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 December 28, 2018

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 001-37793

 _________________________________________

Atkore International Group Inc.

(Exact name of registrant as specified in its charter)

_________________________________________

Delaware	90-0631463
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification No.)

16100 South Lathrop Avenue, Harvey, Illinois 60426

(Address of principal executive offices) (Zip Code)

708-339-1610

(Registrant's telephone number, including area code)

_________________________________________

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  o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  x    No  o

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

Large accelerated filer	x	Accelerated filer	o
Non-accelerated filer	o	Smaller reporting company	o
		Emerging growth company	o
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  o    No  x

As of January 30, 2019, there were 45,980,471 shares of the registrant's common stock, $0.01 par value per share, outstanding.

Table of Contents

	Page No.
PART I. FINANCIAL INFORMATION
Item 1. Financial Statements (Unaudited)	2
Condensed Consolidated Statements of Operations	2
Condensed Consolidated Statements of Comprehensive Income	3
Condensed Consolidated Balance Sheets	4
Condensed Consolidated Statements of Cash Flows	5
Condensed Consolidated Statement of Changes in Shareholders' Equity	6
Notes to Condensed Consolidated Financial Statements	7
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations	21
Item 3. Quantitative and Qualitative Disclosures about Market Risk	29
Item 4. Controls and Procedures	29
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	31
Item 3. Defaults Upon Senior Securities	31
Item 4. Mine Safety Disclosures	31
Item 5. Other Information	31
Item 6. Exhibits	32
Signatures	33

1

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

ATKORE INTERNATIONAL GROUP INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

		Three months ended
(in thousands, except per share data)	Note	December 28, 2018			December 29, 2017
Net sales		$	452,028		$	414,558
Cost of sales		341,772			317,691
Gross profit		110,256			96,867
Selling, general and administrative		56,379			51,595
Intangible asset amortization	12	8,214			8,687
Operating income		45,663			36,585
Interest expense, net		12,160			6,594
Other (income) expense, net	6	(1,600		)	286
Income before income taxes		35,103			29,705
Income tax expense	7	8,154			2,516
Net income		$	26,949		$	27,189
Net income per share
Basic	8	$	0.56		$	0.43
Diluted	8	$	0.54		$	0.41

See Notes to unaudited condensed consolidated financial statements.

2

ATKORE INTERNATIONAL GROUP INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

		Three months ended
(in thousands)	Note	December 28, 2018			December 29, 2017
Net income		$	26,949		$	27,189
Other comprehensive income, net of tax:
Change in foreign currency translation adjustment		(2,746		)	331
Change in unrecognized loss related to pension benefit plans	4	25			65
Total other comprehensive (loss) income	9	(2,721		)	396
Comprehensive income		$	24,228		$	27,585

See Notes to unaudited condensed consolidated financial statements.

3

ATKORE INTERNATIONAL GROUP INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

(in thousands, except share and per share data)	Note	December 28, 2018			September 30, 2018
Assets
Current Assets:
Cash and cash equivalents		$	75,919		$	126,662
Accounts receivable, less allowance for doubtful accounts of $2,534 and $1,762, respectively		294,181			265,147
Inventories, net	10	226,587			221,753
Prepaid expenses and other current assets		28,952			33,576
Total current assets		625,639			647,138
Property, plant and equipment, net	11	241,699			213,108
Intangible assets, net	12	295,203			291,916
Goodwill	12	178,797			170,129
Deferred tax assets	7	1,249			162
Other long-term assets		2,197			1,607
Total Assets		$	1,344,784		$	1,324,060
Liabilities and Equity
Current Liabilities:
Short-term debt and current maturities of long-term debt	13	$	26,561		$	26,561
Accounts payable		134,090			156,525
Income tax payable		3,931			542
Accrued compensation and employee benefits		21,197			33,350
Customer liabilities		50,127			3,377
Other current liabilities		51,642			52,392
Total current liabilities		287,548			272,747
Long-term debt	13	878,094			877,686
Deferred tax liabilities	7	23,720			16,510
Other long-term tax liabilities		907			1,443
Pension liabilities		16,500			17,075
Other long-term liabilities		13,860			16,540
Total Liabilities		1,220,629			1,202,001
Equity:
Common stock, $0.01 par value, 1,000,000,000 shares authorized, 45,980,471 and 47,079,645 shares issued and outstanding, respectively		461			472
Treasury stock, held at cost, 260,900 and 260,900 shares, respectively		(2,580		)	(2,580		)
Additional paid-in capital		460,264			457,978
Accumulated deficit		(314,831		)	(317,373		)
Accumulated other comprehensive loss	9	(19,159		)	(16,438		)
Total Equity		124,155			122,059
Total Liabilities and Equity		$	1,344,784		$	1,324,060

See Notes to unaudited condensed consolidated financial statements.

4

ATKORE INTERNATIONAL GROUP INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

		Three months ended
(in thousands)	Note	December 28, 2018			December 29, 2017
Operating activities:
Net income		$	26,949		$	27,189
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		18,021			17,210
Deferred income taxes	7	(1,306		)	(5,334		)
Stock-based compensation		2,982			3,564
Other adjustments to net income		2,201			1,559
Changes in operating assets and liabilities, net of effects from acquisitions
Accounts receivable		22,111			19,967
Inventories		4,263			(5,396		)
Accounts payable		(30,405		)	(8,311		)
Other, net		(4,539		)	(1,508		)
Net cash provided by operating activities		40,277			48,940
Investing activities:
Capital expenditures		(6,875		)	(8,235		)
Acquisition of businesses, net of cash acquired	3	(57,899		)	—
Other, net		(151		)	784
Net cash used in investing activities		(64,925		)	(7,451		)
Financing activities:
Borrowings under credit facility	13	—			204,000
Repayments under credit facility	13	—			(247,000		)
Repayments of short-term debt	13	—			(1,250		)
Issuance of common stock		(695		)	3,314
Repurchase of common stock		(24,419		)	(6,681		)
Other, net		(62		)	(48		)
Net cash used for financing activities		(25,176		)	(47,665		)
Effects of foreign exchange rate changes on cash and cash equivalents		(919		)	219
Decrease in cash and cash equivalents		(50,743		)	(5,957		)
Cash and cash equivalents at beginning of period		126,662			45,718
Cash and cash equivalents at end of period		$	75,919		$	39,761
Supplementary Cash Flow information
Capital expenditures, not yet paid		$	1,106		$	615

See Notes to unaudited condensed consolidated financial statements.

5

ATKORE INTERNATIONAL GROUP INC.

CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY

(Unaudited)

	Common Stock					Treasury Stock			Additional Paid-in Capital			Accumulated Deficit			Accumulated Other Comprehensive Income (Loss)			Total Equity
(in thousands)	Shares		Amount			Amount
Balance as of September 30, 2016	62,458		$	626		$	(2,580	)	$	398,292		$	(113,142	)	$	(25,950	)	$	257,246
Net income	—		—			—			—			84,639			—			84,639
Other comprehensive loss	—		—			—			—			—			7,968			7,968
Stock-based compensation	—		—			—			12,788			—			—			12,788
Issuance of common stock	1,628		16			—			12,152			—			—			12,168
Repurchase of common stock	(781	)	(8		)	—			—			(13,930		)	—			(13,938		)
Balance as of September 30, 2017	63,305		634			(2,580		)	423,232			(42,433		)	(17,982		)	360,871
Net income	—		—			—			—			136,645			—			136,645
Other comprehensive loss	—		—			—			—			—			1,544			1,544
Stock-based compensation	—		—			—			14,664			—			—			14,664
Issuance of common stock	2,795		28			—			20,082			—			—			20,110
Repurchase of common stock	(19,020	)	(190		)	—			—			(411,585		)	—			(411,775		)
Balance as of September 30, 2018	47,080		472			(2,580		)	457,978			(317,373		)	(16,438		)	122,059
Net income	—		—			—			—			26,949			—			26,949
Other comprehensive income	—		—			—			—			—			(2,721		)	(2,721		)
Stock-based compensation	—		—			—			2,982			—			—			2,982
Issuance of common stock	131		1			—			(696		)	—			—			(695		)
Repurchase of common stock	(1,230	)	(12		)	—			—			(24,407		)	—			(24,419		)
Balance as of December 28, 2018	45,981		$	461		$	(2,580	)	$	460,264		$	(314,831	)	$	(19,159	)	$	124,155

See Notes to unaudited condensed consolidated financial statements.

6

ATKORE INTERNATIONAL GROUP INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

(dollars and shares in thousands, except per share data)

1. BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

Organization and Ownership Structure — Atkore International Group Inc. (the "Company", "Atkore" or "AIG") is a leading manufacturer of Electrical Raceway products primarily for the non-residential construction and renovation markets and Mechanical Products & Solutions ("MP&S") for the construction and industrial markets. Electrical Raceway products form the critical infrastructure that enables the deployment, isolation and protection of a structure's electrical circuitry from the original power source to the final outlet. MP&S frame, support and secure component parts in a broad range of structures, equipment and systems in electrical, industrial and construction applications.

Atkore was incorporated in the State of Delaware on November 4, 2010. Atkore is the sole stockholder of Atkore International Holdings Inc. ("AIH"), which in turn is the sole stockholder of Atkore International, Inc. ("AII").

Basis of Presentation — The accompanying unaudited condensed consolidated financial statements of the Company included herein have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). These unaudited condensed consolidated financial statements have been prepared in accordance with the Company's accounting policies and on the same basis as those financial statements included in the Company's latest Annual Report on Form 10-K for the year ended September 30, 2018 filed with the U.S. Securities and Exchange Commission (the "SEC") on November 28, 2018, and should be read in conjunction with those consolidated financial statements and the notes thereto. Certain information and disclosures normally included in the Company's annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC.

The unaudited condensed consolidated financial statements include the assets and liabilities used in operating the Company's business. All intercompany balances and transactions have been eliminated in consolidation. The results of companies acquired or disposed of are included in the unaudited condensed consolidated financial statements from the effective date of acquisition or up to the date of disposal.

These statements include all adjustments (consisting of normal recurring adjustments) that the Company considered necessary to present a fair statement of its results of operations, financial position and cash flows. The results reported in these unaudited condensed consolidated financial statements should not be regarded as necessarily indicative of results that may be expected for the entire year.

Fiscal Periods — The Company has a fiscal year that ends on September 30. It is the Company's practice to establish quarterly closings using a 4-5-4 calendar. The Company's fiscal quarters end on the last Friday in December, March and June.

Use of Estimates — The preparation of the condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclose contingent assets and liabilities at the date of the condensed consolidated financial statements and report the associated amounts of revenues and expenses. Actual results could differ materially from these estimates.

Summary of Significant Accounting Policies

Fair Value Measurements — Authoritative guidance for fair value measurements establishes a three-level hierarchy that ranks the quality and reliability of information used in developing fair value estimates. The hierarchy gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data. In cases where two or more levels of inputs are used to determine fair value, a financial instrument’s level is determined based on the lowest level input that is considered significant to the fair value measurement in its entirety. The three levels of the fair value hierarchy are summarized as follows:

Level 1—inputs are based upon quoted prices (unadjusted) in active markets for identical assets or liabilities that are accessible as of the measurement date.

7

Level 2—inputs are based upon quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, and model-derived valuations for the asset or liability that are derived principally from or corroborated by market data for which the primary inputs are observable, including forward interest rates, yield curves, credit risk and exchange rates.

Level 3—inputs for the valuations are unobservable and are based on management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques such as option pricing models and discounted cash flow models.

See Note 14, ''Fair Value Measurements'' for further detail.

Recent Accounting Pronouncements

A summary of recently adopted accounting guidance are as follows. Adoption dates are on the first day of the fiscal year indicated below, unless otherwise specified.

ASU	Description of ASU	Impact to Atkore	Note	Adoption Date
2014-09 Revenue from Contracts with Customers	The Accounting Standards Update ("ASU") provides guidance for revenue recognition. The update's core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under current guidance. Examples of the use of judgments and estimates may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. The update also requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The update provides for two transition methods to the new guidance: a full retrospective approach and a modified retrospective approach.	The Company adopted the guidance in the first quarter of 2019 using the modified retrospective method. See Note 2, "Revenue from Contracts with Customers for further detail."	2	2019

8

A summary of accounting guidance not yet adopted is as follows. Effective dates are on the first day of the fiscal year indicated below, unless otherwise specified.

ASU	Description of ASU	Impact to Atkore	Effective Date
2018-13 Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement	The ASU amends Accounting Standard Codification ("ASC") 820 to add, remove and clarify disclosure requirements related to fair value measurements.	Under evaluation.	2020
2018-07 Improvements to Nonemployee Share-Based Payment Accounting.	ASU 2018-07 simplifies the accounting for share-based payments to nonemployees by aligning it with the accounting for share-based payments to employees, with certain exceptions.	Under evaluation.	2020
ASU 2018-02 Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	The ASU provided entities with the option to reclassify tax effects stranded in accumulated other comprehensive income as a result of the "H.R.1", also known as the "Tax Cuts and Jobs Act" ("TCJA") to retained earnings.	Under evaluation.	2020
2016-02 Leases (Topic 842)	The ASU requires companies to use a "right of use" lease model that assumes that each lease creates an asset (the lessee's right to use the leased asset) and a liability (the future rent payment obligations), which should be reflected on a lessee's balance sheet to fairly represent the lease transaction and the lessee's related financial obligations with terms of more than 12 months.	The Company will adopt the new lease guidance in the first quarter of fiscal 2020. The Company has established an implementation team, deployed lease landscape surveys and is currently evaluating the impact of adoption of this ASU on its consolidated financial statements.	2020
2018-14 Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans	The ASU amends ASC 715 to add, remove and clarify disclosure requirements related to defined benefit pension and other postretirement plans.	Under evaluation.	2021

2. REVENUE FROM CONTRACTS WITH CUSTOMERS

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, and issued subsequent amendments to the initial guidance in August 2015, March 2016, April 2016, May 2016, and December 2016 within ASU 2015-14, ASU 2016-08, ASU 2016-10 and ASU 2016-20, respectively. The core principle of this new revenue recognition guidance is that a company will recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. The new guidance defines a five-step process to implement this core principle. The new guidance also requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The new guidance provides for two transition methods, a full retrospective approach and a modified retrospective approach. The Company adopted the new guidance on October 1, 2018 utilizing the modified retrospective method of adoption for contracts not completed at the adoption date and determined there were no changes required to its reported revenues and earnings as a result of the adoption. The impacts to the financial statements consist of balance sheet reclassifications including amounts associated with the changes in the classification of reserves related to volume rebates and returns reserves. The Company has also enhanced its disclosures of revenue to comply with the new guidance. The impact to the Company’s financial statements as of December 28, 2018 was as follows:

9

	As of December 28, 2018
Balance Sheet	As Reported	Balances before adoption of ASC 606	Effect of Adoption Higher/(Lower)
Accounts Receivable, net	294,181	247,989	46,192
Customer liabilities	50,127	3,935	46,192

The Company’s revenue arrangements primarily consist of a single performance obligation to transfer promised goods which is satisfied at a point in time when title, risks and rewards of ownership, and subsequently control have transferred to the customer. This generally occurs when the product is shipped to the customer, with an immaterial amount of transactions in which control transfers upon delivery. The Company primarily offers assurance-type standard warranties that do not represent separate performance obligations.

The Company has certain arrangements that require it to estimate at the time of sale the amounts of variable consideration that should not be recorded as revenue as certain amounts are not expected to be collected from customers, as well as an estimate of the value of products to be returned. The Company principally relies on historical experience, specific customer agreements, and anticipated future trends to estimate these amounts at the time of sale and to reduce the transaction price. These arrangements include sales discounts and allowances, volume rebates, and returned goods.

As part of the adoption of the new revenue standard, the Company has elected to utilize certain practical expedients. The Company records amounts billed to customers for reimbursement of shipping and handling costs within revenue. Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as fulfillment costs and are included in cost of goods sold. Sales taxes and other usage-based taxes are excluded from revenue. The practical expedient not to disclose information about remaining performance obligations has also been elected as these obligations have an original duration of one year or less. The Company does not evaluate whether the selling price includes a financing interest component for contracts that are less than a year. The Company also expenses costs incurred to obtain a contract, primarily sales commissions, as all obligations will be settled in less than one year.

The Company typically receives payment 30 to 60 days from the point it has satisfied the related performance obligation. See Note 17, ''Segment Information'' for revenue disaggregated by geography and product categories.

3. ACQUISITIONS

From time to time, the Company enters into strategic acquisitions in an effort to better service existing customers and to attain new customers.

On October 1, 2018, the Company acquired all of the outstanding stock of Vergokan International NV ("Vergokan") for a purchase price of $57,899, net of cash received. Vergokan is a leading manufacturer of cable tray and cable ladder systems, underfloor installations and industrial floor trunking that serves industrial, power and energy, commercial and infrastructure sectors in more than 45 countries. This transaction provides Atkore with an expanded presence in Western Europe and strengthens the Company's electrical portfolio of cable management products within the Electrical Raceway segment. The Company incurred approximately $148 for acquisition-related expenses for Vergokan which were recorded as a component of selling, general and administrative expenses for the three months ended December 28, 2018.

The purchase price was allocated to tangible and intangible assets acquired and liabilities assumed, based on their fair values. The following table summarizes the Level 3 fair values assigned to the net assets acquired and liabilities assumed as of the acquisition date:

10

(in thousands)	Vergokan
Fair value of consideration transferred:
Cash consideration	$	58,728
Fair value of assets acquired and liabilities assumed:
Cash	829
Accounts receivable	8,761
Inventories	11,560
Intangible assets	12,621
Fixed assets	32,490
Accounts payable	(18,669		)
Other	1,680
Net assets acquired	49,272
Excess purchase price attributed to goodwill acquired	$	9,456

The following table summarizes the fair value of intangible assets as of the acquisition date:

	Vergokan
($ in thousands)	Fair Value		Weighted Average Useful Life (Years)
Customer relationships	$	10,535	12.0
Other	2,086		9.0
Total intangible assets	$	12,621

The purchase price allocation, intangible asset values and related estimates of useful lives for Vergokan are preliminary, as the Company is finalizing its fair value estimates of intangible assets, fixed assets and working capital items.

On January 8, 2018, the Company acquired the assets of Communications Integrators, Inc. ("Cii"), a manufacturer of modular, prefabricated power, voice and data distribution systems located in Tempe, Arizona for a total purchase price, including contingent consideration, of $3,997.

