	168.4	$	10.9	$	30.6	$	126.9	$	-
Interest expense and fees on long-term debt		11.4		3.6		5.8		2.0		-
Purchase obligations		173.9		59.4		82.9		31.2		0.4
Operating leases		9.5		3.6		3.5		1.9		0.5
Other long-term liabilities		7.3		-		-		-		7.3
Total contractual obligations	$	370.5	$	77.5	$	122.8	$	162.0	$	8.2

Prior to January 1, 2013, we operated under a fumed silica supply agreement with Cabot Corporation, our former parent company which is not a related party, under which we were generally obligated to purchase at least 90% of our six-month volume forecast for certain of our slurry products, to purchase certain minimum quantities every six months, and to pay for the shortfall if we purchased less than these amounts.  This agreement expired on December 31, 2012.  We did not pay any shortfall under this agreement.  We entered into a new fumed silica supply agreement with Cabot Corporation that became effective as of January 1, 2013 with an initial term of four years.  This new agreement has revised pricing and requires us to purchase certain minimum quantities of fumed silica each year of the agreement, and to pay a shortfall if we purchase less than the minimum.  The purchase obligations in the table above reflect management's expectation that we will meet the minimum purchase quantities each year of the new contract.  We also operated under a fumed alumina supply agreement with Cabot Corporation, which expired in April 2013, under which we were obligated to pay certain fixed, capital and variable costs, and had certain take-or-pay obligations.  We did not pay any shortfall under this agreement.  Purchase obligations include an aggregate amount of $154.5 million of contractual commitments related to our Cabot Corporation agreements for fumed silica.

Interest payments on long-term, variable rate debt reflect LIBOR rates in effect at March 31, 2013.  Commitment fees are based on our estimated consolidated leverage ratio in future periods.  See Note 8 of the Notes to the Consolidated Financial Statements 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, 2012, for additional information regarding our contractual obligations.

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ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

EFFECT OF 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 Japanese yen, the New Taiwan dollar and the Korean won.  Approximately 10% 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, so the net exposure on the Consolidated Statement of Income is generally limited.  From time to time we enter into forward contracts in an effort to manage foreign currency exchange exposure.  However, we are unlikely to be able to hedge these exposures completely.  We do not currently enter into forward exchange contracts or other derivative instruments for speculative or trading purposes.

The significant weakening of the Japanese yen against the U.S. dollar in fiscal 2013 has impacted our gross profit percentage and our other income (expense) on our Consolidated Statement of Income and has significantly impacted accumulated other comprehensive income on our Consolidated Balance Sheet.  The weakening of the yen accounted for an approximate 75 basis point increase in our gross profit percentage during the first six months of fiscal 2013 compared to the same period of fiscal 2012, as currently our yen-denominated cost of goods sold is greater than our yen-denominated revenue.  To a lesser extent, we have also seen a favorable foreign exchange impact on our yen-denominated operating expenses.  Other income has been positively impacted based on the settlement or remeasurement of receivables and payables, including intercompany loans, net of the gains and losses incurred on forward foreign exchange contracts used to hedge the yen exposure.  During the six months ended March 31, 2013, we recorded $7.1 million in currency translation losses, net of tax, that are included in other comprehensive income on our Consolidated Balance Sheet.  These losses primarily relate to changes in the U.S. dollar value of assets and liabilities transacted in yen 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 movement in foreign exchange rates.  As of March 31, 2013, 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.

INTEREST RATE RISK

At March 31, 2013, we have $168.4 million in long-term debt at variable interest rates.  Assuming a hypothetical 100 basis point increase in our current variable interest rate, our interest expense would increase by approximately $0.4 million per quarter.

MARKET RISK RELATED TO INVESTMENTS IN AUCTION RATE SECURITIES

At March 31, 2013, we owned two auction rate securities (ARS) with a total estimated fair value of $8.0 million ($8.2 million par value) which were classified as other long-term assets on our Consolidated Balance Sheet.  Beginning in 2008, general uncertainties in the global credit markets significantly reduced liquidity in the ARS market, and this illiquidity continues.  For more information on our ARS, see Notes 2 and 6 of the Notes to the Consolidated Financial Statements and the "Risk Factors" set forth in Part II, Item 1A of this Quarterly Report on Form 10-Q.

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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 March 31, 2013.  Based on that evaluation, our CEO and CFO have concluded that our disclosure controls and procedures were effective to ensure 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 to ensure that such information is accumulated and communicated to management, including the CEO and CFO, as appropriate to allow timely decisions regarding required disclosure.

While we believe the present design of our disclosure controls and procedures is effective enough to make known to our senior management in a timely fashion all material information concerning our business, we intend to continue to improve the design and effectiveness of our disclosure controls and procedures to the extent we believe necessary in the future to provide our senior management with timely access to such material information, and to correct deficiencies that we may discover in the future, as appropriate.

CHANGES IN INTERNAL CONTROL OVER FINANCIAL REPORTING

There were no changes in our internal control over financial reporting that occurred during our most recent fiscal quarter that have materially affected, or are reasonably likely to materially affect, our 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

While we are not involved in any legal proceedings that we believe will have a material impact on our consolidated financial position, results of operations or cash flows, we periodically become a party to legal proceedings in the ordinary course of business.  For example, in 2011, we concluded litigation in the United States against a competitor in which the validity of certain of our CMP slurry patents for tungsten CMP was upheld, although the specific competitive products at issue were found to not infringe the claims at issue.

ITEM 1A. RISK FACTORS

We do not believe there have been any material changes in our risk factors since the filing of our Annual Report on Form 10-K for the fiscal year ended September 30, 2012.  However, we may update our risk factors in our SEC filings from time to time for clarification purposes or to include additional information, at management's discretion, even when there have been no material changes.

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 our revenue is primarily dependent upon semiconductor demand.  Semiconductor demand, in turn, is impacted by semiconductor industry cycles, and these cycles can dramatically affect our business.  These cycles may be characterized by rapid increases or decreases in product demand, excess or low customer inventories, and rapid changes in prices of IC devices.  For example, following approximately two quarters of soft demand in the semiconductor industry during the first half of our fiscal 2012 that followed approximately two years of growth, we again saw industry demand strengthen somewhat during the second half of our fiscal 2012.  However, late in the fourth quarter of fiscal 2012, we began to see some softening of demand, which continued through the second quarter of fiscal 2013.  In addition, our business has historically experienced some seasonal trends; we experienced seasonally weaker demand in our second quarter of fiscal 2013.  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 experiences further weakness and/or the semiconductor industry weakens, whether in general or as a result of specific factors, such as current macroeconomic factors, or unpredictable natural disasters such as the March 2011 natural disasters in Japan, or the November 2011 flooding in Thailand, that affected the semiconductor, data storage and information technology industries, we could experience material adverse impacts on our results of operations and financial condition.

Adverse global economic and industry conditions may have other negative effects on our Company.  For instance, we may experience negative impacts on cash flows due to the inability of our customers to pay their obligations to us, as evidenced by the $3.7 million bad debt expense we recorded in March 2012, related to a customer bankruptcy filing in Japan in the second quarter of fiscal 2012, or our production process may be harmed if our suppliers cannot fulfill their obligations to us.  We may also have to reduce the carrying value of goodwill and other intangible assets, which could harm our financial position and results of operations.

Some additional factors that affect demand for our products include: the types of products that our customers may produce, such as logic devices versus memory devices; the various technology nodes at which those products are manufactured; customers' specific manufacturing process integration schemes; the short order to delivery time for our products; quarter-to-quarter changes in customer order patterns; market share gains and losses; and pricing changes by us and our competitors.

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WE HAVE A NARROW PRODUCT RANGE AND OUR PRODUCTS MAY BECOME OBSOLETE, OR TECHNOLOGICAL CHANGES MAY REDUCE OR LIMIT INCREASES IN THE CONSUMPTION OF CMP SLURRIES AND PADS

Our business is substantially dependent on a single class of products, CMP slurries, which account for the majority of our revenue.  Our business in CMP pads is also developing.  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 semiconductor industry and to adapt, improve and customize our products for advanced IC applications in response to evolving customer needs and industry trends.  Since its inception, the semiconductor industry has experienced rapid technological changes and advances in the design, manufacture, performance and application of IC devices, and 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, as a means to reduce the costs and increase the yield in their manufacturing facilities.  We expect these technological changes and advances, 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 and to possibly reuse or recycle these products, could render our products less important to the IC device manufacturing process.

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

Our CMP consumables customer base is concentrated among a limited number of large customers.  The larger semiconductor manufacturers are generally growing at a faster rate than the smaller ones, and we have seen the number of semiconductor manufacturers decline both through mergers and acquisitions as well as through strategic alliances.  Industry analysts predict that this trend will continue, which means the semiconductor industry will be comprised of fewer and larger participants if their prediction is correct.  One or more of these principal customers could stop buying CMP consumables from us or could substantially reduce the quantity of CMP consumables 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 CMP consumables sold to these principal customers, or a significant number of smaller customers, could seriously harm our business, financial condition and results of operations.

During the six months ended March 31, 2013 and 2012, our five largest customers accounted for approximately 54% and 47% of our revenue, respectively.  During the six months ended March 31, 2013, Taiwan Semiconductor Manufacturing Company (TSMC) and Samsung were our largest customers accounting for approximately 21% and 14%, respectively, of our revenue.  During the six months ended March 31, 2012, TSMC and Samsung accounted for approximately 17% and 13%, respectively, of our revenue.  During full fiscal year 2012, our five largest customers accounted for approximately 48% of our revenue, with TSMC and Samsung accounting for approximately 18% and 13%, respectively.

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

Competition from other CMP slurry manufacturers could seriously harm our business and results of operations.  Competition from other providers of CMP consumables could continue to increase, and opportunities exist for other companies to emerge as potential competitors by developing their own CMP consumables products.  Increased competition has and may continue to impact the prices we are able to charge for our CMP consumables products as well as our overall business.  In addition, our competitors could have or obtain intellectual property rights which could restrict our ability to market our existing products and/or to innovate and develop new products.

