Atkore (ATKR) 10-Q 4 Feb 20 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Dec. 27, 2019	Jan. 29, 2020
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 27, 2019
Document Transition Report	false
Entity File Number	001-37793
Entity Registrant Name	Atkore International Group Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	90-0631463
Entity Address, Address Line One	16100 South Lathrop Avenue
Entity Address, City or Town	Harvey
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60426
City Area Code	708
Local Phone Number	339-1610
Title of 12(b) Security	Common Stock, $.01 par value per share
Trading Symbol	ATKR
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		47,484,231
Entity Central Index Key	0001666138
Document Fiscal Year Focus	2019
Amendment Flag	false
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--09-30

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Income Statement [Abstract]
Net sales	$ 447,448	$ 452,028
Cost of sales	330,604	341,772
Gross profit	116,844	110,256
Selling, general and administrative	56,215	56,379
Intangible asset amortization	8,113	8,214
Operating income	52,516	45,663
Interest expense, net	10,620	12,160
Other income, net	(234)	(1,600)
Income before income taxes	42,130	35,103
Income tax expense	7,340	8,154
Net income	$ 34,790	$ 26,949
Net income per share
Basic (in dollars per share)	$ 0.72	$ 0.56
Diluted (in dollars per share)	$ 0.71	$ 0.54

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 34,790	$ 26,949
Other comprehensive (loss) income , net of tax:
Change in foreign currency translation adjustment	5,109	(2,746)
Change in unrecognized loss related to pension benefit plans	207	25
Total other comprehensive income (loss)	5,316	(2,721)
Comprehensive income	$ 40,106	$ 24,228

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 30, 2019
Current Assets:
Cash and cash equivalents	$ 164,135	$ 123,415
Accounts receivable, less allowance for doubtful accounts of $2,992 and $2,608, respectively	291,880	315,353
Inventories, net	242,690	226,090
Prepaid expenses and other current assets	32,246	34,679
Total current assets	730,951	699,537
Property, plant and equipment, net	255,225	260,703
Intangible assets, net	279,748	285,684
Goodwill	188,105	186,231
Right-of-use assets, net	44,142
Deferred tax assets	735	577
Other long-term assets	1,236	4,263
Total Assets	1,500,142	1,436,995
Current Liabilities:
Accounts payable	132,868	150,681
Income tax payable	3,987	2,157
Accrued compensation and employee benefits	21,640	35,770
Customer liabilities	50,264	44,983
Lease obligations	12,605
Other current liabilities	58,646	53,943
Total current liabilities	280,010	287,534
Long-term debt	845,243	845,317
Long-term lease obligations	33,056
Deferred tax liabilities	23,402	19,986
Other long-term tax liabilities	848	3,669
Pension liabilities	33,513	34,509
Other long-term liabilities	11,939	13,044
Total Liabilities	1,228,011	1,204,059
Equity:
Common stock, $0.01 par value, 1,000,000,000 shares authorized, 47,478,557 and 46,955,163 shares issued and outstanding, respectively	476	471
Treasury stock, held at cost, 260,900 and 260,900 shares, respectively	(2,580)	(2,580)
Additional paid-in capital	477,276	477,139
Accumulated deficit	(166,659)	(200,396)
Accumulated other comprehensive loss	(36,382)	(41,698)
Total Equity	272,131	232,936
Total Liabilities and Equity	$ 1,500,142	$ 1,436,995

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 30, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,992	$ 2,608
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)	47,478,557	46,955,163
Common stock, shares outstanding (shares)	47,478,557	46,955,163
Treasury stock (shares)	260,900	260,900

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Operating activities:
Net income	$ 34,790	$ 26,949
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,730	18,021
Deferred income taxes	3,088	(1,306)
Stock-based compensation	3,123	2,982
Amortization of right-of-use assets	3,627
Other adjustments to net income	2,855	2,201
Changes in operating assets and liabilities, net of effects from acquisitions
Accounts receivable	25,139	22,111
Inventories	(17,640)	4,263
Accounts payable	(14,898)	(30,405)
Other, net	(6,641)	(4,539)
Net cash provided by operating activities	52,173	40,277
Investing activities:
Capital expenditures	(9,809)	(6,875)
Acquisition of businesses, net of cash acquired	0	(57,899)
Other, net	15	(151)
Net cash (used in) provided by investing activities	(9,794)	(64,925)
Financing activities:
Issuance of common stock	(2,981)	(695)
Repurchase of common stock	0	(24,419)
Other, net	(60)	(62)
Net cash used for financing activities	(3,041)	(25,176)
Effects of foreign exchange rate changes on cash and cash equivalents	1,382	(919)
Increase (decrease) in cash and cash equivalents	40,720	(50,743)
Cash and cash equivalents at beginning of period	123,415	126,662
Cash and cash equivalents at end of period	164,135	75,919
Supplementary Cash Flow information
Capital expenditures, not yet paid	$ 618	$ 1,106

Condensed Consolidated Statem_4

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, 2018		47,080
Balance at beginning 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)
Balance at beginning of period (in shares) at Sep. 30, 2019		46,955
Balance at beginning of period at Sep. 30, 2019	232,936	$ 471	(2,580)	477,139	(200,396)	(41,698)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	34,790				34,790
Other comprehensive (loss) income	5,316					5,316
Stock-based compensation	3,123			3,123
Issuance of common stock (in shares)		524
Issuance of common stock	(2,981)	$ 5		(2,986)
Balance at end of period (in shares) at Dec. 27, 2019		47,479
Balance at end of period at Dec. 27, 2019	$ 272,131	$ 476	$ (2,580)	$ 477,276	$ (166,659)	$ (36,382)

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	3 Months Ended
	Dec. 27, 2019
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, 2019 filed with the U.S. Securities and Exchange Commission (the "SEC") on November 22, 2019, 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. Recent Accounting Pronouncements A summary of recently adopted accounting guidance is 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 2016-02 Leases (Topic 842) The Accounting Standards Update ("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 adopted the guidance in the first quarter of 2020 using the modified retrospective method. See Note 2, "Leases" for further detail. 2 2020 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 2016-13 Financial Instruments - Credit Losses (Topic 326) The ASU adds to U.S. GAAP an impairment model (known as the current expected credit loss (CECL) model) that is based on expected losses rather than incurred losses. Under the new guidance, an entity recognizes as an allowance its estimate of expected credit losses, which the FASB believes will result in more timely recognition of such losses. Under evaluation. 2021 2018-14 Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans The ASU amends Accounting Standards Codification ("ASC") 715 to add, remove and clarify disclosure requirements related to defined benefit pension and other postretirement plans. Under evaluation. 2021

Leases (Notes)

