Beacon Roofing Supply (BECN) 10-Q 9 May 18 2018 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Mar. 31, 2018	Apr. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
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 Common Stock, Shares Outstanding		68,086,674

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2017
Current assets:
Cash and cash equivalents	$ 16,000	$ 138,250	$ 10,012
Accounts receivable, less allowance of $16,493, $11,829 and $17,140 as of March 31, 2018, September 30, 2017 and March 31, 2017, respectively	832,823	704,527	506,386
Inventories, net	1,005,577	551,924	580,889
Prepaid expenses and other current assets	240,315	209,138	217,389
Total current assets	2,094,715	1,603,839	1,314,676
Property and equipment, net	294,222	156,129	156,380
Goodwill	2,381,620	1,251,986	1,228,059
Intangibles, net	1,410,302	429,069	439,507
Other assets, net	1,511	8,534	1,511
Total Assets	6,182,370	3,449,557	3,140,133
Current liabilities:
Accounts payable	593,559	503,697	486,328
Accrued expenses	348,050	261,297	131,264
Current portions of long-term debt	19,597	14,141	14,014
Total current liabilities	961,206	779,135	631,606
Borrowings under revolving lines of credit, net	424,528	3,205	269,124
Long-term debt, net	2,493,889	721,268	722,101
Deferred income taxes, net	91,101	138,383	137,495
Long-term obligations under equipment financing and other, net	18,313	23,213	28,267
Other long-term liabilities	10,617	2,547	2,372
Total liabilities	3,999,654	1,667,751	1,790,965
Commitments and contingencies (Note 9)
Convertible preferred stock; $0.01 par value; 400,000 shares authorized, issued and outstanding as of March 31, 2018; none authorized, issued and outstanding as of September 30, 2017 or March 31, 2017	399,195
Stockholders' equity:
Common stock (voting); $0.01 par value; 100,000,000 shares authorized; 68,043,284 issued and outstanding as of March 31, 2018; 67,700,858 issued and outstanding as of September 30, 2017; 60,255,320 issued and outstanding at March 31, 2017	680	677	602
Undesignated preferred stock; 5,000,000 shares authorized, none issued or outstanding	0	0	0
Additional paid-in capital	1,056,248	1,047,506	709,278
Retained earnings	743,127	748,186	658,396
Accumulated other comprehensive loss	(16,534)	(14,563)	(19,108)
Total stockholders' equity	1,783,521	1,781,806	1,349,168
Total Liabilities and Stockholders' Equity	$ 6,182,370	$ 3,449,557	$ 3,140,133

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2017
Statement Of Financial Position [Abstract]
Accounts receivable, allowances	$ 16,493	$ 11,829	$ 17,140
Convertible preferred stock, par value	$ 0.01
Convertible preferred stock, shares authorized	400,000	0	0
Convertible preferred stock, shares issued	400,000	0	0
Convertible preferred stock, shares outstanding	400,000	0	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	68,043,284	67,700,858	60,255,320
Common Stock (voting), outstanding	68,043,284	67,700,858	60,255,320
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		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 1,425,625	$ 870,724	$ 2,547,604	$ 1,872,908
Cost of products sold	1,087,248	666,247	1,939,474	1,417,364
Gross profit	338,377	204,477	608,130	455,544
Operating expense	395,775	207,533	616,432	411,643
Income (loss) from operations	(57,398)	(3,056)	(8,302)	43,901
Interest expense, financing costs, and other	39,570	12,268	62,138	25,842
Income (loss) before provision for income taxes	(96,968)	(15,324)	(70,440)	18,059
Provision for (benefit from) income taxes	(30,313)	(5,968)	(71,381)	6,985
Net income (loss)	(66,655)	(9,356)	941	11,074
Dividends on preferred shares, declared	6,000	0	6,000	0
Net income (loss) attributable to common shareholders	$ (72,655)	$ (9,356)	$ (5,059)	$ 11,074
Weighted-average common stock outstanding:
Basic	68,019,300	60,141,580	67,922,276	60,041,332
Diluted	68,019,300	60,141,580	67,922,276	61,069,938
Net income (loss) per share:
Basic	$ (1.07)	$ (0.16)	$ (0.07)	$ 0.18
Diluted	$ (1.07)	$ (0.16)	$ (0.07)	$ 0.18