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ANY PROBLEM OR DISRUPTION IN OUR SUPPLY CHAIN, INCLUDING SUPPLY OF OUR MOST IMPORTANT RAW MATERIALS, OR IN OUR ABILITY TO MANUFACTURE AND 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 our supply of the key raw materials we use in our CMP slurries and pads, including fumed silica, which we use for certain of our slurries, or any problem or interruption that may occur during production or delivery of our products, such as weather-related problems or natural disasters, like the March 2011 natural disasters in Japan.  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 material 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, contractual amendments to the existing agreements with, or non-performance by, our suppliers, including any significant financial distress our suppliers may suffer, could adversely affect us.  For instance, Cabot Corporation continues to be our primary supplier of particular amounts and types of fumed silica under a new fumed silica supply agreement for such supply, which became effective as of January 2013.  Also, if we change the supplier or type of key raw materials we use to make our CMP slurries or pads, 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 CMP slurries and pads for their manufacturing processes and products.  The requalification process could take a significant amount of time and expense to complete and could motivate our customers to consider purchasing products from our competitors, possibly interrupting or reducing our sales of CMP consumables to these customers.

WE ARE SUBJECT TO RISKS ASSOCIATED WITH OUR FOREIGN OPERATIONS

We continue to have expanding operations and a large customer base outside of the United States.  Approximately 88% and 87% our revenue was generated by sales to customers outside of the United States for the six months ended March 31, 2013 and full fiscal year ended September 30, 2012, respectively.  We may encounter risks in doing business in certain foreign countries, including, but not limited to, adverse changes in economic and political conditions, fluctuation in exchange rates, compliance with a variety of foreign laws and regulations, as well as difficulty in enforcing business and customer contracts and agreements, including protection of intellectual property rights.  We also may encounter the risks that we may not be able to repatriate earnings from certain of our foreign operations, derive the anticipated tax benefits of our foreign operations or recover the investments made in our foreign operations.

WE DECREASED OUR CASH BALANCE SIGNIFICANTLY AND INCURRED A SUBSTANTIAL AMOUNT OF INDEBTEDNESS IN FISCAL 2012 IN CONJUNCTION WITH OUR LEVERAGED RECAPITALIZATION WITH A SPECIAL CASH DIVIDEND, WHICH MAY ADVERSELY AFFECT OUR CASH FLOW AND OUR ABILITY TO EXPAND OUR BUSINESS, AND WE MAY BE UNABLE TO COMPLY WITH DEBT COVENANTS OR SECURE ADDITIONAL FINANCING, IF NECESSARY OR DESIRED, ON TERMS ACCEPTABLE TO OUR COMPANY

As we discussed in our Quarterly Report on Form 10-Q for the quarter ended March 31, 2012, in conjunction with a new capital management initiative for our Company, we increased the available authorization under our existing share repurchase program and implemented a leveraged recapitalization with a special cash dividend of approximately $347.1 million in aggregate, which we paid in March 2012 by using approximately $172.1 million from our existing cash balance and $175.0 million from a five-year term loan that is part of the credit facility we finalized in February 2012.

33

The accompanying reduction in our cash balance may reduce our flexibility to operate our business as we have in the past, including limiting our ability to invest in organic growth of our Company, pursue acquisitions, and repurchase our stock.  In addition, the indebtedness may adversely affect our future cash flow and our ability to pursue our core strategies of strengthening and growing our business, because the incurrence of debt will require us to dedicate a portion of our cash flow from operations to payments on our indebtedness, thereby reducing the availability of cash flows to fund working capital, capital expenditures, share repurchases, merger and acquisition activities, and other general corporate purposes.  The credit facility contains restrictive covenants that impose operating and financial restrictions, including restrictions on our ability to engage in activities and initiatives that we otherwise might decide to pursue.  These covenants include, among other things, restrictions on our ability to incur additional debt, engage in certain transactions, and pay additional dividends or make other distributions to our stockholders.  The incurrence of debt pursuant to the new credit facility also has required us to incur interest expense charges and other debt related fees that could adversely affect our financial condition and cash flows.

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

Protection of intellectual property is particularly important in our industry because we develop complex technical formulas for CMP 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.  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, such as the previous litigation between us and a competitor, in which the validity of all of our patents at issue in the matter was upheld as further described in Part II, Item 1 under the heading "Legal Proceedings", could seriously harm our business.  In addition, the costs of obtaining or protecting our intellectual property could negatively affect our operating results.

WE MAY PURSUE ACQUISITIONS OF, INVESTMENTS IN, AND STRATEGIC ALLIANCES WITH OTHER ENTITIES, WHICH COULD DISRUPT OUR OPERATIONS AND HARM OUR OPERATING RESULTS IF THEY ARE UNSUCCESSFUL

We expect to continue to make investments in technologies, assets and companies, either through acquisitions, investments or alliances, in order to supplement our internal growth and development efforts.  Acquisitions and investments, involve numerous risks, including the following: difficulties and risks in integrating the operations, technologies, products and personnel of acquired companies; 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 in such markets have stronger market positions; potential difficulties in operating new businesses with different business models; 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, asset acquisition or investments in other entities.  Acquisitions by us could have negative effects on our results of operations, in areas such as contingent liabilities, gross profit 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, as evidenced by the valuation allowance established in the second quarter of fiscal 2013 on a deferred tax asset related to a former equity investment.

34

BECAUSE WE HAVE LIMITED EXPERIENCE IN BUSINESS AREAS OUTSIDE OF CMP SLURRIES, EXPANSION OF OUR BUSINESS INTO NEW PRODUCTS AND APPLICATIONS MAY NOT BE SUCCESSFUL

An element of our strategy has been to leverage our current customer relationships, technological expertise and other capabilities to expand our business beyond CMP slurries into other areas, such as CMP polishing pads and, more broadly, into other electronic materials.  Additionally, in our Engineered Surface Finishes business, we are 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.  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.

WE MAY NOT BE ABLE TO MONETIZE OUR INVESTMENTS IN AUCTION RATE SECURITIES IN THE SHORT TERM AND WE COULD EXPERIENCE A DECLINE IN THEIR MARKET VALUE, WHICH COULD ADVERSELY AFFECT OUR FINANCIAL RESULTS

We owned auction rate securities (ARS) with an estimated fair value of $8.0 million ($8.2 million par value) at March 31, 2013, which were classified as other long-term assets on our Consolidated Balance Sheet.  If current illiquidity in the ARS market does not improve, if issuers of our ARS are unable to refinance the underlying securities, or are unable to pay debt obligations and related bond insurance fails, or if credit ratings decline or other adverse developments occur in the credit markets, then we may not be able to monetize these securities in the foreseeable future.  We may also be required to further adjust the carrying value of these instruments through an impairment charge that may be deemed other-than-temporary which would adversely affect our financial results.

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

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 with other industry participants for qualified personnel, particularly those with significant experience in the semiconductor industry.  The loss of services of key employees could harm our business and results of operations.

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 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 by, and changes in market evaluations of, us or participants in the semiconductor and related industries; changes in business 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 management strategy, including the incurrence of debt; and trading volume of our common stock.

35

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, our 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.

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)
Jan. 1 through Jan. 31, 2013	52,300	$37.05	52,300	$118,062
Feb. 1 through Feb. 28, 2013	224,435	$35.92	224,435	$110,000
Mar. 1 through Mar. 31, 2013	968	$34.99	-	$110,000
Total	277,703	$36.13	276,735	$110,000

In November 2010, our Board of Directors authorized a share repurchase program for up to $125.0 million of our outstanding common stock, which became effective on the authorization date.  As of December 13, 2011, we had $82.9 million remaining under this share repurchase program.  In conjunction with our capital management initiative that we announced in December 2011, on December 13, 2011, our Board of Directors authorized an increase in the amount available under our share repurchase program to $150.0 million.  We repurchased 276,735 shares for $10.0 million during the second quarter of fiscal 2013 under this expanded program.  As of March 31, 2013, $110.0 million remains outstanding under our share repurchase program.  Share repurchases are made from time to time, depending on market conditions, in open market transactions, at management's discretion.  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.

Separate from this share repurchase program, a total of 968 shares were purchased during the second quarter of fiscal 2013 pursuant to the terms of our Second Amended and Restated Cabot Microelectronics Corporation 2000 Equity Incentive Plan (EIP) and our 2012 Omnibus Incentive Plan (OIP) as shares withheld from award recipients and to cover payroll taxes on the vesting of shares of restricted stock granted under the EIP and OIP.

36

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.

37

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
Date: May 9, 2013	/s/ WILLIAM S. JOHNSON
	William S. Johnson
	Vice President and Chief Financial Officer
	[Principal Financial Officer]
Date: May 9, 2013	/s/ THOMAS S. ROMAN
	Thomas S. Roman
	Corporate Controller
	[Principal Accounting Officer]

38

EX-31.1

Exhibit 31.1

CERTIFICATION

I, William P. Noglows, 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 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: May 9, 2013	/s/ WILLIAM P. NOGLOWS
	William P. Noglows
	Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, William S. Johnson, 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 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: May 9, 2013	/s/ WILLIAM S. JOHNSON
	William S. Johnson
	Chief Financial 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 March 31, 2013 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; and

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

Date: May 9, 2013	/s/ WILLIAM P. NOGLOWS
	William P. Noglows
	Chief Executive Officer
Date: May 9, 2013	/s/ WILLIAM S. JOHNSON
	William S. Johnson
	Chief Financial Officer

XML

FAIR VALUE OF FINANCIAL INSTRUMENTS, Schedule of Auction Rate Securities (ARS) Activity (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance as of October 1, 2012	$ 7,991
Net sales of ARS	(25)
Balance as of March 31, 2013	$ 7,966