Leases (Notes)	3 Months Ended
	Dec. 27, 2019
Leases [Abstract]
Leases	2. LEASES On October 1, 2019, we adopted ASC Topic 842 using the modified retrospective transition method. Topic 842 requires the recognition of lease assets and liabilities for operating leases, in addition to the finance lease assets and liabilities previously recorded on our condensed consolidated balance sheets. Beginning on October 1, 2019, our condensed consolidated financial statements are presented in accordance with the revised policies, while prior period amounts are not adjusted and continue to be reported in accordance with our historical policies. The modified retrospective transition method required the cumulative effect, if any, of initially applying the guidance to be recognized as an adjustment to our accumulated deficit as of our adoption date. As a result of adopting Topic 842, we recognized additional operating lease assets and liabilities of $45,519 and $46,941 as of October 1, 2019. The discount rate primarily used to calculate that adjustment was the Company's incremental borrowing rate as of the adoption date, October 1, 2019, as a rate implicit in most contracts was not readily determinable. The Company recorded a cumulative effect adjustment of $1,053 to accumulated deficit, net of tax, as a result of the adoption. The Company elected the package of practical expedients permitted under the transition guidance within Topic 842, which allowed us to carry forward prior conclusions about lease identification, classification and initial direct costs for leases entered into prior to adoption of Topic 842. Additionally, for leases with a term of 12 months or less, the Company elected the short-term lease exemption, which allowed us to not recognize right-of-use assets ("ROU") or lease liabilities for qualifying leases existing at transition and new leases we may enter into in the future. Leases with an initial term of 12 months or less are classified as short-term leases and are not recorded on the condensed consolidated balance sheets. The lease expense for short-term leases is recognized on a straight-line basis over the lease term. The Company engages in leasing transactions to meet the needs of the business. The Company leases certain warehouses and distribution centers, office space, forklifts, vehicles and other machinery and equipment. The determination to lease, rather than purchase, an asset is primarily contingent upon capital requirements, duration of the forecasted business investment, and asset availability. The Company determines if an arrangement is a lease at inception and all arrangements deemed to be leases are subject to an assessment to determine the classification between finance and operating leases. The Company's significant assumptions and judgments in determining whether a contract is or contains a lease include establishing whether the supplier has the ability to use other assets to fulfill its service or whether the terms of the agreement enable the Company to control the use of a dedicated property, plant and equipment asset during the contract term. In the majority of the Company's contracts where it must identify whether a lease is present, it is readily determinable that the Company controls the use of the assets and obtains substantially all of the economic benefit during the term of the contract. In those contracts where identification is not readily determinable, the Company has determined that the supplier has either the ability to use another asset to provide the service or the terms of the contract give the supplier the rights to operate the asset at its discretion during the term of the contract, in which case the arrangement would not constitute a lease. Right-of-use assets and lease obligations are recognized based on the present value of the future minimum lease payments over the lease term as of the commencement date. The Company’s lease agreements have terms that include both lease and non-lease components. Lease component fees are included in the present value of future minimum lease payments. Conversely, non-lease components are not subject to capitalization and are expensed as incurred. Per Topic 842, the contractual interest rate is used to calculate the present value of the future minimum lease payments. However, the majority of the Company’s leases do not provide an implicit rate. Therefore, the Company's significant assumption and judgments in determining the discount rate include determining the incremental borrowing rate. The Company’s incremental borrowing rates are based on the term of the lease, the economic environment of the lease and the effect of collateralization. The valuation of the ROU asset also includes lease payments made in advance of the lease commencement date and initial direct costs incurred to secure the lease and is reduced for lease incentives. The lease terms include options to extend or terminate the lease when it is reasonably certain the Company will exercise the options. The Company has certain leasing agreements, related to leased vehicles available to our sales personnel, that contain guaranteed residual value terms, which are not expected to be triggered. The Company’s leasing portfolio does not contain any material restrictive covenants. Leases (in thousands) December 27, 2019 Assets Operating lease assets $ 42,812 Finance lease assets 3,962 Total right-of-use assets, gross $ 46,774 Less: accumulated depreciation and amortization (2,632 ) Right-of-use assets, net $ 44,142 Liabilities Current liabilities: Current portion of operating lease liabilities $ 12,149 Current portion of finance lease liabilities 456 Lease obligations $ 12,605 Noncurrent liabilities: Operating lease liabilities $ 31,972 Finance lease liabilities 1,084 Long-term lease obligations $ 33,056 Total lease obligations $ 45,661 Lease Cost The following table summarizes lease costs by type of cost for the three months ended December 27, 2019 . In the condensed consolidated statements of operations , cost of sales and selling, general and administrative expenses included lease costs of $2,755 and $1,159 , respectively. (in thousands) Three months ended December 27, 2019 Condensed Consolidated Statement of Operations Classification Total Amortization of right-of-use assets $ 3,627 Interest on lease liabilities 8 Variable lease costs 39 Short term lease costs 240 Total lease costs $ 3,914 Maturity of Lease Liabilities The Company's maturity analysis of its lease liabilities as of December 27, 2019 is as follows: (in thousands) Financing Leases Operating Leases 2020 $ 433 $ 13,950 2021 412 10,987 2022 387 8,496 2023 295 6,170 2024 60 4,929 2025 and after — 6,143 Total lease payments $ 1,587 $ 50,675 Less: Interest (47 ) (6,554 ) Present value of lease liabilities $ 1,540 $ 44,121 The following represents the Company's future minimum rental payments at September 30, 2019 for agreements classified as operating leases under ASC 840 with non-cancelable terms in excess of one year: 2020 $ 13,526 2021 11,592 2022 8,666 2023 6,362 2024 5,097 2025 and thereafter 6,938 Total $ 52,181 Lease Term and Discount Rate December 27, 2019 Weighted-average remaining lease term (years) Operating leases 4.84 Finance leases 3.71 Weighted-average discount rate Operating leases 4.34 % Finance leases 3.22 % Other Information (in thousands) Three months ended December 27, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases 3,216 Operating cash flows from finance leases 4 Financing cash flows from finance leases 128
Leases	2. LEASES On October 1, 2019, we adopted ASC Topic 842 using the modified retrospective transition method. Topic 842 requires the recognition of lease assets and liabilities for operating leases, in addition to the finance lease assets and liabilities previously recorded on our condensed consolidated balance sheets. Beginning on October 1, 2019, our condensed consolidated financial statements are presented in accordance with the revised policies, while prior period amounts are not adjusted and continue to be reported in accordance with our historical policies. The modified retrospective transition method required the cumulative effect, if any, of initially applying the guidance to be recognized as an adjustment to our accumulated deficit as of our adoption date. As a result of adopting Topic 842, we recognized additional operating lease assets and liabilities of $45,519 and $46,941 as of October 1, 2019. The discount rate primarily used to calculate that adjustment was the Company's incremental borrowing rate as of the adoption date, October 1, 2019, as a rate implicit in most contracts was not readily determinable. The Company recorded a cumulative effect adjustment of $1,053 to accumulated deficit, net of tax, as a result of the adoption. The Company elected the package of practical expedients permitted under the transition guidance within Topic 842, which allowed us to carry forward prior conclusions about lease identification, classification and initial direct costs for leases entered into prior to adoption of Topic 842. Additionally, for leases with a term of 12 months or less, the Company elected the short-term lease exemption, which allowed us to not recognize right-of-use assets ("ROU") or lease liabilities for qualifying leases existing at transition and new leases we may enter into in the future. Leases with an initial term of 12 months or less are classified as short-term leases and are not recorded on the condensed consolidated balance sheets. The lease expense for short-term leases is recognized on a straight-line basis over the lease term. The Company engages in leasing transactions to meet the needs of the business. The Company leases certain warehouses and distribution centers, office space, forklifts, vehicles and other machinery and equipment. The determination to lease, rather than purchase, an asset is primarily contingent upon capital requirements, duration of the forecasted business investment, and asset availability. The Company determines if an arrangement is a lease at inception and all arrangements deemed to be leases are subject to an assessment to determine the classification between finance and operating leases. The Company's significant assumptions and judgments in determining whether a contract is or contains a lease include establishing whether the supplier has the ability to use other assets to fulfill its service or whether the terms of the agreement enable the Company to control the use of a dedicated property, plant and equipment asset during the contract term. In the majority of the Company's contracts where it must identify whether a lease is present, it is readily determinable that the Company controls the use of the assets and obtains substantially all of the economic benefit during the term of the contract. In those contracts where identification is not readily determinable, the Company has determined that the supplier has either the ability to use another asset to provide the service or the terms of the contract give the supplier the rights to operate the asset at its discretion during the term of the contract, in which case the arrangement would not constitute a lease. Right-of-use assets and lease obligations are recognized based on the present value of the future minimum lease payments over the lease term as of the commencement date. The Company’s lease agreements have terms that include both lease and non-lease components. Lease component fees are included in the present value of future minimum lease payments. Conversely, non-lease components are not subject to capitalization and are expensed as incurred. Per Topic 842, the contractual interest rate is used to calculate the present value of the future minimum lease payments. However, the majority of the Company’s leases do not provide an implicit rate. Therefore, the Company's significant assumption and judgments in determining the discount rate include determining the incremental borrowing rate. The Company’s incremental borrowing rates are based on the term of the lease, the economic environment of the lease and the effect of collateralization. The valuation of the ROU asset also includes lease payments made in advance of the lease commencement date and initial direct costs incurred to secure the lease and is reduced for lease incentives. The lease terms include options to extend or terminate the lease when it is reasonably certain the Company will exercise the options. The Company has certain leasing agreements, related to leased vehicles available to our sales personnel, that contain guaranteed residual value terms, which are not expected to be triggered. The Company’s leasing portfolio does not contain any material restrictive covenants. Leases (in thousands) December 27, 2019 Assets Operating lease assets $ 42,812 Finance lease assets 3,962 Total right-of-use assets, gross $ 46,774 Less: accumulated depreciation and amortization (2,632 ) Right-of-use assets, net $ 44,142 Liabilities Current liabilities: Current portion of operating lease liabilities $ 12,149 Current portion of finance lease liabilities 456 Lease obligations $ 12,605 Noncurrent liabilities: Operating lease liabilities $ 31,972 Finance lease liabilities 1,084 Long-term lease obligations $ 33,056 Total lease obligations $ 45,661 Lease Cost The following table summarizes lease costs by type of cost for the three months ended December 27, 2019 . In the condensed consolidated statements of operations , cost of sales and selling, general and administrative expenses included lease costs of $2,755 and $1,159 , respectively. (in thousands) Three months ended December 27, 2019 Condensed Consolidated Statement of Operations Classification Total Amortization of right-of-use assets $ 3,627 Interest on lease liabilities 8 Variable lease costs 39 Short term lease costs 240 Total lease costs $ 3,914 Maturity of Lease Liabilities The Company's maturity analysis of its lease liabilities as of December 27, 2019 is as follows: (in thousands) Financing Leases Operating Leases 2020 $ 433 $ 13,950 2021 412 10,987 2022 387 8,496 2023 295 6,170 2024 60 4,929 2025 and after — 6,143 Total lease payments $ 1,587 $ 50,675 Less: Interest (47 ) (6,554 ) Present value of lease liabilities $ 1,540 $ 44,121 The following represents the Company's future minimum rental payments at September 30, 2019 for agreements classified as operating leases under ASC 840 with non-cancelable terms in excess of one year: 2020 $ 13,526 2021 11,592 2022 8,666 2023 6,362 2024 5,097 2025 and thereafter 6,938 Total $ 52,181 Lease Term and Discount Rate December 27, 2019 Weighted-average remaining lease term (years) Operating leases 4.84 Finance leases 3.71 Weighted-average discount rate Operating leases 4.34 % Finance leases 3.22 % Other Information (in thousands) Three months ended December 27, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases 3,216 Operating cash flows from finance leases 4 Financing cash flows from finance leases 128

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Dec. 27, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	3. REVENUE FROM CONTRACTS WITH CUSTOMERS 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. 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 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 18, ''Segment Information'' for revenue disaggregated by geography and product categories.