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (66,655)	$ (9,356)	$ 941	$ 11,074
Other comprehensive income (loss):
Foreign currency translation adjustment	(2,028)	813	(1,971)	(839)
Total other comprehensive income (loss)	(2,028)	813	(1,971)	(839)
Comprehensive income (loss)	$ (68,683)	$ (8,543)	$ (1,030)	$ 10,235

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands		6 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Operating Activities
Net income (loss)		$ 941	$ 11,074
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		81,092	56,955
Stock-based compensation		7,835	7,574
Certain interest expense and other financing costs		3,987	2,703
Loss on debt extinguishment		1,725	0
Gain on sale of fixed assets		(319)	(420)
Deferred income taxes	[1]	(47,260)	2,020
Other, net		0	131
Changes in operating assets and liabilities, net of the effects of businesses acquired:
Accounts receivable		186,170	123,590
Inventories		(131,789)	(92,072)
Prepaid expenses and other assets		67,425	(53,062)
Accounts payable and accrued expenses		(130,695)	91,950
Other liabilities		854	87
Net cash provided by (used in) operating activities		39,966	150,530
Investing Activities
Purchases of property and equipment		(24,833)	(24,231)
Acquisition of businesses, net		(2,726,561)	(58,359)
Proceeds from the sale of assets		413	1,285
Net cash provided by (used in) investing activities		(2,750,981)	(81,305)
Financing Activities
Borrowings under revolving lines of credit		1,530,667	857,099
Repayments under revolving lines of credit		(1,097,463)	(948,470)
Borrowings under term loan		970,000	0
Repayments under term loan		(441,000)	(1,125)
Borrowings under senior notes		1,300,000	0
Payment of debt issuance costs		(67,723)	0
Repayments under equipment financing facilities and other		(5,643)	(5,365)
Proceeds from issuance of convertible preferred stock		400,000	0
Payment of stock issuance costs		(1,279)	0
Payment of dividends on preferred stock		(978)	0
Proceeds from issuance of common stock related to equity awards		5,317	7,840
Taxes paid related to net share settlement of equity awards		(3,933)	(697)
Net cash provided by (used in) financing activities		2,587,965	(90,718)
Effect of exchange rate changes on cash and cash equivalents		800	119
Net increase (decrease) in cash and cash equivalents		(122,250)	(21,374)
Cash and cash equivalents, beginning of period		138,250	31,386
Cash and cash equivalents, end of period		16,000	10,012
Cash paid during the period for:
Interest		28,659	29,592
Income taxes, net of tax refunds		33,037	36,151
Supplemental disclosure of non-cash financing activity
Preferred stock dividends, accrued and unpaid		$ 5,022	$ 0
[1]	Includes impact of provisional amounts recognized relating to estimated impact of Tax Cuts and Jobs Act of 2017 – see Note 12

Company Overview

Company Overview	6 Months Ended
	Mar. 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 finalized its acquisition of Allied Building Products Corp., a New Jersey corporation, and an affiliated entity (together “Allied”) for $2.625 billion, subject to certain working capital and other adjustments (see Note 3). 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. The Company operates its business under regional and local trade names and, as of March 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., Allied Building Products, LLC and Beacon Roofing Supply Canada Company.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Basis of Presentation Beacon Roofing Supply, Inc. (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 March 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 and six months ended March 31, 2018 are not necessarily indicative of the results to be expected for the twelve months ending September 30, 2018 (“fiscal year 2018” or “2018”). The three-month periods ended March 31, 2018 and 2017 each had 64 business days and the six-month periods ended March 31, 2018 and 2017 each had 125 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 2017 (“2017”) Annual Report on Form 10-K for the year ended September 30, 2017. 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 March 2016, the FASB issued ASU 2016-09, “ Compensation—Stock Compensation: Improvements to Employee Share-Based Payment Accounting.” In November 2016, the FASB issued ASU 2016-18, “ Restricted Cash.” Recent Accounting Pronouncements—Not Yet Adopted In May 2014, the FASB issued ASU 2014-09, “ Revenue from Contracts with Customers 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 2017-01, “ Business Combinations: Clarifying the Definition of a Business.” In January 2017, the FASB issued ASU 2017-04, “ Simplifying the Accounting for Goodwill Impairment.” In May 2017, the FASB issued ASU 2017-09, “Scope of Modification Accounting.” In February 2018, the FASB issued ASU 2018-02, “Income Statement – Reporting Comprehensive Income.”

