Beacon Roofing Supply (BECN) 10-Q8 Feb 192019 Q1 Quarterly reportFinancial data

Company Profile

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Dec. 31, 2018	Jan. 31, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,019
Document Fiscal Period Focus	Q1
Trading Symbol	BECN
Entity Registrant Name	BEACON ROOFING SUPPLY INC
Entity Central Index Key	1,124,941
Current Fiscal Year End Date	--09-30
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		68,438,361

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 18,423	$ 129,927	$ 63,827
Restricted cash			1,300,000
Accounts receivable, less allowance of $21,353, $17,584 and $13,470 as of December 31, 2018, September 30, 2018 and December 31, 2017, respectively	881,749	1,090,533	552,703
Inventories, net	1,025,310	936,047	603,793
Prepaid expenses and other current assets	375,598	244,360	218,718
Total current assets	2,301,080	2,400,867	2,739,041
Property and equipment, net	273,742	280,407	154,687
Goodwill	2,489,730	2,491,779	1,251,825
Intangibles, net	1,282,242	1,334,366	410,857
Other assets, net	1,243	1,243	8,868
Total assets	6,348,037	6,508,662	4,565,278
Current liabilities:
Accounts payable	551,940	880,872	315,442
Accrued expenses	375,672	611,539	266,049
Current portions of long-term debt/obligations	20,315	19,661	14,239
Total current liabilities	947,927	1,512,072	595,730
Borrowings under revolving lines of credit, net	503,216	92,442
Long-term debt, net	2,497,123	2,494,725	2,000,059
Deferred income taxes, net	110,179	106,994	93,451
Long-term obligations under equipment financing and other, net	10,689	13,639	20,951
Other long-term liabilities	5,532	5,290	2,743
Total liabilities	4,074,666	4,225,162	2,712,934
Commitments and contingencies (Note 9)
Convertible preferred stock; $0.01 par value; aggregate liquidation preference $400,000; 400,000 shares authorized, issued and outstanding as of December 31, 2018 and September 30, 2018; none authorized, issued or outstanding as of December 31, 2017	399,195	399,195
Stockholders' equity:
Common stock (voting); $0.01 par value; 100,000,000 shares authorized; 68,432,707, 68,135,790, and 67,972,383 shares issued and outstanding as of December 31, 2018, September 30, 2018 and December 31, 2017, respectively	684	681	679
Undesignated preferred stock; 5,000,000 shares authorized, none issued or outstanding	0	0	0
Additional paid-in capital	1,067,711	1,067,040	1,050,389
Retained earnings	826,941	833,834	815,782
Accumulated other comprehensive income (loss)	(21,160)	(17,250)	(14,506)
Total stockholders' equity	1,874,176	1,884,305	1,852,344
Total liabilities and stockholders' equity	$ 6,348,037	$ 6,508,662	$ 4,565,278

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Accounts receivable, allowances	$ 21,353	$ 17,584	$ 13,470
Convertible preferred stock, par value	$ 0.01	$ 0.01
Convertible preferred stock. aggregate liquidation preference	$ 400,000	$ 400,000
Convertible preferred stock, shares authorized	400,000	400,000	0
Convertible preferred stock, shares issued	400,000	400,000	0
Convertible preferred stock, shares outstanding	400,000	400,000	0
Common stock (voting), par value	$ 0.01	$ 0.01	$ 0.01
Common stock (voting), shares authorized	100,000,000	100,000,000	100,000,000
Common Stock (Voting), issued	68,432,707	68,135,790	67,972,383
Common Stock (voting), outstanding	68,432,707	68,135,790	67,972,383
Undesignated Preferred Stock, shares authorized	5,000,000	5,000,000	5,000,000
Undesignated Preferred Stock, issued	0	0	0
Undesignated Preferred Stock, outstanding	0	0	0

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales		$ 1,721,676	$ 1,121,979
Cost of products sold		1,286,107	852,226
Gross profit		435,569	269,753
Operating expense:
Selling, general and administrative		327,693	193,753
Depreciation		17,601	8,709
Amortization		52,021	18,195
Total operating expense		397,315	220,657
Income (loss) from operations		38,254	49,096
Interest expense, financing costs, and other		38,361	22,568
Income (loss) before provision for income taxes		(107)	26,528
Provision for (benefit from) income taxes	[1]	786	(41,068)
Net income (loss)		(893)	67,596
Dividends on preferred shares	[2]	6,000	0
Net income (loss) attributable to common shareholders		$ (6,893)	$ 67,596
Weighted-average common stock outstanding:
Basic		68,248,020	67,825,430
Diluted		68,248,020	69,244,678
Net income (loss) per share:
Basic	[3]	$ (0.10)	$ 1
Diluted	[3]	$ (0.10)	$ 0.98

[1]	Three months ended December 31, 2017 amount includes a $46.5 million non-recurring net tax benefit resulting from the enactment of the 2017 Tax Cuts and Jobs Act (“TCJA”). As of December 31, 2018, the Company had completed its analysis of the impact of the TCJA in accordance with SEC Staff Accounting Bulletin No. 118. There were no adjustments to the provisional amounts during the three months ended December 31, 2018.
[2]	Three months ended December 31, 2018 amount is composed of $5.0 million in undeclared cumulative Preferred Stock dividends as well as an additional $1.0 million of Preferred Stock dividends that had been declared and paid as of period end. See Note 3 for further discussion.
[3]	See Note 5 for detailed calculations and further discussion.

Consolidated Statements of Op_2

Consolidated Statements of Operations (Parenthetical) - USD ($)	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Cumulative preferred stock dividends undeclared	$ 5,000,000
Adjustments to provisional amounts	0
Preferred stock dividends declared and paid	$ 1,000,000
Net income tax benefit,non recurring		$ 46,500,000

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (893)	$ 67,596
Other comprehensive income (loss):
Foreign currency translation adjustment	(3,910)	57
Total other comprehensive income (loss)	(3,910)	57
Comprehensive income (loss)	$ (4,803)	$ 67,653

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Sep. 30, 2017		$ 1,781,806	$ 677	$ 1,047,506	$ 748,186	$ (14,563)
Balance (in shares) at Sep. 30, 2017			67,700,858
Issuance of common stock, net of shares withheld for taxes		(145)	$ 2	(147)
Issuance of common stock, net of shares withheld for taxes (Shares)			271,525
Issuance costs related to secondary offering of common stock		(429)		(429)
Stock-based compensation		3,459		3,459
Other comprehensive income (loss)		57				57
Net income (loss)		67,596			67,596
Balance at Dec. 31, 2017		1,852,344	$ 679	1,050,389	815,782	(14,506)
Balance (in shares) at Dec. 31, 2017			67,972,383
Balance at Sep. 30, 2018		1,884,305	$ 681	1,067,040	833,834	(17,250)
Balance (in shares) at Sep. 30, 2018			68,135,790
Issuance of common stock, net of shares withheld for taxes		(2,783)	$ 3	(2,786)
Issuance of common stock, net of shares withheld for taxes (Shares)			296,917
Stock-based compensation		3,457		3,457
Other comprehensive income (loss)		(3,910)				(3,910)
Net income (loss)		(893)			(893)
Dividends on preferred shares	[1]	(6,000)			(6,000)
Balance at Dec. 31, 2018		$ 1,874,176	$ 684	$ 1,067,711	$ 826,941	$ (21,160)
Balance (in shares) at Dec. 31, 2018			68,432,707

[1]	Amount represents dividends that have been declared and paid during the three months ended December 31, 2018.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net income (loss)	$ (893)	$ 67,596
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	69,622	26,904
Stock-based compensation	3,457	3,459
Certain interest expense and other financing costs	3,024	707
Beneficial lease amortization	572	0
Gain on sale of fixed assets	(265)	(319)
Deferred income taxes	3,201	(44,923)
Changes in operating assets and liabilities, net of the effects of businesses acquired:
Accounts receivable	207,119	151,365
Inventories	(90,712)	(52,024)
Prepaid expenses and other assets	(131,638)	(1,421)
Accounts payable and accrued expenses	(400,616)	(191,800)
Other liabilities	246	0
Net cash provided by (used in) operating activities	(336,883)	(40,456)
Investing Activities
Purchases of property and equipment	(11,688)	(7,416)
Acquisition of businesses, net	(163,973)	0
Proceeds from the sale of assets	401	413
Net cash provided by (used in) investing activities	(175,260)	(7,003)
Financing Activities
Borrowings under revolving lines of credit	1,298,654	17,402
Repayments under revolving lines of credit	(888,225)	(20,548)
Borrowings under senior notes	0	1,300,000
Payment of debt issuance costs	0	(21,917)
Repayments under equipment financing facilities and other	(1,465)	(1,968)
Payment of stock issuance costs	0	(429)
Payment of dividends on preferred stock	(6,000)	0
Proceeds from issuance of common stock related to equity awards	834	3,781
Taxes paid related to net share settlement of equity awards	(3,617)	(3,925)
Net cash provided by (used in) financing activities	400,181	1,272,396
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	458	640
Net increase (decrease) in cash, cash equivalents, and restricted cash	(111,504)	1,225,577
Cash, cash equivalents, and restricted cash, beginning of period	129,927	138,250
Cash, cash equivalents, and restricted cash, end of period	18,423	1,363,827
Cash paid during the period for:
Interest	57,732	26,781
Income taxes, net of tax refunds	$ 1,239	$ 22,130

Company Overview

Company Overview	3 Months Ended
Company Overview	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Company Overview	1. Company Overview Beacon Roofing Supply, Inc. (the “Company”) was incorporated in the state of Delaware on August 22, 1997 and is the largest publicly traded distributor of residential and non-residential roofing materials and complementary building products in the United States and Canada. On January 2, 2018, the Company completed the acquisition of all the outstanding capital stock of Allied Building Products Corp. (“Allied”), a New Jersey corporation, for $2.625 billion, subject to certain working capital and other adjustments. Allied engages in the distribution of roofing materials, drywall, ceiling tile, and related accessories in the United States and was a wholly-owned subsidiary of Oldcastle Distribution, Inc. (see Note 3 for further discussion). The Company operates its business under regional and local trade names and, as of December 31, 2018, the Company serviced customers in all 50 states within the United States and 6 provinces in Canada. The Company’s material subsidiaries are Beacon Sales Acquisition, Inc., and Beacon Roofing Supply Canada Company.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Basis of Presentation The Company prepared the condensed consolidated financial statements in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the requirements of the Securities and Exchange Commission (“SEC”). As permitted under those rules, certain footnotes or other financial information have been condensed or omitted. Certain prior period amounts have been reclassified to conform to current period presentation. The balance sheet as of December 31, 2017 has been presented for a better understanding of the impact of seasonal fluctuations on the Company’s financial condition. In management’s opinion, the financial statements include all normal and recurring adjustments that are considered necessary for the fair presentation of the Company’s financial position and operating results. The results for the three months ended December 31, 2018 are not necessarily indicative of the results to be expected for the twelve months ending September 30, 2019 (“fiscal year 2019” or “2019”). The three-month periods ended December 31, 2018 and 2017 had 62 and 61 business days, respectively. These interim Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto contained in the Company’s fiscal year 2018 (“2018”) Annual Report on Form 10-K for the year ended September 30, 2018. Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in these consolidated financial statements and accompanying notes. Significant items subject to such estimates include inventories, purchase price allocations, recoverability of goodwill and intangibles, and income taxes. Actual amounts could differ from those estimates. Recent Accounting Pronouncements—Adopted In May 2014, the FASB issued ASU 2014-09, “ Revenue from Contracts with Customers In January 2017, the FASB issued ASU 2017-01, “ Business Combinations: Clarifying the Definition of a Business.” In May 2017, the FASB issued ASU 2017-09, “Scope of Modification Accounting.” Recent Accounting Pronouncements—Not Yet Adopted In February 2016, the FASB issued ASU 2016-02, “ Leases In June 2016, the FASB issued ASU 2016-13, “ Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments.” In January 2017, the FASB issued ASU 2017-04, “ Simplifying the Accounting for Goodwill Impairment.” In February 2018, the FASB issued ASU 2018-02, “Income Statement – Reporting Comprehensive Income.”

Acquisitions

Acquisitions	3 Months Ended
Acquisitions	Dec. 31, 2018
Business Combinations [Abstract]
Acquisitions	3. Acquisitions Allied Building Products Corp. On January 2, 2018 (the “Closing Date”), the Company completed its acquisition of all the outstanding capital stock of Allied (the “Allied Acquisition”), pursuant to a certain stock purchase agreement dated August 24, 2017 (the “Stock Purchase Agreement”), among the Company, Oldcastle, Inc., as parent, and Oldcastle Distribution, Inc., as seller, for approximately $2.625 billion in cash, subject to a working capital and certain other adjustments as set forth in the Stock Purchase Agreement (the “Purchase Price”). As of December 31, 2018, the adjusted Purchase Price for Allied was $2.88 billion, including increases of (i) $164.0 million related to the impact of the Section 338(h)(10) election under the current U.S. tax code and (ii) $88.1 million from a recorded net working capital adjustment. In connection with the Allied Acquisition, on the Closing Date the Company entered into (i) a new term loan agreement with Citibank, N.A., providing for a term loan B facility with an initial commitment of $970.0 million and (ii) an amended and restated credit agreement with Wells Fargo Bank, N.A., providing for a senior secured asset-based revolving credit facility with an initial commitment of $1.30 billion. Base borrowing rates on these facilities are at LIBOR plus 1.25% and LIBOR plus 2.25%, respectively. In connection with the Allied Acquisition, on the Closing Date, the Company completed the sale of 400,000 shares of Series A Cumulative Convertible Participating Preferred Stock, par value $0.01 per share (the “Preferred Stock”), with an aggregate liquidation preference of $400.0 million, at a purchase price of $1,000 per share, to CD&R Boulder Holdings, L.P., pursuant to a certain investment agreement, dated as of August 24, 2017, with CD&R Boulder Holdings, L.P. and Clayton, Dubilier & Rice Fund IX, L.P. (solely for the purpose of limited provisions therein) (the “Convertible Preferred Stock Purchase”). The $400.0 million in proceeds from the Convertible Preferred Stock Purchase were used to finance, in part, the Purchase Price. The Preferred Stock is convertible perpetual participating preferred stock of the Company, and conversion of the Preferred Stock into $0.01 par value shares of the Company’s common stock will be at a conversion price of $41.26 per share. The Preferred Stock accumulates dividends at a rate of 6.0% per annum (payable in cash or in-kind, subject to certain conditions). The Preferred Stock is not mandatorily redeemable; therefore, it is classified as mezzanine equity on the Company’s consolidated balance sheets and has a balance of $399.2 million (the $400.0 million proceeds received on the Closing Date, net of $0.8 million of unamortized issuance costs) as of December 31, 2018. Allied’s results of operations have been included with Company’s consolidated results beginning January 2, 2018. Allied distributed products in 208 locations across 31 states as of the date of the close. The Allied Acquisition has been accounted for as a business combination in accordance with the requirements of ASC 805, “ Business Combinations January 2, 2018 January 2, 2018 (as reported at March 31, 2018) Adjustments (as adjusted at December 31, 2018) Cash $ 19,322 $ (19,153 ) $ 169 Accounts receivable 315,485 22,064 337,549 Inventory 322,705 (7,920 ) 314,785 Prepaid and other current assets 59,279 16,161 75,440 Property, plant, and equipment 139,528 (168 ) 139,360 Goodwill 1,130,635 102,145 1,232,780 Intangible assets 1,037,000 - 1,037,000 Current liabilities (271,252 ) 11,963 (259,289 ) Non-current liabilities (6,820 ) 6,097 (723 ) Total purchase price $ 2,745,882 $ 131,189 $ 2,877,071 The purchase accounting entries above include the impact of the Section 338(h)(10) election under the current U.S. tax code. The Company made this election on October 15, 2018 and has reflected the $164.0 million impact of this election in the purchase price and its fiscal year 2018 tax provision accordingly. The Company determined that $1.16 billion of goodwill related to the acquisition of Allied is deductible for tax purposes as of December 31, 2018. The Company’s goodwill and indefinite-lived trade name are tested for impairment annually, and all acquired goodwill and intangible assets are subject to review for impairment should future indicators of impairment develop. There were no material contingencies assumed as part of the Allied acquisition. The following table represents the unaudited pro forma consolidated net sales and net income (loss) for the Company for the periods indicated (in thousands): Three Months Ended December 31, 2017 (unaudited) Net sales $ 1,787,628 Net income (loss) 32,257 The above pro forma results have been calculated by combining the historical results of the Company and Allied as if the Allied Acquisition had occurred on the first day of the fiscal year (October 1) for the period presented. The income tax provision used to calculate net income (loss) for the respective periods presented has been adjusted to reflect the effective tax rate for the annual periods as if it had been based on the resulting, combined results. The pro forma results include estimates for intangible asset amortization, depreciation, interest expense and debt issuance costs and are subject to change once final asset values have been determined. No other material pro forma adjustments were deemed necessary to conform to the Company’s accounting policies or for any other situation. The pro forma information is not necessarily indicative of the results that would have been achieved had the transactions occurred on the first day of the fiscal years presented or that may be achieved in the future. Additional Acquisitions – Fiscal Year 2018 During fiscal year 2018, the Company acquired 7 branches from the following acquisitions: • On May 1, 2018, the Company acquired Tri-State Builder’s Supply, a wholesale supplier of roofing, siding, windows, doors and related building products with 1 branch located in Duluth, Minnesota and annual sales of approximately $6 million. • On July 16, 2018, the Company acquired Atlas Supply, Inc., the Pacific Northwest’s leading distributor of sealants, coatings, adhesives and related waterproofing products, with 6 branches operating in Seattle, Tacoma, Spokane, and Mountlake Terrace in Washington, as well as locations in Portland, Oregon and Boise, Idaho, and annual sales of approximately $37 million. The Company has recorded purchase accounting entries on a preliminary basis for these transactions that recognized the acquired assets and liabilities at their estimated fair values as of the respective acquisition dates. These transactions resulted in goodwill of $7.6 million ($7.4 million of which is deductible for tax purposes as of December 31, 2018) and $11.4 million in intangible assets For those acquisitions where the acquisition accounting entries have yet to be finalized, the Company’s allocation of the purchase price is subject to change on receipt of additional information, including, but not limited to, the finalization of asset valuations (intangible and fixed) and income tax accounting, as well as the Company’s continued review of the assumed liabilities that may result in the recognition of changes to the carrying amounts on the opening balance sheet and a related adjustment to goodwill.