4. POSTRETIREMENT BENEFITS

The Company provides pension benefits through a number of noncontributory and contributory defined benefit retirement plans covering eligible U.S. employees. As of September 30, 2017, all defined pension benefit plans were frozen, whereby participants no longer accrue credited service. The net periodic benefit credit was as follows: 

		Three months ended
(in thousands)	Note	December 28, 2018			December 29, 2017
Interest cost		$	1,166		$	1,024
Expected return on plan assets		(1,593		)	(1,604		)
Amortization of actuarial loss		25			86
Net periodic benefit credit	6	$	(402	)	$	(494	)

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5. RESTRUCTURING CHARGES

The liability for restructuring reserves is included within other current liabilities in the Company's condensed consolidated balance sheets as follows:

	Electrical Raceway						MP&S						Other/Corporate
(in thousands)	Severance (a)			Other (a)			Severance			Other			Severance			Total
Balance as of September 30, 2017	$	449		$	—		$	278		$	10		$	—		$	737
Charges	536			1,130			97			179			98			2,040
Utilization	(787		)	(820		)	(178		)	(160		)	(98		)	(2,043		)
Reversal	—			—			(191		)	—			—			(191		)
Exchange rate effects	14			—			(6		)	—			—			8
Balance as of September 30, 2018	212			310			—			29			—			551
Charges	285			1,102			—			—			—			1,387
Utilization	(175		)	(1,394		)	—			(29		)	—			(1,598		)
Balance as of December 28, 2018	$	322		$	18		$	—		$	—		$	—		$	340

(a) Primarily related to Atkore's commitment to close certain facilities as part of its continuing effort to realign its strategic focus. The Company recorded severance restructuring charges of $285 and $27 related to termination benefits during the three months endedDecember 28, 2018 and December 29, 2017, respectively. The Company recorded other restructuring charges to close facilities of $1,080 and $300 for the three months endedDecember 28, 2018 and December 29, 2017, respectively.

The Company expects to utilize all restructuring accruals as of December 28, 2018 within the next twelve months. The net restructuring charges included as a component of selling, general and administrative expenses in the Company's condensed consolidated statements of operations were as follows:

	Three months ended
(in thousands)	December 28, 2018		December 29, 2017
Total restructuring charges, net	$	1,387	$	262

6. OTHER INCOME, NET

Other (income) expense, net consisted of the following:

	Three months ended
(in thousands)	December 28, 2018			December 29, 2017
Undesignated foreign currency derivative instruments	(2,579		)	1,224
Foreign exchange (gain) loss on intercompany loans	1,381			(444		)
Pension-related benefits	(402		)	(494		)
Other (income) expense, net	$	(1,600	)	$	286

7. INCOME TAXES

On December 22, 2017, "H.R.1," also known as the "Tax Cuts and Jobs Act" ("TCJA"), was signed into law. TCJA provides for significant changes to corporate taxation including, but not limited to, a reduction of the federal corporate tax rate from 35% to 21%, limitations on the deductibility of interest expense and executive compensation, full expensing of the costs of qualified property in the period of acquisition, the elimination of the domestic production activities deduction and a new provision designed to tax global intangible low-taxed income ("GILTI"). The legislation also adopts a new quasi-territorial tax regime and imposes a one-time transition tax on deemed repatriated earnings of certain foreign subsidiaries.

12

The value of the Company’s net deferred tax liability on the balance sheet decreased as a result of the enacted tax rates creating a one-time tax benefit to the Company; the preliminary analysis of the impact, using December 29, 2017 values, was an estimated decrease to the net deferred tax liability of $4,758, which was recognized in the period of enactment. The SEC Staff Accounting Bulletin No. 118 allowed for a measurement period of up to one year from the date of enactment; during the course of the fiscal year ended September 30, 2018, the Company recorded an adjustment to the re-measurement of deferred tax liabilities of an additional $708 benefit as a result of updated estimates. For the three months ended December 28, 2018, the Company finalized the re-measurement with no additional adjustments. The Company has an accumulated earnings and profit deficit in the foreign jurisdictions in which it operates. The Company has completed its calculation and does not have an income tax liability from the one-time transition tax on the deemed repatriation of its foreign earnings.

The GILTI provision of TCJA requires certain income earned by controlled foreign corporations ("CFCs") to be included currently in the gross income of the CFC's controlling U.S. shareholder. In accordance with accounting standards applicable to income taxes, there is allowed an accounting policy choice of either (1) treating taxes due on U.S. inclusions in taxable income related to GILTI as a current period expense when incurred (the “period cost method”) or (2) factoring such amounts into the Company’s measurement of its deferred taxes (the “deferred method”). The Company has elected the period method and included an estimate of the GILTI tax in the Company’s annualized effective tax rate.

For the three months ended December 28, 2018 and December 29, 2017, the Company's effective tax rate attributable to income before income taxes was 23.2% and 8.5%, respectively. For the three months ended December 28, 2018 and December 29, 2017, the Company's income tax expense was $8,154 and $2,516 respectively. The increase in the effective tax rate was primarily due to the prior year benefit of the one-time re-measurement of deferred taxes as a result of the Tax Cuts and Jobs Act, the prior year domestic manufacturing deduction, which has been repealed for the current year, and a larger excess stock compensation deduction in the period ended December 29, 2017.

The Company has recorded a valuation allowance against net operating losses in certain foreign jurisdictions. A valuation allowance is recorded when it is determined to be more likely than not that deferred tax assets will not be fully realized in the foreseeable future. The realization of deferred tax assets is dependent upon whether the Company can generate future taxable income of appropriate character in the relevant jurisdiction to utilize the assets. For the three months ended December 28, 2018, the Company has partially released a valuation allowance for $266 on deferred tax assets in its Asia Pacific business due to an increase in forecasted taxable income. The amount of the deferred tax assets considered realizable is subject to adjustment in future periods.

The Company recognizes the benefits of uncertain tax positions taken or expected to be taken in tax returns in the provision for income taxes only for those positions that it has determined are more likely than not to be realized upon examination. The Company records interest and penalties related to unrecognized tax benefits as a component of income tax expense. During the three months ended December 28, 2018, the balance of unrecognized tax benefits decreased by $536 upon the resolution of a state audit item.

For the three months ended December 28, 2018, the Company made no additional provision for U.S. or non-U.S. income taxes for unrecognized deferred tax liabilities for temporary differences related to basis differences in investments in subsidiaries, as the investments are essentially permanent in duration.

8. EARNINGS PER SHARE

The Company calculates basic and diluted earnings per common share using the two-class method. Under the two-class method, net earnings are allocated to each class of common stock and participating securities as if all of the net earnings for the period had been distributed. The Company's participating securities consist of share-based payment awards that contain a non-forfeitable right to receive dividends and therefore are considered to participate in undistributed earnings with common stockholders.

Basic earnings per common share excludes dilution and is calculated by dividing the net earnings allocable to common stock by the weighted-average number of common stock outstanding for the period. Diluted earnings per common share is calculated by dividing net earnings allocated to common stock by the weighted-average number of shares outstanding for the period, as adjusted for the potential dilutive effect of non-participating share-based awards.

13

The following table sets forth the computation of basic and diluted earnings per share:

	Three months ended
(in thousands, except per share data)	December 28, 2018		December 29, 2017
Numerator:
Net income	$	26,949	$	27,189
Less: Undistributed earnings allocated to participating securities	653		217
Net income available to common shareholders	$	26,296	$	26,972
Denominator:
Basic weighted average common shares outstanding	46,995		63,316
Effect of dilutive securities: Non-participating employee stock options (1)	1,288		2,589
Diluted weighted average common shares outstanding	48,283		65,905
Basic earnings per share	$	0.56	$	0.43
Diluted earnings per share	$	0.54	$	0.41
(1) Stock options to purchase approximately 0.6 million and 0.4 million shares of common stock were outstanding during the three months ended December 28, 2018 and December 29, 2017, respectively, but were not included in the calculation of diluted earnings per share as the impact of these options would have been anti-dilutive.

9. ACCUMULATED OTHER COMPREHENSIVE LOSS

The following table presents the changes in accumulated other comprehensive loss by component, net of tax:

(in thousands)	Defined benefit pension items			Currency translation adjustments			Total
Balance as of September 30, 2018	$	(6,048	)	$	(10,390	)	$	(16,438	)
Other comprehensive income before reclassifications	—			(2,746		)	(2,746		)
Amounts reclassified from accumulated other comprehensive loss	25			—			25
Net current period other comprehensive (loss) income	25			(2,746		)	(2,721		)
Balance as of December 28, 2018	$	(6,023	)	$	(13,136	)	$	(19,159	)

10. INVENTORIES, NET

A majority of the Company's inventories are recorded at the lower of cost (primarily last in, first out, or "LIFO") or market. Approximately 75% and 80% of the Company's inventories were valued at the lower of LIFO cost or market at December 28, 2018 and September 30, 2018, respectively. Interim LIFO determinations, including those at December 28, 2018, are based on management's estimates of future inventory levels and costs for the remainder of the current fiscal year.

(in thousands)	December 28, 2018		September 30, 2018
Purchased materials and manufactured parts, net	$	61,342	$	58,572
Work in process, net	21,843		21,769
Finished goods, net	143,402		141,412
Inventories, net	$	226,587	$	221,753

Total inventories would be $21,982 and $26,340 higher than reported as of December 28, 2018 and September 30, 2018, respectively, if the first-in, first-out method was used for all inventories. As of December 28, 2018 and September 30, 2018, the excess and obsolete inventory reserve was $15,046 and $12,909, respectively.

14

11. PROPERTY, PLANT AND EQUIPMENT

As of December 28, 2018 and September 30, 2018, property, plant and equipment at cost and accumulated depreciation were as follows:

(in thousands)	December 28, 2018			September 30, 2018
Land	$	19,939		$	13,295
Buildings and related improvements	121,017			108,758
Machinery and equipment	286,355			262,078
Leasehold improvements	7,835			7,382
Software	24,105			30,502
Construction in progress	17,234			16,777
Property, plant and equipment	476,485			438,792
Accumulated depreciation	(234,786		)	(225,684		)
Property, plant and equipment, net	$	241,699		$	213,108

Depreciation expense for the three months ended December 28, 2018 and December 29, 2017 totaled $9,807 and $8,523, respectively.

12. GOODWILL AND INTANGIBLE ASSETS

Changes in the carrying amount of goodwill are as follows:

(in thousands)	Electrical Raceway			Mechanical Products & Solutions		Total
Balance as of October 1, 2018	$	133,566		$	36,563	$	170,129
Goodwill acquired during year	9,456			—		9,456
Exchange rate effects	(788		)	—		(788		)
Balance as of December 28, 2018	$	142,234		$	36,563	$	178,797

Goodwill balances as of October 1, 2018 and December 28, 2018 include $3,924 and $43,000 of accumulated impairment losses within the Electrical Raceway and MP&S segments, respectively.

The Company assesses the recoverability of goodwill and indefinite-lived trade names on an annual basis in accordance with ASC 350, "Intangibles - Goodwill and Other." The measurement date is the first day of the fourth fiscal quarter, or more frequently, if events or circumstances indicate that it is more likely than not that the fair value of a reporting unit or the respective indefinite-lived trade name is less than the carrying value.

The following table provides the gross carrying value, accumulated amortization and net carrying value for each major class of intangible assets:

		December 28, 2018							September 30, 2018
($ in thousands)	Weighted Average Useful Life (Years)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Amortizable intangible assets:
Customer relationships	10	$	339,581	$	(148,773	)	$	190,808	$	330,295	$	(141,401	)	$	188,894
Other	8	18,086		(6,571		)	11,515		16,003		(5,861		)	10,142
Total		357,667		(155,344		)	202,323		346,298		(147,262		)	199,036
Indefinite-lived intangible assets:
Trade names		92,880		—			92,880		92,880		—			92,880
Total		$	450,547	$	(155,344	)	$	295,203	$	439,178	$	(147,262	)	$	291,916

15

Other intangible assets consist of definite-lived trade names, technology, non-compete agreements and backlogs. Amortization expense for the three months ended December 28, 2018 and December 29, 2017 was $8,214 and $8,687, respectively. Expected amortization expense for intangible assets for the remainder of fiscal 2019 and over the next five years and thereafter is as follows:

(in thousands)
Remaining 2019	$	26,106
2020	30,310
2021	30,176
2022	28,843
2023	28,791
2024	24,094
Thereafter	34,003

Actual amounts of amortization may differ from estimated amounts due to additional intangible asset acquisitions, impairment of intangible assets and other events.

13. DEBT

Debt as of December 28, 2018 and September 30, 2018 was as follows:

(in thousands)	December 28, 2018			September 30, 2018
First Lien Term Loan Facility due December 22, 2023	$	912,207		$	912,162
Deferred financing costs	(7,788		)	(8,194		)
Other	236			279
Total debt	$	904,655		$	904,247
Less: Current portion	26,561			26,561
Long-term debt	$	878,094		$	877,686

The asset-based credit facility (the "ABL Credit Facility") has aggregate commitments of $325,000 and is guaranteed by AIH and the U.S. operating companies owned by AII. AII's availability under the ABL Credit Facility was $274,954 and $315,119 as of December 28, 2018 and September 30, 2018, respectively.

14. FAIR VALUE MEASUREMENTS

Certain assets and liabilities are required to be recorded at fair value on a recurring basis.

The Company uses forward currency contracts to hedge the effects of foreign exchange relating to certain of the Company’s intercompany receivables denominated in a foreign currency. These derivative instruments are not formally designated as hedges by the Company and the terms of these instruments range from six months to five years. Short-term forward currency contracts are recorded in other current liabilities and long-term forward currency contracts are recorded in other long-term liabilities in the condensed consolidated balance sheet. The fair value gains and losses are included in other (income) expense, net within the condensed consolidated statements of operations. See Note 6, ''Other Income, net'' for further detail.

The total notional amount of undesignated forward currency contracts were £46.4 million and £49.1 million as of December 28, 2018 and September 30, 2018, respectively. Cash flows associated with derivative financial instruments are recognized in the operating section of the condensed consolidated statements of cash flows. The fair value of forward currency contracts is calculated by reference to current forward exchange rates for contracts with similar maturity profiles.

16

The following table presents the Company's assets and liabilities measured at fair value:

	December 28, 2018						September 30, 2018
(in thousands)	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Assets
Cash equivalents	$	38,771	$	—	$	—	$	28,175	$	—	$	—
Forward currency contracts	—		727		—		—		—		—
Liabilities
Forward currency contracts	—		68		—		—		1,857		—

In addition to the recurring assets and liabilities measured at fair value, the Company has a contingent consideration liability of $550 measured at fair value related to the Cii acquisition, which was settled in January 2019. The liability is valued using significant unobservable inputs (Level 3) based on the probability of achievement of first year earnings post acquisition.

The Company's remaining financial instruments consist primarily of cash, accounts receivable and accounts payable whose carrying value approximate their fair value due to their short-term nature.

The estimated fair value of financial instruments not carried at fair value in the condensed consolidated balance sheets were as follows:

	December 28, 2018				September 30, 2018
(in thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
First Lien Term Loan Facility due December 22, 2023	$	913,100	$	862,880	$	913,100	$	916,113

In determining the approximate fair value of its long-term debt, the Company used the trading values among financial institutions, which were classified within Level 2 of the fair value hierarchy. The carrying value of the ABL Credit Facility approximates fair value due to it being a market-linked variable rate debt.

15. COMMITMENTS AND CONTINGENCIES

The Company has obligations related to commitments to purchase certain goods. As of December 28, 2018, such obligations were $197,115 for the rest of fiscal year 2019 and $801 for fiscal year 2020. These amounts represent open purchase orders for materials used in production.

Legal Contingencies — The Company is a defendant in a number of pending legal proceedings, some of which were inherited from its former parent, Tyco International Ltd. ("Tyco"), including certain product liability claims. Several lawsuits have been filed against the Company and the Company has also received other claim demand letters alleging that the Company's anti-microbial coated steel sprinkler pipe, which the Company has not manufactured or sold for several years, is incompatible with chlorinated polyvinyl chloride and caused stress cracking in such pipe manufactured by third parties when installed together in the same sprinkler system, which the Company refers to collectively as the "Special Products Claims." After an analysis of claims experience, the Company reserved its best estimate of the probable and reasonably estimable losses related to these matters. The Company's total product liability reserves for Special Products Claims and other product liability matters were $1,235 and $6,755 as of December 28, 2018 and September 30, 2018, respectively. As of December 28, 2018, the Company believes that the range of losses for Special Products Claims and other product liabilities is between $1,000 and $9,000.

During the quarter ended December 28, 2018, Tyco and the Company agreed with a plaintiff to settle one Special Products Claim that was to go to trial.  The Company agreed to fund the total settlement in exchange for Tyco's agreement to cap the Company's Special Products Claim deductible at $12,000, as opposed to the $13,000 cap negotiated within the original indemnity agreement. Tyco and the Company are examining the Company's total Special Products Claim payments which are nearly $12,000 with the aforementioned settlement payment and as of December 28, 2018, the Company believes that it has recorded $12,000 of cumulative expense related to these Special Products Claims.  From and after the point where the Company has spent $12,000 on Special Products Claims, Tyco, now Johnson Controls International plc, has a contractual obligation to indemnify the Company in respect of claims of incompatibility between the Company's antimicrobial coated steel sprinkler pipe and CPVC pipe used in the same sprinkler system.

17

At this time, the Company does not expect the outcome of the Special Products Claims proceedings, either individually or in the aggregate, to have a material adverse effect on its business, financial condition, results of operations or cash flows, and the Company believes that its reserves are adequate for all remaining contingencies for Special Products Claims.

In addition to the matters discussed above, from time to time, the Company is subject to a number of disputes, administrative proceedings and other claims arising out of the ordinary conduct of the Company's business. These matters generally relate to disputes arising out of the use or installation of the Company's products, product liability litigation, contract disputes, patent infringement accusations, employment matters, personal injury claims and similar matters. On the basis of information currently available to the Company, it does not believe that existing proceedings and claims will have a material adverse effect on its business, financial condition, results of operations or cash flows. However, litigation is unpredictable, and the Company could incur judgments or enter into settlements for current or future claims that could adversely affect its business, financial condition, results of operations or cash flows.

16. GUARANTEES

The Company had outstanding letters of credit totaling $10,979 supporting workers' compensation and general liability insurance policies as of December 28, 2018. The Company also had surety bonds primarily related to performance guarantees on supply agreements and construction contracts, and payment of duties and taxes totaling $25,199 as of December 28, 2018.

In disposing of assets or businesses, the Company often provides representations, warranties and indemnities to cover various risks including unknown damage to the assets, environmental risks involved in the sale of real estate, liability to investigate and remediate environmental contamination at waste disposal sites and manufacturing facilities, and unidentified tax liabilities and legal fees related to periods prior to disposition. The Company does not have the ability to estimate the potential liability from such indemnities because they relate to unknown conditions. However, the Company has no reason to believe that these uncertainties would have a material adverse effect on the Company's business, financial condition, results of operations or cash flows.

In the normal course of business, the Company is liable for product performance and contract completion. In the opinion of management, such obligations will not have a material adverse effect on the Company's business, financial condition, results of operations or cash flows.

17. SEGMENT INFORMATION

The Company has two operating segments, which are also its reportable segments. The Company's operating segments are organized based upon primary market channels and, in most instances, the end use of products.