XML

FINANCIAL INFORMATION BY INDUSTRY SEGMENT, GEOGRAPHIC AREA AND PRODUCT LINE (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 100,364	$ 99,236	$ 206,897	$ 201,358
Property, plant and equipment, net	112,632		112,632		125,020
Revenue from External Customer [Line Items]
Revenue	100,364	99,236	206,897	201,358
Tungsten slurry [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	36,819	38,218	77,525	78,946
Revenue from External Customer [Line Items]
Revenue	36,819	38,218	77,525	78,946
Dielectric slurry [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	29,734	27,209	60,092	55,216
Revenue from External Customer [Line Items]
Revenue	29,734	27,209	60,092	55,216
Copper slurry, including barrier and aluminum [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	17,057	16,061	35,041	32,101
Revenue from External Customer [Line Items]
Revenue	17,057	16,061	35,041	32,101
Polishing pads [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	7,402	7,939	15,866	14,869
Revenue from External Customer [Line Items]
Revenue	7,402	7,939	15,866	14,869
Data storage slurry [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	5,424	5,749	10,486	10,726
Revenue from External Customer [Line Items]
Revenue	5,424	5,749	10,486	10,726
Engineered Surface Finishes [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,928	4,060	7,887	9,500
Revenue from External Customer [Line Items]
Revenue	$ 3,928	$ 4,060	$ 7,887	$ 9,500

XML

DERIVATIVE FINANCIAL INSTRUMENTS, Schedule of the Effect of Derivative Instruments on the Consolidated Statement of Income (Details) (Foreign Exchange Contract [Member], Other Income (Expense), Net [Member], Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Foreign Exchange Contract [Member] | Other Income (Expense), Net [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in statement of income	$ 82	$ 468	$ 323	$ 468

XML

DERIVATIVE FINANCIAL INSTRUMENTS (Details)	Mar. 31, 2013
DERIVATIVE FINANCIAL INSTRUMENTS [Abstract]
Number of forward foreign exchange contracts held	1
Number of subsidiaries in Japan with intercompany notes	1

XML

OTHER INCOME (EXPENSE), NET (Tables)

6 Months Ended

Mar. 31, 2013

OTHER INCOME (EXPENSE), NET [Abstract]

Other income (expense), net

Other income, net, consisted of the following:

	Three Months Ended				Six Months Ended
	March 31,				March 31,
	2013		2012		2013		2012
Interest income	$	33	$	28	$	78	$	79
Other income (expense)		430		69		1,239		122
Total other income (expense), net	$	463	$	97	$	1,317	$	201

XML

INVENTORIES (Tables)

6 Months Ended

Mar. 31, 2013

INVENTORIES [Abstract]

Schedule of inventories

Inventories consisted of the following:

	March 31,		September 30,
	2013		2012
Raw materials	$	32,675	$	34,591
Work in process		7,358		6,333
Finished goods		26,042		25,548
Total	$	66,075	$	66,472

XML

SHARE-BASED COMPENSATION PLANS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Omnibus Incentive Plan [Abstract]
Share based compensation expense			$ 7,303	$ 7,419
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation expense	3,809	4,026	7,303	7,419
Stock based compensation - tax benefit	1,345	1,300	2,531	2,356
Total share-based compensation expense, net of tax	2,464	2,726	4,772	5,063
Number of non-employee directors who have completed two full terms of service	5		5
Fair value of awards for completing minimum full terms of service	755
Cost of Goods Sold [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation expense	403	366	915	747
Research, Development and technical [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation expense	310	255	676	545
Selling and Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation expense	324	292	710	769
General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation expense	$ 2,772	$ 3,113	$ 5,002	$ 5,358

XML

GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012
Goodwill [Roll Forward]
Beginning Balance			$ 44,620
Ending Balance	43,916		43,916
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount subject to amortization	31,535		31,535		31,793
Accumulated Amortization	21,700		21,700		20,510
Other intangible assets [Abstract]
Amortization expense	658	675	1,319	1,344
Indefinite-lived Intangible Assets by Major Class [Line Items]
Gross Carrying Amount not subject to amortization	1,190		1,190		1,190
Estimated future amortization expense [Abstract]
Remainder of 2013	1,303		1,303
2014	2,480		2,480
2015	2,412		2,412
2016	1,996		1,996
2017	1,166		1,166
Total other intangible assets, gross carrying amount	32,725		32,725		32,983
Product Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount subject to amortization	8,331		8,331		8,387
Accumulated Amortization	5,353		5,353		4,902
Acquired Patents and Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount subject to amortization	8,270		8,270		8,270
Accumulated Amortization	6,985		6,985		6,775
Trade Secrets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount subject to amortization	2,550		2,550		2,550
Accumulated Amortization	2,550		2,550		2,550
Distribution Rights, Customer relationships, and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount subject to amortization	12,384		12,384		12,586
Accumulated Amortization	$ 6,812		$ 6,812		$ 6,283

XML

FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
FAIR VALUE OF FINANCIAL INSTRUMENTS [Abstract]
Other long-term investments, Supplemental Employee Retirement Plan (SERP)	$ 1,274
Corresponding SERP liability	1,274
Number of tax exempt municipal debt securities	2
Auction rate securities (ARS) par value	8,200
Number of impaired auction rate securities (ARS)	1
Fair value of impaired security	3,016
Par value of impaired security	3,250
Impairment amount of impaired security	$ 234

XML

INCOME TAXES (1) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended		12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2013	Sep. 30, 2012
Income (loss) from continuing operations before income taxes [Abstract]
Total	$ 13,530		$ 8,855	$ 30,091	$ 24,207
Total U.S. and foreign	4,110		3,325	10,968	8,262
Effective income tax rate reconciliation [Abstract]
Provision for income taxes (in hundredths)	30.40%		37.50%	36.40%	34.10%
Foreign income tax adjustment		1,686		1,686
Research and development tax credit						1,100	947
Valuation allowance on former equity investment	$ 1,015

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DERIVATIVE FINANCIAL INSTRUMENTS, Schedule of Fair Value of Derivative Instruments in the Consolidated Balance Sheet (Details) (Foreign Exchange Contract [Member], Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of foreign exchange contract asset derivatives	$ 59	$ 38
Fair value of foreign exchange contract liability derivatives	0	0
Accrued Expenses and Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of foreign exchange contract asset derivatives	0	0
Fair value of foreign exchange contract liability derivatives	$ 0	$ 0

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ACCOUNTS RECEIVABLE

6 Months Ended

Mar. 31, 2013

ACCOUNTS RECEIVABLE [Abstract]

ACCOUNTS RECEIVABLE

3. ACCOUNTS RECEIVABLE

Accounts receivable, net of allowances for doubtful accounts, was $51,220 as of March 31, 2013 and $53,506 as of September 30, 2012.  The decrease was primarily due to lower revenue generated in the second quarter of fiscal 2013 compared to the fourth quarter of fiscal 2012.  As noted in our Quarterly Report on Form 10-Q for the period ended March 31, 2012, we recorded $3,727 in bad debt expense for Elpida Memory, Inc. (Elpida), a significant customer in Japan that filed for bankruptcy protection in February 2012.  We have maintained a reserve for the entire balance as collection of any or all of this balance remains uncertain.  Elpida has been paying the Company on a current basis for all shipments made subsequent to its bankruptcy filing.  The Elpida receivable is denominated in Japanese yen, so it is subject to foreign exchange fluctuations which are included in the table below under the deductions and adjustments.  Our allowance for doubtful accounts changed during the six months ended March 31, 2013 as follows:

Balance as of September 30, 2012	$	4,757
Amounts charged to expense		36
Deductions and adjustments		(732	)
Balance as of March 31, 2013	$	4,061

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OTHER LONG-TERM ASSETS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Sep. 30, 2012
OTHER LONG-TERM ASSETS [Abstract]
Auction rate securities	$ 7,966	$ 7,991
Other long-term assets	3,493	2,872
Other long-term investments	1,274	1,082
Total	12,733	11,945
Number of Auction rate securities	2
Number of Auction rate securities, pretax reduction maintained	1
Reduction in fair value Auction Rate Securities, pretax	234
Reduction in fair value Auction Rate Securities, net of tax	151
Monetization of Auction Rate Securities	25
Long-term liability, SERP investments	$ 1,274

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DEBT (Tables)

6 Months Ended

Mar. 31, 2013

DEBT [Abstract]

Schedule of Maturities of Long-term Debt

Principal repayments of the Term Loan are generally made on the last calendar day of each quarter if that day is considered to be a business day.  As of March 31, 2013, scheduled principal repayments of the Term Loan were as follows:

Fiscal Year	Principal Repayments
Remainder of 2013	$	6,563
2014		10,938
2015		15,312
2016		21,875
2017		113,750
Total	$	168,438

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

6 Months Ended

Mar. 31, 2013

ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES [Abstract]

Schedule of accrued expenses, income taxes payable and other current liabilities

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

	March 31,		September 30,
	2013		2012
Accrued compensation	$	14,840	$	18,532
Goods and services received, not yet invoiced		3,251		3,478
Deferred revenue and customer advances		3,627		3,341
Warranty accrual		290		359
Income taxes payable		3,731		2,843
Taxes, other than income taxes		1,393		1,041
Other		2,279		3,144
Total	$	29,411	$	32,738

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ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES [Abstract]
Accrued compensation	$ 14,840	$ 18,532
Goods and services received, not yet invoiced	3,251	3,478
Deferred revenue and customer advances	3,627	3,341
Warranty accrual	290	359
Income taxes payable	3,731	2,843
Taxes, other than income taxes	1,393	1,041
Other	2,279	3,144
Total	$ 29,411	$ 32,738

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DERIVATIVE FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Mar. 31, 2013

DERIVATIVE FINANCIAL INSTRUMENTS [Abstract]

Schedule of Fair Value of Derivative Instruments in the Consolidated Balance Sheet

The fair value of our derivative instrument included in the Consolidated Balance Sheet, which was determined using level 2 inputs, was as follows:

		Asset Derivatives		Liability Derivatives
	Balance Sheet Location	Fair Value at March 31, 2013	Fair Value at September 30, 2012	Fair Value at March 31, 2013	Fair Value at September 30, 2012
Derivatives not designated as hedging instruments
Foreign exchange contracts	Prepaid expenses and other current assets	$   59	$    38	$    -	$    -
	Accrued expenses and other current liabilities	$      -	$      -	$    -	$    -

Schedule of the Effect of Derivative Instruments on the Consolidated Statement of Income

The following table summarizes the effect of our derivative instrument on our Consolidated Statement of Income for the three and six months ended March 31:

		Gain (Loss) Recognized in Statement of Income
		Three Months Ended		Six Months Ended
	Statement of Income Location	March 31, 2013	March 31, 2012	March 31, 2013	March 31, 2012
Derivatives not designated as hedging instruments
Foreign exchange contracts	Other income (expense), net	$82	$468	$323	$468

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COMMITMENTS AND CONTINGENCIES (Tables)

6 Months Ended

Mar. 31, 2013

COMMITMENTS AND CONTINGENCIES [Abstract]

Schedule of product warranty reserve activity

We maintain a warranty reserve that reflects management's best estimate of the cost to replace product that does not meet customers' specifications and performance requirements, and costs related to such replacement.  The warranty reserve is based upon a historical product replacement rate, adjusted for any specific known conditions or circumstances.  Additions and deductions to the warranty reserve are recorded in cost of goods sold.  Our warranty reserve requirements changed during the first six months of fiscal 2013 as follows:

Balance as of September 30, 2012	$	359
Reserve for product warranty during the reporting period		426
Settlement of warranty		(495	)
Balance as of March 31, 2013	$	290

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FAIR VALUE OF FINANCIAL INSTRUMENTS

6 Months Ended

Mar. 31, 2013

FAIR VALUE OF FINANCIAL INSTRUMENTS [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

2. 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 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 March 31, 2013 and September 30, 2012.  See Note 8 for a detailed discussion of our long-term debt.  We have chosen to not measure any of our other financial instruments at fair value as we believe their carrying value approximates their fair value.  We have classified the following assets 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.