Net Sales

Net Sales	3 Months Ended
Net Sales	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Net Sales	4. Net Sales The Company records net sales when performance obligations with our customer are satisfied. A performance obligation is a promise to transfer a distinct good to the customer and is the unit of account. The transaction price is allocated to each distinct performance obligation and recognized as net sales when, or as, the performance obligation is satisfied. All contracts have a single performance obligation as the promise to transfer the individual good is not separately identifiable from other promises and is, therefore, not distinct. Performance obligations are satisfied at a point in time and net sales are recognized when the customer accepts the delivery of a product or takes possession of a product with rights and rewards of ownership. The Company enters into agreements with customers to offer rebates, generally based on achievement of specified sales levels and various marketing allowances that are common industry practice. Reductions to net sales for customer programs and incentive offerings, including promotions and other volume-based incentives, are estimated using the most likely amount method and recorded in the period in which the sale occurs. Provisions for early payment discounts are accrued in the same period in which the sale occurs. The Company does not have any material payment terms as payment is received shortly after the transfer of control of the products to the customer. Commissions to internal sales teams are paid to obtain contracts. As these contracts are less than one year, these costs are expensed as incurred. The Company includes shipping and handling costs billed to customers in net sales. Related costs are accounted for as fulfillment activities and are recognized as cost of products sold when control of the products transfers to the customer. The following table presents the Company’s net sales by product line and geography for the three months ended December 31, 2018 (in thousands): Three Months Ended December 31, 2018 U.S. Canada Total Residential roofing products $ 720,511 $ 11,679 $ 732,190 Non-residential roofing products 390,268 29,641 419,909 Complementary building products 568,116 1,461 569,577 Total net sales $ 1,678,895 $ 42,781 $ 1,721,676

Net Income (Loss) Per Share

Net Income (Loss) Per Share	3 Months Ended
Net Income (Loss) Per Share	Dec. 31, 2018
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	5. Net Income (Loss) Per Share Basic net income (loss) per share is calculated by dividing net income (loss) attributable to common shareholders by the weighted-average number of common shares outstanding during the period, without consideration for common share equivalents or the conversion of Preferred Stock. Common share equivalents consist of the incremental common shares issuable upon the exercise of stock options and vesting of restricted stock unit awards. Diluted net income (loss) per common share is calculated by dividing net income (loss) attributable to common shareholders by the fully diluted weighted-average number of common shares outstanding during the period. Holders of Preferred Stock participate in dividends on an as-converted basis when declared on common shares. As a result, Preferred Stock is classified as a participating security and thereby requires the allocation of income that would have otherwise been available to common shareholders when calculating net income (loss) per share. Diluted net income (loss) per share is calculated by utilizing the most dilutive result of the if-converted and two-class methods. In both methods, net income (loss) attributable to common shareholders and the weighted-average common shares outstanding are adjusted to account for the impact of the assumed issuance of potential common shares that are dilutive, subject to dilution sequencing rules. The following table presents the components and calculations of basic and diluted net income (loss) per share for each period presented (in thousands, except share and per share amounts): Three Months Ended December 31, 2018 2017 Net income (loss) $ (893 ) $ 67,596 Dividends on preferred shares (6,000 ) - Net income (loss) attributable to common shareholders $ (6,893 ) $ 67,596 Undistributed income allocated to participating securities - - Net income (loss) attributable to common shareholders - basic and diluted $ (6,893 ) $ 67,596 Weighted-average common shares outstanding - basic 68,248,020 67,825,430 Effect of common share equivalents - 1,419,248 Weighted-average common shares outstanding - diluted 68,248,020 69,244,678 Net income (loss) per share - basic $ (0.10 ) $ 1.00 Net income (loss) per share - diluted $ (0.10 ) $ 0.98 The following table includes the number of shares that may be dilutive common shares in the future. These shares were not included in the computation of diluted net income (loss) per share because the effect was either anti-dilutive or the requisite performance conditions were not met: Three Months Ended December 31, 2018 2017 Stock options 1,554,518 288,275 Restricted stock units 318,229 - Preferred Stock 9,694,619 -

Stock-based Compensation

Stock-based Compensation	3 Months Ended
Stock-based Compensation	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-based Compensation	6. Stock-based Compensation On February 9, 2016, the shareholders of the Company approved the Amended and Restated Beacon Roofing Supply, Inc. 2014 Stock Plan (the “2014 Plan”). The 2014 Plan provides for discretionary awards of stock options, stock awards, restricted stock units, and stock appreciation rights for up to 5,000,000 shares of common stock to selected employees and non-employee directors. The 2014 Plan mandates that all forfeited, expired, and withheld shares, including those from the predecessor plans, be returned to the 2014 Plan and made available for issuance. As of December 31, 2018, there were 1,772,191 shares of common stock available for issuance. Prior to the 2014 Plan, the Company maintained the amended and restated Beacon Roofing Supply, Inc. 2004 Stock Plan (the “2004 Plan”). Upon shareholder approval of the 2014 Plan, the Company ceased issuing equity awards from the 2004 Plan and mandated that all future equity awards will be issued from the 2014 Plan. For all equity awards granted prior to October 1, 2014, in the event of a change in control of the Company, all awards are immediately vested. Beginning in fiscal 2015, equity awards contained a “double trigger” change in control mechanism. Unless an award is continued or assumed by a public company in an equitable manner, an award shall become fully vested immediately prior to a change in control (at 100% of the grant target in the case of a performance-based restricted stock unit award). If an award is so continued or assumed, vesting will continue in accordance with the terms of the award, unless there is a qualifying termination within one-year following the change in control, in which event the award shall immediately become fully vested (at 100% of the grant target in the case of a performance-based restricted stock unit award). Stock Options Non-qualified stock options granted to employees generally expire 10 years after the grant date and are subject to continued employment and vest evenly in three annual installments over the three-year period following the grant date. The fair value of the options granted during the three months ended December 31, 2018 were estimated on the date of grant using the Black-Scholes option-pricing model with the following assumptions: Risk-free interest rate 3.00 % Expected volatility 29.34 % Expected life (in years) 5.18 Dividend yield - The following table summarizes all stock option activity for the three months ended December 31, 2018 (in thousands, except share, per share, and time period amounts): Options Outstanding Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (Years) Aggregate Intrinsic Value 1 Balance as of September 30, 2018 1,969,037 $ 33.08 5.7 $ 14,088 Granted 605,184 27.26 Exercised (48,800 ) 17.11 Canceled/Forfeited (12,967 ) 41.12 Expired (950 ) 12.25 Balance as of December 31, 2018 2,511,504 $ 31.96 6.6 $ 11,478 Vested and expected to vest after December 31, 2018 2,455,082 $ 31.94 6.5 $ 11,275 Exercisable as of December 31, 2018 1,645,162 $ 30.75 5.1 $ 8,511 ________________________________________________________________ 1 During the three months ended December 31, 2018 and 2017, the Company recorded stock-based compensation expense related to stock options of $1.0 million and $1.1 million, respectively. As of December 31, 2018, there was $8.1 million of unrecognized compensation cost related to unvested stock options, which is expected to be recognized over a weighted-average period of 2.3 years. The following table summarizes additional information on stock options for the periods presented (in thousands, except per share amounts): Three Months Ended December 31, 2018 2017 Weighted-average fair value of stock options granted $ 8.75 $ 15.86 Total grant date fair value of stock options vested 3,680 3,773 Total intrinsic value of stock options exercised 712 5,448 Restricted Stock Units Restricted stock unit (“RSU”) awards granted to employees are subject to continued employment and generally vest on the third anniversary of the grant date. The Company also grants certain RSU awards to management that contain one or more additional vesting conditions tied directly to a defined performance metric for the Company. The actual number of RSUs that will vest can range from 0% to 200% of the original grant amount, depending upon the terms of the award and actual Company performance above or below the established performance metric targets. The Company estimates performance in relation to the defined targets when determining the projected number of RSUs that are expected to vest and calculating the related stock-based compensation expense. RSUs granted to non-employee directors are subject to continued service and vest on the first anniversary of the grant date (except under certain conditions). Generally, the common shares underlying the RSUs are not eligible for distribution until the non-employee director’s service on the Board has terminated, and for non-employee director RSU grants made prior to fiscal year 2014, the share distribution date is six months after the director’s termination of service on the board. Beginning in fiscal year 2016, the Company enacted a policy that allows any non-employee directors who have Beacon equity holdings (defined as common stock and outstanding vested equity awards) with a total fair value that is greater than or equal to five times the annual Board cash retainer to elect to have any future RSU grants settle simultaneously with vesting. The following table summarizes all restricted stock unit activity for the three months ended December 31, 2018: RSUs Outstanding Weighted-Average Grant Date Fair Value Balance as of September 30, 2018 934,023 $ 47.00 Granted 630,745 27.28 Released (366,779 ) 40.46 Canceled/Forfeited (77,455 ) 47.52 Balance as of December 31, 2018 1,120,534 $ 38.00 Vested and expected to vest after December 31, 2018 1,040,181 $ 37.78 During the three months ended December 31, 2018 and 2017, the Company recorded stock-based compensation expense related to restricted stock units of $2.4 million and $2.4 million, respectively. As of December 31, 2018, there was $27.2 million of unrecognized compensation cost related to unvested restricted stock units, which is expected to be recognized over a weighted-average period of 2.3 years. The following table summarizes additional information on RSUs for the periods presented (in thousands, except per share amounts): Three Months Ended December 31, 2018 2017 Weighted-average fair value of RSUs granted $ 27.28 $ 55.17 Total grant date fair value of RSUs vested 14,840 5,786 Total intrinsic value of RSUs released 11,160 10,683

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
Goodwill and Intangible Assets	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	7. Goodwill and Intangible Assets Goodwill The following table sets forth the change in the carrying amount of goodwill during the three months ended December 31, 2018 and 2017, respectively (in thousands): Balance as of September 30, 2017 $ 1,251,986 Translation and other adjustments (161 ) Balance as of December 31, 2017 $ 1,251,825 Balance as of September 30, 2018 $ 2,491,779 Acquisitions 1 (513 ) Translation and other adjustments (1,536 ) Balance as of December 31, 2018 $ 2,489,730 _____________________________ 1 Reflects purchase accounting adjustments related to fiscal year 2018 acquisition of Atlas Supply, Inc. (see Note 3 for further discussion). The changes in the carrying amount of goodwill for the three months ended December 31, 2018 and 2017 were driven primarily by purchase accounting and foreign currency translation adjustments Intangible Assets In connection with transactions finalized during fiscal year 2018, the Company recorded intangible assets of $1.05 billion ($920.8 million of customer relationships, $120.0 million of indefinite-lived trademarks, and $7.0 million of beneficial lease arrangements). The following table summarizes intangible assets by category (in thousands, except time period amounts): December 31, 2018 September 30, 2018 December 31, 2017 Weighted-Average Remaining Life 1 (Years) Amortizable intangible assets: Non-compete agreements $ 2,824 $ 2,824 $ 2,824 2.47 Customer relationships 1,530,748 1,530,565 609,984 18.38 Trademarks 10,500 10,500 10,500 7.41 Beneficial lease arrangements 8,060 8,060 1,060 4.24 Total amortizable intangible assets 1,552,132 1,551,949 624,368 Accumulated amortization (462,940 ) (410,633 ) (286,561 ) Total amortizable intangible assets, net $ 1,089,192 $ 1,141,316 $ 337,807 Indefinite lived trademarks 193,050 193,050 73,050 Total intangibles, net $ 1,282,242 $ 1,334,366 $ 410,857 _________________________________________________________________ 1 As of December 31, 2018. For the three months ended December 31, 2018 and 2017, the Company recorded $52.0 million and $18.2 million of amortization expense relating to the above-listed intangible assets, respectively. The intangible asset lives range from 5 to 20 years and have a weighted-average remaining life of 18.2 years as of December 31, 2018. The following table summarizes the estimated future amortization expense for intangible assets (in thousands): Year Ending September 30, 2019 (Jan - Sept) $ 156,534 2020 179,541 2021 149,974 2022 121,426 2023 97,517 Thereafter 384,200 Total future amortization expense $ 1,089,192