Through its Electrical Raceway segment, the Company manufactures products that deploy, isolate and protect a structure's electrical circuitry from the original power source to the final outlet. These products, which include electrical conduit, armored cable, cable trays, mounting systems and fittings, are critical components of the electrical infrastructure for maintenance, repair and remodel markets. The vast majority of the Company's Electrical Raceway net sales are made to electrical distributors, who then serve electrical contractors and the Company considers both to be customers.

Through the MP&S segment, the Company provides products and services that frame, support and secure component parts in a broad range of structures, equipment and systems in electrical, industrial and construction applications. The Company's principal products in this segment are metal framing products and in-line galvanized mechanical tube. Through its metal framing business, the Company designs, manufactures and installs metal strut and fittings used to assemble mounting structures that support heavy equipment and electrical content in buildings and other structures.

Both segments use Adjusted EBITDA as the primary measure of profit and loss. Segment Adjusted EBITDA is the sum of income (loss) from operations before income taxes, adjusted to exclude unallocated expenses, depreciation and amortization, interest expense, net, gain (loss) on extinguishment of debt, restructuring and impairments, stock-based compensation, certain legal matters, transaction costs, gain on sale of joint venture and other items, such as inventory reserves and adjustments, release of indemnified uncertain tax positions, and the impact of foreign exchange gains or losses.

18

Intersegment transactions primarily consist of product sales at designated transfer prices on an arm's-length basis. Gross profit earned and reported within the segment is eliminated in the Company's consolidated results. Certain manufacturing and distribution expenses are allocated between the segments on a pro rata basis due to the shared nature of activities. Recorded amounts represent a proportional amount of the quantity of product produced for each segment. Certain assets, such as machinery and equipment and facilities, are not allocated to each segment despite serving both segments. These shared assets are reported within the MP&S segment. We allocate certain corporate operating expenses that directly benefit our operating segments, such as insurance and information technology, on a basis that reasonably approximates an estimate of the use of these services.

	Three months ended
	December 28, 2018							December 29, 2017
(in thousands)	External Net Sales		Intersegment Sales			Adjusted EBITDA		External Net Sales		Intersegment Sales			Adjusted EBITDA
Electrical Raceway	$	343,215	$	191		$	68,489	$	316,005	$	518		$	56,160
MP&S	108,813		—			$	10,887	98,553		21			$	10,809
Eliminations	—		(191		)			—		(539		)
Consolidated operations	$	452,028	$	—				$	414,558	$	—

Presented below is a reconciliation of operating segment Adjusted EBITDA to Income before income taxes:

	Three months ended
(in thousands)	December 28, 2018			December 29, 2017
Operating segment Adjusted EBITDA
Electrical Raceway	$	68,489		$	56,160
MP&S	10,887			10,809
Total	79,376			66,969
Unallocated expenses (a)	(9,353		)	(8,482		)
Depreciation and amortization	(18,021		)	(17,210		)
Interest expense, net	(12,160		)	(6,594		)
Restructuring and impairments	(1,387		)	(262		)
Stock-based compensation	(2,982		)	(3,564		)
Transaction costs	(164		)	(645		)
Other (b)	(206		)	(507		)
Income before income taxes	$	35,103		$	29,705

(a) Represents unallocated selling, general and administrative activities and associated expenses including, in part, executive, legal, finance, human resources, information technology, business development and communications, as well as certain costs and earnings of employee-related benefits plans, such as stock-based compensation and a portion of self-insured medical costs.

(b) Represents other items, such as inventory reserves and adjustments, release of indemnified uncertain tax positions and the impact of foreign exchange gains or losses.

The Company's net sales by geography were as follows for the three months endedDecember 28, 2018 and December 29, 2017:

	Three months ended
(in thousands)	December 28, 2018		December 29, 2017
United States	$	395,628	$	373,828
Other Americas	9,232		8,001
Europe	33,862		20,300
Asia-Pacific	13,306		12,429
Total	$	452,028	$	414,558

19

The table below shows the amount of net sales from external customers for each of the Company's product categories which accounted for 10% or more of consolidated net sales in either period for the three months endedDecember 28, 2018 and December 29, 2017:

(in thousands)	December 28, 2018		December 29, 2017
Metal Electrical Conduit and Fittings	$	131,247	$	108,263
Armored Cable and Fittings	84,345		86,215
PVC Electrical Conduit and Fittings	68,233		76,225
Cable Tray and Cable Ladders	45,774		34,116
Other raceway products	13,616		11,186
Electrical Raceway	343,215		316,005
Mechanical Pipe	60,668		50,645
Metal Framing and Fittings	28,611		24,902
Other MP&S products	19,534		18,150
Impact of Fence and Sprinkler	—		4,856
MP&S	108,813		98,553
Net sales	$	452,028	$	414,558

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Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations

The following information should be read in conjunction with the unaudited condensed consolidated financial statements and related notes included in this report. The following discussion may contain forward-looking statements that reflect our plans, estimates and beliefs. Our actual results could differ materially from those discussed in these forward- looking statements. Factors that could cause or contribute to these differences include those factors discussed below and included or referenced elsewhere in this report, particularly in the sections entitled "Forward-Looking Statements" and "Risk Factors".

Use of Non-GAAP Measures

Adjusted EBITDA and Adjusted EBITDA Margin

We use Adjusted EBITDA and Adjusted EBITDA Margin in evaluating the performance of our business and in the preparation of our annual operating budgets and as indicators of business performance and profitability. We believe Adjusted EBITDA and Adjusted EBITDA Margin allow us to readily view operating trends, perform analytical comparisons and identify strategies to improve operating performance.

We define Adjusted EBITDA as net income (loss) before: depreciation and amortization, interest expense, net, loss (gain) on extinguishment of debt, income tax expense (benefit), restructuring and impairments, stock-based compensation, certain legal matters, transaction costs, gain on sale of a business, gain on sale of joint venture and other items, such as inventory reserves and adjustments and realized or unrealized gain (loss) on foreign currency transactions. We believe Adjusted EBITDA, when presented in conjunction with comparable accounting principles generally accepted in the United States of America ("GAAP") measures, is useful for investors because management uses Adjusted EBITDA in evaluating the performance of our business.We define Adjusted EBITDA Margin as Adjusted EBITDA as a percentage of net sales.

Adjusted EBITDA is not considered a measure of financial performance under GAAP and the items excluded therefrom are significant components in understanding and assessing our financial performance. Adjusted EBITDA has limitations as an analytical tool, and should not be considered in isolation or as an alternative to such GAAP measures as net income (loss), cash flows provided by or used in operating, investing or financing activities or other financial statement data presented in our consolidated financial statements as an indicator of financial performance or liquidity. Some of these limitations are:

• Adjusted EBITDA does not reflect changes in, or cash requirements for, working capital needs;

• Adjusted EBITDA does not reflect interest expense, net, or the requirements necessary to service interest or principal payments on debt;

• Adjusted EBITDA does not reflect income tax expense (benefit) or the cash requirements to pay taxes;

• Adjusted EBITDA does not reflect historical cash expenditures or future requirements for capital expenditures or contractual commitments; and

• although depreciation and amortization charges are non-cash charges, the assets being depreciated and amortized will often have to be replaced in the future, and Adjusted EBITDA does not reflect any cash requirements for such replacements.

Because Adjusted EBITDA is not a measure determined in accordance with GAAP and is susceptible to varying calculations, Adjusted EBITDA, as presented, may not be comparable to other similarly titled measures of other companies.

21

The following table sets forth a reconciliation of net income to Adjusted EBITDA for the three months ended December 28, 2018 and December 29, 2017:

	Three months ended
(in thousands)	December 28, 2018		December 29, 2017
Net income	$	26,949	$	27,189
Interest expense, net	12,160		6,594
Income tax expense	8,154		2,516
Depreciation and amortization	18,021		17,210
Restructuring(a)	1,387		262
Stock-based compensation (b)	2,982		3,564
Transaction costs (c)	164		645
Other (d)	206		507
Adjusted EBITDA	$	70,023	$	58,487

(a) Restructuring amounts represent exit or disposal costs including termination benefits and facility closure costs. See Note 5, ''Restructuring Charges'' to our unaudited condensed consolidated financial statements for further detail.

(b) Represents stock-based compensation expenses related to stock option awards, performance stock awards and restricted stock awards.

(c) Represents expenses related to our acquisition and divestiture-related activities and professional fees associated with share repurchases and secondary offerings

(d) Represents other items, such as inventory reserves and adjustments, realized or unrealized gain (loss) on foreign currency transactions and release of certain indemnified uncertain tax positions.

Results of Operations

The results of operations for the three months ended December 28, 2018 and December 29, 2017 were as follows:

	Three months ended
($ in thousands)	December 28, 2018			December 29, 2017			Change			% Change
Net sales	$	452,028		$	414,558		$	37,470		9.0	%
Cost of sales	341,772			317,691			24,081			7.6	%
Gross profit	110,256			96,867			13,389			13.8	%
Selling, general and administrative	56,379			51,595			4,784			9.3	%
Intangible asset amortization	8,214			8,687			(473		)	(5.4	)%
Operating income	45,663			36,585			9,078			24.8	%
Interest expense, net	12,160			6,594			5,566			84.4	%
Other (income) expense, net	(1,600		)	286			(1,886		)	(659.4	)%
Income before income taxes	35,103			29,705			5,398			18.2	%
Income tax expense	8,154			2,516			5,638			224.1	%
Net income	$	26,949		$	27,189		$	(240	)	(0.9	)%
Non-GAAP financial data
Adjusted EBITDA	$	70,023		$	58,487		$	11,536		19.7	%
Adjusted EBITDA Margin	15.5		%	14.1		%

22

Net sales

	% Change
Volume	(2.6	)%
Average selling prices	9.6	%
Foreign exchange	—	%
Acquisitions/Divestitures	2.0	%
Net sales	9.0	%

Net sales increased$37.5 million, or 9.0% to $452.0 million for the three months ended December 28, 2018 compared to $414.6 million for the three months ended December 29, 2017. Net sales increased$39.8 million primarily due to increased average market prices for the metal electrical conduit product category and the pass-through impact of higher average input costs of steel, copper, and freight. Additionally, net sales increased$13.0 million due to the acquisitions of Vergokan International NV ("Vergokan") and Communications Integrators, Inc. ("Cii") over the past twelve months, partly offset by a decrease in net sales of $4.9 million from the sale of the assets of FlexHead Industries, Inc. and SprinkFLEX, LLC (together "Flexhead") in the second quarter of fiscal 2018. The increase in net sales was partially offset by lower volume of $11.0 million primarily in the metal conduit and cable wire product categories sold within the Electrical Raceway segment.

Cost of sales

	% Change
Volume	(2.8	)%
Average input costs	5.3	%
Acquisitions/Divestitures	2.7	%
Other	2.4	%
Cost of sales	7.6	%

Cost of sales increased by $24.1 million, or 7.6% to $341.8 million for the three months ended December 28, 2018 compared to $317.7 million for the three months ended December 29, 2017. The increase was primarily due to higher input costs of steel and copper of $16.8 million and higher freight costs of $5.6 million. Cost of sales also increased $11.9 million due to acquisitions over the past twelve months, partly offset by a reduction in costs of $3.3 million due to divestiture of Flexhead in the second quarter of fiscal 2018. The increase in cost of sales was partially offset by the impact of lower net sales volume of $8.8 million.

Selling, general and administrative

Selling, general and administrative expenses increased$4.8 million, or 9.3%, to $56.4 million for the three months ended December 28, 2018 compared to $51.6 million for the three months ended December 29, 2017. The increase was primarily due to $2.0 million of higher selling, general and administrative costs resulting from acquisitions, net of divestitures, during fiscal 2019 and fiscal 2018, $1.1 million of higher restructuring costs due to facility closures, and $0.9 million of higher compensation expense due to variable compensation.

Intangible asset amortization

Intangible asset amortization expense decreased $0.5 million, or 5.4%, to $8.2 million for the three months ended December 28, 2018 compared to $8.7 million for the three months ended December 29, 2017 due to the Flexhead divestiture partially offset by acquisitions during fiscal 2019 and fiscal 2018. See Note 3, ''Acquisitions'', to our unaudited condensed consolidated financial statements for further detail.

Interest expense, net

Interest expense, net increased$5.6 million, or 84.4% to $12.2 million for the three months ended December 28, 2018 compared to $6.6 million for the three months ended December 29, 2017. The increase is primarily due to our debt refinancing transactions on February 2, 2018, which resulted in additional borrowings of $425.0 million.

23

Other (income) expense, net

Other (income) expense, net changed$1.9 million to $1.6 million of income for the three months ended December 28, 2018 compared to $0.3 million of expense for the three months ended December 29, 2017 primarily due to the gain on foreign currency derivative instruments of $2.6 million, partially offset by foreign exchange losses on intercompany loans of $1.4 million. See Note 6, ''Other Income, net'', to our unaudited condensed consolidated financial statements for further detail.

Income tax expense

The Company's income tax rate increased to 23.2% for the three months ended December 28, 2018 compared to 8.5% for the three months ended December 29, 2017. The increase in the effective tax rate was primarily due to the prior year benefit of the one-time re-measurement of deferred taxes as a result of the Tax Cuts and Jobs Act, the prior year domestic manufacturing deduction, which has been repealed for the current year, and a larger excess stock compensation deduction in the period ended December 29, 2017.

Net income

Net income decreased by $0.2 million, or 0.9% to $26.9 million for the three months ended December 28, 2018 compared to $27.2 million for the three months ended December 29, 2017 primarily due to higher income tax expense of $5.6 million and higher interest expense of $5.6 million, partially offset by higher operating income of $9.1 million.

Adjusted EBITDA

Adjusted EBITDA increased by $11.5 million, or 19.7% to $70.0 million for the three months ended December 28, 2018 compared to $58.5 million for the three months ended December 29, 2017. The increase was primarily due to higher operating income of $9.1 million and incremental Adjusted EBITDA of $2.1 million from acquisitions during fiscal 2019 and fiscal 2018, partially offset by the divestiture of Flexhead during the second quarter of fiscal 2018.

Segment results

Electrical Raceway

	Three months ended
($ in thousands)	December 28, 2018			December 29, 2017			Change		% Change
Net sales	$	343,406		$	316,523		$	26,883	8.5	%
Adjusted EBITDA	$	68,489		$	56,160		$	12,329	22.0	%
Adjusted EBITDA Margin	19.9		%	17.7		%

Net sales

	% Change
Volume	(3.5	)%
Average selling prices	7.9	%
Foreign exchange	—	%
Acquisitions	4.1	%
Net sales	8.5	%

Net sales increased$26.9 million, or 8.5%, to $343.4 million for the three months ended December 28, 2018 compared to $316.5 million for the three months ended December 29, 2017. The increase was primarily due to increased average market prices for the metal electrical conduit product category and the pass-through impact of higher average input costs of steel, copper and freight of $25.0 million. Additionally, sales increased $13.0 million resulting from acquisitions during fiscal 2019 and fiscal 2018. The increase in net sales was partially offset by lower volume of $11.0 million primarily in the metal conduit and cable wire product categories.

24

Adjusted EBITDA

Adjusted EBITDA for the three months ended December 28, 2018 increased $12.3 million, or 22.0%, to $68.5 million from $56.2 million for the three months ended December 29, 2017. Adjusted EBITDA margins increased to 19.9% for the three months ended December 28, 2018 compared to 17.7% for the three months ended December 29, 2017. The increase in Adjusted EBITDA was largely due to increased market prices for the metal electrical conduit product category and incremental Adjusted EBITDA resulting from acquisitions during fiscal 2019 and fiscal 2018. The increase in Adjusted EBITDA was partially offset by lower volume for the metal conduit and cable wire product categories.

Mechanical Products & Solutions

	Three months ended
($ in thousands)	December 28, 2018			December 29, 2017			Change		% Change
Net sales	$	108,813		$	98,574		$	10,239	10.4	%
Adjusted EBITDA	$	10,887		$	10,809		$	78	0.7	%
Adjusted EBITDA Margin	10.0		%	11.0		%

Net sales

	% Change
Average selling prices	15.0	%
Divestitures	(5.0	)%
Other	0.4	%
Net sales	10.4	%

Net sales increased$10.2 million, or 10.4%, for the three months ended December 28, 2018 to $108.8 million compared to $98.6 million for the three months ended December 29, 2017. The increase was primarily due to $14.8 million of higher average selling prices, partly offset by a decrease in net sales of $4.9 million due to the divestiture of Flexhead in the second quarter of fiscal 2018.

Adjusted EBITDA

Adjusted EBITDA increased $0.1 million, or 0.7%, to $10.9 million for the three months ended December 28, 2018 compared to $10.8 million for the three months ended December 29, 2017. Adjusted EBITDA margins decreased to 10.0% for the three months ended December 28, 2018 compared to 11.0% for the three months ended December 29, 2017. Adjusted EBITDA increased primarily due to the higher average selling prices, partially offset by the divestiture of Flexhead during the second quarter of fiscal 2018.

Liquidity and Capital Resources

We believe we have sufficient liquidity to support our ongoing operations and to invest in future growth and create value for stockholders. Our cash and cash equivalents were $75.9 million as of December 28, 2018, of which $36.1 million was held at non-U.S. subsidiaries. Those cash balances at foreign subsidiaries may be subject to withholding or local country taxes if the Company's intention to permanently reinvest such income were to change and cash was repatriated to the United States. Our cash and cash equivalents decreased$50.7 million from September 30, 2018 primarily due to the acquisition of Vergokan.

In general, we require cash to fund working capital investments, acquisitions, capital expenditures, debt repayment, interest payments, taxes and share repurchases. We have access to the ABL Credit Facility to fund operational needs. As of December 28, 2018, there were no outstanding borrowings under the ABL Credit Facility and $11.0 million of letters of credit issued under the ABL Credit Facility. The borrowing base was estimated to be $285.9 million and approximately $275.0 million was available under the ABL Credit Facility as of December 28, 2018. Outstanding letters of credit count as utilization of the commitments under the ABL Credit Facility and reduce the amount available for borrowings.

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The agreements governing the First Lien Term Loan Facility and the ABL Credit Facility (collectively, the "Credit Facilities") contain covenants that limit or restrict AII's ability to incur additional indebtedness, repurchase debt, incur liens, sell assets, make certain payments (including dividends) and enter into transactions with affiliates. AII has been in compliance with the covenants under the agreements for all periods presented.

We may from time to time repurchase our debt or take other steps to reduce our debt. These actions may include open market repurchases, negotiated repurchases or opportunistic refinancing of debt. The amount of debt, if any, that may be repurchased or refinanced will depend on market conditions, trading levels of our debt, our cash position, compliance with debt covenants and other considerations.

Our use of cash may fluctuate during the year and from year to year due to differences in demand and changes in economic conditions primarily related to the prices of commodities we purchase.

Capital expenditures have historically been necessary to expand and update the production capacity and improve the productivity of our manufacturing operations.