March 31, 2013	Level 1		Level 2		Level 3		Total Fair Value
Cash and cash equivalents	$	188,354	$	-	$	-	$	188,354
Auction rate securities (ARS)		-		-		7,966		7,966
Other long-term investments		1,274		-		-		1,274
Total	$	189,628	$	-	$	7,966	$	197,594

September 30, 2012	Level 1		Level 2		Level 3		Total Fair Value
Cash and cash equivalents	$	178,459	$	-	$	-	$	178,459
Auction rate securities (ARS)		-		-		7,991		7,991
Other long-term investments		1,082		-		-		1,082
Total	$	179,541	$	-	$	7,991	$	187,532

Our cash and cash equivalents consist of various bank accounts used to support our operations and investments in institutional money-market funds which are traded in active markets.  The ARS and other long-term investments are included in other long-term assets on our Consolidated Balance Sheet.  The fair value of our long-term ARS is determined through two discounted cash flow analyses, one using a discount rate based on a market index comprised of tax exempt variable rate demand obligations and one using a discount rate based on the LIBOR swap curve, adding a risk factor to reflect current liquidity issues in the ARS market.  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 such time a participant makes a qualifying withdrawal.  The long-term asset was adjusted to $1,274 in the second quarter of fiscal 2013 to reflect its fair value as of March 31, 2013.

We applied accounting standards regarding the classification and valuation of financial instruments to the valuation of our investment in ARS at March 31, 2013.  Our ARS investments at March 31, 2013 consisted of two tax exempt municipal debt securities with a total par value of $8,200.  The ARS market began to experience illiquidity in early 2008, and this illiquidity continues.  Despite this lack of liquidity, there have been no defaults of the underlying securities and interest income on these holdings continues to be received on scheduled interest payment dates.  Our ARS, when purchased, were generally issued by A-rated municipalities.  Although the credit ratings of both municipalities have been downgraded since our original investment, the ARS are credit enhanced and insured with bond insurance and currently carry a credit rating of AA- by Standard and Poors.

Since an active market for ARS does not currently exist, we determine the fair value of these investments using a Level 3 discounted cash flow analysis and also consider other factors such as the reduced liquidity in the ARS market and nature of the insurance backing.  Key inputs to our discounted cash flow model include projected cash flows from interest and principal payments and the weighted probabilities of improved liquidity or debt refinancing by the issuer.  We also incorporate certain Level 2 market indices into the discounted cash flow analysis, including published rates such as the LIBOR rate, the LIBOR swap curve and a municipal swap index published by the Securities Industry and Financial Markets Association.  The following table presents a reconciliation of the activity in fiscal 2013 for fair value measurements using level 3 inputs:

Balance as of October 1, 2012	$	7,991
Net sales of ARS		(25	)
Balance as of March 31, 2013	$	7,966

Based on our fair value assessment, we determined that one ARS continues to be impaired as of March 31, 2013.  This security has a fair value of $3,016 (par value $3,250).  We assessed the impairment in accordance with the applicable standards and determined that the impairment was due to the lack of liquidity in the ARS market rather than to credit risk.  We have maintained the $234 temporary impairment that we previously recorded.  We believe that this ARS is not permanently impaired because in the event of default by the issuer, we expect the insurance provider would pay interest and principal following the original repayment schedule, and we do not intend to sell the security nor do we believe we will be required to sell the security before the value recovers, which may be at maturity.  We determined that the fair value of the other ARS was not impaired as of March 31, 2013.  In November 2011, the municipality that issued our impaired ARS filed for bankruptcy protection.  We considered this development, in light of the continued insurance backing, and have concluded the impairment we have maintained remains adequate and temporary.  See Note 6 for more information on these investments.

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SHARE-BASED COMPENSATION PLANS (Tables)

6 Months Ended

Mar. 31, 2013

SHARE-BASED COMPENSATION PLANS [Abstract]

Share based compensation expense

Share-based compensation expense for the three and six months ended March 31, 2013, and 2012, was as follows:

	Three Months Ended				Six Months Ended
	March 31,				March 31,
	2013		2012		2013		2012
Cost of goods sold	$	403	$	366	$	915	$	747
Research, development and technical		310		255		676		545
Selling and marketing		324		292		710		769
General and administrative		2,772		3,113		5,002		5,358
Total share-based compensation expense		3,809		4,026		7,303		7,419
Tax benefit		1,345		1,300		2,531		2,356
Total share-based compensation expense, net of tax	$	2,464	$	2,726	$	4,772	$	5,063

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ACCOUNTS RECEIVABLE (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2012	Mar. 31, 2013	Sep. 30, 2012
ACCOUNTS RECEIVABLE [Abstract]
Accounts receivable, less allowance for doubtful accounts		$ 51,220	$ 53,506
Increase In Allowance For Doubtful Accounts	3,727
Balance as of September 30, 2012		4,757
Amounts charged to expense		36
Deductions and adjustments		(732)
Balance as of March 31, 2013		$ 4,061

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EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Numerator:
Earnings available to common shares	$ 9,420	$ 5,530	$ 19,123	$ 15,945
Denominator:
Weighted average common shares (Denominator for basic calculation, in shares)	22,974,000	22,768,000	22,914,000	22,624,000
Weighted average effect of dilutive securities:
Share-based compensation (in shares)	897,000	1,012,000	841,000	754,000
Diluted weighted average common shares (Denominator for diluted calculation, in shares)	23,871,000	23,780,000	23,755,000	23,378,000
Earnings per share:
Basic (in dollars per share)	$ 0.41	$ 0.24	$ 0.84	$ 0.70
Diluted (in dollars per share)	$ 0.40	$ 0.23	$ 0.81	$ 0.68
Outstanding stock options excluded from diluted earnings (in shares)	1,500,000	400,000	2,000,000	1,300,000

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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
CONSOLIDATED STATEMENTS OF INCOME [Abstract]
Revenue	$ 100,364	$ 99,236	$ 206,897	$ 201,358
Cost of goods sold	52,019	53,442	108,513	106,285
Gross profit	48,345	45,794	98,384	95,073
Operating expenses:
Research, development and technical	15,073	14,071	30,389	27,826
Selling and marketing	7,046	7,434	14,155	14,770
General and administrative	12,287	15,177	23,241	28,078
Total operating expenses	34,406	36,682	67,785	70,674
Operating income	13,939	9,112	30,599	24,399
Interest expense	872	354	1,825	393
Other income (expense), net	463	97	1,317	201
Income before income taxes	13,530	8,855	30,091	24,207
Provision for income taxes	4,110	3,325	10,968	8,262
Net income	$ 9,420	$ 5,530	$ 19,123	$ 15,945
Basic earnings per share	$ 0.41	$ 0.24	$ 0.84	$ 0.70
Weighted average basic shares outstanding	22,974	22,768	22,914	22,624
Diluted earnings per share	$ 0.40	$ 0.23	$ 0.81	$ 0.68
Weighted average diluted shares outstanding	23,871	23,780	23,755	23,378
Dividends per share	$ 0	$ 15.00	$ 0	$ 15.00

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DEBT (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended			6 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012	Mar. 31, 2013 Revolving Credit Facility [Member]	Feb. 13, 2012 Former Unsecured Revolving Credit Facility [Member]	Mar. 31, 2013 Term Loan [Member]
DEBT [Abstract]
Debt Instrument, Face Amount	$ 175,000
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity				100,000	50,000
Line of Credit Facility, Additional Borrowing Capacity				75,000
Debt Instrument, Maturity Date	Feb. 13, 2017
Line of Credit Facility, Interest Rate Description				In addition to paying interest on outstanding principal under the Credit Agreement, we pay a commitment fee to the lenders under the Revolving Credit Facility in respect of the unutilized commitments thereunder at a rate ranging from 0.25% to 0.35%, based on our consolidated leverage ratio.		Borrowings under the Credit Facilities (other than in respect of swing-line loans) bear interest at a rate per annum equal to the "Applicable Rate" (as defined below) plus, at our option, either (1) a LIBOR rate determined by reference to the cost of funds for deposits in the relevant currency for the interest period relevant to such borrowing or (2) the "Base Rate", which is the highest of (x) the prime rate of Bank of America, N.A., (y) the federal funds rate plus 1/2 of 1.00% and (z) the one-month LIBOR rate plus 1.00%. The initial Applicable Rate for borrowings under the Credit Facilities was 1.75% with respect to LIBOR borrowings and 0.25% with respect to Base Rate borrowings, with such Applicable Rate subject to adjustment based on our consolidated leverage ratio. Swing-line loans will bear interest at the Base Rate plus the Applicable Rate for Base Rate loans under the Revolving Credit Facility.
Line of Credit Facility Unused Capacity Commitment Fee Percentage Minimum				0.25%
Line of Credit Facility Unused Capacity Commitment Fee Percentage Maximum				0.35%
Debt issuance costs		2,658
Debt issuance costs, current	550
Debt issuance costs, noncurrent	1,536
Debt instrument, fair value						168,438
Line of Credit Facility, Covenant Terms	The Credit Agreement contains covenants that restrict the ability of the Company and its subsidiaries to take certain actions, including, among other things and subject to certain significant exceptions: creating liens, incurring indebtedness, making investments, engaging in mergers, selling property, paying dividends or amending organizational documents. The Credit Agreement requires us to comply with certain financial ratio maintenance covenants, including a maximum consolidated leverage ratio of 3.00 to 1.00 through June 30, 2013 and a minimum consolidated fixed charge coverage ratio of 1.25 to 1.00. The maximum consolidated leverage ratio decreases to 2.75 to 1.00 between July 1, 2013 and June 30, 2014 and to 2.50 to 1.00 from July 1, 2014 through the termination of the Credit Agreement. As of March 31, 2013, our consolidated leverage ratio was 1.50 to 1.00 and our consolidated fixed charge coverage ratio was 6.61 to 1.00. The Credit Agreement also contains customary affirmative covenants and events of default. We believe we are in compliance with these covenants.
Long-term Debt, by Maturity [Abstract]
Remainder of 2013	6,563
2014	10,938
2015	15,312
2016	21,875
2017	113,750
Long Term Debt	168,438
Current portion of long-term debt	10,938		10,937
Repayment of long-term debt	$ (4,375)	$ 0