Financing Arrangements

Financing Arrangements	3 Months Ended
Financing Arrangements	Dec. 31, 2018
Debt Disclosure [Abstract]
Financing Arrangements	8. Financing Arrangements The following table summarizes all financing arrangements from the respective periods presented (in thousands): December 31, 2018 September 30, 2018 December 31, 2017 Revolving Lines of Credit 2023 ABL: U.S. Revolver, expires January 2023 1 $ 496,619 $ 89,352 $ - Canada Revolver, expires January 2023 2 6,597 3,090 - Current portion - - - Borrowings under revolving lines of credit, net $ 503,216 $ 92,442 $ - Long-term Debt, net Term Loans: Term Loan, matures October 2022 3 $ - $ - $ 433,828 Term Loan, matures January 2025 4 932,102 930,726 - Current portion (9,700 ) (9,700 ) (4,500 ) Long-term borrowings under term loans 922,402 921,026 429,328 Senior Notes: Senior Notes, mature October 2023 5 293,926 293,607 292,648 Senior Notes, mature November 2025 6 1,280,795 1,280,092 1,278,083 Current portion - - - Long-term borrowings under senior notes 1,574,721 1,573,699 1,570,731 Long-term debt, net $ 2,497,123 $ 2,494,725 $ 2,000,059 Equipment Financing Facilities and Other Equipment financing facilities, various maturities through September 2021 7 $ 10,148 $ 11,222 $ 11,657 Capital lease obligations, various maturities through November 2021 8 11,156 12,378 19,033 Current portion (10,615 ) (9,961 ) (9,739 ) Long-term obligations under equipment financing and other, net $ 10,689 $ 13,639 $ 20,951 ____________________________________________________________ 1 Effective rate on borrowings of 4.37% and 3.36% as of December 31, 2018 and September 30, 2018, respectively. 2 Effective rate on borrowings of 4.45% and 3.95% as of December 31, 2018 and September 30, 2018, respectively. 3 Extinguished on January 2, 2018; Interest rate of 4.06% as of December 31, 2017. 4 Interest rate of 4.77% and 4.53% as of December 31, 2018 and September 30, 2018, respectively. 5 Interest rate of 6.38% as of December 31, 2018, September 30, 2017 and December 31, 2017. 6 Interest rate of 4.88% as of December 31, 2018, September 30, 2017 and December 31, 2017. 7 Fixed interest rates ranging from 2.33% to 3.25% as of December 31, 2018, September 30, 2017, and December 31, 2017. 8 Fixed interest rates ranging from 2.72% to 10.39% as of December 31, 2018 , September 30, 2017, and December 31, 2017. Financing - Allied Acquisition In connection with the Allied Acquisition, the Company entered into various financing arrangements totaling $3.57 billion, including an asset-based revolving line of credit of $1.30 billion (“2023 ABL”), $525.0 million of which was drawn at closing, and a $970.0 million term loan (“2025 Term Loan”). The Company also raised an additional $1.30 billion through the issuance of senior notes (the “2025 Senior Notes”). The proceeds from these financing arrangements were used to finance the Allied Acquisition, to refinance or otherwise extinguish all third-party indebtedness, to pay fees and expenses associated with the acquisition, and to provide working capital and funds for other general corporate purposes. The Company capitalized new debt issuance costs totaling approximately $65.3 million related to the 2023 ABL, the 2025 Term Loan and the 2025 Senior Notes. Since the financing arrangements entered into in connection with the Allied Acquisition had certain lenders who also participated in previous financing arrangements entered into by the Company, portions of the transactions were accounted for as either a debt modification or a debt extinguishment. In accordance with the accounting for debt modification, the Company expensed $2.0 million of debt issuance costs related to the Allied financing arrangements and recognized a loss on debt extinguishment of $1.7 million. The remainder of the debt issuance costs will be amortized over the term of the Allied financing arrangements. 2023 ABL On January 2, 2018, the Company entered into a $1.30 billion asset-based revolving line of credit with Wells Fargo Bank, N.A. and a syndicate of other lenders. The 2023 ABL consists of revolving loans in both the United States (“2023 U.S. Revolver”) in the amount of $1.20 billion and Canada (“2023 Canada Revolver”) in the amount of $100.0 million. The 2023 ABL has a maturity date of January 2, 2023. The 2023 ABL has various borrowing tranches with an interest rate based on a LIBOR rate (with a floor) plus a fixed spread. The current unused commitment fees on the 2023 ABL are 0.25% per annum. There is one financial covenant under the 2023 ABL, which is a Consolidated Fixed Charge Ratio. The Consolidated Fixed Charge Ratio is calculated by dividing consolidated earnings before interest, taxes, depreciation and amortization (EBITDA) by Consolidated Fixed Charges (both as defined in the agreement). Per the covenant, the Company’s Consolidated Fixed Charge Ratio must be a minimum of 1.00 at the end of each fiscal quarter, calculated on a trailing four quarter basis. The 2023 ABL is secured by a first priority lien over substantially all of the Company’s and each guarantor’s accounts, chattel paper, deposit accounts, books, records and inventory (as well as intangibles related thereto), subject to certain customary exceptions (the “ABL Priority Collateral”), and a second priority lien over substantially all of the Company’s and each guarantor’s other assets, including all of the equity interests of any subsidiary held by the Company or any guarantor, subject to certain customary exceptions (the “Term Priority Collateral”). The 2023 ABL is guaranteed jointly, severally, fully and unconditionally by the Company’s active United States subsidiaries. As of December 31, 2018, the total balance outstanding on the 2023 ABL, net of $10.0 million of unamortized debt issuance costs, was $503.2 million. The Company also has outstanding standby letters of credit related to the 2023 U.S. Revolver in the amount of $13.4 million as of December 31, 2018. 2025 Term Loan On January 2, 2018, the Company entered into a $970.0 million Term Loan with Citibank N.A., and a syndicate of other lenders. The 2025 Term Loan requires quarterly principal payments in the amount of $2.4 million, with the remaining outstanding principal to be paid on its January 2, 2025 maturity date. The interest rate is based on a LIBOR rate (with a floor) plus a fixed spread. The Company has the option of selecting a LIBOR period that determines the rate at which interest can accrue on the Term Loan as well as the period in which interest payments are made. The 2025 Term Loan is secured by a first priority lien on the Term Priority Collateral and a second priority lien on the ABL Priority Collateral. Certain excluded assets will not be included in the Term Priority Collateral and the ABL Priority Collateral. The Term Loan is guaranteed jointly, severally, fully and unconditionally by the Company’s active United States subsidiaries. As of December 31, 2018, the outstanding balance on the 2025 Term Loan, net of $33.0 million of unamortized debt issuance costs, was $932.1 million. 2025 Senior Notes On October 25, 2017, Beacon Escrow Corporation, a wholly owned subsidiary of the Company (the “Escrow Issuer”), completed a private offering of $1.30 billion aggregate principal amount of 4.875% Senior Notes due 2025 at an issue price of 100%. The 2025 Senior Notes bear interest at a rate of 4.875% per annum, payable semi-annually in arrears, beginning May 1, 2018. The Company anticipates repaying the 2025 Senior Notes at the maturity date of November 1, 2025. Per the terms of the Escrow Agreement, the net proceeds from the 2025 Senior Notes remained in escrow until they were used to fund a portion of the purchase price of the Allied Acquisition payable at closing on January 2, 2018. Upon closing of the Allied Acquisition on January 2, 2018, (i) the Escrow Issuer merged with and into the Company, and the Company assumed all obligations under the 2025 Senior Notes; and (ii) all existing domestic subsidiaries of the Company (including the entities acquired in the Allied Acquisition) became guarantors of the 2025 Senior Notes. As of December 31, 2018, the outstanding balance on the 2025 Senior Notes, net of $19.2 million of unamortized debt issuance costs, was $1.28 billion. Financing - RSG Acquisition In connection with the Roofing Supply Group (“RSG”) acquisition in fiscal year 2016, the Company entered into various financing arrangements totaling $1.45 billion, including an asset-based revolving line of credit (“2020 ABL”) of $700.0 million ($350.0 million of which was drawn at closing) and a $450.0 million term loan (“2022 Term Loan”). The Company also raised an additional $300.0 million through the issuance of senior notes (the “2023 Senior Notes”). The proceeds from these financing arrangements were used to provide working capital and funds for other general corporate purposes, to refinance or otherwise extinguish all third-party indebtedness for borrowed money under Company’s and RSG’s existing senior secured credit facilities and RSG’s unsecured senior notes due 2020, to finance the acquisition, and to pay fees and expenses associated with the RSG acquisition. The Company incurred debt issuance costs totaling approximately $31.3 million related to the 2020 ABL, 2022 Term Loan and 2023 Senior Notes. 2020 ABL On October 1, 2015, the Company entered into a $700.0 million asset-based revolving line of credit with Wells Fargo Bank, N.A. and a syndicate of other lenders. The 2020 ABL had an original maturity date of October 1, 2020 and consisted of revolving loans in both the United States, in the amount of $670.0 million, and Canada, in the amount of $30.0 million. The 2020 ABL had various borrowing tranches with an interest rate based on a LIBOR rate (with a floor) plus a fixed spread. The full balance of the 2020 ABL was paid on January 2, 2018 in conjunction with the Allied Acquisition. 2022 Term Loan On October 1, 2015, the Company entered into a $450.0 million Term Loan with Citibank N.A., and a syndicate of other lenders. The 2022 Term Loan required quarterly principal payments in the amount of $1.1 million, with the remaining outstanding principal to be paid on its original maturity date of October 1, 2022. The interest rate was based on a LIBOR rate (with a floor) plus a fixed spread. The Company had the option of selecting a LIBOR period that determined the rate at which interest would accrue, as well as the period in which interest payments are made. The full balance of the 2022 Term Loan was paid on January 2, 2018 in conjunction with the Allied Acquisition, including the write-off of $0.7 million in debt issuance costs. 2023 Senior Notes On October 1, 2015, the Company raised $300.0 million by issuing senior notes due 2023. The 2023 Senior Notes have a coupon rate of 6.38% per annum and are payable semi-annually in arrears, beginning April 1, 2016. There are early payment provisions in the indenture in which the Company would be subject to “make whole” provisions. The Company anticipates repaying the notes at the maturity date of October 1, 2023. The 2023 Senior Notes are guaranteed jointly, severally, fully and unconditionally by the Company’s active United States subsidiaries. As of December 31, 2018, the outstanding balance on the 2023 Senior Notes, net of $6.1 million of unamortized debt issuance costs, was $293.9 million. Equipment Financing Facilities and Other As of December 31, 2018, the Company had a $10.1 million outstanding under equipment financing facilities, with fixed interest rates ranging from 2.33% to 3.25% and payments due through September 2021. As of December 31, 2018, the Company had $11.2 million of capital lease obligations outstanding. These leases have interest rates ranging from 2.72% to 10.39% with payments due through November 2021.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	9. Commitments and Contingencies Operating Leases The Company mostly operates in leased facilities, which are accounted for as operating leases. The leases typically provide for a base rent plus real estate taxes. Certain of the leases provide for escalating rents over the lives of the leases and rent expense is recognized over the terms of those leases on a straight-line basis. At December 31, 2018, the minimum rental commitments under all non-cancelable operating leases with initial or remaining terms of more than one year were as follows (in thousands): Year Ending September 30, 2019 (Jan - Sept) $ 110,514 2020 101,743 2021 90,734 2022 71,869 2023 55,048 Thereafter 146,410 Total minimum lease payments $ 576,318 For the three months ended December 31, 2018 and 2017, rent expense was $27.5 million and $15.2 million, respectively. Sublet income was immaterial for each of these periods. Contingencies The Company is subject to loss contingencies pursuant to various federal, state and local environmental laws and regulations; however, the Company is not aware of any reasonably possible losses that would have a material impact on its results of operations, financial position, or liquidity. Potential loss contingencies include possible obligations to remove or mitigate the effects on the environment of the placement, storage, disposal or release of certain chemical or other substances by the Company or by other parties. In connection with its acquisitions, the Company’s practice is to request indemnification for any and all known material liabilities of significance as of the respective dates of acquisition. Historically, environmental liabilities have not had a material impact on the Company’s results of operations, financial position or liquidity. The Company is subject to litigation from time to time in the ordinary course of business; however, the Company does not expect the results, if any, to have a material adverse impact on its results of operations, financial position or liquidity.

Geographic Data

Geographic Data	3 Months Ended
Geographic Data	Dec. 31, 2018
Segment Reporting [Abstract]
Geographic Data	10. Geographic Data The following table summarizes certain geographic information for the periods presented (in thousands): December 31, 2018 September 30, 2018 December 31, 2017 Long-lived assets: U.S. $ 1,352,081 $ 1,409,742 $ 488,137 Canada 12,096 13,224 13,225 Total long-lived assets $ 1,364,177 $ 1,422,966 $ 501,362

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
Accumulated Other Comprehensive Income (Loss)	Dec. 31, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	11. Accumulated Other Comprehensive Income (Loss) Other comprehensive income (loss) is composed of certain gains and losses that are excluded from net income under GAAP and instead recorded as a separate element of stockholders’ equity. For the three months ended December 31, 2018, the change in accumulated other comprehensive income (loss) was $(3.9) million and composed solely of foreign currency translation effects. There were no reclassifications out of accumulated other comprehensive income (loss) for the three months ended December 31, 2018.

Fair Value Measurement

Fair Value Measurement	3 Months Ended
Fair Value Measurement	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurement	12. Fair Value Measurement As of December 31, 2018, the carrying amount of cash and cash equivalents, accounts receivable, prepaid and other current assets, accounts payable and accrued expenses approximated fair value because of the short-term nature of these instruments. The Company measures its cash equivalents at amortized cost, which approximates fair value based upon quoted market prices (Level 1). As of December 31, 2018, based upon recent trading prices (Level 2), the fair value of the Company’s $300.0 million Senior Notes due in 2023 was $299.3 million and the fair value of the $1.30 billion Senior Notes due 2025 was $1.15 billion. As of December 31, 2018, the fair value of the Company’s term loan and revolving asset-based line of credit approximated the amount outstanding. The Company estimates the fair value of its Senior Secured Credit Facility by discounting the future cash flows of each instrument using estimated market rates of debt instruments with similar maturities and credit profiles (Level 3).