Acquisitions

Acquisitions	6 Months Ended
	Mar. 31, 2018
Business Combinations [Abstract]
Acquisitions	3. Acquisitions Allied Building Products Corp. On January 2, 2017 (the “Closing Date”), the Company completed its previously announced acquisition (the “Allied Acquisition”) of all the outstanding capital stock of Allied Building Products Corp. and an affiliated entity (together, “Allied”), pursuant to that 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 March 31, 2018, the Company estimated a working capital adjustment of $120.9 million. 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 will be 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 that 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 accrues 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 on the Company’s consolidated balance sheets as mezzanine equity and recognized at $399.2 million (the $400.0 million proceeds received on the Closing Date, net of $0.8 million of issuance costs). 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 Cash $ 19,322 Accounts receivable 315,485 Inventory 322,705 Prepaid and other current assets 59,279 Property, plant, and equipment 139,528 Goodwill 1,130,635 Intangible assets 1,037,000 Current liabilities (271,252 ) Non-current liabilities (6,820 ) Total purchase price $ 2,745,882 The purchase accounting entries above assume the Company will make a Section 338(h)(10) election under the current U.S. tax code. As of March 31, 2018 the Company had not made this election, but expects to do so in in the fourth quarter of fiscal year 2018. Upon making the Section 338(h)(10) election, the Company will then determine the amount of Allied goodwill that will become tax deductible. All of the Company’s goodwill plus the 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. Net sales from the Allied Acquisition included in the Company’s statements of operations for the three and six months ended March 31, 2018 were $534.1 million. Net income (loss) from the Allied Acquisition included in the Company’s statements of operations for the three and six months ended March 31, 2018 was a loss of $13.0 million. The following table represents the unaudited pro forma consolidated net sales and net income (loss) for the Company for the periods indicated (in thousands): Six Months Ended March 31, 2018 Six Months Ended March 31, 2017 (unaudited) Net sales $ 3,213,253 $ 3,029,811 Net income (loss) (37,153 ) (33,094 ) 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 each of the periods 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 2017 During fiscal year 2017, the Company acquired 23 branches from the following five acquisitions: • On December 16, 2016, the Company purchased certain assets of BJ Supply Company, a distributor of roofing and related building products with 1 branch serving Pennsylvania and New Jersey and annual sales of approximately $4 million. The Company has finalized the acquisition accounting entries for this transaction. • On January 3, 2017, the Company acquired American Building & Roofing, Inc., a distributor of mainly residential roofing and related building products with 7 branches around Washington State and annual sales of approximately $36 million. The Company has finalized the acquisition accounting entries for this transaction. • On January 9, 2017, the Company acquired Eco Insulation Supply, a distributor of insulation and related accessories with 1 branch serving Connecticut, Southern New England and the New York City metropolitan area and annual sales of approximately $8 million. The Company has finalized the acquisition accounting entries for this transaction. • On March 1, 2017, the Company acquired Acme Building Materials, Inc., a distributor of residential roofing and related building products with 3 branches in Eastern Michigan and annual sales of approximately $13 million. The Company has finalized the acquisition accounting entries for this transaction. • On May 1, 2017, the Company purchased certain assets of Lowry’s Inc., a distributor of waterproofing and concrete restoration materials with 11 branches operating in California, Arizona, Utah and Hawaii and annual sales of approximately $76 million. The Company recorded the acquired assets and liabilities related to these transactions at their estimated fair values as of the respective acquisition dates, with resulting goodwill of $53.0 million (all of which is deductible for tax purposes) and $47.4 million in intangible assets associated with these other acquisitions. 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 Allied opening balance sheet and a related adjustment to goodwill.