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 19,123	$ 15,945
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,638	11,868
Provision for doubtful accounts	36	3,820
Share-based compensation expense	7,303	7,419
Deferred income tax expense (benefit)	4,061	(1,449)
Non-cash foreign exchange loss	3,653	1,233
Loss on disposal of property, plant and equipment	44	189
Impairment of property, plant and equipment	38	51
Other	(2,279)	(949)
Changes in operating assets and liabilities:
Accounts receivable	(1,952)	(3,297)
Inventories	(3,284)	(1,745)
Prepaid expenses and other assets	(3,485)	2,856
Accounts payable	(3,817)	(4,147)
Accrued expenses, income taxes payable and other liabilities	90	(10,501)
Net cash provided by operating activities	30,169	21,293
Cash flows from investing activities:
Additions to property, plant and equipment	(5,546)	(11,641)
Proceeds from the sale of property, plant and equipment	14	0
Proceeds from the sale of investments	25	50
Net cash used in investing activities	(5,507)	(11,591)
Cash flows from financing activities:
Dividends paid	0	(347,140)
Issuance of long-term debt	0	175,000
Repayment of long-term debt	(4,375)	0
Repurchases of common stock	(21,290)	(14,534)
Net proceeds from issuance of stock	13,159	29,034
Tax benefits associated with share-based compensation expense	707	617
Principal payments under capital lease obligations	(21)	(5)
Net cash used in financing activities	(11,820)	(157,028)
Effect of exchange rate changes on cash	(2,947)	(158)
Increase (decrease) in cash and cash equivalents	9,895	(147,484)
Cash and cash equivalents at beginning of period	178,459	302,546
Cash and cash equivalents at end of period	188,354	155,062
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	1,171	2,385
Issuance of restricted stock	$ 5,926	$ 6,198

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FINANCIAL INFORMATION BY INDUSTRY SEGMENT, GEOGRAPHIC AREA AND PRODUCT LINE (Tables)

6 Months Ended

Mar. 31, 2013

FINANCIAL INFORMATION BY INDUSTRY SEGMENT, GEOGRAPHIC AREA AND PRODUCT LINE [Abstract]

Schedule of revenue by product line

Revenue generated by product line for the three and six months ended March 31, 2013, and 2012, was as follows:

	Three Months Ended				Six Months Ended
	March 31,				March 31,
Revenue:	2013		2012		2013		2012
Tungsten slurries	$	36,819	$	38,218	$	77,525	$	78,946
Dielectric slurries		29,734		27,209		60,092		55,216
Copper slurry, including barrier and aluminum		17,057		16,061		35,041		32,101
Polishing pads		7,402		7,939		15,866		14,869
Data storage slurries		5,424		5,749		10,486		10,726
Engineered Surface Finishes		3,928		4,060		7,887		9,500
Total revenue	$	100,364	$	99,236	$	206,897	$	201,358

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NEW ACCOUNTING PRONOUNCEMENTS

6 Months Ended

Mar. 31, 2013

NEW ACCOUNTING PRONOUNCEMENTS [Abstract]

NEW ACCOUNTING PRONOUNCEMENTS

16. NEW ACCOUNTING PRONOUNCEMENTS

In June 2011, the FASB issued ASU No. 2011-05, "Comprehensive Income (Topic 220) – Presentation of Comprehensive Income" (ASU 2011-05).  The provisions of ASU 2011-05 require an entity to present the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements.  If two separate statements are presented, the statement of other comprehensive income should immediately follow the statement of net income.  ASU 2011-05 became effective for us in the quarter ended December 31, 2012.  The adoption of ASU 2011-05 changed the way we present comprehensive income as we now present comprehensive income in a separate statement immediately following the income statement rather than the prior annual presentation of comprehensive income within the statement of equity and quarterly presentation of comprehensive income within the footnotes to the financial statements.

In February 2013, the FASB issued ASU No. 2013-02, "Comprehensive Income (Topic 220) – Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income" (ASU 2013-02).  The provisions of ASU 2013-02 require an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component.  An entity is also required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified by the respective line items of net income if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period.  For other amounts not required by U.S. GAAP to be reclassified to net income in their entirety, an entity is required to cross reference to other disclosures required under U.S. GAAP.  ASU 2013-02 became effective for us in the quarter ended March 31, 2013.  The adoption of ASU 2013-02 had no impact on our financial statements as we did not have any reclassification adjustments out of accumulated other comprehensive income.

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BACKGROUND AND BASIS OF PRESENTATION (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Dec. 31, 2012	Mar. 31, 2013
BACKGROUND AND BASIS OF PRESENTATION [Abstract]
Foreign income tax adjustment	$ 1,686	$ 1,686
Diluted earnings per share effect of foreign income tax adjustment		$ 0.07

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ACCOUNTS RECEIVABLE (Tables)

6 Months Ended

Mar. 31, 2013

ACCOUNTS RECEIVABLE [Abstract]

Schedule of Allowance for Doubtful Accounts

Accounts receivable, net of allowances for doubtful accounts, was $51,220 as of March 31, 2013 and $53,506 as of September 30, 2012.  The decrease was primarily due to lower revenue generated in the second quarter of fiscal 2013 compared to the fourth quarter of fiscal 2012.  As noted in our Quarterly Report on Form 10-Q for the period ended March 31, 2012, we recorded $3,727 in bad debt expense for Elpida Memory, Inc. (Elpida), a significant customer in Japan that filed for bankruptcy protection in February 2012.  We have maintained a reserve for the entire balance as collection of any or all of this balance remains uncertain.  Elpida has been paying the Company on a current basis for all shipments made subsequent to its bankruptcy filing.  The Elpida receivable is denominated in Japanese yen, so it is subject to foreign exchange fluctuations which are included in the table below under the deductions and adjustments.  Our allowance for doubtful accounts changed during the six months ended March 31, 2013 as follows:

Balance as of September 30, 2012	$	4,757
Amounts charged to expense		36
Deductions and adjustments		(732	)
Balance as of March 31, 2013	$	4,061

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BACKGROUND AND BASIS OF PRESENTATION

6 Months Ended

Mar. 31, 2013

BACKGROUND AND BASIS OF PRESENTATION [Abstract]

BACKGROUND AND BASIS OF PRESENTATION

1. BACKGROUND AND BASIS OF PRESENTATION

Cabot Microelectronics Corporation ("Cabot Microelectronics'', "the Company'', "us'', "we'' or "our'') supplies high-performance polishing slurries and pads used in the manufacture of advanced integrated circuit (IC) devices within the semiconductor industry, in a process called chemical mechanical planarization (CMP).  CMP is a polishing process used by IC device manufacturers to planarize or flatten many of the multiple layers of material that are deposited upon silicon wafers in the production of advanced ICs.  Our products play a critical role in the production of advanced IC devices, thereby enabling our customers to produce smaller, faster and more complex IC devices with fewer defects.  We develop, produce and sell CMP slurries for polishing many of the conducting and insulating materials used in IC devices, and also for polishing the disk substrates and magnetic heads used in hard disk drives.  We also develop, manufacture and sell CMP polishing pads, which are used in conjunction with slurries in the CMP process.  We also pursue other demanding surface modification applications through our Engineered Surface Finishes (ESF) business where we believe we can leverage our expertise in CMP consumables for the semiconductor industry to develop products for demanding polishing applications in other industries. 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, 2012.

The unaudited consolidated financial statements have been prepared by Cabot Microelectronics Corporation pursuant to the rules of the Securities and Exchange Commission (SEC) and accounting principles generally accepted in the United States of America.  In the opinion of management, these unaudited consolidated financial statements include all normal recurring adjustments necessary for the fair presentation of Cabot Microelectronics' financial position as of March 31, 2013, cash flows for the six months ended March 31, 2013 and March 31, 2012, and results of operations for the three and six months ended March 31, 2013 and March 31, 2012.  The results of operations for the three and six months ended March 31, 2013 may not be indicative of results to be expected for future periods, including the fiscal year ending September 30, 2013.  These unaudited consolidated financial statements 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, 2012.

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 March 31, 2013.

Results of Operations

The results of operations for the six months ended March 31, 2013 include a foreign tax adjustment, which was recorded during the first quarter of fiscal 2013, to correct prior period amounts, which we determined to be immaterial to the prior periods to which it relates and is expected to be immaterial to our full fiscal year 2013 results.  This adjustment reduced net income for the first six months of fiscal 2013 by $1,686 and diluted earnings per share by approximately $0.07.  The adjustment relates to the reversal of a deferred tax asset for cumulative net operating losses (NOLs) associated with our facility in South Korea since its opening in fiscal year 2011, as these NOLs are expected to be consumed during periods a tax holiday is in effect.