Our ongoing liquidity needs are expected to be funded by cash on hand, net cash provided by operating activities and, as required, borrowings under the ABL Credit Facility. We expect that cash provided from operations and available capacity under the ABL Credit Facility will provide sufficient funds to operate our business, make expected capital expenditures and meet our liquidity requirements for at least the next twelve months, including payment of interest and principal on our debt.

Limitations on Distributions and Dividends by Subsidiaries

AIG, AII, and AIH are each holding companies, and as such have no independent operations or material assets other than ownership of equity interests in their respective subsidiaries. Each company depends on its respective subsidiaries to distribute funds to it so that it may pay obligations and expenses, including satisfying obligations with respect to indebtedness. The ability of our subsidiaries to make distributions and dividends to us depends on their operating results, cash requirements and financial and general business conditions, as well as restrictions under the laws of our subsidiaries' jurisdictions.

The agreements governing the ABL Credit Facility significantly restrict the ability of our subsidiaries, including AII, to pay dividends, make loans or otherwise transfer assets from AII and, in turn, to us. Further, AII's subsidiaries are permitted under the terms of the ABL Credit Facility to incur additional indebtedness that may restrict or prohibit the making of distributions, the payment of dividends or the making of loans by such subsidiaries to AII and, in turn, to us. The First Lien Term Loan Facility requires AII to meet a certain consolidated coverage ratio on an incurrence basis in connection with additional indebtedness. The ABL Credit Facility contains limits on additional indebtedness based on various conditions for incurring the additional debt.

26

The table below summarizes cash flow information derived from our statements of cash flows for the periods indicated:

	Three months ended
(in thousands)	December 28, 2018			December 29, 2017
Cash flows provided by (used in):
Operating activities	$	40,277		$	48,940
Investing activities	(64,925		)	(7,451		)
Financing activities	(25,176		)	(47,665		)

Operating activities

During the three months ended December 28, 2018, the Company was provided $40.3 million by operating activities compared to $48.9 million during the three months ended December 29, 2017. The $8.7 million decrease in cash provided was primarily due to higher investments in working capital of $13.1 million compared to the prior year due to higher material input costs.

Investing activities

During the three months ended December 28, 2018, the Company used $64.9 million in investing activities compared to using $7.5 million during the three months ended December 29, 2017. The increase in cash used in investing activities is primarily due the acquisition of Vergokan for $57.9 million, net of cash received.

Financing Activities

During the three months ended December 28, 2018, the Company used $25.2 million in financing activities compared to $47.7 million used during the three months ended December 29, 2017. The use of cash in the three months ended December 28, 2018 was primarily related to $24.4 million of share repurchases. During the three months ended December 29, 2017, the Company repaid $247.0 million in borrowings from the line of credit, which was partially offset by additional borrowings of $204.0 million on the line of credit.

Contractual Obligations and Commitments

There have been no other material changes in our contractual obligations and commitments since the filing of our Annual Report on Form 10-K.

Change in Critical Accounting Policies and Estimates

There have been no material changes in our critical accounting policies and estimates since the filing of our Annual Report on Form 10-K.

27

Recent Accounting Standards

See Note 1, ''Basis of Presentation and Summary of Significant Accounting Policies'' to our unaudited condensed consolidated financial statements.

Forward-Looking Statements

This Quarterly Report on Form 10-Q contains forward-looking statements and cautionary statements within the meaning of the Private Securities Litigation Reform Act of 1995 that are based on management's beliefs and assumptions and information currently available to management. Some of the forward-looking statements can be identified by the use of forward-looking terms such as "believes," "expects," "may," "will," "shall," "should," "would," "could," "seeks," "aims," "projects," "is optimistic," "intends," "plans," "estimates," "anticipates" or other comparable terms. Forward-looking statements include, without limitation, all matters that are not historical facts. They appear in a number of places throughout this Quarterly Report on Form 10-Q and include, without limitation, statements regarding our intentions, beliefs, assumptions or current expectations concerning, among other things, financial position; results of operations; cash flows; prospects; growth strategies or expectations; customer retention; the outcome (by judgment or settlement) and costs of legal, administrative or regulatory proceedings, investigations or inspections, including, without limitation, collective, representative or class action litigation; and the impact of prevailing economic conditions.

Forward-looking statements are subject to known and unknown risks and uncertainties, many of which may be beyond our control. We caution you that forward-looking statements are not guarantees of future performance or outcomes and that actual performance and outcomes, including, without limitation, our actual results of operations, financial condition and liquidity, and the development of the market in which we operate, may differ materially from those made in or suggested by the forward-looking statements contained in this quarterly report. In addition, even if our results of operations, financial condition and cash flows, and the development of the market in which we operate, are consistent with the forward-looking statements contained in this quarterly report, those results or developments may not be indicative of results or developments in subsequent periods. A number of important factors, including, without limitation, the risks and uncertainties discussed or referenced under the caption "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" in our Annual Reports on Form 10-K and Quarterly Reports on Form 10-Q, could cause actual results and outcomes to differ materially from those reflected in the forward-looking statements. Additional factors that could cause actual results and outcomes to differ from those reflected in forward-looking statements include, without limitation:

• declines in, and uncertainty regarding, the general business and economic conditions in the United States and international markets in which we operate;

• weakness or another downturn in the United States non-residential construction industry;

• changes in prices of raw materials;

• pricing pressure, reduced profitability, or loss of market share due to intense competition;

• availability and cost of third-party freight carriers and energy;

• high levels of imports of products similar to those manufactured by us;

• changes in federal, state, local and international governmental regulations and trade policies;

• adverse weather conditions;

• failure to generate sufficient cash flow from operations or to raise sufficient funds in the capital markets to satisfy existing obligations and support the development of our business;

• increased costs relating to future capital and operating expenditures to maintain compliance with environmental, health and safety laws;

• reduced spending by, deterioration in the financial condition of, or other adverse developments with respect to, one or more of our top customers;

• increases in our working capital needs, which are substantial and fluctuate based on economic activity and the market prices for our main raw materials, including as a result of failure to collect, or delays in the collection of, cash from the sale of manufactured products;

• work stoppage or other interruptions of production at our facilities as a result of disputes under existing collective bargaining agreements with labor unions or in connection with negotiations of new collective bargaining agreements, as a result of supplier financial distress, or for other reasons;

• challenges attracting and retaining key personnel or high-quality employees;

• changes in our financial obligations relating to pension plans that we maintain in the United States;

• reduced production or distribution capacity due to interruptions in the operations of our facilities or those of our key suppliers;

• loss of a substantial number of our third-party agents or distributors or a dramatic deviation from the amount of sales they generate;

28

• security threats, attacks, or other disruptions to our information systems, or failure to comply with complex network security, data privacy and other legal obligations or the failure to protect sensitive information;

• possible impairment of goodwill or other long-lived assets as a result of future triggering events, such as declines in our cash flow projections or customer demand;

• safety and labor risks associated with the manufacture and the testing of our products;

• product liability, construction defect and warranty claims and litigation relating to our various products, as well as government inquiries and investigations, and consumer, employment, tort and other legal proceedings;

• our ability to protect our intellectual property and other material proprietary rights;

• risks inherent in doing business internationally;

• our inability to introduce new products effectively or implement our innovation strategies;

• the inability of our customers to pay off the credit lines extended to them by us in a timely manner and the negative impact on customer relations resulting from our collections efforts with respect to non-paying or slow-paying customers;

• our inability to continue importing raw materials, component parts and/or finished goods;

• changes as a result of comprehensive tax reform;

• the incurrence of liabilities and the issuance of additional debt or equity in connection with acquisitions, joint ventures or divestitures and the failure of indemnification provisions in our acquisition agreements to fully protect us from unexpected liabilities;

• failure to manage acquisitions successfully, including identifying, evaluating, and valuing acquisition targets and integrating acquired companies, businesses or assets;

• the incurrence of liabilities in connection with violations of the FCPA and similar foreign anti-corruption laws;

• the incurrence of additional expenses, increase in complexity of our supply chain and potential damage to our reputation with customers resulting from regulations related to "conflict minerals";

• disruptions or impediments to the receipt of sufficient raw materials resulting from various anti-terrorism security measures;

• restrictions contained in our debt agreements;

• failure to generate cash sufficient to pay the principal of, interest on, or other amounts due on our debt; and

• other risks and factors described in this report and from time to time in documents that we file with the SEC.

You should read this Quarterly Report on Form 10-Q completely and with the understanding that actual future results may be materially different from expectations. All forward-looking statements attributable to us or persons acting on our behalf that are made in this quarterly report are qualified in their entirety by these cautionary statements. These forward-looking statements are made only as of the date of this Quarterly Report on Form 10-Q, and we do not undertake any obligation, other than as may be required by law, to update or revise any forward-looking or cautionary statements to reflect changes in assumptions, the occurrence of events, unanticipated or otherwise, and changes in future operating results over time or otherwise.

Comparisons of results for current and any prior periods are not intended to express any future trends, or indications of future performance, unless expressed as such, and should only be viewed as historical data.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

There have been no material changes to the quantitative and qualitative disclosures about market risks previously disclosed in our Annual Report on Form 10-K.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) or 15d-15(e) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), as of the end of the period covered by this report. In designing and evaluating the disclosure controls and procedures, management recognized that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives. In addition, the design of disclosure controls and procedures must reflect the fact that there are resource constraints and that management is required to apply its judgment in evaluating the benefits of possible controls and procedures relative to their costs.

29

Based on that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures as of the end of the period covered by this Quarterly Report on Form 10-Q were effective to provide reasonable assurance that information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There have been no changes to our internal control over financial reporting in connection with the evaluation required by Rules 13a-15(d) and 15d-15(d) under the Exchange Act during the most recent fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

30

PART II - OTHER INFORMATION

Item 1. Legal Proceedings

For a discussion of certain litigation involving the Company, see Note 15, ''Commitments and Contingencies'' to our unaudited condensed consolidated financial statements.

Item 1A. Risk Factors

There have been no material changes to the risk factors previously disclosed in our Annual Report on Form 10-K.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Issuer Purchases of Equity Securities

The following table shows our purchases of our common stock during the three months ended December 28, 2018:

Period	Total Number of Shares Purchased	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Program(1)	Maximum Value of Shares that May Yet Be Purchased Under the Program(1)
December 1, 2018 - December 28, 2018	1,229.8	$	19.85	1,229.8	$	—
Total	1,229.8			1,229.8

(1) In August 2017, the Company announced that its board of directors had approved a share repurchase program for the repurchase of up to an aggregate amount of $75 million of the Company’s common stock. As of December 28, 2018, there were no authorized repurchases remaining.

Item 3. Defaults Upon Senior Securities

Not applicable.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

None.

31

Item 6. Exhibits

31.1#	Certification of Chief Executive Officer Pursuant to Exchange Act Rule 13a - 14, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2#	Certification of Chief Financial Officer Pursuant to Exchange Act Rule 13a - 14, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1#	Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2#	Certification of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS#	XBRL Instance Document
101.SCH#	XBRL Taxonomy Schema Linkbase Document
101.CAL#	XBRL Taxonomy Calculation Linkbase Document
101.DEF#	XBRL Taxonomy Definition Linkbase Document
101.LAB#	XBRL Taxonomy Labels Linkbase Document
101.PRE#	XBRL Taxonomy Presentation Linkbase Document
#	Filed herewith

32

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.

			ATKORE INTERNATIONAL GROUP INC.
			(Registrant)
Date:	February 6, 2019	By:	/s/ David P. Johnson
			Vice President and Chief Financial Officer (Principal Financial Officer and Principal Accounting Officer)

33

EX-31.1

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO RULE 13a-14(a) OF THE EXCHANGE ACT, AS AMENDED,

AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, William E. Waltz , certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Atkore International Group Inc.;

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

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

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

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

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

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

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

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(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.

Dated:	February 6, 2019	/s/ William E. Waltz
		William E. Waltz
		President and Chief Executive Officer (Principal Executive Officer)

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO RULE 13a-14(a) OF THE EXCHANGE ACT, AS AMENDED,

AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, David P. Johnson, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Atkore International Group Inc.;

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

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

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

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

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

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

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

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(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.

Dated:	February 6, 2019	/s/ David P. Johnson
		David P. Johnson
		Vice President and Chief Financial Officer (Principal Financial Officer and Principal Accounting Officer)

EX-32.2

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

I, William E. Waltz, the Chief Executive Officer of Atkore International Group Inc., certify that (i) the Quarterly Report on Form 10-Q for the quarter ended December 28, 2018, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and (ii) the information contained in such Quarterly Report on Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Atkore International Group Inc.

Dated:	February 6, 2019	/s/ William E. Waltz
		William E. Waltz
		President and Chief Executive Officer (Principal Executive Officer)

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, David P. Johnson, the Chief Financial Officer of Atkore International Group Inc., certify that (i) the Quarterly Report on Form 10-Q for the quarter ended December 28, 2018, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and (ii) the information contained in such Quarterly Report on Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Atkore International Group Inc.

Dated:	February 6, 2019	/s/ David P. Johnson
		David P. Johnson
		Vice President and Chief Financial Officer (Principal Financial Officer and Principal Accounting Officer)

XML

Document and Entity Information - shares	3 Months Ended
	Dec. 28, 2018	Jan. 18, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	Atkore International Group Inc.
Entity Central Index Key	0001666138
Document Type	10-Q
Document Period End Date	Dec. 28, 2018
Document Fiscal Year Focus	2019
Amendment Flag	false
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	--09-30
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		45,980,471

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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Income Statement [Abstract]
Net sales	$ 452,028	$ 414,558
Cost of sales	341,772	317,691
Gross profit	110,256	96,867
Selling, general and administrative	56,379	51,595
Intangible asset amortization	8,214	8,687
Operating income	45,663	36,585
Interest expense, net	12,160	6,594
Other (income) expense, net	(1,600)	286
Income before income taxes	35,103	29,705
Income tax expense	8,154	2,516
Net income	$ 26,949	$ 27,189
Net income per share
Basic (in dollars per share)	$ 0.56	$ 0.43
Diluted (in dollars per share)	$ 0.54	$ 0.41

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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 26,949	$ 27,189
Other comprehensive income, net of tax:
Change in foreign currency translation adjustment	(2,746)	331
Change in unrecognized loss related to pension benefit plans	25	65
Total other comprehensive (loss) income	(2,721)	396
Comprehensive income	$ 24,228	$ 27,585

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Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Dec. 28, 2018	Sep. 30, 2018
Current Assets:
Cash and cash equivalents	$ 75,919	$ 126,662
Accounts receivable, less allowance for doubtful accounts of $2,534 and $1,762, respectively	294,181	265,147
Inventories, net	226,587	221,753
Prepaid expenses and other current assets	28,952	33,576
Total current assets	625,639	647,138
Property, plant and equipment, net	241,699	213,108
Intangible assets, net	295,203	291,916
Goodwill	178,797	170,129
Deferred tax assets	1,249	162
Other long-term assets	2,197	1,607
Total Assets	1,344,784	1,324,060
Current Liabilities:
Short-term debt and current maturities of long-term debt	26,561	26,561
Accounts payable	134,090	156,525
Income tax payable	3,931	542
Accrued compensation and employee benefits	21,197	33,350
Customer liabilities	50,127	3,377
Other current liabilities	51,642	52,392
Total current liabilities	287,548	272,747
Long-term debt	878,094	877,686
Deferred tax liabilities	23,720	16,510
Other long-term tax liabilities	907	1,443
Pension liabilities	16,500	17,075
Other long-term liabilities	13,860	16,540
Total Liabilities	1,220,629	1,202,001
Equity:
Common stock, $0.01 par value, 1,000,000,000 shares authorized, 45,980,471 and 47,079,645 shares issued and outstanding, respectively	461	472
Treasury stock, held at cost, 260,900 and 260,900 shares, respectively	(2,580)	(2,580)
Additional paid-in capital	460,264	457,978
Accumulated deficit	(314,831)	(317,373)
Accumulated other comprehensive loss	(19,159)	(16,438)
Total Equity	124,155	122,059
Total Liabilities and Equity	$ 1,344,784	$ 1,324,060

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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Dec. 28, 2018	Sep. 30, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,534	$ 1,762
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (shares)	45,980,471	47,079,645
Common stock, shares outstanding (shares)	45,980,471	47,079,645
Treasury stock (shares)	260,900	260,900

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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Operating activities:
Net income	$ 26,949	$ 27,189
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,021	17,210
Deferred income taxes	(1,306)	(5,334)
Stock-based compensation	2,982	3,564
Other adjustments to net income	2,201	1,559
Changes in operating assets and liabilities, net of effects from acquisitions
Accounts receivable	22,111	19,967
Inventories	4,263	(5,396)
Accounts payable	(30,405)	(8,311)
Other, net	(4,539)	(1,508)
Net cash provided by operating activities	40,277	48,940
Investing activities:
Capital expenditures	(6,875)	(8,235)
Acquisition of businesses, net of cash acquired	(57,899)	0
Other, net	(151)	784
Net cash used in investing activities	(64,925)	(7,451)
Financing activities:
Borrowings under credit facility	0	204,000
Repayments under credit facility	0	(247,000)
Repayments of short-term debt	0	(1,250)
Issuance of common stock	(695)	3,314
Repurchase of common stock	(24,419)	(6,681)
Other, net	(62)	(48)
Net cash used for financing activities	(25,176)	(47,665)
Effects of foreign exchange rate changes on cash and cash equivalents	(919)	219
Decrease in cash and cash equivalents	(50,743)	(5,957)
Cash and cash equivalents at beginning of period	126,662	45,718
Cash and cash equivalents at end of period	75,919	39,761
Supplementary Cash Flow information
Capital expenditures, not yet paid	$ 1,106	$ 615

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Condensed Consolidated Statement of Changes Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period (in shares) at Sep. 30, 2016		62,458
Balance at beginning of period at Sep. 30, 2016	$ 257,246	$ 626	$ (2,580)	$ 398,292	$ (113,142)	$ (25,950)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	84,639				84,639
Other comprehensive (loss) income	7,968					7,968
Stock-based compensation	12,788			12,788
Issuance of common stock (in shares)		1,628
Issuance of common stock	12,168	$ 16		12,152
Repurchase of common stock (in shares)		(781)
Repurchase of common stock	(13,938)	$ (8)			(13,930)
Balance at end of period (in shares) at Sep. 30, 2017		63,305
Balance at end of period at Sep. 30, 2017	360,871	$ 634	(2,580)	423,232	(42,433)	(17,982)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	136,645				136,645
Other comprehensive (loss) income	1,544					1,544
Stock-based compensation	14,664			14,664
Issuance of common stock (in shares)		2,795
Issuance of common stock	20,110	$ 28		20,082
Repurchase of common stock (in shares)		(19,020)
Repurchase of common stock	(411,775)	$ (190)			(411,585)
Balance at end of period (in shares) at Sep. 30, 2018		47,080
Balance at end of period at Sep. 30, 2018	122,059	$ 472	(2,580)	457,978	(317,373)	(16,438)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,949				26,949
Other comprehensive (loss) income	(2,721)					(2,721)
Stock-based compensation	2,982			2,982
Issuance of common stock (in shares)		131
Issuance of common stock	(695)	$ 1		(696)
Repurchase of common stock (in shares)		(1,230)
Repurchase of common stock	(24,419)	$ (12)			(24,407)
Balance at end of period (in shares) at Dec. 28, 2018		45,981
Balance at end of period at Dec. 28, 2018	$ 124,155	$ 461	$ (2,580)	$ 460,264	$ (314,831)	$ (19,159)

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Basis of Presentation and Summary of Significant Accounting Policies

3 Months Ended

Dec. 28, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Summary of Significant Accounting Policies

1. BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

Organization and Ownership Structure — Atkore International Group Inc. (the "Company", "Atkore" or "AIG") is a leading manufacturer of Electrical Raceway products primarily for the non-residential construction and renovation markets and Mechanical Products & Solutions ("MP&S") for the construction and industrial markets. Electrical Raceway products form the critical infrastructure that enables the deployment, isolation and protection of a structure's electrical circuitry from the original power source to the final outlet. MP&S frame, support and secure component parts in a broad range of structures, equipment and systems in electrical, industrial and construction applications.