Supplemental Guarantor Informat

Supplemental Guarantor Information	3 Months Ended
Supplemental Guarantor Information	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Supplemental Guarantor Information	13. Supplemental Guarantor Information The 2023 Senior Notes and 2025 Senior Notes are guaranteed jointly and severally by all the United States subsidiaries of the Company (collectively, the “Guarantors”), and not by the Canadian subsidiaries of the Company. Such guarantees are full and unconditional. Supplemental condensed consolidating financial information of the Company, including such information for the Guarantors, is presented below. The information is presented in accordance with the requirements of Rule 3-10 under the SEC’s Regulation S-X. The financial information may not necessarily be indicative of results of operations, cash flows or financial position had the non-guarantor subsidiaries operated as independent entities. Investments in subsidiaries are presented using the equity method of accounting. The principal elimination entries eliminate investments in subsidiaries and intercompany balances and transactions. Separate financial statements of the Guarantors are not provided as the consolidating financial information contained herein provides a more meaningful disclosure to allow investors to determine the nature of the assets held by, and the operations of, the combined groups. BEACON ROOFING SUPPLY, INC. Condensed Consolidating Balance Sheets (Unaudited; In thousands) December 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Assets Current assets: Cash and cash equivalents $ - $ 30,877 $ 2,775 $ (15,229 ) $ 18,423 Accounts receivable, net - 856,373 26,516 (1,140 ) 881,749 Inventories, net - 998,450 26,860 - 1,025,310 Prepaid expenses and other current assets 6,065 361,431 8,102 - 375,598 Total current assets 6,065 2,247,131 64,253 (16,369 ) 2,301,080 Intercompany receivable, net - 1,526,435 - (1,526,435 ) - Investments in consolidated subsidiaries 6,289,626 - - (6,289,626 ) - Deferred income taxes, net 20,767 - - (20,767 ) - Property and equipment, net 19,775 243,911 10,056 - 273,742 Goodwill - 2,461,212 28,518 - 2,489,730 Intangibles, net - 1,280,202 2,040 - 1,282,242 Other assets, net 1,243 - - - 1,243 Total assets $ 6,337,476 $ 7,758,891 $ 104,867 $ (7,853,197 ) $ 6,348,037 Liabilities and Stockholders' Equity Current liabilities: Accounts payable $ 28,808 $ 532,526 $ 6,975 $ (16,369 ) $ 551,940 Accrued expenses 40,834 327,027 7,811 - 375,672 Current portions of long-term debt/obligations 9,700 10,615 - - 20,315 Total current liabilities 79,342 870,168 14,786 (16,369 ) 947,927 Intercompany payable, net 1,487,640 - 38,795 (1,526,435 ) - Borrowings under revolving lines of credit, net - 496,619 6,597 - 503,216 Long-term debt, net 2,497,123 - - - 2,497,123 Deferred income taxes, net - 130,847 99 (20,767 ) 110,179 Long-term obligations under equipment financing and other, net - 10,689 - - 10,689 Other long-term liabilities - 5,453 79 - 5,532 Total liabilities $ 4,064,105 $ 1,513,776 $ 60,356 $ (1,563,571 ) $ 4,074,666 Convertible preferred stock $ 399,195 $ - $ - $ - $ 399,195 Total stockholders' equity $ 1,874,176 $ 6,245,115 $ 44,511 $ (6,289,626 ) $ 1,874,176 Total liabilities and stockholders' equity $ 6,337,476 $ 7,758,891 $ 104,867 $ (7,853,197 ) $ 6,348,037 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Balance Sheets (Unaudited; In thousands) September 30, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Assets Current assets: Cash and cash equivalents $ - $ 136,499 $ 1,959 $ (8,531 ) $ 129,927 Accounts receivable, net - 1,051,410 40,262 (1,139 ) 1,090,533 Inventories, net - 907,605 28,442 - 936,047 Prepaid expenses and other current assets 23,711 214,011 6,638 - 244,360 Total current assets 23,711 2,309,525 77,301 (9,670 ) 2,400,867 Intercompany receivable, net - 1,361,615 - (1,361,615 ) - Investments in consolidated subsidiaries 6,109,325 - - (6,109,325 ) - Deferred income taxes, net 22,475 - - (22,475 ) - Property and equipment, net 18,929 250,517 10,961 - 280,407 Goodwill - 2,461,725 30,054 - 2,491,779 Intangibles, net - 1,332,104 2,262 - 1,334,366 Other assets, net 1,243 - - - 1,243 Total assets $ 6,175,683 $ 7,715,486 $ 120,578 $ (7,503,085 ) $ 6,508,662 Liabilities and Stockholders' Equity Current liabilities: Accounts payable $ 24,154 $ 843,907 $ 22,482 $ (9,671 ) $ 880,872 Accrued expenses 41,448 564,331 5,760 - 611,539 Current portions of long-term debt/obligations 9,700 9,961 - - 19,661 Total current liabilities 75,302 1,418,199 28,242 (9,671 ) 1,512,072 Intercompany payable, net 1,322,156 - 39,459 (1,361,615 ) - Borrowings under revolving lines of credit, net - 89,352 3,090 - 92,442 Long-term debt, net 2,494,725 - - - 2,494,725 Deferred income taxes, net - 128,846 622 (22,474 ) 106,994 Long-term obligations under equipment financing and other, net - 13,639 - - 13,639 Other long-term liabilities - 5,207 83 - 5,290 Total liabilities $ 3,892,183 $ 1,655,243 $ 71,496 $ (1,393,760 ) $ 4,225,162 Convertible preferred stock $ 399,195 $ - $ - $ - $ 399,195 Total stockholders' equity $ 1,884,305 $ 6,060,243 $ 49,082 $ (6,109,325 ) $ 1,884,305 Total liabilities and stockholders' equity $ 6,175,683 $ 7,715,486 $ 120,578 $ (7,503,085 ) $ 6,508,662 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Balance Sheets (Unaudited; In thousands) December 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Assets Current assets: Cash and cash equivalents $ - $ 70,698 $ 2,122 $ (8,993 ) $ 63,827 Restricted cash - - 1,300,000 - 1,300,000 Accounts receivable, net - 526,068 27,775 (1,140 ) 552,703 Inventories, net - 581,288 22,505 - 603,793 Prepaid expenses and other current assets 17,713 194,007 6,998 - 218,718 Total current assets 17,713 1,372,061 1,359,400 (10,133 ) 2,739,041 Intercompany receivable, net - 730,364 - (730,364 ) - Investments in consolidated subsidiaries 3,239,031 - - (3,239,031 ) - Deferred income taxes, net 18,286 - - (18,286 ) - Property and equipment, net 8,271 135,925 10,491 - 154,687 Goodwill - 1,220,813 31,012 - 1,251,825 Intangibles, net - 408,123 2,734 - 410,857 Other assets, net 3,341 5,527 - - 8,868 Total assets $ 3,286,642 $ 3,872,813 $ 1,403,637 $ (3,997,814 ) $ 4,565,278 Liabilities and Stockholders' Equity Current liabilities: Accounts payable $ 21,511 $ 296,547 $ 7,517 $ (10,133 ) $ 315,442 Accrued expenses 27,467 232,131 6,451 - 266,049 Current portions of long-term debt/obligations 4,500 9,739 - - 14,239 Total current liabilities 53,478 538,417 13,968 (10,133 ) 595,730 Intercompany payable, net 680,761 - 49,603 (730,364 ) - Long-term debt, net 700,059 - 1,300,000 - 2,000,059 Deferred income taxes, net - 111,066 671 (18,286 ) 93,451 Long-term obligations under equipment financing and other, net - 20,881 70 - 20,951 Other long-term liabilities - 2,743 - - 2,743 Total liabilities $ 1,434,298 $ 673,107 $ 1,364,312 $ (758,783 ) $ 2,712,934 Total stockholders' equity $ 1,852,344 $ 3,199,706 $ 39,325 $ (3,239,031 ) $ 1,852,344 Total liabilities and stockholders' equity $ 3,286,642 $ 3,872,813 $ 1,403,637 $ (3,997,814 ) $ 4,565,278 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Operations (Unaudited; In thousands) Three Months Ended December 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net sales $ - $ 1,678,895 $ 42,781 $ - $ 1,721,676 Cost of products sold - 1,252,295 33,812 - 1,286,107 Gross profit - 426,600 8,969 - 435,569 Operating expense: Selling, general and administrative 9,775 309,548 8,370 - 327,693 Depreciation 764 16,372 465 - 17,601 Amortization - 51,911 110 - 52,021 Total operating expense 10,539 377,831 8,945 - 397,315 Intercompany charges (income) (6,687 ) 6,687 - - - Income (loss) from operations (3,852 ) 42,082 24 - 38,254 Interest expense, financing costs, and other 34,313 3,485 563 - 38,361 Intercompany interest expense (income) (9,680 ) 9,298 382 - - Income (loss) before provision for income taxes (28,485 ) 29,299 (921 ) - (107 ) Provision for (benefit from) income taxes (7,354 ) 8,400 (260 ) - 786 Income (loss) before equity in net income of subsidiaries (21,131 ) 20,899 (661 ) - (893 ) Equity in net income of subsidiaries 20,238 - - (20,238 ) - Net income (loss) $ (893 ) $ 20,899 $ (661 ) $ (20,238 ) $ (893 ) Three Months Ended December 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net sales $ - $ 1,076,262 $ 45,717 $ - $ 1,121,979 Cost of products sold - 816,436 35,790 - 852,226 Gross profit - 259,826 9,927 - 269,753 Operating expense: Selling, general and administrative (133 ) 184,881 9,005 - 193,753 Depreciation 456 7,810 443 - 8,709 Amortization - 18,064 131 - 18,195 Total operating expense 323 210,755 9,579 - 220,657 Intercompany charges (income) 893 (893 ) - - - Income (loss) from operations (1,216 ) 49,964 348 - 49,096 Interest expense, financing costs, and other 10,076 825 11,667 - 22,568 Intercompany interest expense (income) (5,708 ) 5,321 387 - - Income (loss) before provision for income taxes (5,584 ) 43,818 (11,706 ) - 26,528 Provision for (benefit from) income taxes 5,521 (46,672 ) 83 - (41,068 ) Income (loss) before equity in net income of subsidiaries (11,105 ) 90,490 (11,789 ) - 67,596 Equity in net income of subsidiaries 78,701 - - (78,701 ) - Net income (loss) $ 67,596 $ 90,490 $ (11,789 ) $ (78,701 ) $ 67,596 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Comprehensive Income (Unaudited; In thousands) Three Months Ended December 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net income (loss) $ (893 ) $ 20,899 $ (661 ) $ (20,238 ) $ (893 ) Other comprehensive income (loss): Foreign currency translation adjustment (3,910 ) - (3,910 ) 3,910 (3,910 ) Total other comprehensive income (loss) (3,910 ) - (3,910 ) 3,910 (3,910 ) Comprehensive income (loss) $ (4,803 ) $ 20,899 $ (4,571 ) $ (16,328 ) $ (4,803 ) Three Months Ended December 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net income (loss) $ 67,596 $ 90,490 $ (11,789 ) $ (78,701 ) $ 67,596 Other comprehensive income (loss): Foreign currency translation adjustment 57 - 57 (57 ) 57 Total other comprehensive income (loss) 57 - 57 (57 ) 57 Comprehensive income (loss) $ 67,653 $ 90,490 $ (11,732 ) $ (78,758 ) $ 67,653 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Cash Flows (Unaudited; In thousands) Three Months Ended December 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net cash provided by (used in) operating activities $ 12,792 $ (336,407 ) $ (2,659 ) $ (10,609 ) $ (336,883 ) Investing Activities Purchases of property and equipment (1,610 ) (9,971 ) (107 ) - (11,688 ) Acquisition of businesses, net - (163,973 ) - - (163,973 ) Proceeds from the sale of assets - 400 1 - 401 Intercompany activity (2,399 ) - - 2,399 - Net cash provided by (used in) investing activities (4,009 ) (173,544 ) (106 ) 2,399 (175,260 ) Financing Activities Borrowings under revolving lines of credit - 1,285,017 13,637 - 1,298,654 Repayments under revolving lines of credit - (878,376 ) (9,849 ) - (888,225 ) Payment of debt issuance costs - - - - - Repayments under equipment financing facilities and other - (1,465 ) - - (1,465 ) Payment of dividends on preferred stock (6,000 ) - - - (6,000 ) Proceeds from issuance of common stock related to equity awards 834 - - - 834 Taxes paid related to net share settlement of equity awards (3,617 ) - - - (3,617 ) Intercompany activity - (847 ) (561 ) 1,408 - Net cash provided by (used in) financing activities (8,783 ) 404,329 3,227 1,408 400,181 Effect of exchange rate changes on cash and cash equivalents - - 354 104 458 Net increase (decrease) in cash and cash equivalents - (105,622 ) 816 (6,698 ) (111,504 ) Cash and cash equivalents, beginning of period - 136,499 1,959 (8,531 ) 129,927 Cash and cash equivalents, end of period $ - $ 30,877 $ 2,775 $ (15,229 ) $ 18,423 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Cash Flows (Unaudited; In thousands) Three Months Ended December 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net cash provided by (used in) operating activities $ (37,331 ) $ 2,338 $ (9,658 ) $ 4,195 $ (40,456 ) Investing Activities Purchases of property and equipment (2,117 ) (4,874 ) (425 ) - (7,416 ) Acquisition of businesses - - - - - Proceeds from the sale of assets - 398 15 - 413 Intercompany activity 61,938 - - (61,938 ) - Net cash provided by (used in) investing activities 59,821 (4,476 ) (410 ) (61,938 ) (7,003 ) Financing Activities Borrowings under revolving lines of credit - 878 16,524 - 17,402 Repayments under revolving lines of credit - (877 ) (19,671 ) - (20,548 ) Repayments under term loan - - - - - Borrowings under Senior Notes - - 1,300,000 - 1,300,000 Payment of debt issuance costs (21,917 ) - - - (21,917 ) Repayments under equipment financing facilities and other - (1,973 ) 5 - (1,968 ) Payment of issuance costs from secondary offering of common stock (429 ) - - - (429 ) Proceeds from issuance of common stock related to equity awards 3,781 - - - 3,781 Taxes paid related to net share settlement of equity awards (3,925 ) - - - (3,925 ) Intercompany activity - (74,991 ) 13,110 61,881 - Net cash provided by (used in) financing activities (22,490 ) (76,963 ) 1,309,968 61,881 1,272,396 Effect of exchange rate changes on cash, cash equivalents, and restricted cash - - 640 - 640 Net increase (decrease) in cash, cash equivalents, and restricted cash - (79,101 ) 1,300,540 4,138 1,225,577 Cash, cash equivalents, and restricted cash, beginning of period - 149,799 1,582 (13,131 ) 138,250 Cash, cash equivalents, and restricted cash, end of period $ - $ 70,698 $ 1,302,122 $ (8,993 ) $ 1,363,827

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The Company prepared the condensed consolidated financial statements in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the requirements of the Securities and Exchange Commission (“SEC”). As permitted under those rules, certain footnotes or other financial information have been condensed or omitted. Certain prior period amounts have been reclassified to conform to current period presentation. The balance sheet as of December 31, 2017 has been presented for a better understanding of the impact of seasonal fluctuations on the Company’s financial condition. In management’s opinion, the financial statements include all normal and recurring adjustments that are considered necessary for the fair presentation of the Company’s financial position and operating results. The results for the three months ended December 31, 2018 are not necessarily indicative of the results to be expected for the twelve months ending September 30, 2019 (“fiscal year 2019” or “2019”). The three-month periods ended December 31, 2018 and 2017 had 62 and 61 business days, respectively. These interim Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto contained in the Company’s fiscal year 2018 (“2018”) Annual Report on Form 10-K for the year ended September 30, 2018.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in these consolidated financial statements and accompanying notes. Significant items subject to such estimates include inventories, purchase price allocations, recoverability of goodwill and intangibles, and income taxes. Actual amounts could differ from those estimates.
Recent Accounting Pronouncements - Adopted and Not Yet Adopted	Recent Accounting Pronouncements—Adopted In May 2014, the FASB issued ASU 2014-09, “ Revenue from Contracts with Customers In January 2017, the FASB issued ASU 2017-01, “ Business Combinations: Clarifying the Definition of a Business.” In May 2017, the FASB issued ASU 2017-09, “Scope of Modification Accounting.” Recent Accounting Pronouncements—Not Yet Adopted In February 2016, the FASB issued ASU 2016-02, “ Leases In June 2016, the FASB issued ASU 2016-13, “ Financial Instruments – Credit Losses: Measurement of Credit Losses on Financial Instruments.” In January 2017, the FASB issued ASU 2017-04, “ Simplifying the Accounting for Goodwill Impairment.” In February 2018, the FASB issued ASU 2018-02, “Income Statement – Reporting Comprehensive Income.”

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
Acquisitions (Tables)	Dec. 31, 2018
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	As of December 31, 2018, the Company had finalized the purchase accounting entries for the Allied Acquisition, detailed as follows (in thousands): January 2, 2018 January 2, 2018 (as reported at March 31, 2018) Adjustments (as adjusted at December 31, 2018) Cash $ 19,322 $ (19,153 ) $ 169 Accounts receivable 315,485 22,064 337,549 Inventory 322,705 (7,920 ) 314,785 Prepaid and other current assets 59,279 16,161 75,440 Property, plant, and equipment 139,528 (168 ) 139,360 Goodwill 1,130,635 102,145 1,232,780 Intangible assets 1,037,000 - 1,037,000 Current liabilities (271,252 ) 11,963 (259,289 ) Non-current liabilities (6,820 ) 6,097 (723 ) Total purchase price $ 2,745,882 $ 131,189 $ 2,877,071
Business Acquisition, Pro Forma Information	The following table represents the unaudited pro forma consolidated net sales and net income (loss) for the Company for the periods indicated (in thousands): Three Months Ended December 31, 2017 (unaudited) Net sales $ 1,787,628 Net income (loss) 32,257

Net Sales (Tables)

Net Sales (Tables)	3 Months Ended
Net Sales (Tables)	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Summary of Net Sales by Product Line and Geography	The following table presents the Company’s net sales by product line and geography for the three months ended December 31, 2018 (in thousands): Three Months Ended December 31, 2018 U.S. Canada Total Residential roofing products $ 720,511 $ 11,679 $ 732,190 Non-residential roofing products 390,268 29,641 419,909 Complementary building products 568,116 1,461 569,577 Total net sales $ 1,678,895 $ 42,781 $ 1,721,676

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	3 Months Ended
Net Income (Loss) Per Share (Tables)	Dec. 31, 2018
Earnings Per Share [Abstract]
Components and Calculation of Basic and Diluted Net Income (Loss) Per Share	The following table presents the components and calculations of basic and diluted net income (loss) per share for each period presented (in thousands, except share and per share amounts): Three Months Ended December 31, 2018 2017 Net income (loss) $ (893 ) $ 67,596 Dividends on preferred shares (6,000 ) - Net income (loss) attributable to common shareholders $ (6,893 ) $ 67,596 Undistributed income allocated to participating securities - - Net income (loss) attributable to common shareholders - basic and diluted $ (6,893 ) $ 67,596 Weighted-average common shares outstanding - basic 68,248,020 67,825,430 Effect of common share equivalents - 1,419,248 Weighted-average common shares outstanding - diluted 68,248,020 69,244,678 Net income (loss) per share - basic $ (0.10 ) $ 1.00 Net income (loss) per share - diluted $ (0.10 ) $ 0.98
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following table includes the number of shares that may be dilutive common shares in the future. These shares were not included in the computation of diluted net income (loss) per share because the effect was either anti-dilutive or the requisite performance conditions were not met: Three Months Ended December 31, 2018 2017 Stock options 1,554,518 288,275 Restricted stock units 318,229 - Preferred Stock 9,694,619 -

Stock-based Compensation (Table

Stock-based Compensation (Tables)	3 Months Ended
Stock-based Compensation (Tables)	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Fair Value of Options, Black-Scholes Option-Pricing Model, Assumptions	The fair value of the options granted during the three months ended December 31, 2018 were estimated on the date of grant using the Black-Scholes option-pricing model with the following assumptions: Risk-free interest rate 3.00 % Expected volatility 29.34 % Expected life (in years) 5.18 Dividend yield -
Stock Options Outstanding and Activity During the Period	The following table summarizes all stock option activity for the three months ended December 31, 2018 (in thousands, except share, per share, and time period amounts): Options Outstanding Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (Years) Aggregate Intrinsic Value 1 Balance as of September 30, 2018 1,969,037 $ 33.08 5.7 $ 14,088 Granted 605,184 27.26 Exercised (48,800 ) 17.11 Canceled/Forfeited (12,967 ) 41.12 Expired (950 ) 12.25 Balance as of December 31, 2018 2,511,504 $ 31.96 6.6 $ 11,478 Vested and expected to vest after December 31, 2018 2,455,082 $ 31.94 6.5 $ 11,275 Exercisable as of December 31, 2018 1,645,162 $ 30.75 5.1 $ 8,511 ________________________________________________________________ 1
Stock Option Grants, Vesting, and Exercises	The following table summarizes additional information on stock options for the periods presented (in thousands, except per share amounts): Three Months Ended December 31, 2018 2017 Weighted-average fair value of stock options granted $ 8.75 $ 15.86 Total grant date fair value of stock options vested 3,680 3,773 Total intrinsic value of stock options exercised 712 5,448
Restricted Shares and Units Outstanding and Activity During the Period	The following table summarizes all restricted stock unit activity for the three months ended December 31, 2018: RSUs Outstanding Weighted-Average Grant Date Fair Value Balance as of September 30, 2018 934,023 $ 47.00 Granted 630,745 27.28 Released (366,779 ) 40.46 Canceled/Forfeited (77,455 ) 47.52 Balance as of December 31, 2018 1,120,534 $ 38.00 Vested and expected to vest after December 31, 2018 1,040,181 $ 37.78
Schedule Of Restricted Stock Units Additional Information	The following table summarizes additional information on RSUs for the periods presented (in thousands, except per share amounts): Three Months Ended December 31, 2018 2017 Weighted-average fair value of RSUs granted $ 27.28 $ 55.17 Total grant date fair value of RSUs vested 14,840 5,786 Total intrinsic value of RSUs released 11,160 10,683

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
Goodwill and Intangible Assets (Tables)	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Changes in goodwill	The following table sets forth the change in the carrying amount of goodwill during the three months ended December 31, 2018 and 2017, respectively (in thousands): Balance as of September 30, 2017 $ 1,251,986 Translation and other adjustments (161 ) Balance as of December 31, 2017 $ 1,251,825 Balance as of September 30, 2018 $ 2,491,779 Acquisitions 1 (513 ) Translation and other adjustments (1,536 ) Balance as of December 31, 2018 $ 2,489,730 _____________________________ 1 Reflects purchase accounting adjustments related to fiscal year 2018 acquisition of Atlas Supply, Inc. (see Note 3 for further discussion).
Summary of Intangible Assets	The following table summarizes intangible assets by category (in thousands, except time period amounts): December 31, 2018 September 30, 2018 December 31, 2017 Weighted-Average Remaining Life 1 (Years) Amortizable intangible assets: Non-compete agreements $ 2,824 $ 2,824 $ 2,824 2.47 Customer relationships 1,530,748 1,530,565 609,984 18.38 Trademarks 10,500 10,500 10,500 7.41 Beneficial lease arrangements 8,060 8,060 1,060 4.24 Total amortizable intangible assets 1,552,132 1,551,949 624,368 Accumulated amortization (462,940 ) (410,633 ) (286,561 ) Total amortizable intangible assets, net $ 1,089,192 $ 1,141,316 $ 337,807 Indefinite lived trademarks 193,050 193,050 73,050 Total intangibles, net $ 1,282,242 $ 1,334,366 $ 410,857 _________________________________________________________________ 1 As of December 31, 2018.
Summary of Estimated Future Amortization	The following table summarizes the estimated future amortization expense for intangible assets (in thousands): Year Ending September 30, 2019 (Jan - Sept) $ 156,534 2020 179,541 2021 149,974 2022 121,426 2023 97,517 Thereafter 384,200 Total future amortization expense $ 1,089,192