Net Income (Loss) Per Share

Net Income (Loss) Per Share	6 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	4. Net Income (Loss) Per Share Basic net income (loss) per share is calculated by dividing net income (loss), less dividends on preferred shares, by the weighted-average number of common shares outstanding during the period. Diluted net income (loss) per common share is calculated by utilizing the most dilutive result from the following two methods: • Two-class method : This method assumes no conversion of the Preferred Stock. It is calculated by dividing net income (loss), less dividends on preferred shares, by the weighted-average number of common shares outstanding when including the dilutive effect common share equivalents then outstanding using the treasury stock method. • If-converted method : This method assumes full conversion of the Preferred Stock as of the first day of the period. It is calculated by dividing net income (loss) by the weighted-average number of common shares outstanding when including the dilutive effect of the Preferred Stock and the common share equivalents then outstanding using the treasury stock method. In both of the aforementioned methods, common share equivalents consist of the incremental common shares issuable upon the exercise of stock options and vesting of restricted stock unit awards. 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 March 31, Six Months Ended March 31, 2018 2017 2018 2017 Net income (loss) $ (66,655 ) $ (9,356 ) $ 941 $ 11,074 Less: Dividends on preferred shares, declared 6,000 - 6,000 - Net income (loss) attributable to common shareholders $ (72,655 ) $ (9,356 ) $ (5,059 ) $ 11,074 Weighted-average common shares outstanding, basic 68,019,300 60,141,580 67,922,276 60,041,332 Effect of common share equivalents - - - 1,028,606 Effect of Preferred Stock conversion - - - - Weighted-average common shares outstanding, diluted 68,019,300 60,141,580 67,922,276 61,069,938 Net income (loss) per share - basic $ (1.07 ) $ (0.16 ) $ (0.07 ) $ 0.18 Net income (loss) per share - diluted $ (1.07 ) $ (0.16 ) $ (0.07 ) $ 0.18 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 per share because the effect was either anti-dilutive or the requisite performance conditions were not met: Three Months Ended March 31, Six Months Ended March 31, 2018 2017 2018 2017 Stock options 275,209 270,428 281,742 416,085 Restricted stock units 90,024 - 45,012 123,780

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Stockholders' Equity	5. Stockholders’ Equity The following table presents the activity included in stockholders’ equity during the six months ended March 31, 2018 (in thousands, except share amounts): Accumulated Common Stock Additional Paid-in Retained Other Comprehensive Total Stockholders' Shares Amount Capital Earnings Loss Equity Balance at September 30, 2017 67,700,858 $ 677 $ 1,047,506 $ 748,186 $ (14,563 ) $ 1,781,806 Issuance of common stock, net of shares withheld for taxes 342,426 3 1,381 - - 1,384 Issuance costs related to secondary offering of common stock - - (474 ) - - (474 ) Stock-based compensation - - 7,835 - - 7,835 Other comprehensive income (loss) - - - - (1,971 ) (1,971 ) Net income (loss) - - - 941 - 941 Dividends on preferred shares, declared - - - (6,000 ) - (6,000 ) Balance at March 31, 2018 68,043,284 $ 680 $ 1,056,248 $ 743,127 $ (16,534 ) $ 1,783,521 Common Stock The Company is authorized to issue 100 million shares of common stock. As of March 31, 2018, September 30, 2017, and March 31, 2017 there were 68,043,284, 67,700,858 and 60,255,320 shares of common stock issued and outstanding, respectively. Accumulated Other Comprehensive Loss Other comprehensive income (loss) is comprised of certain gains and losses that are excluded from net income under GAAP and instead recorded as a separate element of stockholders’ equity. The Company’s other comprehensive income (loss) consists of foreign currency translation adjustments as well as unrealized gains or losses on the Company’s derivative contracts. The following table summarizes the components of and changes in accumulated other comprehensive loss (in thousands): Foreign Currency Translation Accumulated Other Comprehensive Loss Balance as of September 30, 2017 $ (14,563 ) $ (14,563 ) Other comprehensive income before reclassifications (1,971 ) (1,971 ) Reclassifications out of other comprehensive loss - - Balance as of March 31, 2018 $ (16,534 ) $ (16,534 )