Atkore was incorporated in the State of Delaware on November 4, 2010. Atkore is the sole stockholder of Atkore International Holdings Inc. ("AIH"), which in turn is the sole stockholder of Atkore International, Inc. ("AII").

Basis of Presentation — The accompanying unaudited condensed consolidated financial statements of the Company included herein have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). These unaudited condensed consolidated financial statements have been prepared in accordance with the Company's accounting policies and on the same basis as those financial statements included in the Company's latest Annual Report on Form 10-K for the year ended September 30, 2018 filed with the U.S. Securities and Exchange Commission (the "SEC") on November 28, 2018, and should be read in conjunction with those consolidated financial statements and the notes thereto. Certain information and disclosures normally included in the Company's annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC.

The unaudited condensed consolidated financial statements include the assets and liabilities used in operating the Company's business. All intercompany balances and transactions have been eliminated in consolidation. The results of companies acquired or disposed of are included in the unaudited condensed consolidated financial statements from the effective date of acquisition or up to the date of disposal.

These statements include all adjustments (consisting of normal recurring adjustments) that the Company considered necessary to present a fair statement of its results of operations, financial position and cash flows. The results reported in these unaudited condensed consolidated financial statements should not be regarded as necessarily indicative of results that may be expected for the entire year.

Fiscal Periods — The Company has a fiscal year that ends on September 30. It is the Company's practice to establish quarterly closings using a 4-5-4 calendar. The Company's fiscal quarters end on the last Friday in December, March and June.

Use of Estimates — The preparation of the condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclose contingent assets and liabilities at the date of the condensed consolidated financial statements and report the associated amounts of revenues and expenses. Actual results could differ materially from these estimates.

Summary of Significant Accounting Policies

Fair Value Measurements — Authoritative guidance for fair value measurements establishes a three-level hierarchy that ranks the quality and reliability of information used in developing fair value estimates. The hierarchy gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data. In cases where two or more levels of inputs are used to determine fair value, a financial instrument’s level is determined based on the lowest level input that is considered significant to the fair value measurement in its entirety. The three levels of the fair value hierarchy are summarized as follows:

Level 1—inputs are based upon quoted prices (unadjusted) in active markets for identical assets or liabilities that are accessible as of the measurement date.

Level 2—inputs are based upon quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, and model-derived valuations for the asset or liability that are derived principally from or corroborated by market data for which the primary inputs are observable, including forward interest rates, yield curves, credit risk and exchange rates.

Level 3—inputs for the valuations are unobservable and are based on management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques such as option pricing models and discounted cash flow models.

See Note 14, ''Fair Value Measurements'' for further detail.

Recent Accounting Pronouncements

A summary of recently adopted accounting guidance are as follows. Adoption dates are on the first day of the fiscal year indicated below, unless otherwise specified.

ASU	Description of ASU	Impact to Atkore	Note	Adoption Date
2014-09 Revenue from Contracts with Customers	The Accounting Standards Update ("ASU") provides guidance for revenue recognition. The update's core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under current guidance. Examples of the use of judgments and estimates may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. The update also requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The update provides for two transition methods to the new guidance: a full retrospective approach and a modified retrospective approach.	The Company adopted the guidance in the first quarter of 2019 using the modified retrospective method. See Note 2, "Revenue from Contracts with Customers for further detail."	2	2019

A summary of accounting guidance not yet adopted is as follows. Effective dates are on the first day of the fiscal year indicated below, unless otherwise specified.

ASU	Description of ASU	Impact to Atkore	Effective Date
2018-13 Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement	The ASU amends Accounting Standard Codification ("ASC") 820 to add, remove and clarify disclosure requirements related to fair value measurements.	Under evaluation.	2020
2018-07 Improvements to Nonemployee Share-Based Payment Accounting.	ASU 2018-07 simplifies the accounting for share-based payments to nonemployees by aligning it with the accounting for share-based payments to employees, with certain exceptions.	Under evaluation.	2020
ASU 2018-02 Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	The ASU provided entities with the option to reclassify tax effects stranded in accumulated other comprehensive income as a result of the "H.R.1", also known as the "Tax Cuts and Jobs Act" ("TCJA") to retained earnings.	Under evaluation.	2020
2016-02 Leases (Topic 842)	The ASU requires companies to use a "right of use" lease model that assumes that each lease creates an asset (the lessee's right to use the leased asset) and a liability (the future rent payment obligations), which should be reflected on a lessee's balance sheet to fairly represent the lease transaction and the lessee's related financial obligations with terms of more than 12 months.	The Company will adopt the new lease guidance in the first quarter of fiscal 2020. The Company has established an implementation team, deployed lease landscape surveys and is currently evaluating the impact of adoption of this ASU on its consolidated financial statements.	2020
2018-14 Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans	The ASU amends ASC 715 to add, remove and clarify disclosure requirements related to defined benefit pension and other postretirement plans.	Under evaluation.	2021

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Revenue from Contracts with Customers Revenue from Contracts with Customers

3 Months Ended

Dec. 28, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

2. REVENUE FROM CONTRACTS WITH CUSTOMERS

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, and issued subsequent amendments to the initial guidance in August 2015, March 2016, April 2016, May 2016, and December 2016 within ASU 2015-14, ASU 2016-08, ASU 2016-10 and ASU 2016-20, respectively. The core principle of this new revenue recognition guidance is that a company will recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. The new guidance defines a five-step process to implement this core principle. The new guidance also requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The new guidance provides for two transition methods, a full retrospective approach and a modified retrospective approach. The Company adopted the new guidance on October 1, 2018 utilizing the modified retrospective method of adoption for contracts not completed at the adoption date and determined there were no changes required to its reported revenues and earnings as a result of the adoption. The impacts to the financial statements consist of balance sheet reclassifications including amounts associated with the changes in the classification of reserves related to volume rebates and returns reserves. The Company has also enhanced its disclosures of revenue to comply with the new guidance. The impact to the Company’s financial statements as of December 28, 2018 was as follows:

	As of December 28, 2018
Balance Sheet	As Reported	Balances before adoption of ASC 606	Effect of Adoption Higher/(Lower)
Accounts Receivable, net	294,181	247,989	46,192
Customer liabilities	50,127	3,935	46,192

The Company’s revenue arrangements primarily consist of a single performance obligation to transfer promised goods which is satisfied at a point in time when title, risks and rewards of ownership, and subsequently control have transferred to the customer. This generally occurs when the product is shipped to the customer, with an immaterial amount of transactions in which control transfers upon delivery. The Company primarily offers assurance-type standard warranties that do not represent separate performance obligations.

The Company has certain arrangements that require it to estimate at the time of sale the amounts of variable consideration that should not be recorded as revenue as certain amounts are not expected to be collected from customers, as well as an estimate of the value of products to be returned. The Company principally relies on historical experience, specific customer agreements, and anticipated future trends to estimate these amounts at the time of sale and to reduce the transaction price. These arrangements include sales discounts and allowances, volume rebates, and returned goods.

As part of the adoption of the new revenue standard, the Company has elected to utilize certain practical expedients. The Company records amounts billed to customers for reimbursement of shipping and handling costs within revenue. Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as fulfillment costs and are included in cost of goods sold. Sales taxes and other usage-based taxes are excluded from revenue. The practical expedient not to disclose information about remaining performance obligations has also been elected as these obligations have an original duration of one year or less. The Company does not evaluate whether the selling price includes a financing interest component for contracts that are less than a year. The Company also expenses costs incurred to obtain a contract, primarily sales commissions, as all obligations will be settled in less than one year.

The Company typically receives payment 30 to 60 days from the point it has satisfied the related performance obligation. See Note 17, ''Segment Information'' for revenue disaggregated by geography and product categories.

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Acquisitions

3 Months Ended

Dec. 28, 2018

Business Combinations [Abstract]

Acquisitions

3. ACQUISITIONS

From time to time, the Company enters into strategic acquisitions in an effort to better service existing customers and to attain new customers.

On October 1, 2018, the Company acquired all of the outstanding stock of Vergokan International NV ("Vergokan") for a purchase price of $57,899, net of cash received. Vergokan is a leading manufacturer of cable tray and cable ladder systems, underfloor installations and industrial floor trunking that serves industrial, power and energy, commercial and infrastructure sectors in more than 45 countries. This transaction provides Atkore with an expanded presence in Western Europe and strengthens the Company's electrical portfolio of cable management products within the Electrical Raceway segment. The Company incurred approximately $148 for acquisition-related expenses for Vergokan which were recorded as a component of selling, general and administrative expenses for the three months ended December 28, 2018.

The purchase price was allocated to tangible and intangible assets acquired and liabilities assumed, based on their fair values. The following table summarizes the Level 3 fair values assigned to the net assets acquired and liabilities assumed as of the acquisition date:

(in thousands)	Vergokan
Fair value of consideration transferred:
Cash consideration	$	58,728
Fair value of assets acquired and liabilities assumed:
Cash	829
Accounts receivable	8,761
Inventories	11,560
Intangible assets	12,621
Fixed assets	32,490
Accounts payable	(18,669		)
Other	1,680
Net assets acquired	49,272
Excess purchase price attributed to goodwill acquired	$	9,456

The following table summarizes the fair value of intangible assets as of the acquisition date:

	Vergokan
($ in thousands)	Fair Value		Weighted Average Useful Life (Years)
Customer relationships	$	10,535	12.0
Other	2,086		9.0
Total intangible assets	$	12,621

The purchase price allocation, intangible asset values and related estimates of useful lives for Vergokan are preliminary, as the Company is finalizing its fair value estimates of intangible assets, fixed assets and working capital items.

On January 8, 2018, the Company acquired the assets of Communications Integrators, Inc. ("Cii"), a manufacturer of modular, prefabricated power, voice and data distribution systems located in Tempe, Arizona for a total purchase price, including contingent consideration, of $3,997.

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Postretirement Benefits

3 Months Ended

Dec. 28, 2018

Retirement Benefits [Abstract]

Postretirement Benefits

4. POSTRETIREMENT BENEFITS

The Company provides pension benefits through a number of noncontributory and contributory defined benefit retirement plans covering eligible U.S. employees. As of September 30, 2017, all defined pension benefit plans were frozen, whereby participants no longer accrue credited service. The net periodic benefit credit was as follows: 

		Three months ended
(in thousands)	Note	December 28, 2018			December 29, 2017
Interest cost		$	1,166		$	1,024
Expected return on plan assets		(1,593		)	(1,604		)
Amortization of actuarial loss		25			86
Net periodic benefit credit	6	$	(402	)	$	(494	)

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Restructuring Charges

3 Months Ended

Dec. 28, 2018

Restructuring and Related Activities [Abstract]

Restructuring Charges

5. RESTRUCTURING CHARGES

The liability for restructuring reserves is included within other current liabilities in the Company's condensed consolidated balance sheets as follows:

	Electrical Raceway						MP&S						Other/Corporate
(in thousands)	Severance (a)			Other (a)			Severance			Other			Severance			Total
Balance as of September 30, 2017	$	449		$	—		$	278		$	10		$	—		$	737
Charges	536			1,130			97			179			98			2,040
Utilization	(787		)	(820		)	(178		)	(160		)	(98		)	(2,043		)
Reversal	—			—			(191		)	—			—			(191		)
Exchange rate effects	14			—			(6		)	—			—			8
Balance as of September 30, 2018	212			310			—			29			—			551
Charges	285			1,102			—			—			—			1,387
Utilization	(175		)	(1,394		)	—			(29		)	—			(1,598		)
Balance as of December 28, 2018	$	322		$	18		$	—		$	—		$	—		$	340

(a) Primarily related to Atkore's commitment to close certain facilities as part of its continuing effort to realign its strategic focus. The Company recorded severance restructuring charges of $285 and $27 related to termination benefits during the three months endedDecember 28, 2018 and December 29, 2017, respectively. The Company recorded other restructuring charges to close facilities of $1,080 and $300 for the three months endedDecember 28, 2018 and December 29, 2017, respectively.

The Company expects to utilize all restructuring accruals as of December 28, 2018 within the next twelve months. The net restructuring charges included as a component of selling, general and administrative expenses in the Company's condensed consolidated statements of operations were as follows:

	Three months ended
(in thousands)	December 28, 2018		December 29, 2017
Total restructuring charges, net	$	1,387	$	262

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Other Income, Net

3 Months Ended

Dec. 28, 2018

Other Income and Expenses [Abstract]

Other Income, Net

6. OTHER INCOME, NET

Other (income) expense, net consisted of the following:

	Three months ended
(in thousands)	December 28, 2018			December 29, 2017
Undesignated foreign currency derivative instruments	(2,579		)	1,224
Foreign exchange (gain) loss on intercompany loans	1,381			(444		)
Pension-related benefits	(402		)	(494		)
Other (income) expense, net	$	(1,600	)	$	286

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Income Taxes

3 Months Ended

Dec. 28, 2018

Income Tax Disclosure [Abstract]

Income Taxes

7. INCOME TAXES

On December 22, 2017, "H.R.1," also known as the "Tax Cuts and Jobs Act" ("TCJA"), was signed into law. TCJA provides for significant changes to corporate taxation including, but not limited to, a reduction of the federal corporate tax rate from 35% to 21%, limitations on the deductibility of interest expense and executive compensation, full expensing of the costs of qualified property in the period of acquisition, the elimination of the domestic production activities deduction and a new provision designed to tax global intangible low-taxed income ("GILTI"). The legislation also adopts a new quasi-territorial tax regime and imposes a one-time transition tax on deemed repatriated earnings of certain foreign subsidiaries.

The value of the Company’s net deferred tax liability on the balance sheet decreased as a result of the enacted tax rates creating a one-time tax benefit to the Company; the preliminary analysis of the impact, using December 29, 2017 values, was an estimated decrease to the net deferred tax liability of $4,758, which was recognized in the period of enactment. The SEC Staff Accounting Bulletin No. 118 allowed for a measurement period of up to one year from the date of enactment; during the course of the fiscal year ended September 30, 2018, the Company recorded an adjustment to the re-measurement of deferred tax liabilities of an additional $708 benefit as a result of updated estimates. For the three months ended December 28, 2018, the Company finalized the re-measurement with no additional adjustments. The Company has an accumulated earnings and profit deficit in the foreign jurisdictions in which it operates. The Company has completed its calculation and does not have an income tax liability from the one-time transition tax on the deemed repatriation of its foreign earnings.

The GILTI provision of TCJA requires certain income earned by controlled foreign corporations ("CFCs") to be included currently in the gross income of the CFC's controlling U.S. shareholder. In accordance with accounting standards applicable to income taxes, there is allowed an accounting policy choice of either (1) treating taxes due on U.S. inclusions in taxable income related to GILTI as a current period expense when incurred (the “period cost method”) or (2) factoring such amounts into the Company’s measurement of its deferred taxes (the “deferred method”). The Company has elected the period method and included an estimate of the GILTI tax in the Company’s annualized effective tax rate.

For the three months ended December 28, 2018 and December 29, 2017, the Company's effective tax rate attributable to income before income taxes was 23.2% and 8.5%, respectively. For the three months ended December 28, 2018 and December 29, 2017, the Company's income tax expense was $8,154 and $2,516 respectively. The increase in the effective tax rate was primarily due to the prior year benefit of the one-time re-measurement of deferred taxes as a result of the Tax Cuts and Jobs Act, the prior year domestic manufacturing deduction, which has been repealed for the current year, and a larger excess stock compensation deduction in the period ended December 29, 2017.

The Company has recorded a valuation allowance against net operating losses in certain foreign jurisdictions. A valuation allowance is recorded when it is determined to be more likely than not that deferred tax assets will not be fully realized in the foreseeable future. The realization of deferred tax assets is dependent upon whether the Company can generate future taxable income of appropriate character in the relevant jurisdiction to utilize the assets. For the three months ended December 28, 2018, the Company has partially released a valuation allowance for $266 on deferred tax assets in its Asia Pacific business due to an increase in forecasted taxable income. The amount of the deferred tax assets considered realizable is subject to adjustment in future periods.

The Company recognizes the benefits of uncertain tax positions taken or expected to be taken in tax returns in the provision for income taxes only for those positions that it has determined are more likely than not to be realized upon examination. The Company records interest and penalties related to unrecognized tax benefits as a component of income tax expense. During the three months ended December 28, 2018, the balance of unrecognized tax benefits decreased by $536 upon the resolution of a state audit item.

For the three months ended December 28, 2018, the Company made no additional provision for U.S. or non-U.S. income taxes for unrecognized deferred tax liabilities for temporary differences related to basis differences in investments in subsidiaries, as the investments are essentially permanent in duration.

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Earnings Per Share

3 Months Ended

Dec. 28, 2018

Earnings Per Share [Abstract]

Earnings Per Share

8. EARNINGS PER SHARE

The Company calculates basic and diluted earnings per common share using the two-class method. Under the two-class method, net earnings are allocated to each class of common stock and participating securities as if all of the net earnings for the period had been distributed. The Company's participating securities consist of share-based payment awards that contain a non-forfeitable right to receive dividends and therefore are considered to participate in undistributed earnings with common stockholders.

Basic earnings per common share excludes dilution and is calculated by dividing the net earnings allocable to common stock by the weighted-average number of common stock outstanding for the period. Diluted earnings per common share is calculated by dividing net earnings allocated to common stock by the weighted-average number of shares outstanding for the period, as adjusted for the potential dilutive effect of non-participating share-based awards.

The following table sets forth the computation of basic and diluted earnings per share:

	Three months ended
(in thousands, except per share data)	December 28, 2018		December 29, 2017
Numerator:
Net income	$	26,949	$	27,189
Less: Undistributed earnings allocated to participating securities	653		217
Net income available to common shareholders	$	26,296	$	26,972
Denominator:
Basic weighted average common shares outstanding	46,995		63,316
Effect of dilutive securities: Non-participating employee stock options (1)	1,288		2,589
Diluted weighted average common shares outstanding	48,283		65,905
Basic earnings per share	$	0.56	$	0.43
Diluted earnings per share	$	0.54	$	0.41
(1) Stock options to purchase approximately 0.6 million and 0.4 million shares of common stock were outstanding during the three months ended December 28, 2018 and December 29, 2017, respectively, but were not included in the calculation of diluted earnings per share as the impact of these options would have been anti-dilutive.