Financing Arrangements (Tables)

Financing Arrangements (Tables)	3 Months Ended
Financing Arrangements (Tables)	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	The following table summarizes all financing arrangements from the respective periods presented (in thousands): December 31, 2018 September 30, 2018 December 31, 2017 Revolving Lines of Credit 2023 ABL: U.S. Revolver, expires January 2023 1 $ 496,619 $ 89,352 $ - Canada Revolver, expires January 2023 2 6,597 3,090 - Current portion - - - Borrowings under revolving lines of credit, net $ 503,216 $ 92,442 $ - Long-term Debt, net Term Loans: Term Loan, matures October 2022 3 $ - $ - $ 433,828 Term Loan, matures January 2025 4 932,102 930,726 - Current portion (9,700 ) (9,700 ) (4,500 ) Long-term borrowings under term loans 922,402 921,026 429,328 Senior Notes: Senior Notes, mature October 2023 5 293,926 293,607 292,648 Senior Notes, mature November 2025 6 1,280,795 1,280,092 1,278,083 Current portion - - - Long-term borrowings under senior notes 1,574,721 1,573,699 1,570,731 Long-term debt, net $ 2,497,123 $ 2,494,725 $ 2,000,059 Equipment Financing Facilities and Other Equipment financing facilities, various maturities through September 2021 7 $ 10,148 $ 11,222 $ 11,657 Capital lease obligations, various maturities through November 2021 8 11,156 12,378 19,033 Current portion (10,615 ) (9,961 ) (9,739 ) Long-term obligations under equipment financing and other, net $ 10,689 $ 13,639 $ 20,951 ____________________________________________________________ 1 Effective rate on borrowings of 4.37% and 3.36% as of December 31, 2018 and September 30, 2018, respectively. 2 Effective rate on borrowings of 4.45% and 3.95% as of December 31, 2018 and September 30, 2018, respectively. 3 Extinguished on January 2, 2018; Interest rate of 4.06% as of December 31, 2017. 4 Interest rate of 4.77% and 4.53% as of December 31, 2018 and September 30, 2018, respectively. 5 Interest rate of 6.38% as of December 31, 2018, September 30, 2017 and December 31, 2017. 6 Interest rate of 4.88% as of December 31, 2018, September 30, 2017 and December 31, 2017. 7 Fixed interest rates ranging from 2.33% to 3.25% as of December 31, 2018, September 30, 2017, and December 31, 2017. 8 Fixed interest rates ranging from 2.72% to 10.39% as of December 31, 2018 , September 30, 2017, and December 31, 2017.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
Commitments and Contingencies (Tables)	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Schedule of Minimum Rental Commitments under Non-cancelable Operating Leases	At December 31, 2018, the minimum rental commitments under all non-cancelable operating leases with initial or remaining terms of more than one year were as follows (in thousands): Year Ending September 30, 2019 (Jan - Sept) $ 110,514 2020 101,743 2021 90,734 2022 71,869 2023 55,048 Thereafter 146,410 Total minimum lease payments $ 576,318

Geographic Data (Tables)

Geographic Data (Tables)	3 Months Ended
Geographic Data (Tables)	Dec. 31, 2018
Segment Reporting [Abstract]
Schedule of Geographic Information	The following table summarizes certain geographic information for the periods presented (in thousands): December 31, 2018 September 30, 2018 December 31, 2017 Long-lived assets: U.S. $ 1,352,081 $ 1,409,742 $ 488,137 Canada 12,096 13,224 13,225 Total long-lived assets $ 1,364,177 $ 1,422,966 $ 501,362

Supplemental Guarantor Inform_2

Supplemental Guarantor Information (Tables)	3 Months Ended
Supplemental Guarantor Information (Tables)	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Condensed Consolidating Balance Sheets	BEACON ROOFING SUPPLY, INC. Condensed Consolidating Balance Sheets (Unaudited; In thousands) December 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Assets Current assets: Cash and cash equivalents $ - $ 30,877 $ 2,775 $ (15,229 ) $ 18,423 Accounts receivable, net - 856,373 26,516 (1,140 ) 881,749 Inventories, net - 998,450 26,860 - 1,025,310 Prepaid expenses and other current assets 6,065 361,431 8,102 - 375,598 Total current assets 6,065 2,247,131 64,253 (16,369 ) 2,301,080 Intercompany receivable, net - 1,526,435 - (1,526,435 ) - Investments in consolidated subsidiaries 6,289,626 - - (6,289,626 ) - Deferred income taxes, net 20,767 - - (20,767 ) - Property and equipment, net 19,775 243,911 10,056 - 273,742 Goodwill - 2,461,212 28,518 - 2,489,730 Intangibles, net - 1,280,202 2,040 - 1,282,242 Other assets, net 1,243 - - - 1,243 Total assets $ 6,337,476 $ 7,758,891 $ 104,867 $ (7,853,197 ) $ 6,348,037 Liabilities and Stockholders' Equity Current liabilities: Accounts payable $ 28,808 $ 532,526 $ 6,975 $ (16,369 ) $ 551,940 Accrued expenses 40,834 327,027 7,811 - 375,672 Current portions of long-term debt/obligations 9,700 10,615 - - 20,315 Total current liabilities 79,342 870,168 14,786 (16,369 ) 947,927 Intercompany payable, net 1,487,640 - 38,795 (1,526,435 ) - Borrowings under revolving lines of credit, net - 496,619 6,597 - 503,216 Long-term debt, net 2,497,123 - - - 2,497,123 Deferred income taxes, net - 130,847 99 (20,767 ) 110,179 Long-term obligations under equipment financing and other, net - 10,689 - - 10,689 Other long-term liabilities - 5,453 79 - 5,532 Total liabilities $ 4,064,105 $ 1,513,776 $ 60,356 $ (1,563,571 ) $ 4,074,666 Convertible preferred stock $ 399,195 $ - $ - $ - $ 399,195 Total stockholders' equity $ 1,874,176 $ 6,245,115 $ 44,511 $ (6,289,626 ) $ 1,874,176 Total liabilities and stockholders' equity $ 6,337,476 $ 7,758,891 $ 104,867 $ (7,853,197 ) $ 6,348,037 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Balance Sheets (Unaudited; In thousands) September 30, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Assets Current assets: Cash and cash equivalents $ - $ 136,499 $ 1,959 $ (8,531 ) $ 129,927 Accounts receivable, net - 1,051,410 40,262 (1,139 ) 1,090,533 Inventories, net - 907,605 28,442 - 936,047 Prepaid expenses and other current assets 23,711 214,011 6,638 - 244,360 Total current assets 23,711 2,309,525 77,301 (9,670 ) 2,400,867 Intercompany receivable, net - 1,361,615 - (1,361,615 ) - Investments in consolidated subsidiaries 6,109,325 - - (6,109,325 ) - Deferred income taxes, net 22,475 - - (22,475 ) - Property and equipment, net 18,929 250,517 10,961 - 280,407 Goodwill - 2,461,725 30,054 - 2,491,779 Intangibles, net - 1,332,104 2,262 - 1,334,366 Other assets, net 1,243 - - - 1,243 Total assets $ 6,175,683 $ 7,715,486 $ 120,578 $ (7,503,085 ) $ 6,508,662 Liabilities and Stockholders' Equity Current liabilities: Accounts payable $ 24,154 $ 843,907 $ 22,482 $ (9,671 ) $ 880,872 Accrued expenses 41,448 564,331 5,760 - 611,539 Current portions of long-term debt/obligations 9,700 9,961 - - 19,661 Total current liabilities 75,302 1,418,199 28,242 (9,671 ) 1,512,072 Intercompany payable, net 1,322,156 - 39,459 (1,361,615 ) - Borrowings under revolving lines of credit, net - 89,352 3,090 - 92,442 Long-term debt, net 2,494,725 - - - 2,494,725 Deferred income taxes, net - 128,846 622 (22,474 ) 106,994 Long-term obligations under equipment financing and other, net - 13,639 - - 13,639 Other long-term liabilities - 5,207 83 - 5,290 Total liabilities $ 3,892,183 $ 1,655,243 $ 71,496 $ (1,393,760 ) $ 4,225,162 Convertible preferred stock $ 399,195 $ - $ - $ - $ 399,195 Total stockholders' equity $ 1,884,305 $ 6,060,243 $ 49,082 $ (6,109,325 ) $ 1,884,305 Total liabilities and stockholders' equity $ 6,175,683 $ 7,715,486 $ 120,578 $ (7,503,085 ) $ 6,508,662 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Balance Sheets (Unaudited; In thousands) December 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Assets Current assets: Cash and cash equivalents $ - $ 70,698 $ 2,122 $ (8,993 ) $ 63,827 Restricted cash - - 1,300,000 - 1,300,000 Accounts receivable, net - 526,068 27,775 (1,140 ) 552,703 Inventories, net - 581,288 22,505 - 603,793 Prepaid expenses and other current assets 17,713 194,007 6,998 - 218,718 Total current assets 17,713 1,372,061 1,359,400 (10,133 ) 2,739,041 Intercompany receivable, net - 730,364 - (730,364 ) - Investments in consolidated subsidiaries 3,239,031 - - (3,239,031 ) - Deferred income taxes, net 18,286 - - (18,286 ) - Property and equipment, net 8,271 135,925 10,491 - 154,687 Goodwill - 1,220,813 31,012 - 1,251,825 Intangibles, net - 408,123 2,734 - 410,857 Other assets, net 3,341 5,527 - - 8,868 Total assets $ 3,286,642 $ 3,872,813 $ 1,403,637 $ (3,997,814 ) $ 4,565,278 Liabilities and Stockholders' Equity Current liabilities: Accounts payable $ 21,511 $ 296,547 $ 7,517 $ (10,133 ) $ 315,442 Accrued expenses 27,467 232,131 6,451 - 266,049 Current portions of long-term debt/obligations 4,500 9,739 - - 14,239 Total current liabilities 53,478 538,417 13,968 (10,133 ) 595,730 Intercompany payable, net 680,761 - 49,603 (730,364 ) - Long-term debt, net 700,059 - 1,300,000 - 2,000,059 Deferred income taxes, net - 111,066 671 (18,286 ) 93,451 Long-term obligations under equipment financing and other, net - 20,881 70 - 20,951 Other long-term liabilities - 2,743 - - 2,743 Total liabilities $ 1,434,298 $ 673,107 $ 1,364,312 $ (758,783 ) $ 2,712,934 Total stockholders' equity $ 1,852,344 $ 3,199,706 $ 39,325 $ (3,239,031 ) $ 1,852,344 Total liabilities and stockholders' equity $ 3,286,642 $ 3,872,813 $ 1,403,637 $ (3,997,814 ) $ 4,565,278
Condensed Consolidating Statements of Operations	BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Operations (Unaudited; In thousands) Three Months Ended December 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net sales $ - $ 1,678,895 $ 42,781 $ - $ 1,721,676 Cost of products sold - 1,252,295 33,812 - 1,286,107 Gross profit - 426,600 8,969 - 435,569 Operating expense: Selling, general and administrative 9,775 309,548 8,370 - 327,693 Depreciation 764 16,372 465 - 17,601 Amortization - 51,911 110 - 52,021 Total operating expense 10,539 377,831 8,945 - 397,315 Intercompany charges (income) (6,687 ) 6,687 - - - Income (loss) from operations (3,852 ) 42,082 24 - 38,254 Interest expense, financing costs, and other 34,313 3,485 563 - 38,361 Intercompany interest expense (income) (9,680 ) 9,298 382 - - Income (loss) before provision for income taxes (28,485 ) 29,299 (921 ) - (107 ) Provision for (benefit from) income taxes (7,354 ) 8,400 (260 ) - 786 Income (loss) before equity in net income of subsidiaries (21,131 ) 20,899 (661 ) - (893 ) Equity in net income of subsidiaries 20,238 - - (20,238 ) - Net income (loss) $ (893 ) $ 20,899 $ (661 ) $ (20,238 ) $ (893 ) Three Months Ended December 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net sales $ - $ 1,076,262 $ 45,717 $ - $ 1,121,979 Cost of products sold - 816,436 35,790 - 852,226 Gross profit - 259,826 9,927 - 269,753 Operating expense: Selling, general and administrative (133 ) 184,881 9,005 - 193,753 Depreciation 456 7,810 443 - 8,709 Amortization - 18,064 131 - 18,195 Total operating expense 323 210,755 9,579 - 220,657 Intercompany charges (income) 893 (893 ) - - - Income (loss) from operations (1,216 ) 49,964 348 - 49,096 Interest expense, financing costs, and other 10,076 825 11,667 - 22,568 Intercompany interest expense (income) (5,708 ) 5,321 387 - - Income (loss) before provision for income taxes (5,584 ) 43,818 (11,706 ) - 26,528 Provision for (benefit from) income taxes 5,521 (46,672 ) 83 - (41,068 ) Income (loss) before equity in net income of subsidiaries (11,105 ) 90,490 (11,789 ) - 67,596 Equity in net income of subsidiaries 78,701 - - (78,701 ) - Net income (loss) $ 67,596 $ 90,490 $ (11,789 ) $ (78,701 ) $ 67,596
Condensed Consolidating Statements of Comprehensive Income	BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Comprehensive Income (Unaudited; In thousands) Three Months Ended December 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net income (loss) $ (893 ) $ 20,899 $ (661 ) $ (20,238 ) $ (893 ) Other comprehensive income (loss): Foreign currency translation adjustment (3,910 ) - (3,910 ) 3,910 (3,910 ) Total other comprehensive income (loss) (3,910 ) - (3,910 ) 3,910 (3,910 ) Comprehensive income (loss) $ (4,803 ) $ 20,899 $ (4,571 ) $ (16,328 ) $ (4,803 ) Three Months Ended December 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net income (loss) $ 67,596 $ 90,490 $ (11,789 ) $ (78,701 ) $ 67,596 Other comprehensive income (loss): Foreign currency translation adjustment 57 - 57 (57 ) 57 Total other comprehensive income (loss) 57 - 57 (57 ) 57 Comprehensive income (loss) $ 67,653 $ 90,490 $ (11,732 ) $ (78,758 ) $ 67,653
Condensed Consolidating Statements of Cash Flows	BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Cash Flows (Unaudited; In thousands) Three Months Ended December 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net cash provided by (used in) operating activities $ 12,792 $ (336,407 ) $ (2,659 ) $ (10,609 ) $ (336,883 ) Investing Activities Purchases of property and equipment (1,610 ) (9,971 ) (107 ) - (11,688 ) Acquisition of businesses, net - (163,973 ) - - (163,973 ) Proceeds from the sale of assets - 400 1 - 401 Intercompany activity (2,399 ) - - 2,399 - Net cash provided by (used in) investing activities (4,009 ) (173,544 ) (106 ) 2,399 (175,260 ) Financing Activities Borrowings under revolving lines of credit - 1,285,017 13,637 - 1,298,654 Repayments under revolving lines of credit - (878,376 ) (9,849 ) - (888,225 ) Payment of debt issuance costs - - - - - Repayments under equipment financing facilities and other - (1,465 ) - - (1,465 ) Payment of dividends on preferred stock (6,000 ) - - - (6,000 ) Proceeds from issuance of common stock related to equity awards 834 - - - 834 Taxes paid related to net share settlement of equity awards (3,617 ) - - - (3,617 ) Intercompany activity - (847 ) (561 ) 1,408 - Net cash provided by (used in) financing activities (8,783 ) 404,329 3,227 1,408 400,181 Effect of exchange rate changes on cash and cash equivalents - - 354 104 458 Net increase (decrease) in cash and cash equivalents - (105,622 ) 816 (6,698 ) (111,504 ) Cash and cash equivalents, beginning of period - 136,499 1,959 (8,531 ) 129,927 Cash and cash equivalents, end of period $ - $ 30,877 $ 2,775 $ (15,229 ) $ 18,423 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Cash Flows (Unaudited; In thousands) Three Months Ended December 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net cash provided by (used in) operating activities $ (37,331 ) $ 2,338 $ (9,658 ) $ 4,195 $ (40,456 ) Investing Activities Purchases of property and equipment (2,117 ) (4,874 ) (425 ) - (7,416 ) Acquisition of businesses - - - - - Proceeds from the sale of assets - 398 15 - 413 Intercompany activity 61,938 - - (61,938 ) - Net cash provided by (used in) investing activities 59,821 (4,476 ) (410 ) (61,938 ) (7,003 ) Financing Activities Borrowings under revolving lines of credit - 878 16,524 - 17,402 Repayments under revolving lines of credit - (877 ) (19,671 ) - (20,548 ) Repayments under term loan - - - - - Borrowings under Senior Notes - - 1,300,000 - 1,300,000 Payment of debt issuance costs (21,917 ) - - - (21,917 ) Repayments under equipment financing facilities and other - (1,973 ) 5 - (1,968 ) Payment of issuance costs from secondary offering of common stock (429 ) - - - (429 ) Proceeds from issuance of common stock related to equity awards 3,781 - - - 3,781 Taxes paid related to net share settlement of equity awards (3,925 ) - - - (3,925 ) Intercompany activity - (74,991 ) 13,110 61,881 - Net cash provided by (used in) financing activities (22,490 ) (76,963 ) 1,309,968 61,881 1,272,396 Effect of exchange rate changes on cash, cash equivalents, and restricted cash - - 640 - 640 Net increase (decrease) in cash, cash equivalents, and restricted cash - (79,101 ) 1,300,540 4,138 1,225,577 Cash, cash equivalents, and restricted cash, beginning of period - 149,799 1,582 (13,131 ) 138,250 Cash, cash equivalents, and restricted cash, end of period $ - $ 70,698 $ 1,302,122 $ (8,993 ) $ 1,363,827