Acquisitions

Acquisitions	3 Months Ended
	Dec. 27, 2019
Business Combinations [Abstract]
Acquisitions	4. 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 August 21, 2019, Atkore Plastic Pipe Corporation, a wholly-owned subsidiary of the Company acquired the assets of Rocky Mountain Pipe ("Cor-Tek"), a manufacturer of PVC conduit for electrical applications, and considered a leading innovator in cellular core extrusion technology for a purchase price of $14,835 . In connection with this acquisition, the Company recorded a bargain purchase gain of $7,384 within other income, net during the fourth quarter of fiscal 2019 in the Statement of Operations. The Company believes that it was able to acquire the net assets of Cor-Tek for less than fair value as a result of Cor-Tek’s financial difficulties. On August 12, 2019, Unistrut Limited, a wholly-owned subsidiary of the Company, acquired Flytec Systems Ltd. and its parent holding company, Modern Associates Ltd., (collectively "Flytec"), a manufacturer of metal surface trunking, including IP4X, perimeter systems, pedestal boxes, as well as underfloor installations and industrial floor trunking. The purchase price was immaterial to the Company. On June 3, 2019, AFC Cable Systems, Inc., a wholly-owned subsidiary of the Company acquired the assets of United Structural Products, LLC. ("U.S. Tray"), a manufacturer of welded aluminum and engineered-to-order cable trays for a purchase price of $25,507 , net of cash received. As a result of the acquisition, the Company recognized $7,295 of goodwill, $14,800 of identifiable intangible assets and $3,412 of working capital and other net other tangible assets. On October 1, 2018, Allied Luxembourg S.a.r.l, a wholly-owned subsidiary of 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. All the above acquisitions were funded with cash on hand. The condensed consolidated financial statements include the results of the acquired companies from the acquisition date. Due to the immaterial nature of these acquisitions, both individually, and in the aggregate, the Company did not include the full year pro forma results of operations for the acquisition year or previous years. 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 for fiscal 2019 : (in thousands) Vergokan Other Total Fair value of consideration transferred: Cash consideration $ 58,728 $ 41,641 $ 100,369 Other liability consideration — 1,400 $ 1,400 Total consideration transferred 58,728 43,041 101,769 Fair value of assets acquired and liabilities assumed: Cash 829 1,541 2,370 Accounts receivable 8,761 8,217 16,978 Inventories 11,434 7,494 18,928 Intangible assets 12,621 16,400 29,021 Fixed assets 32,490 19,298 51,788 Accounts payable (18,716 ) (7,608 ) (26,324 ) Gain on purchase of business — (7,384 ) (7,384 ) Other 1,680 (3,412 ) (1,732 ) Net assets acquired 49,099 34,546 83,645 Excess purchase price attributed to goodwill acquired $ 9,629 $ 8,495 $ 18,124 The following table summarizes the fair value of intangible assets as of the acquisition date: Vergokan Other ($ in thousands) Fair Value Weighted Average Useful Life (Years) Fair Value Weighted Average Useful Life (Years) Customer relationships $ 10,535 12.0 $ 15,400 10.0 Other 2,086 9.0 1,000 9.0 Total intangible assets $ 12,621 $ 16,400 The purchase price allocation, intangible asset values and related estimates of useful lives for all 2019 acquisitions have been finalized as of December 27, 2019 .

Postretirement Benefits

Postretirement Benefits	3 Months Ended
	Dec. 27, 2019
Retirement Benefits [Abstract]
Postretirement Benefits	5. 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 27, 2019 December 28, 2018 Interest cost $ 935 $ 1,166 Expected return on plan assets (1,583 ) (1,593 ) Amortization of actuarial loss 222 25 Net periodic benefit credit 7 $ (426 ) $ (402 )

Restructuring Charges

Restructuring Charges	3 Months Ended
	Dec. 27, 2019
Restructuring and Related Activities [Abstract]
Restructuring Charges	6. 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 (in thousands) Severance (a) Other (a) Severance Other Total Balance as of September 30, 2018 $ 212 $ 310 $ — $ 29 $ 551 Charges 1,047 2,544 213 — 3,804 Utilization (867 ) (2,854 ) (68 ) (29 ) (3,818 ) Balance as of September 30, 2019 392 — 145 — 537 Charges 12 208 — — 220 Utilization (26 ) (208 ) (108 ) — (342 ) Exchange rate effects 14 — — — 14 Balance as of December 27, 2019 $ 392 $ — $ 37 $ — $ 429 (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 $12 and $285 related to termination benefits during the three months ended December 27, 2019 and December 28, 2018 , respectively. The Company recorded other restructuring charges to close facilities of $208 and $1,080 for the three months ended December 27, 2019 and December 28, 2018 , respectively. The Company expects to utilize all restructuring accruals as of December 27, 2019 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 27, 2019 December 28, 2018 Total restructuring charges, net $ 220 $ 1,387

Other Income, Net

Other Income, Net	3 Months Ended
	Dec. 27, 2019
Other Income and Expenses [Abstract]
Other Income, Net	7. OTHER INCOME, NET Other income, net consisted of the following: Three months ended (in thousands) December 27, 2019 December 28, 2018 Undesignated foreign currency derivative instruments 3,123 (2,579 ) Foreign exchange (gain) loss on intercompany loans (2,931 ) 1,381 Pension-related benefits (426 ) (402 ) Other income, net $ (234 ) $ (1,600 )

Income Taxes

Income Taxes	3 Months Ended
	Dec. 27, 2019
Income Tax Disclosure [Abstract]
Income Taxes	8. INCOME TAXES For the three months ended December 27, 2019 and December 28, 2018 , the Company's effective tax rate attributable to income before income taxes was 17.4% and 23.2% , respectively. For the three months ended December 27, 2019 and December 28, 2018 , the Company's income tax expense was $7,340 and $8,154 respectively. The decrease in the current period effective tax rate was primarily due to an increase in the excess tax benefit associated with stock compensation . A valuation allowance has been recorded against certain net operating losses in certain foreign jurisdictions. A valuation allowance is recorded when it is determined to be more likely than not that these 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 in the appropriate character and jurisdiction to utilize the assets. 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 we have determined are more likely than not to be realized upon examination. We record interest and penalties related to unrecognized tax benefits as a component of income tax expense. For the three months ended December 27, 2019 there was no change in the balance of unrecognized tax benefits. For the three months ended December 27, 2019 , 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.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Dec. 27, 2019
Earnings Per Share [Abstract]
Earnings Per Share	9. 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 27, 2019 December 28, 2018 Numerator: Net income $ 34,790 $ 26,949 Less: Undistributed earnings allocated to participating securities 857 653 Net income available to common shareholders $ 33,933 $ 26,296 Denominator: Basic weighted average common shares outstanding 47,126 46,995 Effect of dilutive securities: Non-participating employee stock options (1) 873 1,288 Diluted weighted average common shares outstanding 47,999 48,283 Basic earnings per share $ 0.72 $ 0.56 Diluted earnings per share $ 0.71 $ 0.54 (1) Stock options to purchase approximately 0.1 million and 0.6 million shares of common stock were outstanding during the three months ended December 27, 2019 and December 28, 2018, respectively, but were not included in the calculation of diluted earnings per share as the impact of these options would have been anti-dilutive.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	3 Months Ended
	Dec. 27, 2019
Equity [Abstract]
Accumulated Other Comprehensive Loss	10. ACCUMULATED OTHER COMPREHENSIVE LOSS The following table presents the changes in accumulated other comprehensive loss by component for the three months ended December 27, 2019 and December 28, 2018 . (in thousands) Defined benefit pension items Currency translation adjustments Total Balance as of September 30, 2019 $ (23,818 ) $ (17,880 ) $ (41,698 ) Other comprehensive loss before reclassifications — 5,109 5,109 Amounts reclassified from accumulated other 207 — 207 Net current period other comprehensive income 207 5,109 5,316 Balance as of December 27, 2019 $ (23,611 ) $ (12,771 ) $ (36,382 ) (in thousands) Defined benefit pension items Currency translation adjustments Total Balance as of September 30, 2018 $ (6,048 ) $ (10,390 ) $ (16,438 ) Other comprehensive loss before reclassifications — (2,746 ) (2,746 ) Amounts reclassified from accumulated other 25 — 25 Net current period other comprehensive income (loss) 25 (2,746 ) (2,721 ) Balance as of December 28, 2018 $ (6,023 ) $ (13,136 ) $ (19,159 )

Inventories, Net

Inventories, Net	3 Months Ended
	Dec. 27, 2019
Inventory Disclosure [Abstract]
Inventories, Net	11. 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 72% and 72% of the Company's inventories were valued at the lower of LIFO cost or market at December 27, 2019 and September 30, 2019 , respectively. Interim LIFO determinations, including those at December 27, 2019 , are based on management's estimates of future inventory levels and costs for the remainder of the current fiscal year. (in thousands) December 27, 2019 September 30, 2019 Purchased materials and manufactured parts, net $ 53,141 $ 52,742 Work in process, net 24,678 21,424 Finished goods, net 164,871 151,924 Inventories, net $ 242,690 $ 226,090 Total inventories would be $2,639 and $3,138 higher than reported as of December 27, 2019 and September 30, 2019 , respectively, if the first-in, first-out method was used for all inventories. As of December 27, 2019 , and September 30, 2019 , the excess and obsolete inventory reserve was $15,140 and $14,295