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Accumulated Other Comprehensive Loss

3 Months Ended

Dec. 28, 2018

Equity [Abstract]

Accumulated Other Comprehensive Loss

9. ACCUMULATED OTHER COMPREHENSIVE LOSS

The following table presents the changes in accumulated other comprehensive loss by component, net of tax:

(in thousands)	Defined benefit pension items			Currency translation adjustments			Total
Balance as of September 30, 2018	$	(6,048	)	$	(10,390	)	$	(16,438	)
Other comprehensive income before reclassifications	—			(2,746		)	(2,746		)
Amounts reclassified from accumulated other comprehensive loss	25			—			25
Net current period other comprehensive (loss) income	25			(2,746		)	(2,721		)
Balance as of December 28, 2018	$	(6,023	)	$	(13,136	)	$	(19,159	)

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Inventories, Net

3 Months Ended

Dec. 28, 2018

Inventory Disclosure [Abstract]

Inventories, Net

10. INVENTORIES, NET

A majority of the Company's inventories are recorded at the lower of cost (primarily last in, first out, or "LIFO") or market. Approximately 75% and 80% of the Company's inventories were valued at the lower of LIFO cost or market at December 28, 2018 and September 30, 2018, respectively. Interim LIFO determinations, including those at December 28, 2018, are based on management's estimates of future inventory levels and costs for the remainder of the current fiscal year.

(in thousands)	December 28, 2018		September 30, 2018
Purchased materials and manufactured parts, net	$	61,342	$	58,572
Work in process, net	21,843		21,769
Finished goods, net	143,402		141,412
Inventories, net	$	226,587	$	221,753

Total inventories would be $21,982 and $26,340 higher than reported as of December 28, 2018 and September 30, 2018, respectively, if the first-in, first-out method was used for all inventories. As of December 28, 2018 and September 30, 2018, the excess and obsolete inventory reserve was $15,046 and $12,909, respectively.

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Property, Plant and Equipment

3 Months Ended

Dec. 28, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

11. PROPERTY, PLANT AND EQUIPMENT

As of December 28, 2018 and September 30, 2018, property, plant and equipment at cost and accumulated depreciation were as follows:

(in thousands)	December 28, 2018			September 30, 2018
Land	$	19,939		$	13,295
Buildings and related improvements	121,017			108,758
Machinery and equipment	286,355			262,078
Leasehold improvements	7,835			7,382
Software	24,105			30,502
Construction in progress	17,234			16,777
Property, plant and equipment	476,485			438,792
Accumulated depreciation	(234,786		)	(225,684		)
Property, plant and equipment, net	$	241,699		$	213,108

Depreciation expense for the three months ended December 28, 2018 and December 29, 2017 totaled $9,807 and $8,523, respectively.

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Goodwill and Intangible Assets

3 Months Ended

Dec. 28, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

12. GOODWILL AND INTANGIBLE ASSETS

Changes in the carrying amount of goodwill are as follows:

(in thousands)	Electrical Raceway			Mechanical Products & Solutions		Total
Balance as of October 1, 2018	$	133,566		$	36,563	$	170,129
Goodwill acquired during year	9,456			—		9,456
Exchange rate effects	(788		)	—		(788		)
Balance as of December 28, 2018	$	142,234		$	36,563	$	178,797

Goodwill balances as of October 1, 2018 and December 28, 2018 include $3,924 and $43,000 of accumulated impairment losses within the Electrical Raceway and MP&S segments, respectively.

The Company assesses the recoverability of goodwill and indefinite-lived trade names on an annual basis in accordance with ASC 350, "Intangibles - Goodwill and Other." The measurement date is the first day of the fourth fiscal quarter, or more frequently, if events or circumstances indicate that it is more likely than not that the fair value of a reporting unit or the respective indefinite-lived trade name is less than the carrying value.

The following table provides the gross carrying value, accumulated amortization and net carrying value for each major class of intangible assets:

		December 28, 2018							September 30, 2018
($ in thousands)	Weighted Average Useful Life (Years)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Amortizable intangible assets:
Customer relationships	10	$	339,581	$	(148,773	)	$	190,808	$	330,295	$	(141,401	)	$	188,894
Other	8	18,086		(6,571		)	11,515		16,003		(5,861		)	10,142
Total		357,667		(155,344		)	202,323		346,298		(147,262		)	199,036
Indefinite-lived intangible assets:
Trade names		92,880		—			92,880		92,880		—			92,880
Total		$	450,547	$	(155,344	)	$	295,203	$	439,178	$	(147,262	)	$	291,916

Other intangible assets consist of definite-lived trade names, technology, non-compete agreements and backlogs. Amortization expense for the three months ended December 28, 2018 and December 29, 2017 was $8,214 and $8,687, respectively. Expected amortization expense for intangible assets for the remainder of fiscal 2019 and over the next five years and thereafter is as follows:

(in thousands)
Remaining 2019	$	26,106
2020	30,310
2021	30,176
2022	28,843
2023	28,791
2024	24,094
Thereafter	34,003

Actual amounts of amortization may differ from estimated amounts due to additional intangible asset acquisitions, impairment of intangible assets and other events.

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Debt

3 Months Ended

Dec. 28, 2018

Debt Disclosure [Abstract]

Debt

13. DEBT

Debt as of December 28, 2018 and September 30, 2018 was as follows:

(in thousands)	December 28, 2018			September 30, 2018
First Lien Term Loan Facility due December 22, 2023	$	912,207		$	912,162
Deferred financing costs	(7,788		)	(8,194		)
Other	236			279
Total debt	$	904,655		$	904,247
Less: Current portion	26,561			26,561
Long-term debt	$	878,094		$	877,686

The asset-based credit facility (the "ABL Credit Facility") has aggregate commitments of $325,000 and is guaranteed by AIH and the U.S. operating companies owned by AII. AII's availability under the ABL Credit Facility was $274,954 and $315,119 as of December 28, 2018 and September 30, 2018, respectively.

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Fair Value Measurements

3 Months Ended

Dec. 28, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

14. FAIR VALUE MEASUREMENTS

Certain assets and liabilities are required to be recorded at fair value on a recurring basis.

The Company uses forward currency contracts to hedge the effects of foreign exchange relating to certain of the Company’s intercompany receivables denominated in a foreign currency. These derivative instruments are not formally designated as hedges by the Company and the terms of these instruments range from six months to five years. Short-term forward currency contracts are recorded in other current liabilities and long-term forward currency contracts are recorded in other long-term liabilities in the condensed consolidated balance sheet. The fair value gains and losses are included in other (income) expense, net within the condensed consolidated statements of operations. See Note 6, ''Other Income, net'' for further detail.

The total notional amount of undesignated forward currency contracts were £46.4 million and £49.1 million as of December 28, 2018 and September 30, 2018, respectively. Cash flows associated with derivative financial instruments are recognized in the operating section of the condensed consolidated statements of cash flows. The fair value of forward currency contracts is calculated by reference to current forward exchange rates for contracts with similar maturity profiles.

The following table presents the Company's assets and liabilities measured at fair value:

	December 28, 2018						September 30, 2018
(in thousands)	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Assets
Cash equivalents	$	38,771	$	—	$	—	$	28,175	$	—	$	—
Forward currency contracts	—		727		—		—		—		—
Liabilities
Forward currency contracts	—		68		—		—		1,857		—

In addition to the recurring assets and liabilities measured at fair value, the Company has a contingent consideration liability of $550 measured at fair value related to the Cii acquisition, which was settled in January 2019. The liability is valued using significant unobservable inputs (Level 3) based on the probability of achievement of first year earnings post acquisition.

The Company's remaining financial instruments consist primarily of cash, accounts receivable and accounts payable whose carrying value approximate their fair value due to their short-term nature.

The estimated fair value of financial instruments not carried at fair value in the condensed consolidated balance sheets were as follows:

	December 28, 2018				September 30, 2018
(in thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
First Lien Term Loan Facility due December 22, 2023	$	913,100	$	862,880	$	913,100	$	916,113

In determining the approximate fair value of its long-term debt, the Company used the trading values among financial institutions, which were classified within Level 2 of the fair value hierarchy. The carrying value of the ABL Credit Facility approximates fair value due to it being a market-linked variable rate debt.

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Commitments and Contingencies

3 Months Ended

Dec. 28, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

15. COMMITMENTS AND CONTINGENCIES

The Company has obligations related to commitments to purchase certain goods. As of December 28, 2018, such obligations were $197,115 for the rest of fiscal year 2019 and $801 for fiscal year 2020. These amounts represent open purchase orders for materials used in production.

Legal Contingencies — The Company is a defendant in a number of pending legal proceedings, some of which were inherited from its former parent, Tyco International Ltd. ("Tyco"), including certain product liability claims. Several lawsuits have been filed against the Company and the Company has also received other claim demand letters alleging that the Company's anti-microbial coated steel sprinkler pipe, which the Company has not manufactured or sold for several years, is incompatible with chlorinated polyvinyl chloride and caused stress cracking in such pipe manufactured by third parties when installed together in the same sprinkler system, which the Company refers to collectively as the "Special Products Claims." After an analysis of claims experience, the Company reserved its best estimate of the probable and reasonably estimable losses related to these matters. The Company's total product liability reserves for Special Products Claims and other product liability matters were $1,235 and $6,755 as of December 28, 2018 and September 30, 2018, respectively. As of December 28, 2018, the Company believes that the range of losses for Special Products Claims and other product liabilities is between $1,000 and $9,000.

During the quarter ended December 28, 2018, Tyco and the Company agreed with a plaintiff to settle one Special Products Claim that was to go to trial.  The Company agreed to fund the total settlement in exchange for Tyco's agreement to cap the Company's Special Products Claim deductible at $12,000, as opposed to the $13,000 cap negotiated within the original indemnity agreement. Tyco and the Company are examining the Company's total Special Products Claim payments which are nearly $12,000 with the aforementioned settlement payment and as of December 28, 2018, the Company believes that it has recorded $12,000 of cumulative expense related to these Special Products Claims.  From and after the point where the Company has spent $12,000 on Special Products Claims, Tyco, now Johnson Controls International plc, has a contractual obligation to indemnify the Company in respect of claims of incompatibility between the Company's antimicrobial coated steel sprinkler pipe and CPVC pipe used in the same sprinkler system.

At this time, the Company does not expect the outcome of the Special Products Claims proceedings, either individually or in the aggregate, to have a material adverse effect on its business, financial condition, results of operations or cash flows, and the Company believes that its reserves are adequate for all remaining contingencies for Special Products Claims.

In addition to the matters discussed above, from time to time, the Company is subject to a number of disputes, administrative proceedings and other claims arising out of the ordinary conduct of the Company's business. These matters generally relate to disputes arising out of the use or installation of the Company's products, product liability litigation, contract disputes, patent infringement accusations, employment matters, personal injury claims and similar matters. On the basis of information currently available to the Company, it does not believe that existing proceedings and claims will have a material adverse effect on its business, financial condition, results of operations or cash flows. However, litigation is unpredictable, and the Company could incur judgments or enter into settlements for current or future claims that could adversely affect its business, financial condition, results of operations or cash flows.

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Guarantees

3 Months Ended

Dec. 28, 2018

Guarantees [Abstract]

Guarantees

16. GUARANTEES

The Company had outstanding letters of credit totaling $10,979 supporting workers' compensation and general liability insurance policies as of December 28, 2018. The Company also had surety bonds primarily related to performance guarantees on supply agreements and construction contracts, and payment of duties and taxes totaling $25,199 as of December 28, 2018.

In disposing of assets or businesses, the Company often provides representations, warranties and indemnities to cover various risks including unknown damage to the assets, environmental risks involved in the sale of real estate, liability to investigate and remediate environmental contamination at waste disposal sites and manufacturing facilities, and unidentified tax liabilities and legal fees related to periods prior to disposition. The Company does not have the ability to estimate the potential liability from such indemnities because they relate to unknown conditions. However, the Company has no reason to believe that these uncertainties would have a material adverse effect on the Company's business, financial condition, results of operations or cash flows.

In the normal course of business, the Company is liable for product performance and contract completion. In the opinion of management, such obligations will not have a material adverse effect on the Company's business, financial condition, results of operations or cash flows.

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Segment Information

3 Months Ended

Dec. 28, 2018

Segment Reporting [Abstract]

Segment Information

17. SEGMENT INFORMATION

The Company has two operating segments, which are also its reportable segments. The Company's operating segments are organized based upon primary market channels and, in most instances, the end use of products.

Through its Electrical Raceway segment, the Company manufactures products that deploy, isolate and protect a structure's electrical circuitry from the original power source to the final outlet. These products, which include electrical conduit, armored cable, cable trays, mounting systems and fittings, are critical components of the electrical infrastructure for maintenance, repair and remodel markets. The vast majority of the Company's Electrical Raceway net sales are made to electrical distributors, who then serve electrical contractors and the Company considers both to be customers.

Through the MP&S segment, the Company provides products and services that frame, support and secure component parts in a broad range of structures, equipment and systems in electrical, industrial and construction applications. The Company's principal products in this segment are metal framing products and in-line galvanized mechanical tube. Through its metal framing business, the Company designs, manufactures and installs metal strut and fittings used to assemble mounting structures that support heavy equipment and electrical content in buildings and other structures.

Both segments use Adjusted EBITDA as the primary measure of profit and loss. Segment Adjusted EBITDA is the sum of income (loss) from operations before income taxes, adjusted to exclude unallocated expenses, depreciation and amortization, interest expense, net, gain (loss) on extinguishment of debt, restructuring and impairments, stock-based compensation, certain legal matters, transaction costs, gain on sale of joint venture and other items, such as inventory reserves and adjustments, release of indemnified uncertain tax positions, and the impact of foreign exchange gains or losses.

Intersegment transactions primarily consist of product sales at designated transfer prices on an arm's-length basis. Gross profit earned and reported within the segment is eliminated in the Company's consolidated results. Certain manufacturing and distribution expenses are allocated between the segments on a pro rata basis due to the shared nature of activities. Recorded amounts represent a proportional amount of the quantity of product produced for each segment. Certain assets, such as machinery and equipment and facilities, are not allocated to each segment despite serving both segments. These shared assets are reported within the MP&S segment. We allocate certain corporate operating expenses that directly benefit our operating segments, such as insurance and information technology, on a basis that reasonably approximates an estimate of the use of these services.

	Three months ended
	December 28, 2018							December 29, 2017
(in thousands)	External Net Sales		Intersegment Sales			Adjusted EBITDA		External Net Sales		Intersegment Sales			Adjusted EBITDA
Electrical Raceway	$	343,215	$	191		$	68,489	$	316,005	$	518		$	56,160
MP&S	108,813		—			$	10,887	98,553		21			$	10,809
Eliminations	—		(191		)			—		(539		)
Consolidated operations	$	452,028	$	—				$	414,558	$	—

Presented below is a reconciliation of operating segment Adjusted EBITDA to Income before income taxes:

	Three months ended
(in thousands)	December 28, 2018			December 29, 2017
Operating segment Adjusted EBITDA
Electrical Raceway	$	68,489		$	56,160
MP&S	10,887			10,809
Total	79,376			66,969
Unallocated expenses (a)	(9,353		)	(8,482		)
Depreciation and amortization	(18,021		)	(17,210		)
Interest expense, net	(12,160		)	(6,594		)
Restructuring and impairments	(1,387		)	(262		)
Stock-based compensation	(2,982		)	(3,564		)
Transaction costs	(164		)	(645		)
Other (b)	(206		)	(507		)
Income before income taxes	$	35,103		$	29,705

(a) Represents unallocated selling, general and administrative activities and associated expenses including, in part, executive, legal, finance, human resources, information technology, business development and communications, as well as certain costs and earnings of employee-related benefits plans, such as stock-based compensation and a portion of self-insured medical costs.

(b) Represents other items, such as inventory reserves and adjustments, release of indemnified uncertain tax positions and the impact of foreign exchange gains or losses.

The Company's net sales by geography were as follows for the three months endedDecember 28, 2018 and December 29, 2017:

	Three months ended
(in thousands)	December 28, 2018		December 29, 2017
United States	$	395,628	$	373,828
Other Americas	9,232		8,001
Europe	33,862		20,300
Asia-Pacific	13,306		12,429
Total	$	452,028	$	414,558

The table below shows the amount of net sales from external customers for each of the Company's product categories which accounted for 10% or more of consolidated net sales in either period for the three months endedDecember 28, 2018 and December 29, 2017:

(in thousands)	December 28, 2018		December 29, 2017
Metal Electrical Conduit and Fittings	$	131,247	$	108,263
Armored Cable and Fittings	84,345		86,215
PVC Electrical Conduit and Fittings	68,233		76,225
Cable Tray and Cable Ladders	45,774		34,116
Other raceway products	13,616		11,186
Electrical Raceway	343,215		316,005
Mechanical Pipe	60,668		50,645
Metal Framing and Fittings	28,611		24,902
Other MP&S products	19,534		18,150
Impact of Fence and Sprinkler	—		4,856
MP&S	108,813		98,553
Net sales	$	452,028	$	414,558

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Basis of Presentation and Summary of Significant Accounting Policies (Policies)

3 Months Ended

Dec. 28, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation — The accompanying unaudited condensed consolidated financial statements of the Company included herein have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). These unaudited condensed consolidated financial statements have been prepared in accordance with the Company's accounting policies and on the same basis as those financial statements included in the Company's latest Annual Report on Form 10-K for the year ended September 30, 2018 filed with the U.S. Securities and Exchange Commission (the "SEC") on November 28, 2018, and should be read in conjunction with those consolidated financial statements and the notes thereto. Certain information and disclosures normally included in the Company's annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC.

The unaudited condensed consolidated financial statements include the assets and liabilities used in operating the Company's business. All intercompany balances and transactions have been eliminated in consolidation. The results of companies acquired or disposed of are included in the unaudited condensed consolidated financial statements from the effective date of acquisition or up to the date of disposal.

These statements include all adjustments (consisting of normal recurring adjustments) that the Company considered necessary to present a fair statement of its results of operations, financial position and cash flows. The results reported in these unaudited condensed consolidated financial statements should not be regarded as necessarily indicative of results that may be expected for the entire year.

Fiscal Periods

Fiscal Periods — The Company has a fiscal year that ends on September 30. It is the Company's practice to establish quarterly closings using a 4-5-4 calendar. The Company's fiscal quarters end on the last Friday in December, March and June.

Use of Estimates

Use of Estimates — The preparation of the condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclose contingent assets and liabilities at the date of the condensed consolidated financial statements and report the associated amounts of revenues and expenses. Actual results could differ materially from these estimates.