Company Overview - Additional I

Company Overview - Additional Information (Detail) $ in Millions	Jan. 02, 2018USD ($)	Dec. 31, 2018StateProvince
Company Overview [Line Items]
Date of incorporation		Aug. 22, 1997
Allied Acquisition [Member]
Company Overview [Line Items]
Acquisition purchase price in cash \| $	$ 2,625
United States [Member]
Company Overview [Line Items]
Number of states in which entity operates \| State		50
Canada [Member]
Company Overview [Line Items]
Number of provinces in which entity operates \| Province		6

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail)	Jul. 16, 2018USD ($)Location	May 01, 2018USD ($)Location	Jan. 02, 2018USD ($)StateLocation$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Sep. 30, 2018USD ($)Branch$ / sharesshares	Mar. 31, 2018USD ($)	Oct. 25, 2017USD ($)	Sep. 30, 2017USD ($)
Business Acquisition [Line Items]
Preferred stock, issuance \| shares				0	0	0
Mezzanine equity				$ 399,195,000		$ 399,195,000
Common stock, par value \| $ / shares				$ 0.01	$ 0.01	$ 0.01
Number of business locations acquired \| Branch						7
Business acquisition, sales reported by acquired entity for last annual period					$ 1,787,628,000
Business acquisitions purchase price allocation goodwill amount				$ 2,489,730,000	$ 1,251,825,000	$ 2,491,779,000			$ 1,251,986,000
Senior Notes, Matures November 2025 [Member]
Business Acquisition [Line Items]
Debt instrument, aggregate principal amount								$ 1,300,000,000
Allied Acquisition [Member]
Business Acquisition [Line Items]
Acquisition purchase price in cash			$ 2,625,000,000
Adjusted purchase price				2,877,071,000			$ 2,745,882,000
Net working capital adjustment				88,100,000
Business acquisition purchase price and tax position				164,000,000
Number of business locations acquired \| Location			208
Number of states business location acquired \| State			31
Business acquisition, goodwill, tax deductible amount				1,160,000,000
Business acquisitions purchase price allocation goodwill amount				1,232,780,000			1,130,635,000
Business acquisitions purchase price allocation intangible assets other than goodwill				1,037,000,000			$ 1,037,000,000
Allied Acquisition [Member] \| Investment Agreement [Member] \| Series A Cumulative Convertible Participating Preferred Stock [Member]
Business Acquisition [Line Items]
Preferred stock, issuance \| shares			400,000
Preferred stock, par value \| $ / shares			$ 0.01
Preferred stock, liquidation preference value			$ 400,000,000
Preferred stock, liquidation purchase price per share \| $ / shares			$ 1,000
Proceeds from convertible preferred stock			$ 400,000,000
Preferred stock conversion price per share \| $ / shares			$ 41.26
Preferred stock dividend rate			6.00%
Mezzanine equity				399,200,000
Unamortized issuance costs				800,000
Allied Acquisition [Member] \| Secured Term Loan B Facility [Member]
Business Acquisition [Line Items]
Long-term line of credit			$ 970,000,000
Allied Acquisition [Member] \| Secured Term Loan B Facility [Member] \| LIBOR [Member]
Business Acquisition [Line Items]
Base borrowing rates			1.25%
Allied Acquisition [Member] \| Senior Notes, Matures November 2025 [Member]
Business Acquisition [Line Items]
Debt instrument, aggregate principal amount			$ 1,300,000,000
Allied Acquisition [Member] \| Senior-secured Asset-based Revolving Line Of Credit [Member] \| LIBOR [Member]
Business Acquisition [Line Items]
Base borrowing rates			2.25%
Allied Acquisition [Member] \| Stock Purchase Agreement [Member]
Business Acquisition [Line Items]
Acquisition purchase price in cash			$ 2,625,000,000
Tri-State Builder Supply [Member]
Business Acquisition [Line Items]
Number of business locations acquired \| Location		1
Business acquisition, sales reported by acquired entity for last annual period		$ 6,000,000
Atlas Supply, Inc. [Member]
Business Acquisition [Line Items]
Number of business locations acquired \| Location	6
Business acquisition, sales reported by acquired entity for last annual period	$ 37,000,000
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Business acquisition, goodwill, tax deductible amount				$ 7,400,000
Business acquisitions purchase price allocation goodwill amount						7,600,000
Business acquisitions purchase price allocation intangible assets other than goodwill						$ 11,400,000

Acquisitions - Schedule of Reco

Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017
Business Combination Separately Recognized Transactions [Line Items]
Goodwill	$ 2,489,730	$ 2,491,779		$ 1,251,825	$ 1,251,986
Goodwill	(513)
Allied Acquisition [Member]
Business Combination Separately Recognized Transactions [Line Items]
Cash	169		$ 19,322
Accounts receivable	337,549		315,485
Inventory	314,785		322,705
Prepaid and other current assets	75,440		59,279
Property, plant, and equipment	139,360		139,528
Goodwill	1,232,780		1,130,635
Intangible assets	1,037,000		1,037,000
Current liabilities	(259,289)		(271,252)
Non-current liabilities	(723)		(6,820)
Total purchase price	2,877,071		$ 2,745,882
Cash	(19,153)
Accounts receivable	22,064
Inventory	(7,920)
Prepaid and other current assets	16,161
Property, plant, and equipment	(168)
Goodwill	102,145
Current liabilities	11,963
Non-current liabilities	6,097
Total purchase price	$ 131,189

Acquisitions - Business Acquisi

Acquisitions - Business Acquisition, Pro Forma Information (Detail) $ in Thousands	3 Months Ended
	Dec. 31, 2017USD ($)
Business Acquisition Pro Forma Information [Abstract]
Net sales	$ 1,787,628
Net income (loss)	$ 32,257

Net Sales - Summary of Net Sale

Net Sales - Summary of Net Sales by Product Line and Geography (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Net sales	$ 1,721,676	$ 1,121,979
Residential Roofing Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	732,190
Non-Residential Roofing Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	419,909
Complementary Building Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	569,577
U.S. [Member]
Disaggregation Of Revenue [Line Items]
Net sales	1,678,895
U.S. [Member] \| Residential Roofing Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	720,511
U.S. [Member] \| Non-Residential Roofing Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	390,268
U.S. [Member] \| Complementary Building Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	568,116
Canada [Member]
Disaggregation Of Revenue [Line Items]
Net sales	42,781
Canada [Member] \| Residential Roofing Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	11,679
Canada [Member] \| Non-Residential Roofing Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	29,641
Canada [Member] \| Complementary Building Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 1,461

Net Income (Loss) Per Share - C

Net Income (Loss) Per Share - Components and Calculation of Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income (loss)		$ (893)	$ 67,596
Dividends on preferred shares	[1]	(6,000)	0
Net income (loss) attributable to common shareholders		(6,893)	67,596
Net income (loss) attributable to common shareholders - basic and diluted		$ (6,893)	$ 67,596
Weighted-average common shares outstanding - basic		68,248,020	67,825,430
Effect of common share equivalents			1,419,248
Weighted-average common shares outstanding - diluted		68,248,020	69,244,678
Net income (loss) per share - basic	[2]	$ (0.10)	$ 1
Net income (loss) per share - diluted	[2]	$ (0.10)	$ 0.98

[1]	Three months ended December 31, 2018 amount is composed of $5.0 million in undeclared cumulative Preferred Stock dividends as well as an additional $1.0 million of Preferred Stock dividends that had been declared and paid as of period end. See Note 3 for further discussion.
[2]	See Note 5 for detailed calculations and further discussion.

Net Income (Loss) Per Share - S

Net Income (Loss) Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of diluted net income (loss) per share	9,694,619
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of diluted net income (loss) per share	1,554,518	288,275
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of diluted net income (loss) per share	318,229

Stock-based Compensation - Addi

Stock-based Compensation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Feb. 09, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation number of shares authorized			5,000,000
Stock-based compensation number of shares available for awards	1,772,191
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares that will vest	100.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-qualified options granted expiration period	10 years
Vesting period	3 years
Allocated stock-based compensation expense	$ 1	$ 1.1
Unrecognized compensation cost related to unvested stock	$ 8.1
Unrecognized compensation cost related to unvested stock, expected weighted-average period of recognition	2 years 3 months 18 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated stock-based compensation expense	$ 2.4	$ 2.4
Unrecognized compensation cost related to unvested stock	$ 27.2
Unrecognized compensation cost related to unvested stock, expected weighted-average period of recognition	2 years 3 months 18 days
Restricted Stock Units (RSUs) [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares that will vest	0.00%
Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares that will vest	200.00%

Stock-based Compensation - Fair

Stock-based Compensation - Fair Value of Options, Black-Scholes Option-Pricing Model, Assumptions (Detail)	3 Months Ended
	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Risk-free interest rate	3.00%
Expected volatility	29.34%
Expected life (in years)	5 years 2 months 4 days
Dividend yield	0.00%

Stock-based compensation - Stoc

Stock-based compensation - Stock Options Outstanding and Activity During the Period (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018
Options Outstanding
Balance as of September 30, 2018	1,969,037
Granted	605,184
Exercised	(48,800)
Canceled/Forfeited	(12,967)
Expired	(950)
Balance as of December 31, 2018	2,511,504	1,969,037
Vested and expected to vest after December 31, 2018	2,455,082
Exercisable as of December 31, 2018	1,645,162
Weighted-Average Exercise Price
Beginning Balance	$ 33.08
Granted	27.26
Exercised	17.11
Canceled/Forfeited	41.12
Expired	12.25
Ending Balance	31.96	$ 33.08
Vested and expected to vest after December 31, 2018	31.94
Exercisable as of December 31, 2018	$ 30.75
Weighted-Average Remaining Contractual Life
Balance	6 years 7 months 6 days	5 years 8 months 12 days
Vested and expected to vest after December 31, 2018	6 years 6 months
Exercisable as of December 31, 2018	5 years 1 month 6 days
Aggregate Intrinsic Value
Balance	$ 11,478	$ 14,088
Vested and expected to vest after December 31, 2018	11,275
Exercisable as of December 31, 2018	$ 8,511

Stock-based compensation - St_2

Stock-based compensation - Stock Option Grants, Vesting, and Exercises (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Weighted-average fair value of stock options granted	$ 8.75	$ 15.86
Total grant date fair value of stock options vested	$ 3,680	$ 3,773
Total intrinsic value of stock options exercised	$ 712	$ 5,448

Stock-based Compensation - Rest

Stock-based Compensation - Restricted Shares and Units Outstanding and Activity During the Period (Detail) - $ / shares	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Weighted - Average Grant Date Fair Value
Granted	$ 27.28	$ 55.17
Restricted Stock Units (RSUs) [Member]
Outstanding
Balance as of September 30, 2018	934,023
Granted	630,745
Released	(366,779)
Canceled/Forfeited	(77,455)
Balance as of December 31, 2018	1,120,534
Vested and expected to vest after December 31, 2018	1,040,181
Weighted - Average Grant Date Fair Value
Balance as of September 30, 2018	$ 47
Granted	27.28
Released	40.46
Canceled/Forfeited	47.52
Balance as of December 31, 2018	38
Vested and expected to vest after December 31, 2018	$ 37.78

Stock-based Compensation - Sche

Stock-based Compensation - Schedule Of Restricted Stock Units Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Weighted-average fair value of RSUs granted	$ 27.28	$ 55.17
Total grant date fair value of RSUs vested	$ 14,840	$ 5,786
Total intrinsic value of RSUs released	$ 11,160	$ 10,683

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Summary of Changes in goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance	$ 2,491,779	$ 1,251,986
Acquisitions	(513)
Translation and other adjustments	(1,536)	(161)
Ending balance	$ 2,489,730	$ 1,251,825

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Goodwill And Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 1,050,000
Amortization of Intangible Assets	$ 52,021	$ 18,195
Minimum [Member]
Goodwill And Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Maximum [Member]
Goodwill And Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Weighted Average [Member]
Goodwill And Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	18 years 2 months 12 days
Trademarks [Member]
Goodwill And Intangible Assets [Line Items]
Indefinite-lived Intangible Assets Acquired			120,000
Customer Relationships [Member]
Goodwill And Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			920,800
Customer Relationships [Member] \| Weighted Average [Member]
Goodwill And Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	18 years 4 months 17 days
Beneficial Lease Arrangements [Member]
Goodwill And Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 7,000
Beneficial Lease Arrangements [Member] \| Weighted Average [Member]
Goodwill And Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years 2 months 26 days

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Amortizable intangible assets	$ 1,552,132	$ 1,551,949	$ 624,368
Accumulated amortization	(462,940)	(410,633)	(286,561)
Total amortizable intangible assets, net	1,089,192	1,141,316	337,807
Indefinite lived trademarks	193,050	193,050	73,050
Total intangibles, net	$ 1,282,242	1,334,366	410,857
Weighted Average [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	18 years 2 months 12 days
Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Noncompete Agreements [Member]
Finite Lived Intangible Assets [Line Items]
Amortizable intangible assets	$ 2,824	2,824	2,824
Noncompete Agreements [Member] \| Weighted Average [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years 5 months 19 days
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Amortizable intangible assets	$ 1,530,748	1,530,565	609,984
Customer Relationships [Member] \| Weighted Average [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	18 years 4 months 17 days
Trademarks [Member]
Finite Lived Intangible Assets [Line Items]
Amortizable intangible assets	$ 10,500	10,500	10,500
Trademarks [Member] \| Weighted Average [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years 4 months 28 days
Beneficial Lease Arrangements [Member]
Finite Lived Intangible Assets [Line Items]
Amortizable intangible assets	$ 8,060	$ 8,060	$ 1,060
Beneficial Lease Arrangements [Member] \| Weighted Average [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years 2 months 26 days

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Summary of Estimated Future Amortization (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
2019 (Jan - Sept)	$ 156,534
2,020	179,541
2,021	149,974
2,022	121,426
2,023	97,517
Thereafter	384,200
Total amortizable intangible assets, net	$ 1,089,192	$ 1,141,316	$ 337,807

Financing Arrangements - Long-t

Financing Arrangements - Long-term Debt Instruments (Detail) - USD ($)		Dec. 31, 2018		Sep. 30, 2018		Jan. 02, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Borrowings under revolving lines of credit/term loans, net		$ 503,216,000		$ 92,442,000
Current portion		0		0			$ 0
Long-term borrowings under senior notes		1,574,721,000		1,573,699,000			1,570,731,000
Long-term debt, net		2,497,123,000		2,494,725,000			2,000,059,000
Equipment financing facilities, various maturities through September 2021	[1]	10,148,000		11,222,000			11,657,000
Capital lease obligations, various maturities through November 2021	[2]	11,156,000		12,378,000			19,033,000
Long-term obligations under equipment financing and other, net		10,689,000		13,639,000			20,951,000
Senior Notes, Matures October 2023 [Member]
Debt Instrument [Line Items]
Senior Notes	[3]	293,926,000		293,607,000			292,648,000
Senior Notes, Matures November 2025 [Member]
Debt Instrument [Line Items]
Senior Notes	[4]	1,280,795,000		1,280,092,000			1,278,083,000
Equipment Financing Facilities and Other [Member]
Debt Instrument [Line Items]
Current portion		(10,615,000)		(9,961,000)			(9,739,000)
Long-term obligations under equipment financing and other, net		10,689,000		13,639,000			20,951,000
Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Borrowings under revolving lines of credit/term loans, net		503,216,000		92,442,000
Revolving Lines of Credit [Member] \| 2023 ABL [Member]
Debt Instrument [Line Items]
Borrowings under revolving lines of credit/term loans, net		503,200,000
Revolving Lines of Credit [Member] \| 2023 ABL [Member] \| U.S. [Member]
Debt Instrument [Line Items]
Total Borrowings under revolving lines of credit/term loans	[5]	496,619,000		89,352,000
Revolving Lines of Credit [Member] \| 2023 ABL [Member] \| Canada [Member]
Debt Instrument [Line Items]
Total Borrowings under revolving lines of credit/term loans	[6]	6,597,000		3,090,000
Term Loan [Member]
Debt Instrument [Line Items]
Current portion		(9,700,000)		(9,700,000)			(4,500,000)
Borrowings under revolving lines of credit/term loans, net		922,402,000		921,026,000			429,328,000
Term Loan [Member] \| Term Loan, Matures October 2022 [Member]
Debt Instrument [Line Items]
Total Borrowings under revolving lines of credit/term loans	[7]						$ 433,828,000
Term Loan [Member] \| Term Loan, Matures January 2025 [Member]
Debt Instrument [Line Items]
Total Borrowings under revolving lines of credit/term loans		$ 932,102,000	[8]	$ 930,726,000	[8]	$ 970,000,000

[1]	Fixed interest rates ranging from 2.33% to 3.25% as of December 31, 2018, September 30, 2017, and December 31, 2017.
[2]	Fixed interest rates ranging from 2.72% to 10.39% as of December 31, 2018 , September 30, 2017, and December 31, 2017.
[3]	Interest rate of 6.38% as of December 31, 2018, September 30, 2017 and December 31, 2017.
[4]	Interest rate of 4.88% as of December 31, 2018, September 30, 2017 and December 31, 2017.
[5]	Effective rate on borrowings of 4.37% and 3.36% as of December 31, 2018 and September 30, 2018, respectively.
[6]	Effective rate on borrowings of 4.45% and 3.95% as of December 31, 2018 and September 30, 2018, respectively.
[7]	Extinguished on January 2, 2018; Interest rate of 4.06% as of December 31, 2017.
[8]	Interest rate of 4.77% and 4.53% as of December 31, 2018 and September 30, 2018, respectively.