Property, Plant and Equipment

Property, Plant and Equipment	3 Months Ended
	Dec. 27, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	12. PROPERTY, PLANT AND EQUIPMENT As of December 27, 2019 , and September 30, 2019 , property, plant and equipment at cost and accumulated depreciation were as follows: (in thousands) December 27, 2019 September 30, 2019 Land $ 20,058 $ 19,897 Buildings and related improvements 128,376 127,061 Machinery and equipment 320,100 318,421 Leasehold improvements 8,916 9,055 Software 25,795 24,835 Construction in progress 22,487 21,264 Property, plant and equipment 525,732 520,533 Accumulated depreciation (270,507 ) (259,830 ) Property, plant and equipment, net $ 255,225 $ 260,703 Depreciation expense for the three months ended December 27, 2019 and December 28, 2018 totaled $10,617 and $9,807

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Dec. 27, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	13. 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, 2019 $ 149,668 $ 36,563 $ 186,231 Exchange rate effects 1,874 — 1,874 Balance as of December 27, 2019 $ 151,542 $ 36,563 $ 188,105 Goodwill balances as of October 1, 2019 and December 27, 2019 include $3,924 and $43,000 of accumulated impairment losses within the Electrical Raceway and MP&S segments, respectively. The Company assesses the recoverability of goodwill and indefinite-lived trade names on an annual basis in accordance with ASC 350, "Intangibles - Goodwill and Other." The measurement date is the first day of the fourth fiscal quarter, or more frequently, if events or circumstances indicate that it is more likely than not that the fair value of a reporting unit or the respective indefinite-lived trade name is less than the carrying value. The following table provides the gross carrying value, accumulated amortization and net carrying value for each major class of intangible assets: December 27, 2019 September 30, 2019 ($ 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 11 $ 355,992 $ (179,950 ) $ 176,042 $ 353,256 $ (171,777 ) $ 181,479 Other 7 19,086 (8,260 ) 10,826 19,086 (7,761 ) 11,325 Total 375,078 (188,210 ) 186,868 372,342 (179,538 ) 192,804 Indefinite-lived intangible assets: Trade names 92,880 — 92,880 92,880 — 92,880 Total $ 467,958 $ (188,210 ) $ 279,748 $ 465,222 $ (179,538 ) $ 285,684 Other intangible assets consist of definite-lived trade names, technology, non-compete agreements and backlogs. Amortization expense for the three months ended December 27, 2019 and December 28, 2018 was $8,113 and $8,214 , respectively. Expected amortization expense for intangible assets for the remainder of fiscal 2020 and over the next five years and thereafter is as follows: (in thousands) Remaining 2020 $ 25,854 2021 32,314 2022 30,980 2023 30,860 2024 26,403 2025 13,844 Thereafter 26,613 Actual amounts of amortization may differ from estimated amounts due to additional intangible asset acquisitions, impairment of intangible assets and other events.

Debt

Debt	3 Months Ended
	Dec. 27, 2019
Debt Disclosure [Abstract]
Debt	14. DEBT Debt as of December 27, 2019 and September 30, 2019 was as follows: (in thousands) December 27, 2019 September 30, 2019 First Lien Term Loan Facility due December 22, 2023 $ 851,406 $ 851,361 Deferred financing costs (6,163 ) (6,569 ) Other — 525 Total debt $ 845,243 $ 845,317 Less: Current portion — — Long-term debt $ 845,243 $ 845,317 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 $282,628 and $301,882 as of December 27, 2019 and September 30, 2019 , respectively.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Dec. 27, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	15. 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 balances denominated in a foreign currency. These derivative instruments are not formally designated as hedges by the Company and the terms of these instruments range at inception from six months to five years . Short-term forward currency contracts are recorded in either other current assets or other current liabilities and long-term forward currency contracts are recorded in either other long-term assets or other long-term liabilities in the condensed consolidated balance sheet. The fair value gains and losses are included in other income, net within the condensed consolidated statements of operations . See Note 7, ''Other Income, net'' for further detail. The total notional amounts of undesignated forward currency contracts were £ 45.0 million and £ 45.0 million as of December 27, 2019 and September 30, 2019 , 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 27, 2019 September 30, 2019 (in thousands) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Assets Cash equivalents $ 111,422 $ — $ — $ 72,132 $ — $ — Forward currency contracts — 297 — — 3,420 — 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 27, 2019 September 30, 2019 (in thousands) Carrying Value Fair Value Carrying Value Fair Value First Lien Term Loan Facility due December 22, 2023 $ 852,120 $ 854,677 $ 852,120 $ 853,543 In determining the approximate fair value of its long-term debt, the Company used the trading values among financial institutions, and these values fall 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.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Dec. 27, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	16. COMMITMENTS AND CONTINGENCIES The Company has obligations related to commitments to purchase certain goods. As of December 27, 2019 , such obligations were $211,046 for the rest of fiscal year 2020 and $976 for fiscal year 2021 and beyond. 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 $2,577 and $2,424 as of December 27, 2019 and September 30, 2019 , respectively. As of December 27, 2019 , the Company believes that the range of reasonably possible losses for Special Products Claims and other product liabilities is between $1,000 and $8,000 . During fiscal 2019, 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. In conjunction with the payment of that settlement, Tyco and the Company examined the Company's total Special Products Claim payments and agreed that with that settlement payment and payment of a few other legal fee invoices, all of which have now been paid, the Company had met its $12,000 deductible obligation related to these Special Products Claims. Tyco, now Johnson Controls, Inc. ("JCI"), has a contractual obligation to indemnify the Company in respect of all remaining and future claims of incompatibility between the Company's antimicrobial coated steel sprinkler pipe and CPVC pipe used in the same sprinkler system. Tyco has defended and indemnified the Company on Special Products Claims as required. 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.

Guarantees

Guarantees	3 Months Ended
	Dec. 27, 2019
Guarantees [Abstract]
Guarantees	17. GUARANTEES The Company had outstanding letters of credit totaling $9,501 supporting workers' compensation and general liability insurance policies as of December 27, 2019 . The Company also had surety bonds primarily related to performance guarantees on supply agreements and construction contracts, and payment of duties and taxes totaling $18,498 as of December 27, 2019 . 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.

Segment Information

Segment Information	3 Months Ended
	Dec. 27, 2019
Segment Reporting [Abstract]
Segment Information	18. 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) before income taxes, adjusted to exclude unallocated expenses, depreciation and amortization, interest expense, net, restructuring charges, stock-based compensation, certain legal matters, transaction costs 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 27, 2019 December 28, 2018 (in thousands) External Net Sales Intersegment Sales Adjusted EBITDA External Net Sales Intersegment Sales Adjusted EBITDA Electrical Raceway $ 340,788 $ 588 $ 70,193 $ 343,215 $ 191 $ 68,489 MP&S 106,660 — 16,654 108,813 — 10,887 Eliminations — (588 ) — (191 ) Consolidated operations $ 447,448 $ — $ 452,028 $ — Presented below is a reconciliation of operating segment Adjusted EBITDA to Income before income taxes : Three months ended (in thousands) December 27, 2019 December 28, 2018 Operating segment Adjusted EBITDA Electrical Raceway $ 70,193 $ 68,489 MP&S 16,654 10,887 Total 86,847 79,376 Unallocated expenses (a) (9,137 ) (9,353 ) Depreciation and amortization (18,730 ) (18,021 ) Interest expense, net (10,620 ) (12,160 ) Restructuring charges (220 ) (1,387 ) Stock-based compensation (3,123 ) (2,982 ) Transaction costs (51 ) (164 ) Other (b) (2,836 ) (206 ) Income before income taxes $ 42,130 $ 35,103 (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 ended December 27, 2019 and December 28, 2018 : Three months ended (in thousands) December 27, 2019 December 28, 2018 United States $ 396,141 $ 395,628 Other Americas 6,586 9,232 Europe 33,309 33,862 Asia-Pacific 11,412 13,306 Total $ 447,448 $ 452,028 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 ended December 27, 2019 and December 28, 2018 : Three months ended (in thousands) December 27, 2019 December 28, 2018 Metal Electrical Conduit and Fittings $ 123,842 131,247 Armored Cable and Fittings 83,823 84,345 PVC Electrical Conduit and Fittings 72,888 68,233 Cable Tray and Cable Ladders 50,246 45,774 Other raceway products 9,989 13,616 Electrical Raceway 340,788 343,215 Mechanical Pipe 58,331 60,668 Other MP&S products 48,329 48,145 MP&S 106,660 108,813 Net sales $ 447,448 $ 452,028