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income	$ 9,420	$ 5,530	$ 19,123	$ 15,945
Other comprehensive income:
Foreign currency translation adjustment	(7,055)	(1,235)	(11,751)	(372)
Other comprehensive income, net of tax	(7,055)	(1,235)	(11,751)	(372)
Total comprehensive income	$ 2,365	$ 4,295	$ 7,372	$ 15,573

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SHARE-BASED COMPENSATION PLANS

6 Months Ended

Mar. 31, 2013

SHARE-BASED COMPENSATION PLANS [Abstract]

SHARE-BASED COMPENSATION PLANS

11. SHARE-BASED COMPENSATION PLANS

We issue share-based payments under the following programs: our 2012 Omnibus Incentive Plan (OIP) and our Cabot Microelectronics Corporation 2007 Employee Stock Purchase Plan, as Amended and Restated January 1, 2010 (ESPP).  Prior to March 2012, when our stockholders approved our new OIP, we issued share-based payments under our Second Amended and Restated Cabot Microelectronics Corporation 2000 Equity Incentive Plan, as amended and restated September 23, 2008 (EIP); our ESPP, and, pursuant to our EIP, our Directors' Deferred Compensation Plan, as amended September 23, 2008, and our 2001 Executive Officer Deposit Share Program.  For additional information regarding these programs, refer to Note 11 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, 2012.  Other than the ESPP, all share-based payments granted beginning March 6, 2012 are being made from the OIP, and the EIP is no longer available for any awards.

We record share-based compensation expense for all share-based awards, including stock option grants, restricted stock and restricted stock unit awards and employee stock 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 model to estimate the grant date fair value of our stock options and employee stock 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 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 we add a slight premium to this expected term for employees who meet the definition of retirement eligible pursuant to their grants during the contractual term of the grant.  The risk-free rate is derived from the U.S. Treasury yield curve in effect at the time of grant.

Share-based compensation expense for the three and six months ended March 31, 2013, and 2012, was as follows:

	Three Months Ended				Six Months Ended
	March 31,				March 31,
	2013		2012		2013		2012
Cost of goods sold	$	403	$	366	$	915	$	747
Research, development and technical		310		255		676		545
Selling and marketing		324		292		710		769
General and administrative		2,772		3,113		5,002		5,358
Total share-based compensation expense		3,809		4,026		7,303		7,419
Tax benefit		1,345		1,300		2,531		2,356
Total share-based compensation expense, net of tax	$	2,464	$	2,726	$	4,772	$	5,063

Our non-employee directors received annual equity awards in March 2013, pursuant to the OIP.  The award agreements provide for immediate vesting of the award at the time of termination of service for any reason other than by reason of Cause, Death, Disability or a Change in Control, as defined in the OIP, if at such time the non-employee director has completed an equivalent of at least two full terms as a director of the Company, as defined in the Company's bylaws.  Five of the Company's non-employee directors had completed at least two full terms of service as of the date of the March 2013 award.  Consequently, the requisite service period for the award has already been satisfied and we recorded the fair value of $755 of the awards to these five directors to share-based compensation expense in the fiscal quarter ended March 31, 2013 rather than recording that expense over the one-year vesting period stated in the award agreement, as is done for the other three non-employee directors.

For additional information regarding the estimation of fair value, refer to Note 11 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, 2012.

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Document and Entity Information (USD $)	6 Months Ended
	Mar. 31, 2013	Apr. 30, 2013	Mar. 31, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	CABOT MICROELECTRONICS CORP
Entity Central Index Key	0001102934
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 892,790,000
Entity Common Stock, Shares Outstanding		23,271,925
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013

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OTHER INCOME (EXPENSE), NET

6 Months Ended

Mar. 31, 2013

OTHER INCOME (EXPENSE), NET [Abstract]

OTHER INCOME (EXPENSE), NET

12. OTHER INCOME (EXPENSE), NET

Other income, net, consisted of the following:

	Three Months Ended				Six Months Ended
	March 31,				March 31,
	2013		2012		2013		2012
Interest income	$	33	$	28	$	78	$	79
Other income (expense)		430		69		1,239		122
Total other income (expense), net	$	463	$	97	$	1,317	$	201

The increase in other income was primarily due to the impact of foreign currency fluctuations on monetary assets and liabilities denominated in currencies other than the functional currency, primarily related to the weakening of the Japanese yen against the U.S. dollar.  The increase in other income is net of the gains and losses incurred on forward foreign exchange contracts discussed in Note 9 of this Form 10-Q.

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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Current assets:
Cash and cash equivalents	$ 188,354	$ 178,459
Accounts receivable, less allowance for doubtful accounts of $4,061 at March 31, 2013, and $4,757 at September 30, 2012	51,220	53,506
Inventories	66,075	66,472
Prepaid expenses and other current assets	13,546	12,608
Deferred income taxes	6,851	6,843
Total current assets	326,046	317,888
Property, plant and equipment, net	112,632	125,020
Goodwill	43,916	44,620
Other intangible assets, net	11,025	12,473
Deferred income taxes	4,500	5,879
Other long-term assets	12,733	11,945
Total assets	510,852	517,825
Current liabilities:
Accounts payable	13,913	19,542
Current portion of long-term debt	10,938	10,937
Capital lease obligations	0	2
Accrued expenses, income taxes payable and other current liabilities	29,411	32,738
Total current liabilities	54,262	63,219
Long-term debt, net of current portion	157,500	161,875
Deferred income taxes	1,661	2,017
Capital lease obligations, net of current portion	0	19
Other long-term liabilities	7,286	7,104
Total liabilities	220,709	234,234
Stockholders' equity:
Common Stock: Authorized: 200,000,000 shares, $0.001 par value; Issued: 29,590,023 shares at March 31, 2013, and 28,864,527 shares at September 30, 2012	30	29
Capital in excess of par value of common stock	350,251	329,782
Retained earnings	148,564	129,441
Accumulated other comprehensive income	18,715	30,466
Treasury stock at cost, 6,319,094 shares at March 31, 2013, and 5,682,288 shares at September 30, 2012	(227,417)	(206,127)
Total stockholders' equity	290,143	283,591
Total liabilities and stockholders' equity	$ 510,852	$ 517,825

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OTHER LONG-TERM ASSETS

6 Months Ended

Mar. 31, 2013

OTHER LONG-TERM ASSETS [Abstract]

OTHER LONG-TERM ASSETS

6. OTHER LONG-TERM ASSETS

Other long-term assets consisted of the following:

	March 31,		September 30,
	2013		2012
Auction rate securities	$	7,966	$	7,991
Other long-term assets		3,493		2,872
Other long-term investments		1,274		1,082
Total	$	12,733	$	11,945

As discussed in Note 2 of this Form 10-Q, the two ARS that we owned as of March 31, 2013 are classified as long-term investments.  The securities are credit enhanced and insured with bond insurance and all interest payments continue to be received on a timely basis.  Although we believe these securities will ultimately be collected in full, we believe that it is not likely that we will be able to monetize the securities in our next business cycle (which for us is generally one year).  We maintain a $234 pretax reduction ($151 net of tax) in fair value on one of the ARS that we first recognized in fiscal 2008.  We continue to believe this decline in fair value is temporary based on: (1) the nature of the underlying debt; (2) the presence of bond insurance; (3) the fact that all interest payments have been received; (4) our successful monetization of $25 of this security during the quarter ended March 31, 2013; and (5) our intention not to sell the security nor be required to sell the security until the value recovers, which may be at maturity.

As discussed in Note 2 of this Form 10-Q, we recorded a long-term asset and a corresponding long-term liability of $1,274 representing the fair value of our SERP investments as of March 31, 2013.

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GOODWILL AND OTHER INTANGIBLE ASSETS

6 Months Ended

Mar. 31, 2013

GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

5. GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill was $43,916 as of March 31, 2013, and $44,620 as of September 30, 2012.  The decrease in goodwill was due to foreign exchange fluctuations of the New Taiwan dollar.

Goodwill and indefinite-lived intangible assets are tested for impairment annually in the fourth quarter of the 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.  Historically, we consistently determined the fair value of our reporting units using a discounted cash flow analysis ("step one") of our projected future results.  Effective September 30, 2011, we adopted a new accounting pronouncement related to our goodwill impairment analysis, which allowed an entity to first perform a qualitative analysis ("step zero") of the fair value of its reporting units to determine whether it is necessary to perform the historical two-step quantitative goodwill analysis.  We used this new guidance in our annual impairment analysis for goodwill in both fiscal 2012 and 2011, determining that it was more likely than not that the carrying amounts of all reporting units exceeded their respective fair values.  The recoverability of indefinite-lived intangible assets was historically measured using the royalty savings method.  In fiscal 2012, we adopted new accounting pronouncements related to our impairment review of indefinite-lived intangible assets, which allows a qualitative assessment of factors used in the impairment review.  Changes in economic and operating conditions that occur after the annual impairment analysis or an interim impairment analysis that impact these assumptions may result in future impairment charges.

We completed our annual impairment test during our fourth quarter of fiscal 2012 and concluded that no impairment existed.  There were no indicators of potential impairment during the quarter ended March 31, 2013, so it was not necessary to perform an impairment review for goodwill and indefinite-lived intangible assets during the quarter.  There have been no cumulative impairment charges recorded on the goodwill of any of our reporting units.

The components of other intangible assets are as follows:

	March 31, 2013				September 30, 2012
	Gross Carrying		Accumulated		Gross Carrying		Accumulated
	Amount		Amortization		Amount		Amortization
Other intangible assets subject to amortization:
Product technology	$	8,331	$	5,353	$	8,387	$	4,902
Acquired patents and licenses		8,270		6,985		8,270		6,775
Trade secrets and know-how		2,550		2,550		2,550		2,550
Distribution rights, customer lists and other		12,384		6,812		12,586		6,283
Total other intangible assets subject to amortization		31,535		21,700		31,793		20,510
Total other intangible assets not subject to amortization*		1,190				1,190
Total other intangible assets	$	32,725	$	21,700	$	32,983	$	20,510

*Total other intangible assets not subject to amortization consist primarily of trade names.