Financing Arrangements - Long_2

Financing Arrangements - Long-term Debt Instruments (Parenthetical) (Detail)	Jan. 02, 2018	Oct. 01, 2015	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Equipment Financing Facilities [Member]
Debt Instrument [Line Items]
Debt instrument maturity date			Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2021
Equipment Financing Facilities [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Equipment financing facilities, fixed interest rate percentage			2.33%	2.33%		2.33%
Equipment Financing Facilities [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Equipment financing facilities, fixed interest rate percentage			3.25%	3.25%		3.25%
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt instrument maturity date			Nov. 30, 2021	Nov. 30, 2021	Nov. 30, 2021
Capital Lease Obligations [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Capital lease obligations, fixed interest rate percentage			2.72%	2.72%		2.72%
Capital Lease Obligations [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Capital lease obligations, fixed interest rate percentage			10.39%	10.39%		10.39%
Senior Notes, Matures October 2023 [Member]
Debt Instrument [Line Items]
Debt interest rate at period end			6.38%	6.38%		6.38%
Debt instrument maturity date		Oct. 1, 2023	Oct. 1, 2023	Oct. 1, 2023	Oct. 1, 2023
Senior Notes, Matures November 2025 [Member]
Debt Instrument [Line Items]
Debt interest rate at period end			4.88%	4.88%		4.88%
Debt instrument maturity date			Nov. 1, 2025	Nov. 1, 2025	Nov. 1, 2025
Revolving Lines of Credit [Member] \| 2023 ABL [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	Jan. 2, 2023
Revolving Lines of Credit [Member] \| 2023 ABL [Member] \| U.S. [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End			4.37%		3.36%
Line of Credit Facility, Expiration Date			Jan. 2, 2023	Jan. 2, 2023	Jan. 2, 2023
Revolving Lines of Credit [Member] \| 2023 ABL [Member] \| Canada [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End			4.45%		3.95%
Line of Credit Facility, Expiration Date			Jan. 2, 2023	Jan. 2, 2023	Jan. 2, 2023
Term Loan [Member] \| Term Loan, Matures October 2022 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End				4.06%
Line of Credit Facility, Expiration Date			Oct. 1, 2022	Oct. 1, 2022	Oct. 1, 2022
Debt extinguishment date				Jan. 2, 2018
Term Loan [Member] \| Term Loan, Matures January 2025 [Member]
Debt Instrument [Line Items]
Debt interest rate at period end			4.77%		4.53%
Debt instrument maturity date	Jan. 2, 2025		Jan. 2, 2025	Jan. 2, 2025	Jan. 2, 2025

Financing Arrangements - Financ

Financing Arrangements - Financing - Allied Acquisition - Additional Information (Detail) - USD ($)	Jan. 02, 2018	Dec. 31, 2018		Dec. 31, 2017	Sep. 30, 2018	[1]	Oct. 01, 2015
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 3,570,000,000						$ 1,450,000,000
Borrowings under senior notes		$ 0		$ 1,300,000,000
Payments of debt issuance costs	65,300,000	0		$ 21,917,000
Allied Financing Arrangements [Member]
Debt Instrument [Line Items]
Payments of debt issuance costs	2,000,000
Gains (Losses) on Extinguishment of Debt	(1,700,000)
Senior Notes, Matures November 2025 [Member]
Debt Instrument [Line Items]
Borrowings under senior notes	1,300,000,000
Revolving Lines of Credit [Member] \| 2023 ABL [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,300,000,000
Proceeds from Lines of Credit	525,000,000
Term Loan [Member] \| Term Loan, Matures January 2025 [Member]
Debt Instrument [Line Items]
Long-term line of credit	$ 970,000,000	$ 932,102,000	[1]		$ 930,726,000

[1]	Interest rate of 4.77% and 4.53% as of December 31, 2018 and September 30, 2018, respectively.

Financing Arrangements - 2023 A

Financing Arrangements - 2023 ABL - Additional Information (Detail)	Jan. 02, 2018USD ($)	Dec. 31, 2018USD ($)Covenant	Sep. 30, 2018USD ($)	Oct. 01, 2015USD ($)
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 3,570,000,000			$ 1,450,000,000
Borrowings under revolving lines of credit/term loans, net		$ 503,216,000	$ 92,442,000
Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Borrowings under revolving lines of credit/term loans, net		$ 503,216,000	$ 92,442,000
Revolving Lines of Credit [Member] \| 2023 ABL [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,300,000,000
Debt instrument maturity date	Jan. 2, 2023
Line of credit facility, unused fees		0.25%
Number of financial covenants \| Covenant		1
Fixed charge coverage ratio		100.00%
Borrowings under revolving lines of credit/term loans, net		$ 503,200,000
Unamortized debt issuance costs		10,000,000
U.S. [Member] \| Revolving Lines of Credit [Member] \| 2023 ABL [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,200,000,000
Standby letters of credit outstanding		$ 13,400,000
Canada [Member] \| Revolving Lines of Credit [Member] \| 2023 ABL [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000,000

Financing Arrangements - 2025 T

Financing Arrangements - 2025 Term Loan - Additional Information (Detail) - Term Loan [Member] - Term Loan, Matures January 2025 [Member] - USD ($)	Jan. 02, 2018	Dec. 31, 2018		Dec. 31, 2017	Sep. 30, 2018
Debt Instrument [Line Items]
Long-term line of credit	$ 970,000,000	$ 932,102,000	[1]		$ 930,726,000	[1]
Debt Instrument, Frequency of Periodic Payment		quarterly
Debt Instrument, Periodic Payment	$ 2,400,000
Debt instrument maturity date	Jan. 2, 2025	Jan. 2, 2025		Jan. 2, 2025	Jan. 2, 2025
Unamortized debt issuance costs		$ 33,000,000

[1]	Interest rate of 4.77% and 4.53% as of December 31, 2018 and September 30, 2018, respectively.

Financing Arrangements - 2025 S

Financing Arrangements - 2025 Senior Notes - Additional Information (Detail) - Senior Notes, Matures November 2025 [Member] - USD ($)		3 Months Ended		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018	Oct. 25, 2017	Sep. 30, 2017
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount					$ 1,300,000,000
Debt instrument interest rate		4.88%	4.88%			4.88%
Debt instrument, issue price percentage					100.00%
Debt instrument maturity date		Nov. 1, 2025	Nov. 1, 2025	Nov. 1, 2025
Senior Notes Payable	[1]	$ 1,280,795,000	$ 1,278,083,000	$ 1,280,092,000
Unamortized debt issuance costs		$ 19,200,000

[1]	Interest rate of 4.88% as of December 31, 2018, September 30, 2017 and December 31, 2017.

Financing Arrangements - Fina_2

Financing Arrangements - Financing - RSG Acquisition - Additional Information (Detail) - USD ($)	Jan. 02, 2018	Oct. 01, 2015	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 3,570,000,000	$ 1,450,000,000
Borrowings under senior notes			$ 0	$ 1,300,000,000
Payments of debt issuance costs	$ 65,300,000		0	$ 21,917,000
Roofing Supply Group [Member]
Debt Instrument [Line Items]
Payments of debt issuance costs			$ 31,300,000
Roofing Supply Group [Member] \| Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument maturity year			2,020
2020 ABL [Member] \| Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		700,000,000
Proceeds from Lines of Credit		350,000,000
2022 Term Loan [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Long-term line of credit		450,000,000
Senior Notes, Matures October 2023 [Member]
Debt Instrument [Line Items]
Borrowings under senior notes		$ 300,000,000

Financing Arrangements - 2020 A

Financing Arrangements - 2020 ABL - Additional Information (Detail) - USD ($)	Oct. 01, 2015	Jan. 02, 2018
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,450,000,000	$ 3,570,000,000
Revolving Lines of Credit [Member] \| 2020 ABL [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 700,000,000
Debt instrument maturity date	Oct. 1, 2020
Debt instrument paid off date	Jan. 2, 2018
U.S. [Member] \| Revolving Lines of Credit [Member] \| 2020 ABL [Member]
Debt Instrument [Line Items]
Long-term line of credit	$ 670,000,000
Canada [Member] \| Revolving Lines of Credit [Member] \| 2020 ABL [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 30,000,000

Financing Arrangements - 2022 T

Financing Arrangements - 2022 Term Loan - Additional Information (Detail) - Term Loan [Member] - 2022 Term Loan [Member] - USD ($) $ in Millions	Oct. 01, 2015	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term line of credit	$ 450
Debt instrument paid off date	Jan. 2, 2018
Write off of debt issuance costs	$ 0.7
Debt Instrument, Frequency of Periodic Payment		quarterly
Debt Instrument, Periodic Payment	$ 1.1
Debt instrument maturity date	Oct. 1, 2022

Financing Arrangements - 2023 S

Financing Arrangements - 2023 Senior Notes - Additional Information (Detail) - USD ($) $ in Thousands		Oct. 01, 2015	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Debt Instrument [Line Items]
Borrowings under senior notes			$ 0	$ 1,300,000
Senior Notes, Matures October 2023 [Member]
Debt Instrument [Line Items]
Borrowings under senior notes		$ 300,000
Debt instrument maturity date		Oct. 1, 2023	Oct. 1, 2023	Oct. 1, 2023	Oct. 1, 2023
Debt instrument, coupon rate		6.38%
Unamortized debt issuance costs			$ 6,100
Senior Notes Payable	[1]		$ 293,926	$ 292,648	$ 293,607

[1]	Interest rate of 6.38% as of December 31, 2018, September 30, 2017 and December 31, 2017.

Financing Arrangements - Equipm

Financing Arrangements - Equipment Financing Facilities and Other - Additional Information (Detail) - USD ($)		3 Months Ended		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Debt Instrument [Line Items]
Equipment financing facilities, various maturities through September 2021	[1]	$ 10,148,000	$ 11,657,000	$ 11,222,000
Capital lease obligations, various maturities through November 2021	[2]	$ 11,156,000	$ 19,033,000	$ 12,378,000
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt instrument maturity date		Nov. 30, 2021	Nov. 30, 2021	Nov. 30, 2021
Capital lease obligations, various maturities through November 2021		$ 11,200,000
Equipment Financing Facilities and Other [Member]
Debt Instrument [Line Items]
Equipment financing facilities, various maturities through September 2021		$ 10,100,000
Debt instrument maturity date		Sep. 30, 2021
Minimum [Member] \| Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital Leases of Lessor, Contingent Rentals, Basis Spread on Variable Rate		2.72%
Minimum [Member] \| Equipment Financing Facilities and Other [Member]
Debt Instrument [Line Items]
Percentage of Fixed Interest Rate of Equipment Financing Facilities		2.33%
Maximum [Member] \| Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital Leases of Lessor, Contingent Rentals, Basis Spread on Variable Rate		10.39%
Maximum [Member] \| Equipment Financing Facilities and Other [Member]
Debt Instrument [Line Items]
Percentage of Fixed Interest Rate of Equipment Financing Facilities		3.25%

[1]	Fixed interest rates ranging from 2.33% to 3.25% as of December 31, 2018, September 30, 2017, and December 31, 2017.
[2]	Fixed interest rates ranging from 2.72% to 10.39% as of December 31, 2018 , September 30, 2017, and December 31, 2017.

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Minimum Rental Commitments under Non-cancelable Operating Leases (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Commitments And Contingencies Disclosure [Abstract]
2019 (Jan - Sept)	$ 110,514
2,020	101,743
2,021	90,734
2,022	71,869
2,023	55,048
Thereafter	146,410
Total minimum lease payments	$ 576,318

Commitments and Contingencies_2

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense, Net, Total	$ 27.5	$ 15.2

Geographic Data - Schedule Of G

Geographic Data - Schedule Of Geographic Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Long-lived assets	$ 1,364,177	$ 1,422,966	$ 501,362
U.S. [Member]
Segment Reporting Information [Line Items]
Long-lived assets	1,352,081	1,409,742	488,137
Canada [Member]
Segment Reporting Information [Line Items]
Long-lived assets	$ 12,096	$ 13,224	$ 13,225

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) - (Additional Information) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Change in accumulated other comprehensive income (loss)	$ (3,910)	$ 57
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Change in accumulated other comprehensive income (loss)	(3,900)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Reclassifications out of other comprehensive income (loss)	$ 0

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail) - Fair Value, Inputs, Level 2 [Member] $ in Millions	3 Months Ended
	Dec. 31, 2018USD ($)
Senior Notes Due in 2023 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Debt instrument maturity year	2,023
Senior Notes Due in 2025 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Debt instrument maturity year	2,025
Carrying Value [Member] \| Senior Notes Due in 2023 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Senior notes	$ 300
Carrying Value [Member] \| Senior Notes Due in 2025 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Senior notes	1,300
Fair Value [Member] \| Senior Notes Due in 2023 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Senior notes	299.3
Fair Value [Member] \| Senior Notes Due in 2025 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Senior notes	$ 1,150