Fair Value Measurements

Fair Value Measurements — Authoritative guidance for fair value measurements establishes a three-level hierarchy that ranks the quality and reliability of information used in developing fair value estimates. The hierarchy gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data. In cases where two or more levels of inputs are used to determine fair value, a financial instrument’s level is determined based on the lowest level input that is considered significant to the fair value measurement in its entirety. The three levels of the fair value hierarchy are summarized as follows:

Level 1—inputs are based upon quoted prices (unadjusted) in active markets for identical assets or liabilities that are accessible as of the measurement date.

Level 2—inputs are based upon quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, and model-derived valuations for the asset or liability that are derived principally from or corroborated by market data for which the primary inputs are observable, including forward interest rates, yield curves, credit risk and exchange rates.

Level 3—inputs for the valuations are unobservable and are based on management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques such as option pricing models and discounted cash flow models.

See Note 14, ''Fair Value Measurements'' for further detail.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

A summary of recently adopted accounting guidance are as follows. Adoption dates are on the first day of the fiscal year indicated below, unless otherwise specified.

ASU	Description of ASU	Impact to Atkore	Note	Adoption Date
2014-09 Revenue from Contracts with Customers	The Accounting Standards Update ("ASU") provides guidance for revenue recognition. The update's core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under current guidance. Examples of the use of judgments and estimates may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. The update also requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The update provides for two transition methods to the new guidance: a full retrospective approach and a modified retrospective approach.	The Company adopted the guidance in the first quarter of 2019 using the modified retrospective method. See Note 2, "Revenue from Contracts with Customers for further detail."	2	2019

A summary of accounting guidance not yet adopted is as follows. Effective dates are on the first day of the fiscal year indicated below, unless otherwise specified.

ASU	Description of ASU	Impact to Atkore	Effective Date
2018-13 Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement	The ASU amends Accounting Standard Codification ("ASC") 820 to add, remove and clarify disclosure requirements related to fair value measurements.	Under evaluation.	2020
2018-07 Improvements to Nonemployee Share-Based Payment Accounting.	ASU 2018-07 simplifies the accounting for share-based payments to nonemployees by aligning it with the accounting for share-based payments to employees, with certain exceptions.	Under evaluation.	2020
ASU 2018-02 Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	The ASU provided entities with the option to reclassify tax effects stranded in accumulated other comprehensive income as a result of the "H.R.1", also known as the "Tax Cuts and Jobs Act" ("TCJA") to retained earnings.	Under evaluation.	2020
2016-02 Leases (Topic 842)	The ASU requires companies to use a "right of use" lease model that assumes that each lease creates an asset (the lessee's right to use the leased asset) and a liability (the future rent payment obligations), which should be reflected on a lessee's balance sheet to fairly represent the lease transaction and the lessee's related financial obligations with terms of more than 12 months.	The Company will adopt the new lease guidance in the first quarter of fiscal 2020. The Company has established an implementation team, deployed lease landscape surveys and is currently evaluating the impact of adoption of this ASU on its consolidated financial statements.	2020
2018-14 Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans	The ASU amends ASC 715 to add, remove and clarify disclosure requirements related to defined benefit pension and other postretirement plans.	Under evaluation.	2021

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Basis of Presentation and Summary of Significant Accounting Policies (Tables)

3 Months Ended

Dec. 28, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

A summary of recently adopted accounting guidance are as follows. Adoption dates are on the first day of the fiscal year indicated below, unless otherwise specified.

ASU	Description of ASU	Impact to Atkore	Note	Adoption Date
2014-09 Revenue from Contracts with Customers	The Accounting Standards Update ("ASU") provides guidance for revenue recognition. The update's core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under current guidance. Examples of the use of judgments and estimates may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. The update also requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The update provides for two transition methods to the new guidance: a full retrospective approach and a modified retrospective approach.	The Company adopted the guidance in the first quarter of 2019 using the modified retrospective method. See Note 2, "Revenue from Contracts with Customers for further detail."	2	2019

A summary of accounting guidance not yet adopted is as follows. Effective dates are on the first day of the fiscal year indicated below, unless otherwise specified.

ASU	Description of ASU	Impact to Atkore	Effective Date
2018-13 Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement	The ASU amends Accounting Standard Codification ("ASC") 820 to add, remove and clarify disclosure requirements related to fair value measurements.	Under evaluation.	2020
2018-07 Improvements to Nonemployee Share-Based Payment Accounting.	ASU 2018-07 simplifies the accounting for share-based payments to nonemployees by aligning it with the accounting for share-based payments to employees, with certain exceptions.	Under evaluation.	2020
ASU 2018-02 Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	The ASU provided entities with the option to reclassify tax effects stranded in accumulated other comprehensive income as a result of the "H.R.1", also known as the "Tax Cuts and Jobs Act" ("TCJA") to retained earnings.	Under evaluation.	2020
2016-02 Leases (Topic 842)	The ASU requires companies to use a "right of use" lease model that assumes that each lease creates an asset (the lessee's right to use the leased asset) and a liability (the future rent payment obligations), which should be reflected on a lessee's balance sheet to fairly represent the lease transaction and the lessee's related financial obligations with terms of more than 12 months.	The Company will adopt the new lease guidance in the first quarter of fiscal 2020. The Company has established an implementation team, deployed lease landscape surveys and is currently evaluating the impact of adoption of this ASU on its consolidated financial statements.	2020
2018-14 Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans	The ASU amends ASC 715 to add, remove and clarify disclosure requirements related to defined benefit pension and other postretirement plans.	Under evaluation.	2021

The impact to the Company’s financial statements as of December 28, 2018 was as follows:

	As of December 28, 2018
Balance Sheet	As Reported	Balances before adoption of ASC 606	Effect of Adoption Higher/(Lower)
Accounts Receivable, net	294,181	247,989	46,192
Customer liabilities	50,127	3,935	46,192

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Revenue from Contracts with Customers (Tables)

3 Months Ended

Dec. 28, 2018

Revenue from Contract with Customer [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

A summary of recently adopted accounting guidance are as follows. Adoption dates are on the first day of the fiscal year indicated below, unless otherwise specified.

ASU	Description of ASU	Impact to Atkore	Note	Adoption Date
2014-09 Revenue from Contracts with Customers	The Accounting Standards Update ("ASU") provides guidance for revenue recognition. The update's core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under current guidance. Examples of the use of judgments and estimates may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. The update also requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The update provides for two transition methods to the new guidance: a full retrospective approach and a modified retrospective approach.	The Company adopted the guidance in the first quarter of 2019 using the modified retrospective method. See Note 2, "Revenue from Contracts with Customers for further detail."	2	2019

A summary of accounting guidance not yet adopted is as follows. Effective dates are on the first day of the fiscal year indicated below, unless otherwise specified.

ASU	Description of ASU	Impact to Atkore	Effective Date
2018-13 Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement	The ASU amends Accounting Standard Codification ("ASC") 820 to add, remove and clarify disclosure requirements related to fair value measurements.	Under evaluation.	2020
2018-07 Improvements to Nonemployee Share-Based Payment Accounting.	ASU 2018-07 simplifies the accounting for share-based payments to nonemployees by aligning it with the accounting for share-based payments to employees, with certain exceptions.	Under evaluation.	2020
ASU 2018-02 Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	The ASU provided entities with the option to reclassify tax effects stranded in accumulated other comprehensive income as a result of the "H.R.1", also known as the "Tax Cuts and Jobs Act" ("TCJA") to retained earnings.	Under evaluation.	2020
2016-02 Leases (Topic 842)	The ASU requires companies to use a "right of use" lease model that assumes that each lease creates an asset (the lessee's right to use the leased asset) and a liability (the future rent payment obligations), which should be reflected on a lessee's balance sheet to fairly represent the lease transaction and the lessee's related financial obligations with terms of more than 12 months.	The Company will adopt the new lease guidance in the first quarter of fiscal 2020. The Company has established an implementation team, deployed lease landscape surveys and is currently evaluating the impact of adoption of this ASU on its consolidated financial statements.	2020
2018-14 Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans	The ASU amends ASC 715 to add, remove and clarify disclosure requirements related to defined benefit pension and other postretirement plans.	Under evaluation.	2021

The impact to the Company’s financial statements as of December 28, 2018 was as follows:

	As of December 28, 2018
Balance Sheet	As Reported	Balances before adoption of ASC 606	Effect of Adoption Higher/(Lower)
Accounts Receivable, net	294,181	247,989	46,192
Customer liabilities	50,127	3,935	46,192

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Acquisitions (Tables)

3 Months Ended

Dec. 28, 2018

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

(in thousands)	Vergokan
Fair value of consideration transferred:
Cash consideration	$	58,728
Fair value of assets acquired and liabilities assumed:
Cash	829
Accounts receivable	8,761
Inventories	11,560
Intangible assets	12,621
Fixed assets	32,490
Accounts payable	(18,669		)
Other	1,680
Net assets acquired	49,272
Excess purchase price attributed to goodwill acquired	$	9,456

Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination

The following table summarizes the fair value of intangible assets as of the acquisition date:

	Vergokan
($ in thousands)	Fair Value		Weighted Average Useful Life (Years)
Customer relationships	$	10,535	12.0
Other	2,086		9.0
Total intangible assets	$	12,621

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Postretirement Benefits (Tables)

3 Months Ended

Dec. 28, 2018

Retirement Benefits [Abstract]

Schedule of Net Periodic Benefit Cost

The net periodic benefit credit was as follows: 

		Three months ended
(in thousands)	Note	December 28, 2018			December 29, 2017
Interest cost		$	1,166		$	1,024
Expected return on plan assets		(1,593		)	(1,604		)
Amortization of actuarial loss		25			86
Net periodic benefit credit	6	$	(402	)	$	(494	)

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Restructuring Charges (Tables)

3 Months Ended

Dec. 28, 2018

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Reserves

The liability for restructuring reserves is included within other current liabilities in the Company's condensed consolidated balance sheets as follows:

	Electrical Raceway						MP&S						Other/Corporate
(in thousands)	Severance (a)			Other (a)			Severance			Other			Severance			Total
Balance as of September 30, 2017	$	449		$	—		$	278		$	10		$	—		$	737
Charges	536			1,130			97			179			98			2,040
Utilization	(787		)	(820		)	(178		)	(160		)	(98		)	(2,043		)
Reversal	—			—			(191		)	—			—			(191		)
Exchange rate effects	14			—			(6		)	—			—			8
Balance as of September 30, 2018	212			310			—			29			—			551
Charges	285			1,102			—			—			—			1,387
Utilization	(175		)	(1,394		)	—			(29		)	—			(1,598		)
Balance as of December 28, 2018	$	322		$	18		$	—		$	—		$	—		$	340

(a) Primarily related to Atkore's commitment to close certain facilities as part of its continuing effort to realign its strategic focus. The Company recorded severance restructuring charges of $285 and $27 related to termination benefits during the three months endedDecember 28, 2018 and December 29, 2017, respectively. The Company recorded other restructuring charges to close facilities of $1,080 and $300 for the three months endedDecember 28, 2018 and December 29, 2017, respectively.

Restructuring and Related Costs

The net restructuring charges included as a component of selling, general and administrative expenses in the Company's condensed consolidated statements of operations were as follows:

	Three months ended
(in thousands)	December 28, 2018		December 29, 2017
Total restructuring charges, net	$	1,387	$	262

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Other Income, Net (Tables)

3 Months Ended

Dec. 28, 2018

Other Income and Expenses [Abstract]

Schedule of Other Expense, Net

Other (income) expense, net consisted of the following:

	Three months ended
(in thousands)	December 28, 2018			December 29, 2017
Undesignated foreign currency derivative instruments	(2,579		)	1,224
Foreign exchange (gain) loss on intercompany loans	1,381			(444		)
Pension-related benefits	(402		)	(494		)
Other (income) expense, net	$	(1,600	)	$	286

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Earnings Per Share (Tables)

3 Months Ended

Dec. 28, 2018

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Net Income Per Share

The following table sets forth the computation of basic and diluted earnings per share:

	Three months ended
(in thousands, except per share data)	December 28, 2018		December 29, 2017
Numerator:
Net income	$	26,949	$	27,189
Less: Undistributed earnings allocated to participating securities	653		217
Net income available to common shareholders	$	26,296	$	26,972
Denominator:
Basic weighted average common shares outstanding	46,995		63,316
Effect of dilutive securities: Non-participating employee stock options (1)	1,288		2,589
Diluted weighted average common shares outstanding	48,283		65,905
Basic earnings per share	$	0.56	$	0.43
Diluted earnings per share	$	0.54	$	0.41
(1) Stock options to purchase approximately 0.6 million and 0.4 million shares of common stock were outstanding during the three months ended December 28, 2018 and December 29, 2017, respectively, but were not included in the calculation of diluted earnings per share as the impact of these options would have been anti-dilutive.

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Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Dec. 28, 2018

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Loss

The following table presents the changes in accumulated other comprehensive loss by component, net of tax:

(in thousands)	Defined benefit pension items			Currency translation adjustments			Total
Balance as of September 30, 2018	$	(6,048	)	$	(10,390	)	$	(16,438	)
Other comprehensive income before reclassifications	—			(2,746		)	(2,746		)
Amounts reclassified from accumulated other comprehensive loss	25			—			25
Net current period other comprehensive (loss) income	25			(2,746		)	(2,721		)
Balance as of December 28, 2018	$	(6,023	)	$	(13,136	)	$	(19,159	)

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Inventories, Net (Tables)

3 Months Ended

Dec. 28, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory, Current

Interim LIFO determinations, including those at December 28, 2018, are based on management's estimates of future inventory levels and costs for the remainder of the current fiscal year.

(in thousands)	December 28, 2018		September 30, 2018
Purchased materials and manufactured parts, net	$	61,342	$	58,572
Work in process, net	21,843		21,769
Finished goods, net	143,402		141,412
Inventories, net	$	226,587	$	221,753

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Property, Plant and Equipment (Tables)

3 Months Ended

Dec. 28, 2018

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

As of December 28, 2018 and September 30, 2018, property, plant and equipment at cost and accumulated depreciation were as follows:

(in thousands)	December 28, 2018			September 30, 2018
Land	$	19,939		$	13,295
Buildings and related improvements	121,017			108,758
Machinery and equipment	286,355			262,078
Leasehold improvements	7,835			7,382
Software	24,105			30,502
Construction in progress	17,234			16,777
Property, plant and equipment	476,485			438,792
Accumulated depreciation	(234,786		)	(225,684		)
Property, plant and equipment, net	$	241,699		$	213,108

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Goodwill and Intangible Assets (Tables)

3 Months Ended

Dec. 28, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Changes in the carrying amount of goodwill are as follows:

(in thousands)	Electrical Raceway			Mechanical Products & Solutions		Total
Balance as of October 1, 2018	$	133,566		$	36,563	$	170,129
Goodwill acquired during year	9,456			—		9,456
Exchange rate effects	(788		)	—		(788		)
Balance as of December 28, 2018	$	142,234		$	36,563	$	178,797

Schedule of Finite-Lived Intangible Assets

The following table provides the gross carrying value, accumulated amortization and net carrying value for each major class of intangible assets:

		December 28, 2018							September 30, 2018
($ in thousands)	Weighted Average Useful Life (Years)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Amortizable intangible assets:
Customer relationships	10	$	339,581	$	(148,773	)	$	190,808	$	330,295	$	(141,401	)	$	188,894
Other	8	18,086		(6,571		)	11,515		16,003		(5,861		)	10,142
Total		357,667		(155,344		)	202,323		346,298		(147,262		)	199,036
Indefinite-lived intangible assets:
Trade names		92,880		—			92,880		92,880		—			92,880
Total		$	450,547	$	(155,344	)	$	295,203	$	439,178	$	(147,262	)	$	291,916

Schedule of Indefinite-Lived Intangible Assets

The following table provides the gross carrying value, accumulated amortization and net carrying value for each major class of intangible assets:

		December 28, 2018							September 30, 2018
($ in thousands)	Weighted Average Useful Life (Years)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Amortizable intangible assets:
Customer relationships	10	$	339,581	$	(148,773	)	$	190,808	$	330,295	$	(141,401	)	$	188,894
Other	8	18,086		(6,571		)	11,515		16,003		(5,861		)	10,142
Total		357,667		(155,344		)	202,323		346,298		(147,262		)	199,036
Indefinite-lived intangible assets:
Trade names		92,880		—			92,880		92,880		—			92,880
Total		$	450,547	$	(155,344	)	$	295,203	$	439,178	$	(147,262	)	$	291,916

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Expected amortization expense for intangible assets for the remainder of fiscal 2019 and over the next five years and thereafter is as follows:

(in thousands)
Remaining 2019	$	26,106
2020	30,310
2021	30,176
2022	28,843
2023	28,791
2024	24,094
Thereafter	34,003

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Debt (Tables)

3 Months Ended

Dec. 28, 2018

Debt Disclosure [Abstract]

Schedule of Debt

Debt as of December 28, 2018 and September 30, 2018 was as follows:

(in thousands)	December 28, 2018			September 30, 2018
First Lien Term Loan Facility due December 22, 2023	$	912,207		$	912,162
Deferred financing costs	(7,788		)	(8,194		)
Other	236			279
Total debt	$	904,655		$	904,247
Less: Current portion	26,561			26,561
Long-term debt	$	878,094		$	877,686

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Fair Value Measurements (Tables)

3 Months Ended

Dec. 28, 2018

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities

The following table presents the Company's assets and liabilities measured at fair value:

	December 28, 2018						September 30, 2018
(in thousands)	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Assets
Cash equivalents	$	38,771	$	—	$	—	$	28,175	$	—	$	—
Forward currency contracts	—		727		—		—		—		—
Liabilities
Forward currency contracts	—		68		—		—		1,857		—

Estimated Fair Value of Financial Instruments Not Carried at Fair Value

The estimated fair value of financial instruments not carried at fair value in the condensed consolidated balance sheets were as follows:

	December 28, 2018				September 30, 2018
(in thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
First Lien Term Loan Facility due December 22, 2023	$	913,100	$	862,880	$	913,100	$	916,113

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Segment Information (Tables)

3 Months Ended

Dec. 28, 2018

Segment Reporting [Abstract]

Schedule of Segment Information

Presented below is a reconciliation of operating segment Adjusted EBITDA to Income before income taxes:

	Three months ended
(in thousands)	December 28, 2018			December 29, 2017
Operating segment Adjusted EBITDA
Electrical Raceway	$	68,489		$	56,160
MP&S	10,887			10,809
Total	79,376			66,969
Unallocated expenses (a)	(9,353		)	(8,482		)
Depreciation and amortization	(18,021		)	(17,210		)
Interest expense, net	(12,160		)	(6,594		)
Restructuring and impairments	(1,387		)	(262		)
Stock-based compensation	(2,982		)	(3,564		)
Transaction costs	(164		)	(645		)
Other (b)	(206		)	(507		)
Income before income taxes	$	35,103		$	29,705

(a) Represents unallocated selling, general and administrative activities and associated expenses including, in part, executive, legal, finance, human resources, information technology, business development and communications, as well as certain costs and earnings of employee-related benefits plans, such as stock-based compensation and a portion of self-insured medical costs.