Amortization expense on our other intangible assets was $658 and $1,319 for the three and six months ended March 31, 2013, respectively.  Amortization expense on our other intangible assets was $675 and $1,344 for the three and six months ended March 31, 2012, respectively.  Estimated future amortization expense for the five succeeding fiscal years is as follows:

Fiscal Year	Estimated Amortization Expense
Remainder of 2013	$	1,303
2014		2,480
2015		2,412
2016		1,996
2017		1,166

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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Mar. 31, 2013

FAIR VALUE OF FINANCIAL INSTRUMENTS [Abstract]

Schedule of 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 March 31, 2013 and September 30, 2012.  See Note 8 for a detailed discussion of our long-term debt.  We have chosen to not measure any of our other financial instruments at fair value as we believe their carrying value approximates their fair value.  We have classified the following assets 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.

March 31, 2013	Level 1		Level 2		Level 3		Total Fair Value
Cash and cash equivalents	$	188,354	$	-	$	-	$	188,354
Auction rate securities (ARS)		-		-		7,966		7,966
Other long-term investments		1,274		-		-		1,274
Total	$	189,628	$	-	$	7,966	$	197,594

September 30, 2012	Level 1		Level 2		Level 3		Total Fair Value
Cash and cash equivalents	$	178,459	$	-	$	-	$	178,459
Auction rate securities (ARS)		-		-		7,991		7,991
Other long-term investments		1,082		-		-		1,082
Total	$	179,541	$	-	$	7,991	$	187,532

Schedule of Auction Rate Securities (ARS) Activity

Since an active market for ARS does not currently exist, we determine the fair value of these investments using a Level 3 discounted cash flow analysis and also consider other factors such as the reduced liquidity in the ARS market and nature of the insurance backing.  Key inputs to our discounted cash flow model include projected cash flows from interest and principal payments and the weighted probabilities of improved liquidity or debt refinancing by the issuer.  We also incorporate certain Level 2 market indices into the discounted cash flow analysis, including published rates such as the LIBOR rate, the LIBOR swap curve and a municipal swap index published by the Securities Industry and Financial Markets Association.  The following table presents a reconciliation of the activity in fiscal 2013 for fair value measurements using level 3 inputs:

Balance as of October 1, 2012	$	7,991
Net sales of ARS		(25	)
Balance as of March 31, 2013	$	7,966

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INCOME TAXES

6 Months Ended

Mar. 31, 2013

INCOME TAXES [Abstract]

INCOME TAXES

13. INCOME TAXES

Our effective income tax rate was 30.4% and 36.4% for the three and six months ended March 31, 2013 compared to a 37.5% and 34.1% effective income tax rate for the three and six months ended March 31, 2012.  The increase in the effective tax rate during the first six months of fiscal 2013 was primarily due to the recognition of a $1,686 foreign tax adjustment during the quarter ended December 31, 2012, as discussed in Note 1 under the heading "Results of Operations", and the recognition of a $1,015 valuation allowance on a deferred tax asset during the quarter ended March 31, 2013, related to a former equity investment in an entity that was legally dissolved during the quarter.  The former equity investment, which had been fully impaired in fiscal 2007 for financial book purposes, represents a capital asset for tax purposes.  Management has determined that it is not likely that capital gains will be generated within the relevant timeframe to offset the capital loss of this investment.  Consequently, a valuation allowance has been established to reduce the deferred tax asset to zero.  The resulting increase in our effective tax rate was partially offset by effects of the reinstatement of the U.S. research and experimentation tax credit, retroactively effective January 1, 2012, as the American Taxpayer Relief Act of 2012 was signed into law on January 2, 2013.  During the quarter ended March 31, 2013, we recorded a $947 discrete tax credit related to qualified research and development spending in fiscal 2012 and we currently estimate we will receive an additional $1,100 in tax benefits for full fiscal year 2013, subject to actual qualified research and development spending as defined by the law.

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DERIVATIVE FINANCIAL INSTRUMENTS

6 Months Ended

Mar. 31, 2013

DERIVATIVE FINANCIAL INSTRUMENTS [Abstract]

DERIVATIVE FINANCIAL INSTRUMENTS

9. DERIVATIVE FINANCIAL INSTRUMENTS

Periodically 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.  Our 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 or expense in the accompanying consolidated income statements in the period in which the exchange rates change.  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 balance sheet at fair value.  At March 31, 2013, we had one forward foreign exchange contract to sell Japanese yen related to intercompany notes with one of our subsidiaries in Japan and for the purpose of hedging the risk associated with a net transactional exposure in Japanese yen.

The fair value of our derivative instrument included in the Consolidated Balance Sheet, which was determined using level 2 inputs, was as follows:

		Asset Derivatives		Liability Derivatives
	Balance Sheet Location	Fair Value at March 31, 2013	Fair Value at September 30, 2012	Fair Value at March 31, 2013	Fair Value at September 30, 2012
Derivatives not designated as hedging instruments
Foreign exchange contracts	Prepaid expenses and other current assets	$   59	$    38	$    -	$    -
	Accrued expenses and other current liabilities	$      -	$      -	$    -	$    -

The following table summarizes the effect of our derivative instrument on our Consolidated Statement of Income for the three and six months ended March 31:

		Gain (Loss) Recognized in Statement of Income
		Three Months Ended		Six Months Ended
	Statement of Income Location	March 31, 2013	March 31, 2012	March 31, 2013	March 31, 2012
Derivatives not designated as hedging instruments
Foreign exchange contracts	Other income (expense), net	$82	$468	$323	$468

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ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES

6 Months Ended

Mar. 31, 2013

ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES [Abstract]

ACCRUED EXPENSES, INCOME TAXES PAYABLE AND OTHER CURRENT LIABILITIES

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

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

	March 31,		September 30,
	2013		2012
Accrued compensation	$	14,840	$	18,532
Goods and services received, not yet invoiced		3,251		3,478
Deferred revenue and customer advances		3,627		3,341
Warranty accrual		290		359
Income taxes payable		3,731		2,843
Taxes, other than income taxes		1,393		1,041
Other		2,279		3,144
Total	$	29,411	$	32,738

The decrease in accrued compensation was primarily due to the payment of our annual incentive bonus program earned in fiscal 2012, partially offset by two quarters of accrual under our annual incentive bonus program related to fiscal 2013.

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DEBT

6 Months Ended

Mar. 31, 2013

DEBT [Abstract]

DEBT

8. DEBT

On February 13, 2012, we entered into a credit agreement (the "Credit Agreement") among the Company, as Borrower, Bank of America, N.A., as administrative agent, swing line lender and an L/C issuer, Bank of America Merrill Lynch and J.P. Morgan Securities LLC, as joint lead arrangers and joint book managers, JPMorgan Chase Bank, N.A., as syndication agent, and Wells Fargo Bank, N.A. as documentation agent.  The Credit Agreement provided us with a $175,000 term loan (the "Term Loan"), which we drew on February 27, 2012 to fund approximately half of the special cash dividend we paid to our stockholders on March 1, 2012, and a $100,000 revolving credit facility (the "Revolving Credit Facility"), which remains undrawn, with sub-limits for multicurrency borrowings, letters of credit and swing-line loans.  The Term Loan and the Revolving Credit Facility are referred to as the "Credit Facilities."  The Credit Agreement provides for an uncommitted accordion feature that allows us to request the existing lenders or, if necessary, third-party financial institutions to provide additional capacity in the Revolving Credit Facility, in an amount not to exceed $75,000.  The Term Loan has periodic scheduled principal repayments; however, we may prepay the loan without penalty.  The Credit Facilities are scheduled to expire on February 13, 2017.  In connection with the Credit Agreement, the Company simultaneously terminated its previously existing $50,000 unsecured revolving credit facility, which had no outstanding balance at the time of termination.

Borrowings under the Credit Facilities (other than in respect of swing-line loans) bear interest at a rate per annum equal to the "Applicable Rate" (as defined below) plus, at our option, either (1) a LIBOR rate determined by reference to the cost of funds for deposits in the relevant currency for the interest period relevant to such borrowing or (2) the "Base Rate", which is the highest of (x) the prime rate of Bank of America, N.A., (y) the federal funds rate plus 1/2 of 1.00% and (z) the one-month LIBOR rate plus 1.00%.  The initial Applicable Rate for borrowings under the Credit Facilities was 1.75% with respect to LIBOR borrowings and 0.25% with respect to Base Rate borrowings, with such Applicable Rate subject to adjustment based on our consolidated leverage ratio.  Swing-line loans will bear interest at the Base Rate plus the Applicable Rate for Base Rate loans under the Revolving Credit Facility.  In addition to paying interest on outstanding principal under the Credit Agreement, we pay a commitment fee to the lenders under the Revolving Credit Facility in respect of the unutilized commitments thereunder at a rate ranging from 0.25% to 0.35%, based on our consolidated leverage ratio.  Interest expense and commitment fees are paid according to the relevant interest period and no less frequently than at the end of each calendar quarter.  We paid $2,658 in customary arrangement fees, upfront fees and administration fees, of which $550 and $1,536 remains in prepaid expenses and other current assets and other long-term assets, respectively, on our Consolidated Balance Sheet as of March 31, 2013.  We must also pay letter of credit fees as necessary.  We may voluntarily prepay the Credit Facilities without premium or penalty, subject to customary "breakage" fees and reemployment costs in the case of LIBOR borrowings.  All obligations under the Credit Agreement are guaranteed by each of our existing and future direct and indirect domestic subsidiaries (the "Guarantors").  The obligations under the Credit Agreement and guarantees of those obligations are secured, subject to certain exceptions, by first priority liens and security interests in the assets of the Company and its domestic subsidiaries.