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Dec. 27, 2019
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, 2019 filed with the U.S. Securities and Exchange Commission (the "SEC") on November 22, 2019, 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.
Recent Accounting Pronouncements	Recent Accounting Pronouncements A summary of recently adopted accounting guidance is 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 2016-02 Leases (Topic 842) The Accounting Standards Update ("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 adopted the guidance in the first quarter of 2020 using the modified retrospective method. See Note 2, "Leases" for further detail. 2 2020 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 2016-13 Financial Instruments - Credit Losses (Topic 326) The ASU adds to U.S. GAAP an impairment model (known as the current expected credit loss (CECL) model) that is based on expected losses rather than incurred losses. Under the new guidance, an entity recognizes as an allowance its estimate of expected credit losses, which the FASB believes will result in more timely recognition of such losses. Under evaluation. 2021 2018-14 Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans The ASU amends Accounting Standards Codification ("ASC") 715 to add, remove and clarify disclosure requirements related to defined benefit pension and other postretirement plans. Under evaluation. 2021
Leases	The Company elected the package of practical expedients permitted under the transition guidance within Topic 842, which allowed us to carry forward prior conclusions about lease identification, classification and initial direct costs for leases entered into prior to adoption of Topic 842. Additionally, for leases with a term of 12 months or less, the Company elected the short-term lease exemption, which allowed us to not recognize right-of-use assets ("ROU") or lease liabilities for qualifying leases existing at transition and new leases we may enter into in the future. Leases with an initial term of 12 months or less are classified as short-term leases and are not recorded on the condensed consolidated balance sheets. The lease expense for short-term leases is recognized on a straight-line basis over the lease term. The Company engages in leasing transactions to meet the needs of the business. The Company leases certain warehouses and distribution centers, office space, forklifts, vehicles and other machinery and equipment. The determination to lease, rather than purchase, an asset is primarily contingent upon capital requirements, duration of the forecasted business investment, and asset availability. The Company determines if an arrangement is a lease at inception and all arrangements deemed to be leases are subject to an assessment to determine the classification between finance and operating leases. The Company's significant assumptions and judgments in determining whether a contract is or contains a lease include establishing whether the supplier has the ability to use other assets to fulfill its service or whether the terms of the agreement enable the Company to control the use of a dedicated property, plant and equipment asset during the contract term. In the majority of the Company's contracts where it must identify whether a lease is present, it is readily determinable that the Company controls the use of the assets and obtains substantially all of the economic benefit during the term of the contract. In those contracts where identification is not readily determinable, the Company has determined that the supplier has either the ability to use another asset to provide the service or the terms of the contract give the supplier the rights to operate the asset at its discretion during the term of the contract, in which case the arrangement would not constitute a lease. Right-of-use assets and lease obligations are recognized based on the present value of the future minimum lease payments over the lease term as of the commencement date. The Company’s lease agreements have terms that include both lease and non-lease components. Lease component fees are included in the present value of future minimum lease payments. Conversely, non-lease components are not subject to capitalization and are expensed as incurred. Per Topic 842, the contractual interest rate is used to calculate the present value of the future minimum lease payments. However, the majority of the Company’s leases do not provide an implicit rate. Therefore, the Company's significant assumption and judgments in determining the discount rate include determining the incremental borrowing rate. The Company’s incremental borrowing rates are based on the term of the lease, the economic environment of the lease and the effect of collateralization. The valuation of the ROU asset also includes lease payments made in advance of the lease commencement date and initial direct costs incurred to secure the lease and is reduced for lease incentives. The lease terms include options to extend or terminate the lease when it is reasonably certain the Company will exercise the options.

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Dec. 27, 2019
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 is 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 2016-02 Leases (Topic 842) The Accounting Standards Update ("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 adopted the guidance in the first quarter of 2020 using the modified retrospective method. See Note 2, "Leases" for further detail. 2 2020 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 2016-13 Financial Instruments - Credit Losses (Topic 326) The ASU adds to U.S. GAAP an impairment model (known as the current expected credit loss (CECL) model) that is based on expected losses rather than incurred losses. Under the new guidance, an entity recognizes as an allowance its estimate of expected credit losses, which the FASB believes will result in more timely recognition of such losses. Under evaluation. 2021 2018-14 Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans The ASU amends Accounting Standards Codification ("ASC") 715 to add, remove and clarify disclosure requirements related to defined benefit pension and other postretirement plans. Under evaluation. 2021

Leases (Tables)

Leases (Tables)	3 Months Ended
	Dec. 27, 2019
Leases [Abstract]
Assets and liabilities	Leases (in thousands) December 27, 2019 Assets Operating lease assets $ 42,812 Finance lease assets 3,962 Total right-of-use assets, gross $ 46,774 Less: accumulated depreciation and amortization (2,632 ) Right-of-use assets, net $ 44,142 Liabilities Current liabilities: Current portion of operating lease liabilities $ 12,149 Current portion of finance lease liabilities 456 Lease obligations $ 12,605 Noncurrent liabilities: Operating lease liabilities $ 31,972 Finance lease liabilities 1,084 Long-term lease obligations $ 33,056 Total lease obligations $ 45,661
Lease, cost	Lease Term and Discount Rate December 27, 2019 Weighted-average remaining lease term (years) Operating leases 4.84 Finance leases 3.71 Weighted-average discount rate Operating leases 4.34 % Finance leases 3.22 % Other Information (in thousands) Three months ended December 27, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases 3,216 Operating cash flows from finance leases 4 Financing cash flows from finance leases 128 The following table summarizes lease costs by type of cost for the three months ended December 27, 2019 . In the condensed consolidated statements of operations , cost of sales and selling, general and administrative expenses included lease costs of $2,755 and $1,159 , respectively. (in thousands) Three months ended December 27, 2019 Condensed Consolidated Statement of Operations Classification Total Amortization of right-of-use assets $ 3,627 Interest on lease liabilities 8 Variable lease costs 39 Short term lease costs 240 Total lease costs $ 3,914
Operating lease liability, maturity	The Company's maturity analysis of its lease liabilities as of December 27, 2019 is as follows: (in thousands) Financing Leases Operating Leases 2020 $ 433 $ 13,950 2021 412 10,987 2022 387 8,496 2023 295 6,170 2024 60 4,929 2025 and after — 6,143 Total lease payments $ 1,587 $ 50,675 Less: Interest (47 ) (6,554 ) Present value of lease liabilities $ 1,540 $ 44,121
Finance lease, liability, maturity	The Company's maturity analysis of its lease liabilities as of December 27, 2019 is as follows: (in thousands) Financing Leases Operating Leases 2020 $ 433 $ 13,950 2021 412 10,987 2022 387 8,496 2023 295 6,170 2024 60 4,929 2025 and after — 6,143 Total lease payments $ 1,587 $ 50,675 Less: Interest (47 ) (6,554 ) Present value of lease liabilities $ 1,540 $ 44,121
Schedule of Minimum Future Operating Lease Payments	The following represents the Company's future minimum rental payments at September 30, 2019 for agreements classified as operating leases under ASC 840 with non-cancelable terms in excess of one year: 2020 $ 13,526 2021 11,592 2022 8,666 2023 6,362 2024 5,097 2025 and thereafter 6,938 Total $ 52,181

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Dec. 27, 2019
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the Level 3 fair values assigned to the net assets acquired and liabilities assumed as of the acquisition date for fiscal 2019 : (in thousands) Vergokan Other Total Fair value of consideration transferred: Cash consideration $ 58,728 $ 41,641 $ 100,369 Other liability consideration — 1,400 $ 1,400 Total consideration transferred 58,728 43,041 101,769 Fair value of assets acquired and liabilities assumed: Cash 829 1,541 2,370 Accounts receivable 8,761 8,217 16,978 Inventories 11,434 7,494 18,928 Intangible assets 12,621 16,400 29,021 Fixed assets 32,490 19,298 51,788 Accounts payable (18,716 ) (7,608 ) (26,324 ) Gain on purchase of business — (7,384 ) (7,384 ) Other 1,680 (3,412 ) (1,732 ) Net assets acquired 49,099 34,546 83,645 Excess purchase price attributed to goodwill acquired $ 9,629 $ 8,495 $ 18,124
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 Other ($ in thousands) Fair Value Weighted Average Useful Life (Years) Fair Value Weighted Average Useful Life (Years) Customer relationships $ 10,535 12.0 $ 15,400 10.0 Other 2,086 9.0 1,000 9.0 Total intangible assets $ 12,621 $ 16,400

Postretirement Benefits (Tables

Postretirement Benefits (Tables)	3 Months Ended
	Dec. 27, 2019
Retirement Benefits [Abstract]
Schedule of Net Periodic Benefit Cost	The net periodic benefit credit was as follows: Three months ended (in thousands) Note December 27, 2019 December 28, 2018 Interest cost $ 935 $ 1,166 Expected return on plan assets (1,583 ) (1,593 ) Amortization of actuarial loss 222 25 Net periodic benefit credit 7 $ (426 ) $ (402 )

Restructuring Charges (Tables)

Restructuring Charges (Tables)	3 Months Ended
	Dec. 27, 2019
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 (in thousands) Severance (a) Other (a) Severance Other Total Balance as of September 30, 2018 $ 212 $ 310 $ — $ 29 $ 551 Charges 1,047 2,544 213 — 3,804 Utilization (867 ) (2,854 ) (68 ) (29 ) (3,818 ) Balance as of September 30, 2019 392 — 145 — 537 Charges 12 208 — — 220 Utilization (26 ) (208 ) (108 ) — (342 ) Exchange rate effects 14 — — — 14 Balance as of December 27, 2019 $ 392 $ — $ 37 $ — $ 429 (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 $12 and $285 related to termination benefits during the three months ended December 27, 2019 and December 28, 2018 , respectively. The Company recorded other restructuring charges to close facilities of $208 and $1,080 for the three months ended December 27, 2019 and December 28, 2018 , 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 27, 2019 December 28, 2018 Total restructuring charges, net $ 220 $ 1,387