(b) Represents other items, such as inventory reserves and adjustments, release of indemnified uncertain tax positions and the impact of foreign exchange gains or losses.

	Three months ended
	December 28, 2018							December 29, 2017
(in thousands)	External Net Sales		Intersegment Sales			Adjusted EBITDA		External Net Sales		Intersegment Sales			Adjusted EBITDA
Electrical Raceway	$	343,215	$	191		$	68,489	$	316,005	$	518		$	56,160
MP&S	108,813		—			$	10,887	98,553		21			$	10,809
Eliminations	—		(191		)			—		(539		)
Consolidated operations	$	452,028	$	—				$	414,558	$	—

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

The Company's net sales by geography were as follows for the three months endedDecember 28, 2018 and December 29, 2017:

	Three months ended
(in thousands)	December 28, 2018		December 29, 2017
United States	$	395,628	$	373,828
Other Americas	9,232		8,001
Europe	33,862		20,300
Asia-Pacific	13,306		12,429
Total	$	452,028	$	414,558

The table below shows the amount of net sales from external customers for each of the Company's product categories which accounted for 10% or more of consolidated net sales in either period for the three months endedDecember 28, 2018 and December 29, 2017:

(in thousands)	December 28, 2018		December 29, 2017
Metal Electrical Conduit and Fittings	$	131,247	$	108,263
Armored Cable and Fittings	84,345		86,215
PVC Electrical Conduit and Fittings	68,233		76,225
Cable Tray and Cable Ladders	45,774		34,116
Other raceway products	13,616		11,186
Electrical Raceway	343,215		316,005
Mechanical Pipe	60,668		50,645
Metal Framing and Fittings	28,611		24,902
Other MP&S products	19,534		18,150
Impact of Fence and Sprinkler	—		4,856
MP&S	108,813		98,553
Net sales	$	452,028	$	414,558

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Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	Dec. 28, 2018	Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts Receivable, net	$ 294,181	$ 265,147
Customer liabilities	50,127	$ 3,377
Balances before adoption of ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts Receivable, net	247,989
Customer liabilities	3,935
Effect of Adoption Higher/(Lower)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts Receivable, net	46,192
Customer liabilities	$ 46,192

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Acquisitions - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 08, 2018	Dec. 28, 2018	Dec. 29, 2017
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired		$ (57,899)	$ 0
Communications Integrators, Inc.
Business Acquisition [Line Items]
Purchase price	$ 3,997
Selling, General and Administrative Expenses | Vergokan
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired		(57,899)
Acquisition related expenses		$ 148

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Acquisitions - Summary of Level 3 Fair Values Assigned to Net Assets Acquired and Liabilities Assumed As of Acquisition Date (Details) - Vergokan $ in Thousands	Oct. 01, 2018 USD ($)
Fair value of consideration transferred:
Cash consideration	$ 58,728
Fair value of assets acquired and liabilities assumed:
Cash	829
Accounts receivable	8,761
Inventories	11,560
Intangible assets	12,621
Fixed assets	32,490
Accounts payable	(18,669)
Other	1,680
Net assets acquired	49,272
Electrical Raceway
Fair value of assets acquired and liabilities assumed:
Excess purchase price attributed to goodwill acquired	$ 9,456

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Acquisitions - Summary of Fair Value as of Acquisition Date (Details) - Vergokan $ in Thousands	Oct. 01, 2018 USD ($)
Business Acquisition [Line Items]
Fair Value	$ 12,621
Weighted Average Useful Life (Years)
Customer relationships
Business Acquisition [Line Items]
Fair Value	$ 10,535
Weighted Average Useful Life (Years)	12 years
Other
Business Acquisition [Line Items]
Fair Value	$ 2,086
Weighted Average Useful Life (Years)	9 years

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Postretirement Benefits - Net Periodic Benefit Cost (Details) - Pension Plan - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1,166	$ 1,024
Expected return on plan assets	(1,593)	(1,604)
Amortization of actuarial loss	25	86
Net periodic benefit credit	$ (402)	$ (494)

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Restructuring Charges - Restructuring Reserves (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Sep. 30, 2018
Restructuring Reserve [Roll Forward]
Beginning balance	$ 551	$ 737	$ 737
Charges	1,387		2,040
Utilization	(1,598)		(2,043)
Reversals/exchange rate effects			(191)
Exchange rate effects			8
Ending balance	340		551
One-time Termination Benefits
Restructuring Reserve [Roll Forward]
Charges	285	27
Facility Closing
Restructuring Reserve [Roll Forward]
Charges	1,080	300
Operating Segments | Electrical Raceway | Severance
Restructuring Reserve [Roll Forward]
Beginning balance	212	449	449
Charges	285		536
Utilization	(175)		(787)
Reversals/exchange rate effects			0
Exchange rate effects			14
Ending balance	322		212
Operating Segments | Electrical Raceway | Other
Restructuring Reserve [Roll Forward]
Beginning balance	310	0	0
Charges	1,102		1,130
Utilization	(1,394)		(820)
Reversals/exchange rate effects			0
Exchange rate effects			0
Ending balance	18		310
Operating Segments | MP&S | Severance
Restructuring Reserve [Roll Forward]
Beginning balance	0	278	278
Charges	0		97
Utilization	0		(178)
Reversals/exchange rate effects			(191)
Exchange rate effects			(6)
Ending balance	0		0
Operating Segments | MP&S | Other
Restructuring Reserve [Roll Forward]
Beginning balance	29	10	10
Charges	0		179
Utilization	(29)		(160)
Reversals/exchange rate effects			0
Exchange rate effects			0
Ending balance	0		29
Corporate, Non-Segment | Severance
Restructuring Reserve [Roll Forward]
Beginning balance	0	$ 0	0
Charges	0		98
Utilization	0		(98)
Reversals/exchange rate effects			0
Exchange rate effects			0
Ending balance	$ 0		$ 0

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Restructuring Charges - As a Component of Selling, General and Administrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Restructuring and Related Activities [Abstract]
Total restructuring charges, net	$ 1,387	$ 262

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Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Other Income and Expenses [Abstract]
Undesignated foreign currency derivative instruments	$ (2,579)	$ 1,224
Foreign exchange (gain) loss on intercompany loans	1,381	(444)
Pension-related benefits	(402)	(494)
Other (income) expense, net	$ (1,600)	$ 286

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Income Taxes (Details) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
	Dec. 22, 2017	Dec. 21, 2017	Dec. 28, 2018	Dec. 29, 2017	Sep. 30, 2018
Operating Loss Carryforwards [Line Items]
Federal corporate tax rate	21.00%	35.00%
Effective income tax rate reconciliation, effect of Tax Cuts and Jobs Act of 2017, amount				$ 4,758	$ 708
Effective income tax rate			23.20%	8.50%
Income tax expense			$ 8,154	$ 2,516
Decrease unrecognized tax benefits			536
Other Deferred Tax Assets
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, amount			$ 266

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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income	$ 26,949	$ 27,189	$ 136,645	$ 84,639
Less: Undistributed earnings allocated to participating securities	653	217
Net income available to common shareholders	$ 26,296	$ 26,972
Denominator:
Weighted-average shares outstanding - Basic (in shares)	46,995	63,316
Effect of dilutive securities: Stock compensation plans (in shares)	1,288	2,589
Weighted-average shares outstanding - diluted (in shares)	48,283	65,905
Basic earnings per share (in dollars per share)	$ 0.56	$ 0.43
Diluted earnings per share (in dollars per share)	$ 0.54	$ 0.41

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Earnings Per Share - Antidilutive Securities (Details) - shares shares in Millions	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Common Stock | Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from calculation of diluted earnings per share (in shares)	0.6	0.4

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Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Sep. 30, 2018	Sep. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 122,059	$ 360,871	$ 360,871	$ 257,246
Other comprehensive income before reclassifications	(2,746)
Amounts reclassified from accumulated other comprehensive loss	25
Total other comprehensive (loss) income	(2,721)	396	1,544	7,968
Balance at end of period	124,155		122,059	360,871
Defined benefit pension items
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(6,048)
Other comprehensive income before reclassifications	0
Amounts reclassified from accumulated other comprehensive loss	25
Total other comprehensive (loss) income	25
Balance at end of period	(6,023)		(6,048)
Currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(10,390)
Other comprehensive income before reclassifications	(2,746)
Amounts reclassified from accumulated other comprehensive loss	0
Total other comprehensive (loss) income	(2,746)
Balance at end of period	(13,136)		(10,390)
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(16,438)	$ (17,982)	(17,982)	(25,950)
Total other comprehensive (loss) income	(2,721)		1,544	7,968
Balance at end of period	$ (19,159)		$ (16,438)	$ (17,982)

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Inventories, Net - Narrative (Details) - USD ($) $ in Thousands	Dec. 28, 2018	Sep. 30, 2018
Inventory Disclosure [Abstract]
Inventories at lower of LIFO cost or market	75.00%	80.00%
FIFO inventory amount	$ (21,982)	$ (26,340)
Excess and obsolete inventory reserve	$ (15,046)	$ (12,909)

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Inventories, Net - Schedule of Inventory (Details) - USD ($) $ in Thousands	Dec. 28, 2018	Sep. 30, 2018
Inventory Disclosure [Abstract]
Purchased materials and manufactured parts, net	$ 61,342	$ 58,572
Work in process, net	21,843	21,769
Finished goods, net	143,402	141,412
Inventories, net	$ 226,587	$ 221,753

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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 28, 2018	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 476,485	$ 438,792
Accumulated depreciation	(234,786)	(225,684)
Property, plant and equipment, net	241,699	213,108
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	19,939	13,295
Buildings and related improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	121,017	108,758
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	286,355	262,078
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	7,835	7,382
Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment	24,105	30,502
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 17,234	$ 16,777

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Property, Plant and Equipment - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 9,807	$ 8,523

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Goodwill and Intangible Assets - Change in Carrying Amount (Details) $ in Thousands	3 Months Ended
	Dec. 28, 2018 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 170,129
Goodwill acquired during year	9,456
Exchange rate effects	(788)
Balance at end of period	178,797
Electrical Raceway
Goodwill [Roll Forward]
Balance at beginning of period	133,566
Goodwill acquired during year	9,456
Exchange rate effects	(788)
Balance at end of period	142,234
MP&S
Goodwill [Roll Forward]
Balance at beginning of period	36,563
Goodwill acquired during year	0
Exchange rate effects	0
Balance at end of period	$ 36,563

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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017	Oct. 01, 2017
Goodwill [Line Items]
Intangible asset amortization	$ 8,214	$ 8,687
Electrical Raceway
Goodwill [Line Items]
Accumulated impairment loss			$ 3,924
MP&S
Goodwill [Line Items]
Accumulated impairment loss	$ 43,000

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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2018	Sep. 30, 2018
Amortizable intangible assets:
Gross Carrying Value	$ 357,667	$ 346,298
Accumulated Amortization	(155,344)	(147,262)
Net Carrying Value	202,323	199,036
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Carrying Value	450,547	439,178
Net Carrying Value	295,203	291,916
Trade names
Indefinite-lived Intangible Assets [Line Items]
Gross carrying value/net carrying value	92,880	92,880
Customer relationships
Amortizable intangible assets:
Gross Carrying Value	339,581	330,295
Accumulated Amortization	(148,773)	(141,401)
Net Carrying Value	$ 190,808	188,894
Customer relationships | Weighted Average Useful Life (Years)
Amortizable intangible assets:
Weighted Average Useful Life (Years)	10 years
Other
Amortizable intangible assets:
Gross Carrying Value	$ 18,086	16,003
Accumulated Amortization	(6,571)	(5,861)
Net Carrying Value	$ 11,515	$ 10,142
Other | Weighted Average Useful Life (Years)
Amortizable intangible assets:
Weighted Average Useful Life (Years)	8 years

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Goodwill and Intangible Assets - Future Amortization Expense (Details) (Details) $ in Thousands	Dec. 28, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Remaining 2019	$ 26,106
2020	30,310
2021	30,176
2022	28,843
2023	28,791
2024	24,094
Thereafter	$ 34,003

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Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Dec. 28, 2018	Sep. 30, 2018
Debt Instrument [Line Items]
Deferred financing costs	$ (7,788)	$ (8,194)
Other	236	279
Total debt	904,655	904,247
Less: Current portion	26,561	26,561
Long-term debt	878,094	877,686
Secured Debt | First Lien Term Loan Facility due December 22, 2023
Debt Instrument [Line Items]
First Lien Term Loan Facility due December 22, 2023	$ 912,207	$ 912,162

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Debt - ABL Credit Facility - Narrative (Details) - Atkore International - Line of credit - ABL Credit Facility - USD ($)	Dec. 28, 2018	Sep. 30, 2018
Debt Instrument [Line Items]
Aggregate commitments	$ 325,000,000
Credit availability	$ 274,954,000	$ 315,119,000

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Fair Value Measurements - Narrative (Details) $ in Thousands, £ in Millions	3 Months Ended
	Dec. 28, 2018 USD ($)	Jan. 31, 2019 USD ($)	Dec. 28, 2018 GBP (£)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 GBP (£)
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Forward currency contracts | £			£ 46.4		£ 49.1
Measurement Input, Expected Term | Minimum | Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit Derivative, Term	6 months
Measurement Input, Expected Term | Maximum | Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit Derivative, Term	5 years
Level 3 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Forward currency contracts	$ 0			$ 0
Subsequent Event [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held for sale		$ 550

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Fair Value Measurements - Assets and Liabilities Measures On a Gross Basis (Details) - Fair Value, Measurements, Recurring $ in Thousands, £ in Millions	Dec. 28, 2018 USD ($)	Dec. 28, 2018 GBP (£)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 GBP (£)
Assets
Forward currency contracts | £		£ 46.4		£ 49.1
Level 1
Assets
Cash equivalents	$ 38,771		$ 28,175
Forward currency contracts	0		0
Liabilities
Forward currency contracts	0		0
Level 2
Assets
Cash equivalents	0		0
Forward currency contracts	727		0
Liabilities
Forward currency contracts	68		1,857
Level 3
Assets
Cash equivalents	0		0
Forward currency contracts	0		0
Liabilities
Forward currency contracts	$ 0		$ 0

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Fair Value Measurements - Estimated Fair Value (Details) - Secured Debt - First Lien Term Loan Facility due December 22, 2023 - USD ($) $ in Thousands	Dec. 28, 2018	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 913,100	$ 913,100
Fair Value	$ 862,880	$ 916,113

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Commitments and Contingencies - Narrative (Details) - USD ($)	Dec. 28, 2018	Sep. 30, 2018
Loss Contingencies [Line Items]
Purchase obligations for rest of fiscal year	$ 197,115,000
Purchase obligations for year two	801,000
Total settlement for prior cap agreement deductible	13,000,000
Special Products Claims and Other Product Liabilities | Minimum
Loss Contingencies [Line Items]
Probable losses	1,000,000
Special Products Claims and Other Product Liabilities | Maximum
Loss Contingencies [Line Items]
Probable losses	9,000,000
Special Products Claims
Loss Contingencies [Line Items]
Total settlement for cap agreement deductible	12,000,000
Other Product Liability
Loss Contingencies [Line Items]
Product liability	$ 1,235,000	$ 6,755,000

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Guarantees - Narrative (Details) $ in Thousands	Dec. 28, 2018 USD ($)
Supporting workers compensation
Guarantor Obligations [Line Items]
Guarantees	$ 10,979
Surety bond
Guarantor Obligations [Line Items]
Guarantees	$ 25,199

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Segment Information - Narrative (Details)	3 Months Ended
	Dec. 28, 2018 segment
Segment Reporting [Abstract]
Number of operating segments	2

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Segment Information - Shared Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Segment Reporting Information [Line Items]
Net sales	$ 452,028	$ 414,558
Income (Loss) from Continuing Operations, Adjusted Earnings before Interest, Taxes, Depreciation and Amortization (EBITDA)	79,376	66,969
Electrical Raceway
Segment Reporting Information [Line Items]
Net sales	343,215	316,005
MP&S
Segment Reporting Information [Line Items]
Net sales	108,813	98,553
Intersegment Sales
Segment Reporting Information [Line Items]
Net sales	(191)	(539)
Intersegment Sales | Electrical Raceway
Segment Reporting Information [Line Items]
Net sales	191	518
Intersegment Sales | MP&S
Segment Reporting Information [Line Items]
Net sales	0	21
Operating Segments | Electrical Raceway
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations, Adjusted Earnings before Interest, Taxes, Depreciation and Amortization (EBITDA)	68,489	56,160
Operating Segments | MP&S
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations, Adjusted Earnings before Interest, Taxes, Depreciation and Amortization (EBITDA)	$ 10,887	$ 10,809

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Segment Information - Reconciliation of Operating Segment Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Segment Reporting Information [Line Items]
Operating segment Adjusted EBITDA	$ 79,376	$ 66,969
Unallocated expenses	(9,353)	(8,482)
Depreciation and amortization	(18,021)	(17,210)
Interest expense, net	(12,160)	(6,594)
Restructuring and impairments	(1,387)	(262)
Stock-based compensation	(2,982)	(3,564)
Transaction costs	(164)	(645)
Other	(206)	(507)
Income before income taxes	35,103	29,705
Operating Segments | Electrical Raceway
Segment Reporting Information [Line Items]
Operating segment Adjusted EBITDA	68,489	56,160
Operating Segments | MP&S
Segment Reporting Information [Line Items]
Operating segment Adjusted EBITDA	$ 10,887	$ 10,809

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Segment Information - Net Sales by Geography (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 452,028	$ 414,558
United States
Disaggregation of Revenue [Line Items]
Net sales	395,628	373,828
Other Americas
Disaggregation of Revenue [Line Items]
Net sales	9,232	8,001
Europe
Disaggregation of Revenue [Line Items]
Net sales	33,862	20,300
Asia-Pacific
Disaggregation of Revenue [Line Items]
Net sales	$ 13,306	$ 12,429

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Segment Information - Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 452,028	$ 414,558
Electrical Raceway
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	343,215	316,005
MP&S
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	108,813	98,553
Metal Electrical Conduit and Fittings | Electrical Raceway
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	131,247	108,263
Armored Cable and Fittings | Electrical Raceway
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	84,345	86,215
PVC Electrical Conduit and Fittings | Electrical Raceway
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	68,233	76,225
Cable Tray and Cable Ladders | Electrical Raceway
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	45,774	34,116
Other raceway products | Electrical Raceway
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	13,616	11,186
Mechanical Pipe | MP&S
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	60,668	50,645
Metal Framing and Fittings | MP&S
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	28,611	24,902
Other MP&S products | MP&S
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	19,534	18,150
Impact of Fence and Sprinkler | MP&S
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 0	$ 4,856