The Credit Agreement contains covenants that restrict the ability of the Company and its subsidiaries to take certain actions, including, among other things and subject to certain significant exceptions: creating liens, incurring indebtedness, making investments, engaging in mergers, selling property, paying dividends or amending organizational documents.  The Credit Agreement requires us to comply with certain financial ratio maintenance covenants, including a maximum consolidated leverage ratio of 3.00 to 1.00 through June 30, 2013 and a minimum consolidated fixed charge coverage ratio of 1.25 to 1.00.  The maximum consolidated leverage ratio decreases to 2.75 to 1.00 between July 1, 2013 and June 30, 2014 and to 2.50 to 1.00 from July 1, 2014 through the termination of the Credit Agreement.As of March 31, 2013, our consolidated leverage ratio was 1.50 to 1.00 and our consolidated fixed charge coverage ratio was 6.61 to 1.00.  The Credit Agreement also contains customary affirmative covenants and events of default.  We believe we are in compliance with these covenants.

At March 31, 2013, the fair value of the Term Loan approximates its carrying value of $168,438 as the loan bears a floating market rate of interest.  As of March 31, 2013, $10,938 of the debt outstanding is classified as short-term.

Principal repayments of the Term Loan are generally made on the last calendar day of each quarter if that day is considered to be a business day.  As of March 31, 2013, scheduled principal repayments of the Term Loan were as follows:

Fiscal Year	Principal Repayments
Remainder of 2013	$	6,563
2014		10,938
2015		15,312
2016		21,875
2017		113,750
Total	$	168,438

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COMMITMENTS AND CONTINGENCIES

6 Months Ended

Mar. 31, 2013

COMMITMENTS AND CONTINGENCIES [Abstract]

COMMITMENTS AND CONTINGENCIES

10. CONTINGENCIES

LEGAL PROCEEDINGS

While we are not involved in any legal proceedings that we believe will have a material impact on our consolidated financial position, results of operations or cash flows, we periodically become a party to legal proceedings in the ordinary course of business.  For example, in 2011, we concluded litigation in the United States against a competitor in which the validity of certain of our CMP slurry patents for tungsten CMP was upheld, although the specific competitive products at issue were found to not infringe the claims at issue.

Refer to Note 16 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, 2012, for additional information regarding commitments and contingencies.

PRODUCT WARRANTIES

We maintain a warranty reserve that reflects management's best estimate of the cost to replace product that does not meet customers' specifications and performance requirements, and costs related to such replacement.  The warranty reserve is based upon a historical product replacement rate, adjusted for any specific known conditions or circumstances.  Additions and deductions to the warranty reserve are recorded in cost of goods sold.  Our warranty reserve requirements changed during the first six months of fiscal 2013 as follows:

Balance as of September 30, 2012	$	359
Reserve for product warranty during the reporting period		426
Settlement of warranty		(495	)
Balance as of March 31, 2013	$	290

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EARNINGS PER SHARE (Tables)

6 Months Ended

Mar. 31, 2013

EARNINGS PER SHARE [Abstract]

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				Six Months Ended
	March 31,				March 31,
	2013		2012		2013		2012
Numerator:
Earnings available to common shares	$	9,420	$	5,530	$	19,123	$	15,945
Denominator:
Weighted average common shares		22,973,631		22,768,425		22,914,133		22,623,978
(Denominator for basic calculation)
Weighted average effect of dilutive securities:
Share-based compensation		897,394		1,011,108		840,539		753,824
Diluted weighted average common shares		23,871,025		23,779,533		23,754,672		23,377,802
(Denominator for diluted calculation)
Earnings per share:
Basic	$	0.41	$	0.24	$	0.84	$	0.70
Diluted	$	0.40	$	0.23	$	0.81	$	0.68

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OTHER INCOME (EXPENSE), NET (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Other Income (Expense) Net [Line Items]
Total other income (expense), net	$ 463	$ 97	$ 1,317	$ 201
Interest Income [Member]
Other Income (Expense) Net [Line Items]
Total other income (expense), net	33	28	78	79
Other Income (Expense) Net [Member]
Other Income (Expense) Net [Line Items]
Total other income (expense), net	$ 430	$ 69	$ 1,239	$ 122

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FINANCIAL INFORMATION BY INDUSTRY SEGMENT, GEOGRAPHIC AREA AND PRODUCT LINE

6 Months Ended

Mar. 31, 2013

FINANCIAL INFORMATION BY INDUSTRY SEGMENT, GEOGRAPHIC AREA AND PRODUCT LINE [Abstract]

FINANCIAL INFORMATION BY INDUSTRY SEGMENT, GEOGRAPHIC AREA AND PRODUCT LINE

15. FINANCIAL INFORMATION BY INDUSTRY SEGMENT AND PRODUCT LINE

We operate predominantly in one industry segment – the development, manufacture, and sale of CMP consumables.

Revenue generated by product line for the three and six months ended March 31, 2013, and 2012, was as follows:

	Three Months Ended				Six Months Ended
	March 31,				March 31,
Revenue:	2013		2012		2013		2012
Tungsten slurries	$	36,819	$	38,218	$	77,525	$	78,946
Dielectric slurries		29,734		27,209		60,092		55,216
Copper slurry, including barrier and aluminum		17,057		16,061		35,041		32,101
Polishing pads		7,402		7,939		15,866		14,869
Data storage slurries		5,424		5,749		10,486		10,726
Engineered Surface Finishes		3,928		4,060		7,887		9,500
Total revenue	$	100,364	$	99,236	$	206,897	$	201,358

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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

6 Months Ended

Mar. 31, 2013

GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]

Components of other intangible assets

The components of other intangible assets are as follows:

	March 31, 2013				September 30, 2012
	Gross Carrying		Accumulated		Gross Carrying		Accumulated
	Amount		Amortization		Amount		Amortization
Other intangible assets subject to amortization:
Product technology	$	8,331	$	5,353	$	8,387	$	4,902
Acquired patents and licenses		8,270		6,985		8,270		6,775
Trade secrets and know-how		2,550		2,550		2,550		2,550
Distribution rights, customer lists and other		12,384		6,812		12,586		6,283
Total other intangible assets subject to amortization		31,535		21,700		31,793		20,510
Total other intangible assets not subject to amortization*		1,190				1,190
Total other intangible assets	$	32,725	$	21,700	$	32,983	$	20,510

*Total other intangible assets not subject to amortization consist primarily of trade names.

Estimated future amortization expense for the succeeding five fiscal years

Amortization expense on our other intangible assets was $658 and $1,319 for the three and six months ended March 31, 2013, respectively.  Amortization expense on our other intangible assets was $675 and $1,344 for the three and six months ended March 31, 2012, respectively.  Estimated future amortization expense for the five succeeding fiscal years is as follows:

Fiscal Year	Estimated Amortization Expense
Remainder of 2013	$	1,303
2014		2,480
2015		2,412
2016		1,996
2017		1,166

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COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2013
Movement in standard product warranty accrual [Roll Forward]
Balance as of September 30, 2012	$ 359
Reserve for product warranty during the reporting period	426
Settlement of warranty	(495)
Balance as of March 31, 2013	$ 290

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INVENTORIES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
INVENTORIES [Abstract]
Raw materials	$ 32,675	$ 34,591
Work in process	7,358	6,333
Finished goods	26,042	25,548
Total	$ 66,075	$ 66,472

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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Current assets
Allowance for doubtful accounts	$ 4,061	$ 4,757
Stockholders' equity
Common stock: Authorized	200,000,000	200,000,000
Common stock: par value	$ 0.001	$ 0.001
Common stock: Issued	29,590,023	28,864,527
Treasury stock at cost, shares	6,319,094	5,682,288

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INVENTORIES

6 Months Ended

Mar. 31, 2013

INVENTORIES [Abstract]

INVENTORIES

4. INVENTORIES

Inventories consisted of the following:

	March 31,		September 30,
	2013		2012
Raw materials	$	32,675	$	34,591
Work in process		7,358		6,333
Finished goods		26,042		25,548
Total	$	66,075	$	66,472

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OTHER LONG-TERM ASSETS (Tables)

6 Months Ended

Mar. 31, 2013

OTHER LONG-TERM ASSETS [Abstract]

Schedule of other long term assets

Other long-term assets consisted of the following:

	March 31,		September 30,
	2013		2012
Auction rate securities	$	7,966	$	7,991
Other long-term assets		3,493		2,872
Other long-term investments		1,274		1,082
Total	$	12,733	$	11,945

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FAIR VALUE OF FINANCIAL INSTRUMENTS, Schedule of Fair Value of Financial Instruments (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 188,354	$ 178,459
Auction rate securities (ARS)	7,966	7,991
Other long-term investments	1,274	1,082
Total	197,594	187,532
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	188,354	178,459
Auction rate securities (ARS)	0	0
Other long-term investments	1,274	1,082
Total	189,628	179,541
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Auction rate securities (ARS)	0	0
Other long-term investments	0	0
Total	0	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Auction rate securities (ARS)	7,966	7,991
Other long-term investments	0	0
Total	$ 7,966	$ 7,991

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EARNINGS PER SHARE

6 Months Ended

Mar. 31, 2013

EARNINGS PER SHARE [Abstract]

EARNINGS PER SHARE

14. 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				Six Months Ended
	March 31,				March 31,
	2013		2012		2013		2012
Numerator:
Earnings available to common shares	$	9,420	$	5,530	$	19,123	$	15,945
Denominator:
Weighted average common shares		22,973,631		22,768,425		22,914,133		22,623,978
(Denominator for basic calculation)
Weighted average effect of dilutive securities:
Share-based compensation		897,394		1,011,108		840,539		753,824
Diluted weighted average common shares		23,871,025		23,779,533		23,754,672		23,377,802
(Denominator for diluted calculation)
Earnings per share:
Basic	$	0.41	$	0.24	$	0.84	$	0.70
Diluted	$	0.40	$	0.23	$	0.81	$	0.68

For the three months ended March 31, 2013 and 2012, approximately 1.5 million and 0.4 million shares, respectively, attributable to outstanding stock options were excluded from the calculation of diluted earnings per share because the exercise price of the options was greater than the average market price of our common stock and, therefore, their inclusion would have been anti-dilutive.

For the six months ended March 31, 2013 and 2012, approximately 2.0 million and 1.3 million shares, respectively, attributable to outstanding stock options were excluded from the calculation of diluted earnings per share because the exercise price of the options was greater than the average market price of our common stock and, therefore, their inclusion would have been anti-dilutive.