Stock-based Compensation

Stock-based Compensation	6 Months Ended
	Mar. 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 (“SARs”) 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 March 31, 2018, there were 3,723,984 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% in the case of a performance-based restricted stock 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 become fully vested immediately (at 100% in the case of a performance-based restricted stock award). Stock Options Non-qualified stock options generally expire 10 years after the grant date and, except under certain conditions, the options are subject to continued employment and vest in three annual installments over the three-year period following the grant dates. The fair values of the options granted during the six months ended March 31, 2018 were estimated on the dates of grants using the Black-Scholes option-pricing model with the following weighted-average assumptions: Risk-free interest rate 2.10 % Expected volatility 26.43 % Expected life (in years) 5.46 Dividend yield - The following table summarizes all stock option activity for the six months ended March 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, 2017 2,084,228 $ 28.84 6.1 $ 46,714 Granted 276,370 55.17 Exercised (217,397 ) 24.46 Canceled/Forfeited (47,842 ) 41.82 Expired (1,991 ) 15.28 Balance as of March 31, 2018 2,093,368 $ 32.48 6.2 $ 43,646 Vested and expected to vest after March 31, 2018 2,071,674 $ 32.32 6.1 $ 43,510 Exercisable as of March 31, 2018 1,512,437 $ 27.48 5.2 $ 38,704 ________________________________ 1 During the three months ended March 31, 2018 and 2017, the Company recorded stock-based compensation expense related to stock options of $0.8 million and $1.3 million, respectively. During the six months ended March 31, 2018 and 2017, the Company recorded stock-based compensation expense related to stock options of $1.9 million and $2.6 million, respectively. As of March 31, 2018, there was $6.7 million of unrecognized compensation cost related to unvested stock options, which is expected to be recognized over a weighted-average period of 2.1 years. The following table summarizes additional information on stock options for the periods presented (in thousands, except per share amounts): Six Months Ended March 31, 2018 2017 Weighted-average fair value of stock options granted $ 15.86 $ 14.21 Total fair value of stock options vested 3,832 4,977 Total intrinsic value of stock options exercised 7,700 7,906 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 actual Company performance below or above 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 hold common stock and have 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 six months ended March 31, 2018: RSUs Outstanding Weighted- Average Grant Date Fair Value Balance at September 30, 2017 770,973 $ 38.95 Granted 370,190 57.40 Performance awards 1 41,440 39.56 Released (189,154 ) 31.63 Canceled/Forfeited (35,974 ) 47.65 Balance at March 31, 2018 957,475 $ 47.23 Vested and expected to vest after March 31, 2018 936,924 $ 47.10 _________________________________ 1 During the three months ended March 31, 2018 and 2017, the Company recorded stock-based compensation expense related to restricted stock units of $3.5 million and $2.5 million, respectively. During the six months ended March 31, 2018 and 2017, the Company recorded stock-based compensation expense related to restricted stock units of $5.9 million and $5.0 million, respectively. As of March 31, 2018, there was $26.2 million of unrecognized compensation cost related to unvested restricted stock units, which is expected to be recognized over a weighted-average period of 2.0 years. The following table summarizes additional information on RSUs for the periods presented (in thousands, except per share amounts): Six Months Ended March 31, 2018 2017 Weighted-average fair value of RSUs granted $ 57.40 $ 47.27 Total fair value of RSUs vested 6,523 2,736 Total intrinsic value of RSUs released 10,924 3,074

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Mar. 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 six months ended March 31, 2018 and 2017, respectively (in thousands): Balance at September 30, 2016 $ 1,197,565 Acquisitions 31,005 Translation and other adjustments (511 ) Balance at March 31, 2017 $ 1,228,059 Balance at September 30, 2017 $ 1,251,986 Acquisitions 1,130,635 Translation and other adjustments (1,001 ) Balance at March 31, 2018 $ 2,381,620 The change in the carrying amount of goodwill for the six months ended March 31, 2018 and 2017 is primarily attributable to the Company’s acquisitions finalized during the respective periods presented (see Note 3). Intangible Assets In connection with transactions finalized during the six months ended March 31, 2018 and fiscal year 2017, the Company recorded intangible assets of $1.04 billion ($910.0 million of customer relationships, $6.6 million of beneficial lease arrangements, and $120.0 million of indefinite-lived trademarks). In connection with transactions finalized during fiscal year 2017, the Company recorded intangible assets of $47.4 million ($42.7 million of customer relationships, $4.6 million of amortizable trademarks, and $0.1 million of beneficial lease arrangements). The following table summarizes intangible assets by category (in thousands, except time period amounts): March 31, 2018 September 30, 2017 March 31, 2017 Weighted- Average Remaining Life 1 (Years) Amortizable intangible assets: Non-compete agreements $ 2,824 $ 2,824 $ 2,824 2.91 Customer relationships 1,519,766 610,026 582,028 19.08 Trademarks 10,500 10,500 6,670 7.97 Beneficial lease arrangements 7,644 1,060 960 4.96 Total amortizable intangible assets 1,540,734 624,410 592,482 Less: Accumulated amortization (323,482 ) (268,391 ) (226,025 ) Total amortizable intangible assets, net $ 1,217,252 $ 356,019 $ 366,457 Indefinite lived trademarks 193,050 73,050 73,050 Total intangibles, net $ 1,410,302 $ 429,069 $ 439,507 _________________________________ 1 As of March 31, 2018 For the three months ended March 31, 2018 and 2017, we recorded $37.1 million and $20.3 million of amortization expense relating to the above-listed intangible assets, respectively. For the six months ended March 31, 2018 and 2017, we recorded $55.3 million and $40.4 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 18.9 years as of March 31, 2018. The following table summarizes the estimated future amortization expense for intangible assets (in thousands): Year Ending September 30, 2018 (Apr - Sept) $ 74,619 2019 188,832 2020 181,762 2021 152,665 2022 125,020 Thereafter 494,354 $ 1,217,252