Other Income, Net (Tables)

Other Income, Net (Tables)	3 Months Ended
	Dec. 27, 2019
Other Income and Expenses [Abstract]
Schedule of Other Expense, Net	Other income, net consisted of the following: Three months ended (in thousands) December 27, 2019 December 28, 2018 Undesignated foreign currency derivative instruments 3,123 (2,579 ) Foreign exchange (gain) loss on intercompany loans (2,931 ) 1,381 Pension-related benefits (426 ) (402 ) Other income, net $ (234 ) $ (1,600 )

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Dec. 27, 2019
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 27, 2019 December 28, 2018 Numerator: Net income $ 34,790 $ 26,949 Less: Undistributed earnings allocated to participating securities 857 653 Net income available to common shareholders $ 33,933 $ 26,296 Denominator: Basic weighted average common shares outstanding 47,126 46,995 Effect of dilutive securities: Non-participating employee stock options (1) 873 1,288 Diluted weighted average common shares outstanding 47,999 48,283 Basic earnings per share $ 0.72 $ 0.56 Diluted earnings per share $ 0.71 $ 0.54 (1) Stock options to purchase approximately 0.1 million and 0.6 million shares of common stock were outstanding during the three months ended December 27, 2019 and December 28, 2018, respectively, but were not included in the calculation of diluted earnings per share as the impact of these options would have been anti-dilutive.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	3 Months Ended
	Dec. 27, 2019
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Loss	The following table presents the changes in accumulated other comprehensive loss by component for the three months ended December 27, 2019 and December 28, 2018 . (in thousands) Defined benefit pension items Currency translation adjustments Total Balance as of September 30, 2019 $ (23,818 ) $ (17,880 ) $ (41,698 ) Other comprehensive loss before reclassifications — 5,109 5,109 Amounts reclassified from accumulated other 207 — 207 Net current period other comprehensive income 207 5,109 5,316 Balance as of December 27, 2019 $ (23,611 ) $ (12,771 ) $ (36,382 ) (in thousands) Defined benefit pension items Currency translation adjustments Total Balance as of September 30, 2018 $ (6,048 ) $ (10,390 ) $ (16,438 ) Other comprehensive loss before reclassifications — (2,746 ) (2,746 ) Amounts reclassified from accumulated other 25 — 25 Net current period other comprehensive income (loss) 25 (2,746 ) (2,721 ) Balance as of December 28, 2018 $ (6,023 ) $ (13,136 ) $ (19,159 )

Inventories, Net (Tables)

Inventories, Net (Tables)	3 Months Ended
	Dec. 27, 2019
Inventory Disclosure [Abstract]
Schedule of Inventory, Current	Interim LIFO determinations, including those at December 27, 2019 , are based on management's estimates of future inventory levels and costs for the remainder of the current fiscal year. (in thousands) December 27, 2019 September 30, 2019 Purchased materials and manufactured parts, net $ 53,141 $ 52,742 Work in process, net 24,678 21,424 Finished goods, net 164,871 151,924 Inventories, net $ 242,690 $ 226,090

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	3 Months Ended
	Dec. 27, 2019
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	As of December 27, 2019 , and September 30, 2019 , property, plant and equipment at cost and accumulated depreciation were as follows: (in thousands) December 27, 2019 September 30, 2019 Land $ 20,058 $ 19,897 Buildings and related improvements 128,376 127,061 Machinery and equipment 320,100 318,421 Leasehold improvements 8,916 9,055 Software 25,795 24,835 Construction in progress 22,487 21,264 Property, plant and equipment 525,732 520,533 Accumulated depreciation (270,507 ) (259,830 ) Property, plant and equipment, net $ 255,225 $ 260,703

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Dec. 27, 2019
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, 2019 $ 149,668 $ 36,563 $ 186,231 Exchange rate effects 1,874 — 1,874 Balance as of December 27, 2019 $ 151,542 $ 36,563 $ 188,105
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 27, 2019 September 30, 2019 ($ 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 11 $ 355,992 $ (179,950 ) $ 176,042 $ 353,256 $ (171,777 ) $ 181,479 Other 7 19,086 (8,260 ) 10,826 19,086 (7,761 ) 11,325 Total 375,078 (188,210 ) 186,868 372,342 (179,538 ) 192,804 Indefinite-lived intangible assets: Trade names 92,880 — 92,880 92,880 — 92,880 Total $ 467,958 $ (188,210 ) $ 279,748 $ 465,222 $ (179,538 ) $ 285,684
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 27, 2019 September 30, 2019 ($ 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 11 $ 355,992 $ (179,950 ) $ 176,042 $ 353,256 $ (171,777 ) $ 181,479 Other 7 19,086 (8,260 ) 10,826 19,086 (7,761 ) 11,325 Total 375,078 (188,210 ) 186,868 372,342 (179,538 ) 192,804 Indefinite-lived intangible assets: Trade names 92,880 — 92,880 92,880 — 92,880 Total $ 467,958 $ (188,210 ) $ 279,748 $ 465,222 $ (179,538 ) $ 285,684
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Expected amortization expense for intangible assets for the remainder of fiscal 2020 and over the next five years and thereafter is as follows: (in thousands) Remaining 2020 $ 25,854 2021 32,314 2022 30,980 2023 30,860 2024 26,403 2025 13,844 Thereafter 26,613

Debt (Tables)

Debt (Tables)	3 Months Ended
	Dec. 27, 2019
Debt Disclosure [Abstract]
Schedule of Debt	Debt as of December 27, 2019 and September 30, 2019 was as follows: (in thousands) December 27, 2019 September 30, 2019 First Lien Term Loan Facility due December 22, 2023 $ 851,406 $ 851,361 Deferred financing costs (6,163 ) (6,569 ) Other — 525 Total debt $ 845,243 $ 845,317 Less: Current portion — — Long-term debt $ 845,243 $ 845,317

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Dec. 27, 2019
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities	The following table presents the Company's assets and liabilities measured at fair value: December 27, 2019 September 30, 2019 (in thousands) Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Assets Cash equivalents $ 111,422 $ — $ — $ 72,132 $ — $ — Forward currency contracts — 297 — — 3,420 —
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 27, 2019 September 30, 2019 (in thousands) Carrying Value Fair Value Carrying Value Fair Value First Lien Term Loan Facility due December 22, 2023 $ 852,120 $ 854,677 $ 852,120 $ 853,543

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Dec. 27, 2019
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 27, 2019 December 28, 2018 Operating segment Adjusted EBITDA Electrical Raceway $ 70,193 $ 68,489 MP&S 16,654 10,887 Total 86,847 79,376 Unallocated expenses (a) (9,137 ) (9,353 ) Depreciation and amortization (18,730 ) (18,021 ) Interest expense, net (10,620 ) (12,160 ) Restructuring charges (220 ) (1,387 ) Stock-based compensation (3,123 ) (2,982 ) Transaction costs (51 ) (164 ) Other (b) (2,836 ) (206 ) Income before income taxes $ 42,130 $ 35,103 (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 27, 2019 December 28, 2018 (in thousands) External Net Sales Intersegment Sales Adjusted EBITDA External Net Sales Intersegment Sales Adjusted EBITDA Electrical Raceway $ 340,788 $ 588 $ 70,193 $ 343,215 $ 191 $ 68,489 MP&S 106,660 — 16,654 108,813 — 10,887 Eliminations — (588 ) — (191 ) Consolidated operations $ 447,448 $ — $ 452,028 $ —
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 ended December 27, 2019 and December 28, 2018 : Three months ended (in thousands) December 27, 2019 December 28, 2018 United States $ 396,141 $ 395,628 Other Americas 6,586 9,232 Europe 33,309 33,862 Asia-Pacific 11,412 13,306 Total $ 447,448 $ 452,028 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 ended December 27, 2019 and December 28, 2018 : Three months ended (in thousands) December 27, 2019 December 28, 2018 Metal Electrical Conduit and Fittings $ 123,842 131,247 Armored Cable and Fittings 83,823 84,345 PVC Electrical Conduit and Fittings 72,888 68,233 Cable Tray and Cable Ladders 50,246 45,774 Other raceway products 9,989 13,616 Electrical Raceway 340,788 343,215 Mechanical Pipe 58,331 60,668 Other MP&S products 48,329 48,145 MP&S 106,660 108,813 Net sales $ 447,448 $ 452,028

Leases - Additional Information

Leases - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Oct. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets	$ 42,812
Operating lease, liability	44,121
Lease, cost	3,914
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets		$ 45,519
Operating lease, liability		46,941
ASU 2016-02 modified retrospective adoption		(1,053)
Cost of sales
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease, cost	2,755
Selling, General and Administrative Expenses
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease, cost	$ 1,159
Accumulated Deficit | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
ASU 2016-02 modified retrospective adoption		$ (1,053)