Supplemental Guarantor Inform_3

Supplemental Guarantor Information - Condensed Consolidating Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Current assets:
Cash and cash equivalents	$ 18,423	$ 129,927	$ 63,827
Restricted cash			1,300,000
Accounts receivable, net	881,749	1,090,533	552,703
Inventories, net	1,025,310	936,047	603,793
Prepaid expenses and other current assets	375,598	244,360	218,718
Total current assets	2,301,080	2,400,867	2,739,041
Intercompany receivable, net	0	0	0
Investments in consolidated subsidiaries	0	0	0
Deferred income taxes, net	0	0	0
Property and equipment, net	273,742	280,407	154,687
Goodwill	2,489,730	2,491,779	1,251,825	$ 1,251,986
Intangibles, net	1,282,242	1,334,366	410,857
Other assets, net	1,243	1,243	8,868
Total assets	6,348,037	6,508,662	4,565,278
Current liabilities:
Accounts payable	551,940	880,872	315,442
Accrued expenses	375,672	611,539	266,049
Current portions of long-term debt/obligations	20,315	19,661	14,239
Total current liabilities	947,927	1,512,072	595,730
Intercompany payable, net	0	0	0
Borrowings under revolving lines of credit, net	503,216	92,442
Long-term debt, net	2,497,123	2,494,725	2,000,059
Deferred income taxes, net	110,179	106,994	93,451
Long-term obligations under equipment financing and other, net	10,689	13,639	20,951
Other long-term liabilities	5,532	5,290	2,743
Total liabilities	4,074,666	4,225,162	2,712,934
Convertible preferred stock	399,195	399,195
Total stockholders' equity	1,874,176	1,884,305	1,852,344	$ 1,781,806
Total liabilities and stockholders' equity	6,348,037	6,508,662	4,565,278
Reportable Legal Entities [Member] \| Parent Company [Member]
Current assets:
Cash and cash equivalents	0	0	0
Restricted cash			0
Accounts receivable, net	0	0	0
Inventories, net	0	0	0
Prepaid expenses and other current assets	6,065	23,711	17,713
Total current assets	6,065	23,711	17,713
Intercompany receivable, net	0	0	0
Investments in consolidated subsidiaries	6,289,626	6,109,325	3,239,031
Deferred income taxes, net	20,767	22,475	18,286
Property and equipment, net	19,775	18,929	8,271
Goodwill	0	0	0
Intangibles, net	0	0	0
Other assets, net	1,243	1,243	3,341
Total assets	6,337,476	6,175,683	3,286,642
Current liabilities:
Accounts payable	28,808	24,154	21,511
Accrued expenses	40,834	41,448	27,467
Current portions of long-term debt/obligations	9,700	9,700	4,500
Total current liabilities	79,342	75,302	53,478
Intercompany payable, net	1,487,640	1,322,156	680,761
Borrowings under revolving lines of credit, net	0	0
Long-term debt, net	2,497,123	2,494,725	700,059
Deferred income taxes, net	0	0	0
Long-term obligations under equipment financing and other, net	0	0	0
Other long-term liabilities	0	0	0
Total liabilities	4,064,105	3,892,183	1,434,298
Convertible preferred stock	399,195	399,195
Total stockholders' equity	1,874,176	1,884,305	1,852,344
Total liabilities and stockholders' equity	6,337,476	6,175,683	3,286,642
Reportable Legal Entities [Member] \| Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	30,877	136,499	70,698
Restricted cash			0
Accounts receivable, net	856,373	1,051,410	526,068
Inventories, net	998,450	907,605	581,288
Prepaid expenses and other current assets	361,431	214,011	194,007
Total current assets	2,247,131	2,309,525	1,372,061
Intercompany receivable, net	1,526,435	1,361,615	730,364
Investments in consolidated subsidiaries	0	0	0
Deferred income taxes, net	0	0	0
Property and equipment, net	243,911	250,517	135,925
Goodwill	2,461,212	2,461,725	1,220,813
Intangibles, net	1,280,202	1,332,104	408,123
Other assets, net	0	0	5,527
Total assets	7,758,891	7,715,486	3,872,813
Current liabilities:
Accounts payable	532,526	843,907	296,547
Accrued expenses	327,027	564,331	232,131
Current portions of long-term debt/obligations	10,615	9,961	9,739
Total current liabilities	870,168	1,418,199	538,417
Intercompany payable, net	0	0	0
Borrowings under revolving lines of credit, net	496,619	89,352
Long-term debt, net	0	0	0
Deferred income taxes, net	130,847	128,846	111,066
Long-term obligations under equipment financing and other, net	10,689	13,639	20,881
Other long-term liabilities	5,453	5,207	2,743
Total liabilities	1,513,776	1,655,243	673,107
Convertible preferred stock	0	0
Total stockholders' equity	6,245,115	6,060,243	3,199,706
Total liabilities and stockholders' equity	7,758,891	7,715,486	3,872,813
Reportable Legal Entities [Member] \| Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	2,775	1,959	2,122
Restricted cash			1,300,000
Accounts receivable, net	26,516	40,262	27,775
Inventories, net	26,860	28,442	22,505
Prepaid expenses and other current assets	8,102	6,638	6,998
Total current assets	64,253	77,301	1,359,400
Intercompany receivable, net	0	0	0
Investments in consolidated subsidiaries	0	0	0
Deferred income taxes, net	0	0	0
Property and equipment, net	10,056	10,961	10,491
Goodwill	28,518	30,054	31,012
Intangibles, net	2,040	2,262	2,734
Other assets, net	0	0	0
Total assets	104,867	120,578	1,403,637
Current liabilities:
Accounts payable	6,975	22,482	7,517
Accrued expenses	7,811	5,760	6,451
Current portions of long-term debt/obligations	0	0	0
Total current liabilities	14,786	28,242	13,968
Intercompany payable, net	38,795	39,459	49,603
Borrowings under revolving lines of credit, net	6,597	3,090
Long-term debt, net	0	0	1,300,000
Deferred income taxes, net	99	622	671
Long-term obligations under equipment financing and other, net	0	0	70
Other long-term liabilities	79	83	0
Total liabilities	60,356	71,496	1,364,312
Convertible preferred stock	0	0
Total stockholders' equity	44,511	49,082	39,325
Total liabilities and stockholders' equity	104,867	120,578	1,403,637
Eliminations and Other [Member]
Current assets:
Cash and cash equivalents	(15,229)	(8,531)	(8,993)
Restricted cash			0
Accounts receivable, net	(1,140)	(1,139)	(1,140)
Inventories, net	0	0	0
Prepaid expenses and other current assets	0	0	0
Total current assets	(16,369)	(9,670)	(10,133)
Intercompany receivable, net	(1,526,435)	(1,361,615)	(730,364)
Investments in consolidated subsidiaries	(6,289,626)	(6,109,325)	(3,239,031)
Deferred income taxes, net	(20,767)	(22,475)	(18,286)
Property and equipment, net	0	0	0
Goodwill	0	0	0
Intangibles, net	0	0	0
Other assets, net	0	0	0
Total assets	(7,853,197)	(7,503,085)	(3,997,814)
Current liabilities:
Accounts payable	(16,369)	(9,671)	(10,133)
Accrued expenses	0	0	0
Current portions of long-term debt/obligations	0	0	0
Total current liabilities	(16,369)	(9,671)	(10,133)
Intercompany payable, net	(1,526,435)	(1,361,615)	(730,364)
Borrowings under revolving lines of credit, net	0	0
Long-term debt, net	0	0	0
Deferred income taxes, net	(20,767)	(22,474)	(18,286)
Long-term obligations under equipment financing and other, net	0	0	0
Other long-term liabilities	0	0	0
Total liabilities	(1,563,571)	(1,393,760)	(758,783)
Convertible preferred stock	0	0
Total stockholders' equity	(6,289,626)	(6,109,325)	(3,239,031)
Total liabilities and stockholders' equity	$ (7,853,197)	$ (7,503,085)	$ (3,997,814)

Supplemental Guarantor Inform_4

Supplemental Guarantor Information - Condensed Consolidating Statements of Operations (Detail) - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Net sales		$ 1,721,676	$ 1,121,979
Cost of products sold		1,286,107	852,226
Gross profit		435,569	269,753
Operating expense:
Selling, general and administrative		327,693	193,753
Depreciation		17,601	8,709
Amortization		52,021	18,195
Total operating expense		397,315	220,657
Intercompany charges (income)		0	0
Income (loss) from operations		38,254	49,096
Interest expense, financing costs, and other		38,361	22,568
Intercompany interest expense (income)		0	0
Income (loss) before provision for income taxes		(107)	26,528
Provision for (benefit from) income taxes	[1]	786	(41,068)
Income (loss) before equity in net income of subsidiaries		(893)	67,596
Equity in net income of subsidiaries		0	0
Net income (loss)		(893)	67,596
Reportable Legal Entities [Member] \| Parent Company [Member]
Net sales		0	0
Cost of products sold		0	0
Gross profit		0	0
Operating expense:
Selling, general and administrative		9,775	(133)
Depreciation		764	456
Amortization		0	0
Total operating expense		10,539	323
Intercompany charges (income)		(6,687)	893
Income (loss) from operations		(3,852)	(1,216)
Interest expense, financing costs, and other		34,313	10,076
Intercompany interest expense (income)		(9,680)	(5,708)
Income (loss) before provision for income taxes		(28,485)	(5,584)
Provision for (benefit from) income taxes		(7,354)	5,521
Income (loss) before equity in net income of subsidiaries		(21,131)	(11,105)
Equity in net income of subsidiaries		20,238	78,701
Net income (loss)		(893)	67,596
Reportable Legal Entities [Member] \| Guarantor Subsidiaries [Member]
Net sales		1,678,895	1,076,262
Cost of products sold		1,252,295	816,436
Gross profit		426,600	259,826
Operating expense:
Selling, general and administrative		309,548	184,881
Depreciation		16,372	7,810
Amortization		51,911	18,064
Total operating expense		377,831	210,755
Intercompany charges (income)		6,687	(893)
Income (loss) from operations		42,082	49,964
Interest expense, financing costs, and other		3,485	825
Intercompany interest expense (income)		9,298	5,321
Income (loss) before provision for income taxes		29,299	43,818
Provision for (benefit from) income taxes		8,400	(46,672)
Income (loss) before equity in net income of subsidiaries		20,899	90,490
Equity in net income of subsidiaries		0	0
Net income (loss)		20,899	90,490
Reportable Legal Entities [Member] \| Non-Guarantor Subsidiaries [Member]
Net sales		42,781	45,717
Cost of products sold		33,812	35,790
Gross profit		8,969	9,927
Operating expense:
Selling, general and administrative		8,370	9,005
Depreciation		465	443
Amortization		110	131
Total operating expense		8,945	9,579
Intercompany charges (income)		0	0
Income (loss) from operations		24	348
Interest expense, financing costs, and other		563	11,667
Intercompany interest expense (income)		382	387
Income (loss) before provision for income taxes		(921)	(11,706)
Provision for (benefit from) income taxes		(260)	83
Income (loss) before equity in net income of subsidiaries		(661)	(11,789)
Equity in net income of subsidiaries		0	0
Net income (loss)		(661)	(11,789)
Eliminations and Other [Member]
Net sales		0	0
Cost of products sold		0	0
Gross profit		0	0
Operating expense:
Selling, general and administrative		0	0
Depreciation		0	0
Amortization		0	0
Total operating expense		0	0
Intercompany charges (income)		0	0
Income (loss) from operations		0	0
Interest expense, financing costs, and other		0	0
Intercompany interest expense (income)		0	0
Income (loss) before provision for income taxes		0	0
Provision for (benefit from) income taxes		0	0
Income (loss) before equity in net income of subsidiaries		0	0
Equity in net income of subsidiaries		(20,238)	(78,701)
Net income (loss)		$ (20,238)	$ (78,701)

[1]	Three months ended December 31, 2017 amount includes a $46.5 million non-recurring net tax benefit resulting from the enactment of the 2017 Tax Cuts and Jobs Act (“TCJA”). As of December 31, 2018, the Company had completed its analysis of the impact of the TCJA in accordance with SEC Staff Accounting Bulletin No. 118. There were no adjustments to the provisional amounts during the three months ended December 31, 2018.

Supplemental Guarantor Inform_5

Supplemental Guarantor Information - Condensed Consolidating Statements of Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net income (loss)	$ (893)	$ 67,596
Other comprehensive income (loss):
Foreign currency translation adjustment	(3,910)	57
Total other comprehensive income (loss)	(3,910)	57
Comprehensive income (loss)	(4,803)	67,653
Reportable Legal Entities [Member] \| Parent Company [Member]
Net income (loss)	(893)	67,596
Other comprehensive income (loss):
Foreign currency translation adjustment	(3,910)	57
Total other comprehensive income (loss)	(3,910)	57
Comprehensive income (loss)	(4,803)	67,653
Reportable Legal Entities [Member] \| Guarantor Subsidiaries [Member]
Net income (loss)	20,899	90,490
Other comprehensive income (loss):
Foreign currency translation adjustment	0	0
Total other comprehensive income (loss)	0	0
Comprehensive income (loss)	20,899	90,490
Reportable Legal Entities [Member] \| Non-Guarantor Subsidiaries [Member]
Net income (loss)	(661)	(11,789)
Other comprehensive income (loss):
Foreign currency translation adjustment	(3,910)	57
Total other comprehensive income (loss)	(3,910)	57
Comprehensive income (loss)	(4,571)	(11,732)
Eliminations and Other [Member]
Net income (loss)	(20,238)	(78,701)
Other comprehensive income (loss):
Foreign currency translation adjustment	3,910	(57)
Total other comprehensive income (loss)	3,910	(57)
Comprehensive income (loss)	$ (16,328)	$ (78,758)

Supplemental Guarantor Inform_6

Supplemental Guarantor Information - Condensed Consolidating Statements of Cash Flows (Detail) - USD ($) $ in Thousands	Jan. 02, 2018	Dec. 31, 2018	Dec. 31, 2017
Net cash provided by (used in) operating activities		$ (336,883)	$ (40,456)
Investing Activities
Purchases of property and equipment		(11,688)	(7,416)
Acquisition of businesses, net		(163,973)	0
Proceeds from the sale of assets		401	413
Intercompany activity		0	0
Net cash provided by (used in) investing activities		(175,260)	(7,003)
Financing Activities
Borrowings under revolving lines of credit		1,298,654	17,402
Repayments under revolving lines of credit		(888,225)	(20,548)
Repayments under term loan			0
Borrowings under senior notes		0	1,300,000
Payment of debt issuance costs	$ (65,300)	0	(21,917)
Repayments under equipment financing facilities and other		(1,465)	(1,968)
Payment of dividends on preferred stock		(6,000)	0
Payment of issuance costs from secondary offering of common stock			(429)
Proceeds from issuance of common stock related to equity awards		834	3,781
Taxes paid related to net share settlement of equity awards		(3,617)	(3,925)
Intercompany activity		0	0
Net cash provided by (used in) financing activities		400,181	1,272,396
Effect of exchange rate changes on cash, cash equivalents, and restricted cash		458	640
Net increase (decrease) in cash, cash equivalents, and restricted cash		(111,504)	1,225,577
Cash, cash equivalents, and restricted cash, beginning of period		129,927	138,250
Cash, cash equivalents, and restricted cash, end of period		18,423	1,363,827
Reportable Legal Entities [Member] \| Parent Company [Member]
Net cash provided by (used in) operating activities		12,792	(37,331)
Investing Activities
Purchases of property and equipment		(1,610)	(2,117)
Acquisition of businesses, net		0	0
Proceeds from the sale of assets		0	0
Intercompany activity		(2,399)	61,938
Net cash provided by (used in) investing activities		(4,009)	59,821
Financing Activities
Repayments under term loan			0
Borrowings under senior notes			0
Payment of debt issuance costs		0	(21,917)
Repayments under equipment financing facilities and other		0	0
Payment of dividends on preferred stock		(6,000)
Payment of issuance costs from secondary offering of common stock			(429)
Proceeds from issuance of common stock related to equity awards		834	3,781
Taxes paid related to net share settlement of equity awards		(3,617)	(3,925)
Intercompany activity		0	0
Net cash provided by (used in) financing activities		(8,783)	(22,490)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash		0	0
Net increase (decrease) in cash, cash equivalents, and restricted cash		0	0
Cash, cash equivalents, and restricted cash, beginning of period		0	0
Cash, cash equivalents, and restricted cash, end of period		0	0
Reportable Legal Entities [Member] \| Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities		(336,407)	2,338
Investing Activities
Purchases of property and equipment		(9,971)	(4,874)
Acquisition of businesses, net		(163,973)	0
Proceeds from the sale of assets		400	398
Intercompany activity		0	0
Net cash provided by (used in) investing activities		(173,544)	(4,476)
Financing Activities
Repayments under term loan			0
Borrowings under senior notes			0
Payment of debt issuance costs		0	0
Repayments under equipment financing facilities and other		(1,465)	(1,973)
Payment of dividends on preferred stock		0
Payment of issuance costs from secondary offering of common stock			0
Proceeds from issuance of common stock related to equity awards		0	0
Taxes paid related to net share settlement of equity awards		0	0
Intercompany activity		(847)	(74,991)
Net cash provided by (used in) financing activities		404,329	(76,963)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash		0	0
Net increase (decrease) in cash, cash equivalents, and restricted cash		(105,622)	(79,101)
Cash, cash equivalents, and restricted cash, beginning of period		136,499	149,799
Cash, cash equivalents, and restricted cash, end of period		30,877	70,698
Reportable Legal Entities [Member] \| Non-Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities		(2,659)	(9,658)
Investing Activities
Purchases of property and equipment		(107)	(425)
Acquisition of businesses, net		0	0
Proceeds from the sale of assets		1	15
Intercompany activity		0	0
Net cash provided by (used in) investing activities		(106)	(410)
Financing Activities
Repayments under term loan			0
Borrowings under senior notes			1,300,000
Payment of debt issuance costs		0	0
Repayments under equipment financing facilities and other		0	5
Payment of dividends on preferred stock		0
Payment of issuance costs from secondary offering of common stock			0
Proceeds from issuance of common stock related to equity awards		0	0
Taxes paid related to net share settlement of equity awards		0	0
Intercompany activity		(561)	13,110
Net cash provided by (used in) financing activities		3,227	1,309,968
Effect of exchange rate changes on cash, cash equivalents, and restricted cash		354	640
Net increase (decrease) in cash, cash equivalents, and restricted cash		816	1,300,540
Cash, cash equivalents, and restricted cash, beginning of period		1,959	1,582
Cash, cash equivalents, and restricted cash, end of period		2,775	1,302,122
Eliminations and Other [Member]
Net cash provided by (used in) operating activities		(10,609)	4,195
Investing Activities
Purchases of property and equipment		0	0
Acquisition of businesses, net		0	0
Proceeds from the sale of assets		0	0
Intercompany activity		2,399	(61,938)
Net cash provided by (used in) investing activities		2,399	(61,938)
Financing Activities
Repayments under term loan			0
Borrowings under senior notes			0
Payment of debt issuance costs		0	0
Repayments under equipment financing facilities and other		0	0
Payment of dividends on preferred stock		0
Payment of issuance costs from secondary offering of common stock			0
Proceeds from issuance of common stock related to equity awards		0	0
Taxes paid related to net share settlement of equity awards		0	0
Intercompany activity		1,408	61,881
Net cash provided by (used in) financing activities		1,408	61,881
Effect of exchange rate changes on cash, cash equivalents, and restricted cash		104	0
Net increase (decrease) in cash, cash equivalents, and restricted cash		(6,698)	4,138
Cash, cash equivalents, and restricted cash, beginning of period		(8,531)	(13,131)
Cash, cash equivalents, and restricted cash, end of period		(15,229)	(8,993)
Revolving Lines of Credit [Member]
Financing Activities
Borrowings under revolving lines of credit		1,298,654	17,402
Repayments under revolving lines of credit		(888,225)	(20,548)
Revolving Lines of Credit [Member] \| Reportable Legal Entities [Member] \| Parent Company [Member]
Financing Activities
Borrowings under revolving lines of credit		0	0
Repayments under revolving lines of credit		0	0
Revolving Lines of Credit [Member] \| Reportable Legal Entities [Member] \| Guarantor Subsidiaries [Member]
Financing Activities
Borrowings under revolving lines of credit		1,285,017	878
Repayments under revolving lines of credit		(878,376)	(877)
Revolving Lines of Credit [Member] \| Reportable Legal Entities [Member] \| Non-Guarantor Subsidiaries [Member]
Financing Activities
Borrowings under revolving lines of credit		13,637	16,524
Repayments under revolving lines of credit		(9,849)	(19,671)
Revolving Lines of Credit [Member] \| Eliminations and Other [Member]
Financing Activities
Borrowings under revolving lines of credit		0	0
Repayments under revolving lines of credit		$ 0	$ 0