Financing Arrangements

Financing Arrangements	6 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Financing Arrangements	8. Financing Arrangements The following table summarizes all financing arrangements from the respective periods presented (in thousands): March 31, September 30, March 31, 2018 2017 2017 Revolving Lines of Credit: 2020 ABL U.S. Revolver, expires October 1, 2020 1 $ - $ - $ 269,124 Canada Revolver, expires October 1, 2020 2 - 3,205 - 2023 ABL U.S. Revolver, expires January 2, 2023 3 424,528 - - Canada Revolver, expires January 2, 2023 - - - Less: current portion - - - Borrowings under revolving lines of credit, net $ 424,528 $ 3,205 $ 269,124 Term Loans: Term Loan, matures October 1, 2022 4 $ - $ 433,440 $ 434,912 Term Loan, matures January 2, 2025 5 931,909 - - Less: current portion (9,700 ) (4,500 ) (4,500 ) Total long-term borrowings under term loans $ 922,209 $ 428,940 $ 430,412 Senior Notes: Senior Notes, mature October 2023 6 292,967 292,328 291,689 Senior Notes, mature November 2025 7 1,278,713 - - Less: current portion - - - Total long-term borrowings under Senior Notes $ 1,571,680 $ 292,328 $ 291,689 Long-term debt, net $ 2,493,889 $ 721,268 $ 722,101 Equipment Financing Facilities and Other: Equipment financing facilities, various maturities through September 2021 8 $ 13,347 $ 12,898 $ 15,577 Capital lease obligations, various maturities through November 2021 9 14,863 19,956 22,204 Total obligations under equipment financing facilities and other 28,210 32,854 37,781 Less: current portion (9,897 ) (9,641 ) (9,514 ) Long-term obligations under equipment financing and other, net $ 18,313 $ 23,213 $ 28,267 ________________________________ 1 Extinguished on January 2, 2018 ; Effective rate on borrowings of 2.97% as of March 31, 2017 2 Extinguished on January 2, 2018; Effective rate on borrowings of 3.70% as of September 30, 2017 3 4 Extinguished on January 2, 2018; 5 6 Interest rate of 6.38% as of March 31, 2018, September 30, 2017 and March 31, 2017 7 Interest rate of 4.88% as of March 31, 2018 8 Fixed interest rates ranging from 2.33% to 3.25% as of March 31, 2018, September 30, 2017, and March 31, 2017 9 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 $67.7 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 has to 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 March 31, 2018, the total balance outstanding on the 2023 ABL, net of $11.8 million of unamortized debt issuance costs, was $424.5 million. The Company also has outstanding standby letters of credit related to the 2023 U.S. Revolver in the amount of $14.8 million as of March 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 Revolving Priority Collateral. The Term Loan is guaranteed jointly, severally, fully and unconditionally by the Company’s active United States subsidiaries. As of March 31, 2018, the outstanding balance on the Term Loan, net of $38.1 million of unamortized debt issuance costs, was $931.9 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 March 31, 2018, the outstanding balance on the 2025 Senior Notes, net of $21.3 million of unamortized debt issuance costs, was $1.28 billion. Financing - RSG Acquisition In connection with the RSG Acquisition, 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 2, 2010 and consisted of revolving loans in both the United States (“2020 U.S. Revolver”) in the amount of $670.0 million and Canada (“Canada Revolver”) 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 March 31, 2018, the outstanding balance on the 2023 Senior Notes, net of $7.0 million of unamortized debt issuance costs, was $293.0 million. Equipment Financing Facilities and Other As of March 31, 2018, the Company had a $13.3 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 March 31, 2018, the Company had $14.9 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	6 Months Ended
	Mar. 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 March 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, 2018 (April - Sept) $ 39,484 2019 99,398 2020 86,089 2021 75,097 2022 55,207 Thereafter 135,396 Total minimum lease payments $ 490,671 For the three months ended March 31, 2018 and 2017, rent expense was $28.5 million and $14.7 million, respectively. For the six months ended March 31, 2018 and 2017, rent expense was $43.7 million and $28.9 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	6 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Geographic Data	10. Geographic Data The following tables summarize certain geographic information for the periods presented (in thousands): Three Months Ended March 31, Six Months Ended March 31, 2018 2017 2018 2017 Net sales U.S. $ 1,404,617 $ 849,226 $ 2,480,879 $ 1,809,461 Canada 21,008 21,498 66,725 63,447 Total net sales $ 1,425,625 $ 870,724 $ 2,547,604 $ 1,872,908 March 31, September 30, March 31, 2018 2017 2017 Long-lived assets U.S. $ 1,499,860 $ 507,236 $ 511,507 Canada 13,125 13,446 12,841 Total long-lived assets $ 1,512,985 $ 520,682 $ 524,348