Leases - Assets and Liabilities

Leases - Assets and Liabilities (Details) $ in Thousands	Dec. 27, 2019USD ($)
Operating And Finance Lease, Right-of-Use Assets [Abstract]
Operating lease assets	$ 42,812
Finance lease assets	3,962
Total right-of-use assets, gross	46,774
Less: accumulated depreciation and amortization	(2,632)
Right-of-use assets, net	44,142
Current liabilities:
Current portion of operating lease liabilities	12,149
Current portion of finance lease liabilities	456
Lease obligations	12,605
Noncurrent liabilities:
Operating lease liabilities	31,972
Finance lease liabilities	1,084
Long-term lease obligations	33,056
Total lease obligations	$ 45,661

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) $ in Thousands	3 Months Ended
	Dec. 27, 2019USD ($)
Leases [Abstract]
Amortization of right-of-use assets	$ 3,627
Interest on lease liabilities	8
Variable lease costs	39
Short term lease costs	240
Total lease costs	$ 3,914

Leases - Maturity of Lease Liab

Leases - Maturity of Lease Liabilities (Details) $ in Thousands	Dec. 27, 2019USD ($)
Finance Lease, Liability, Payment, Due [Abstract]
2020	$ 433
2021	412
2022	387
2023	295
2024	60
2025 and after	0
Total lease payments	1,587
Less: Interest	(47)
Present value of lease liabilities	1,540
Operating Leases
2020	13,950
2021	10,987
2022	8,496
2023	6,170
2024	4,929
2025 and after	6,143
Total lease payments	50,675
Less: Interest	(6,554)
Present value of lease liabilities	$ 44,121

Leases - Schedule of Minimum Fu

Leases - Schedule of Minimum Future Operating Lease Payments (Details) $ in Thousands	Sep. 30, 2019USD ($)
Leases [Abstract]
2020	$ 13,526
2021	11,592
2022	8,666
2023	6,362
2024	5,097
2025 and thereafter	6,938
Total	$ 52,181

Leases - Lease Term and Discoun

Leases - Lease Term and Discount Rate (Details)	Dec. 27, 2019
Weighted-average remaining lease term (years)
Operating leases	4 years 10 months 2 days
Finance leases	3 years 8 months 15 days
Weighted-average discount rate
Operating leases	4.34%
Finance leases	3.22%

Leases - Cash Flow Information

Leases - Cash Flow Information (Details) $ in Thousands	3 Months Ended
	Dec. 27, 2019USD ($)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 3,216
Operating cash flows from finance leases	4
Financing cash flows from finance leases	$ 128

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details) - USD ($) $ in Thousands	Aug. 21, 2019	Jun. 03, 2019	Oct. 01, 2018	Dec. 27, 2019	Sep. 30, 2019	Dec. 28, 2018
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired				$ 0		$ 57,899
Goodwill				$ 188,105	$ 186,231
Rocky Mountain Pipe (Cor-Tek)
Business Acquisition [Line Items]
Purchase price	$ 14,835
Business combination, bargain purchase, gain recognized, amount					7,384
United Structural Products, LLC.
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired		$ 25,507
Goodwill		7,295
Identifiable intangible assets		14,800
Working capital and other tangible assets		$ 3,412
Vergokan
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired			$ 57,899
Goodwill					$ 9,629

Acquisitions - Summary of Level

Acquisitions - Summary of Level 3 Fair Values Assigned to Net Assets Acquired and Liabilities Assumed As of Acquisition Date (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Dec. 27, 2019
Fair value of assets acquired and liabilities assumed:
Excess purchase price attributed to goodwill acquired	$ 186,231	$ 188,105
Vergokan
Fair value of consideration transferred:
Cash consideration	58,728
Other liability consideration	0
Total consideration transferred	58,728
Fair value of assets acquired and liabilities assumed:
Cash	829
Accounts receivable	8,761
Inventories	11,434
Intangible assets	12,621
Fixed assets	32,490
Accounts payable	(18,716)
Gain on purchase of business	0
Other	1,680
Net assets acquired	49,099
Excess purchase price attributed to goodwill acquired	9,629
Other
Fair value of consideration transferred:
Cash consideration	41,641
Other liability consideration	1,400
Total consideration transferred	43,041
Fair value of assets acquired and liabilities assumed:
Cash	1,541
Accounts receivable	8,217
Inventories	7,494
Intangible assets	16,400
Fixed assets	19,298
Accounts payable	(7,608)
Gain on purchase of business	(7,384)
Other	(3,412)
Net assets acquired	34,546
Excess purchase price attributed to goodwill acquired	8,495
Acquisitions For Fiscal Year 2019
Fair value of consideration transferred:
Cash consideration	100,369
Other liability consideration	1,400
Total consideration transferred	101,769
Fair value of assets acquired and liabilities assumed:
Cash	2,370
Accounts receivable	16,978
Inventories	18,928
Intangible assets	29,021
Fixed assets	51,788
Accounts payable	(26,324)
Gain on purchase of business	(7,384)
Other	(1,732)
Net assets acquired	83,645
Excess purchase price attributed to goodwill acquired	$ 18,124

Acquisitions - Summary of Fair

Acquisitions - Summary of Fair Value as of Acquisition Date (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2019USD ($)
Vergokan
Business Acquisition [Line Items]
Intangible assets	$ 12,621
Other
Business Acquisition [Line Items]
Intangible assets	16,400
Customer relationships | Vergokan
Business Acquisition [Line Items]
Fair Value	$ 10,535
Weighted Average Useful Life (Years)	12 years
Customer relationships | Other
Business Acquisition [Line Items]
Fair Value	$ 15,400
Weighted Average Useful Life (Years)	10 years
Other | Vergokan
Business Acquisition [Line Items]
Fair Value	$ 2,086
Weighted Average Useful Life (Years)	9 years
Other | Other
Business Acquisition [Line Items]
Fair Value	$ 1,000
Weighted Average Useful Life (Years)	9 years

Postretirement Benefits - Net P

Postretirement Benefits - Net Periodic Benefit Cost (Details) - Pension Plan - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 935	$ 1,166
Expected return on plan assets	(1,583)	(1,593)
Amortization of actuarial loss	222	25
Net periodic benefit credit	$ (426)	$ (402)

Restructuring Charges - Restruc

Restructuring Charges - Restructuring Reserves (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Sep. 30, 2018
Restructuring Reserve [Roll Forward]
Beginning balance	$ 537	$ 551
Charges	220		$ 3,804
Utilization	(342)		(3,818)
Exchange rate effects	14
Ending balance	429		551
One-time Termination Benefits
Restructuring Reserve [Roll Forward]
Charges	12	285
Facility Closing
Restructuring Reserve [Roll Forward]
Charges	208	1,080
Operating Segments | Electrical Raceway | Severance
Restructuring Reserve [Roll Forward]
Beginning balance	392	212
Charges	12		1,047
Utilization	(26)		(867)
Exchange rate effects	14
Ending balance	392		212
Operating Segments | Electrical Raceway | Other
Restructuring Reserve [Roll Forward]
Beginning balance	0	310
Charges	208		2,544
Utilization	(208)		(2,854)
Exchange rate effects	0
Ending balance	0		310
Operating Segments | MP&S | Severance
Restructuring Reserve [Roll Forward]
Beginning balance	145	0
Charges	0		213
Utilization	(108)		(68)
Exchange rate effects	0
Ending balance	37		0
Operating Segments | MP&S | Other
Restructuring Reserve [Roll Forward]
Beginning balance	0	$ 29
Charges	0		0
Utilization	0		(29)
Exchange rate effects	0
Ending balance	$ 0		$ 29

Restructuring Charges - As a Co

Restructuring Charges - As a Component of Selling, General and Administrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Restructuring and Related Activities [Abstract]
Total restructuring charges, net	$ 220	$ 1,387

Other Income, Net (Details)

Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Other Income and Expenses [Abstract]
Undesignated foreign currency derivative instruments	$ 3,123	$ (2,579)
Foreign exchange (gain) loss on intercompany loans	(2,931)	1,381
Pension-related benefits	(426)	(402)
Other income, net	$ (234)	$ (1,600)

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	17.40%	23.20%
Income tax expense	$ 7,340	$ 8,154

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Numerator:
Net income	$ 34,790	$ 26,949
Less: Undistributed earnings allocated to participating securities	857	653
Net income available to common shareholders	$ 33,933	$ 26,296
Denominator:
Weighted-average shares outstanding - Basic (in shares)	47,126	46,995
Effect of dilutive securities: Non-participating employee stock options (in shares)	873	1,288
Weighted-average shares outstanding - diluted (in shares)	47,999	48,283
Basic earnings per share (in dollars per share)	$ 0.72	$ 0.56
Diluted earnings per share (in dollars per share)	$ 0.71	$ 0.54

Earnings Per Share - Antidiluti

Earnings Per Share - Antidilutive Securities (Details) - shares shares in Millions	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
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)	0.1	0.6

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 232,936	$ 122,059
Other comprehensive loss before reclassifications	5,109	(2,746)
Amounts reclassified from accumulated other comprehensive loss	207	25
Total other comprehensive income (loss)	5,316	(2,721)
Balance at end of period	272,131	124,155
Defined benefit pension items
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(23,818)	(6,048)
Other comprehensive loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	207	25
Total other comprehensive income (loss)	207	25
Balance at end of period	(23,611)	(6,023)
Currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(17,880)	(10,390)
Other comprehensive loss before reclassifications	5,109	(2,746)
Amounts reclassified from accumulated other comprehensive loss	0	0
Total other comprehensive income (loss)	5,109	(2,746)
Balance at end of period	(12,771)	(13,136)
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(41,698)	(16,438)
Total other comprehensive income (loss)	5,316	(2,721)
Balance at end of period	$ (36,382)	$ (19,159)