Fair Value Measurement

Fair Value Measurement	6 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurement	11. Fair Value Measurement As of March 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 March 31, 2018, based upon recent trading prices (Level 2 — market approach), the fair value of the Company’s $300.0 million Senior Notes due in 2023 was $317.0 million and the fair value of the $1.30 billion Senior Notes due 2025 was $1.24 billion. As of March 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).

Income Taxes

Income Taxes	6 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes On December 22, 2017, the U.S. federal government officially signed into law the Tax Cut and Jobs Act of 2017 (“TCJA”). ASC 740, Accounting for Income Taxes, requires companies to recognize the effect of tax law changes in the period of enactment even though the effective date for most provisions is for tax years beginning after December 31, 2017, or in the case of certain other provisions, January 1, 2018. Though certain key aspects of the new law are effective January 1, 2018 and have an immediate accounting effect, other significant provisions are not effective or may not result in accounting effects for September 30 fiscal year-end companies until October 1, 2018. Given the significance of the legislation, the SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”), which allows registrants to record provisional amounts during a one year “measurement period” similar to that used when accounting for business combinations. Per SAB 118, the measurement period is deemed to have an earlier end date when the registrant has obtained, prepared and analyzed the information necessary to finalize its accounting. During the measurement period, impacts of the updated tax law are expected to be recorded at the time a reasonable estimate for all, or a portion, of the effects can be made, and provisional amounts can be recognized and adjusted as information becomes available, prepared or analyzed. SAB 118 states, that at each reporting period, companies must disclose the effects of the TCJA for areas where accounting is complete, disclose provisional amounts (or adjustments to provisional amounts) for the effects of the TCJA areas where accounting is not complete but a reasonable estimate has been determined, and confirm areas where a reasonable estimate of the effects cannot yet be made, and therefore taxes are reflected in accordance with law prior to the enactment of the TCJA. As of March 31, 2018, the Company was still assessing the overall impact that the TCJA will have on its financial statements and related disclosures; however, the Company was able to make the following reasonable estimates on the impact of the corporate taxation changes from the TCJA: • The Company has a blended federal corporate income tax rate for fiscal year 2018 of 24.5%. This transitional tax rate stems from Section 15 of the Internal Revenue Code that states if the tax rate changes in during a tax year, the tax rate for the full year is calculated using the prior and revised tax rates on a proportional basis using the number of days under each legislated rate. For 2019, the Company will have a federal corporate income tax rate of 21%. • The Company initially remeasured all its deferred tax assets and liabilities based on the revised corporate income tax rate (21%). Due to the Company’s status as a non-calendar year-end filer, it was required to perform additional analysis to distinguish those deferred taxes that will be realized during fiscal year 2018 at the blended federal corporate income tax rate of 24.5% from those that will be realized in future years at the revised rate. As a result, the Company recognized a provisional decrease of its deferred tax liabilities and related income tax benefit of $1.5 million and $48.9 million in its consolidated statement of operations for the three and six months ended March 31, 2018, respectively. The Company will continue to refine its deferred tax remeasurement calculation and assess the related impact, which potentially could result in additional adjustments. • The Company estimated the impact of the mandatory repatriation transition tax on the net accumulated earnings and profits of the Company’s foreign subsidiary, Beacon Roofing Supply Canada Company (“BRSCC”). As a result, the Company recognized a provisional expense of $0.9 million for the one-time transition tax liability in its consolidated statement of operations for the three and six months ended March 31, 2018. The Company has not yet finalized its calculation of the repatriation transition tax, as it continues to analyze of the amount of BRSCC earnings held in cash and other specified assets that had been previously deferred from U.S. federal taxation. State conformity to the TCJA law changes has not been communicated by the state and local jurisdictions at this time; therefore, the Company has not made any provisional adjustments related to the potential impact in its financial statements. The Company will continue to account for items where a reasonable estimate of the impact could not be assessed as of March 31, 2018 under the guidance that was in effect immediately prior to the enactment of the TCJA, ASC 740, Accounting for Income Taxes.