Inventories, Net - Narrative (D

Inventories, Net - Narrative (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 30, 2019
Inventory Disclosure [Abstract]
Inventories at lower of LIFO cost or market	72.00%	72.00%
FIFO inventory amount	$ (2,639)	$ (3,138)
Excess and obsolete inventory reserve	$ (15,140)	$ (14,295)

Inventories, Net - Schedule of

Inventories, Net - Schedule of Inventory (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 30, 2019
Inventory Disclosure [Abstract]
Purchased materials and manufactured parts, net	$ 53,141	$ 52,742
Work in process, net	24,678	21,424
Finished goods, net	164,871	151,924
Inventories, net	$ 242,690	$ 226,090

Property, Plant and Equipment_2

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 525,732	$ 520,533
Accumulated depreciation	(270,507)	(259,830)
Property, plant and equipment, net	255,225	260,703
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	20,058	19,897
Buildings and related improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	128,376	127,061
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	320,100	318,421
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	8,916	9,055
Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment	25,795	24,835
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 22,487	$ 21,264

Property, Plant and Equipment -

Property, Plant and Equipment - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 10,617	$ 9,807

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Change in Carrying Amount (Details) $ in Thousands	3 Months Ended
	Dec. 27, 2019USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 186,231
Exchange rate effects	1,874
Balance at end of period	188,105
Electrical Raceway
Goodwill [Roll Forward]
Balance at beginning of period	149,668
Exchange rate effects	1,874
Balance at end of period	151,542
MP&S
Goodwill [Roll Forward]
Balance at beginning of period	36,563
Exchange rate effects	0
Balance at end of period	$ 36,563

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018	Oct. 01, 2019
Goodwill [Line Items]
Intangible asset amortization	$ 8,113	$ 8,214
Electrical Raceway
Goodwill [Line Items]
Accumulated impairment loss	3,924		$ 3,924
MP&S
Goodwill [Line Items]
Accumulated impairment loss	$ 43,000		$ 43,000

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Sep. 30, 2019
Amortizable intangible assets:
Gross Carrying Value	$ 375,078	$ 372,342
Accumulated Amortization	(188,210)	(179,538)
Net Carrying Value	186,868	192,804
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Carrying Value	467,958	465,222
Net Carrying Value	279,748	285,684
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	355,992	353,256
Accumulated Amortization	(179,950)	(171,777)
Net Carrying Value	$ 176,042	181,479
Customer relationships | Weighted Average Useful Life (Years)
Amortizable intangible assets:
Weighted Average Useful Life (Years)	11 years
Other
Amortizable intangible assets:
Gross Carrying Value	$ 19,086	19,086
Accumulated Amortization	(8,260)	(7,761)
Net Carrying Value	$ 10,826	$ 11,325
Other | Weighted Average Useful Life (Years)
Amortizable intangible assets:
Weighted Average Useful Life (Years)	7 years

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Future Amortization Expense (Details) (Details) $ in Thousands	Dec. 27, 2019USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Remaining 2020	$ 25,854
2021	32,314
2022	30,980
2023	30,860
2024	26,403
2025	13,844
Thereafter	$ 26,613

Debt - Schedule of Debt (Detail

Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 30, 2019
Debt Instrument [Line Items]
Deferred financing costs	$ (6,163)	$ (6,569)
Other	0	525
Total debt	845,243	845,317
Less: Current portion	0	0
Long-term debt	845,243	845,317
Secured Debt | First Lien Term Loan Facility due December 22, 2023
Debt Instrument [Line Items]
First Lien Term Loan Facility due December 22, 2023	$ 851,406	$ 851,361

Debt - ABL Credit Facility - Na

Debt - ABL Credit Facility - Narrative (Details) - Atkore International - Line of credit - ABL Credit Facility - USD ($)	Dec. 27, 2019	Sep. 30, 2019
Debt Instrument [Line Items]
Aggregate commitments	$ 325,000,000
Credit availability	$ 282,628,000	$ 301,882,000

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - GBP (£) £ in Millions	3 Months Ended
	Dec. 27, 2019	Sep. 30, 2019
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Forward currency contracts	£ 45	£ 45
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

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measures On a Gross Basis (Details) - Fair Value, Measurements, Recurring $ in Thousands, £ in Millions	Dec. 27, 2019USD ($)	Dec. 27, 2019GBP (£)	Sep. 30, 2019USD ($)	Sep. 30, 2019GBP (£)
Assets
Forward currency contracts | £		£ 45		£ 45
Level 1
Assets
Cash equivalents	$ 111,422		$ 72,132
Forward currency contracts	0		0
Level 2
Assets
Cash equivalents	0		0
Forward currency contracts	297		3,420
Level 3
Assets
Cash equivalents	0		0
Forward currency contracts	$ 0		$ 0

Fair Value Measurements - Estim

Fair Value Measurements - Estimated Fair Value (Details) - Secured Debt - First Lien Term Loan Facility due December 22, 2023 - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	$ 852,120	$ 852,120
Fair Value	$ 854,677	$ 853,543

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	Dec. 27, 2019	Sep. 30, 2019
Loss Contingencies [Line Items]
Purchase obligations for rest of fiscal year	$ 211,046
Purchase obligations for year two	976
Total settlement for prior cap agreement deductible	13,000
Special Products Claims and Other Product Liabilities
Loss Contingencies [Line Items]
Product liability	2,577	$ 2,424
Special Products Claims and Other Product Liabilities | Minimum
Loss Contingencies [Line Items]
Probable losses	1,000
Special Products Claims and Other Product Liabilities | Maximum
Loss Contingencies [Line Items]
Probable losses	8,000
Special Products Claims
Loss Contingencies [Line Items]
Total settlement for cap agreement deductible	$ 12,000

Guarantees - Narrative (Details

Guarantees - Narrative (Details) $ in Thousands	Dec. 27, 2019USD ($)
Supporting workers compensation
Guarantor Obligations [Line Items]
Guarantees	$ 9,501
Surety bond
Guarantor Obligations [Line Items]
Guarantees	$ 18,498

Segment Information - Narrative

Segment Information - Narrative (Details)	3 Months Ended
	Dec. 27, 2019segment
Segment Reporting [Abstract]
Number of operating segments	2

Segment Information - Shared As

Segment Information - Shared Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Segment Reporting Information [Line Items]
Net sales	$ 447,448	$ 452,028
Operating segment Adjusted EBITDA	86,847	79,376
Electrical Raceway
Segment Reporting Information [Line Items]
Net sales	340,788	343,215
MP&S
Segment Reporting Information [Line Items]
Net sales	106,660	108,813
Intersegment Sales
Segment Reporting Information [Line Items]
Net sales	(588)	(191)
Intersegment Sales | Electrical Raceway
Segment Reporting Information [Line Items]
Net sales	588	191
Intersegment Sales | MP&S
Segment Reporting Information [Line Items]
Net sales	0	0
Operating Segments | Electrical Raceway
Segment Reporting Information [Line Items]
Operating segment Adjusted EBITDA	70,193	68,489
Operating Segments | MP&S
Segment Reporting Information [Line Items]
Operating segment Adjusted EBITDA	$ 16,654	$ 10,887

Segment Information - Reconcili

Segment Information - Reconciliation of Operating Segment Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Segment Reporting Information [Line Items]
Operating segment Adjusted EBITDA	$ 86,847	$ 79,376
Unallocated expenses	(9,137)	(9,353)
Depreciation and amortization	(18,730)	(18,021)
Interest expense, net	(10,620)	(12,160)
Restructuring charges	(220)	(1,387)
Stock-based compensation	(3,123)	(2,982)
Transaction costs	(51)	(164)
Other	(2,836)	(206)
Income before income taxes	42,130	35,103
Operating Segments | Electrical Raceway
Segment Reporting Information [Line Items]
Operating segment Adjusted EBITDA	70,193	68,489
Operating Segments | MP&S
Segment Reporting Information [Line Items]
Operating segment Adjusted EBITDA	$ 16,654	$ 10,887

Segment Information - Net Sales

Segment Information - Net Sales by Geography (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 447,448	$ 452,028
United States
Disaggregation of Revenue [Line Items]
Net sales	396,141	395,628
Other Americas
Disaggregation of Revenue [Line Items]
Net sales	6,586	9,232
Europe
Disaggregation of Revenue [Line Items]
Net sales	33,309	33,862
Asia-Pacific
Disaggregation of Revenue [Line Items]
Net sales	$ 11,412	$ 13,306

Segment Information - Net Sal_2

Segment Information - Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 447,448	$ 452,028
Electrical Raceway
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	340,788	343,215
MP&S
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	106,660	108,813
Metal Electrical Conduit and Fittings | Electrical Raceway
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	123,842	131,247
Armored Cable and Fittings | Electrical Raceway
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	83,823	84,345
PVC Electrical Conduit and Fittings | Electrical Raceway
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	72,888	68,233
Cable Tray and Cable Ladders | Electrical Raceway
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	50,246	45,774
Other raceway products | Electrical Raceway
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	9,989	13,616
Mechanical Pipe | MP&S
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	58,331	60,668
Other MP&S products | MP&S
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 48,329	$ 48,145