Supplemental Guarantor Informat

Supplemental Guarantor Information	6 Months Ended
	Mar. 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 of 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) March 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Assets Current assets: Cash and cash equivalents $ - $ 18,746 $ 8,196 $ (10,942 ) $ 16,000 Accounts receivable, net - 816,058 17,905 (1,140 ) 832,823 Inventories, net - 978,852 26,725 - 1,005,577 Prepaid expenses and other current assets 35,646 199,947 4,722 - 240,315 Total current assets 35,646 2,013,603 57,548 (12,082 ) 2,094,715 Intercompany receivable, net - 1,284,455 - (1,284,455 ) - Investments in consolidated subsidiaries 5,949,437 - - (5,949,437 ) - Deferred income taxes, net 19,902 - - (19,902 ) - Property and equipment, net 10,761 272,866 10,595 - 294,222 Goodwill - 2,351,447 30,173 - 2,381,620 Intangibles, net - 1,407,772 2,530 - 1,410,302 Other assets, net 1,243 268 - - 1,511 Total Assets $ 6,016,989 $ 7,330,411 $ 100,846 $ (7,265,876 ) $ 6,182,370 Liabilities and Stockholders' Equity Current liabilities: Accounts payable $ 21,042 $ 572,222 $ 12,377 $ (12,082 ) $ 593,559 Accrued expenses 61,788 281,265 4,997 - 348,050 Current portions of long-term debt 9,700 9,897 - - 19,597 Total current liabilities 92,530 863,384 17,374 (12,082 ) 961,206 Intercompany payable, net 1,247,040 - 37,415 (1,284,455 ) - Borrowings under revolving lines of credit, net - 424,528 - - 424,528 Long-term debt, net 2,493,889 - - - 2,493,889 Deferred income taxes, net - 110,614 389 (19,902 ) 91,101 Long-term obligations under equipment financing and other, net - 18,313 - - 18,313 Other long-term liabilities 814 9,729 74 - 10,617 Total liabilities 3,834,273 1,426,568 55,252 (1,316,439 ) 3,999,654 Convertible preferred stock 399,195 - - - 399,195 Total stockholders' equity 1,783,521 5,903,843 45,594 (5,949,437 ) 1,783,521 Total Liabilities and Stockholders' Equity $ 6,016,989 $ 7,330,411 $ 100,846 $ (7,265,876 ) $ 6,182,370 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Balance Sheets (Unaudited; In thousands) September 30, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Assets Current assets: Cash and cash equivalents $ - $ 149,799 $ 1,582 $ (13,131 ) $ 138,250 Accounts receivable, net - 663,034 42,633 (1,140 ) 704,527 Inventories, net - 527,226 24,698 - 551,924 Prepaid expenses and other current assets 4,195 198,817 6,126 - 209,138 Total current assets 4,195 1,538,876 75,039 (14,271 ) 1,603,839 Intercompany receivable, net - 655,372 - (655,372 ) - Investments in consolidated subsidiaries 3,160,273 - - (3,160,273 ) - Deferred income taxes, net 30,822 - - (30,822 ) - Property and equipment, net 6,610 138,955 10,564 - 156,129 Goodwill - 1,220,812 31,174 - 1,251,986 Intangibles, net - 426,187 2,882 - 429,069 Other assets, net 2,912 5,622 - - 8,534 Total Assets $ 3,204,812 $ 3,985,824 $ 119,659 $ (3,860,738 ) $ 3,449,557 Liabilities and Stockholders' Equity Current liabilities: Accounts payable $ 27,174 $ 468,891 $ 21,903 $ (14,271 ) $ 503,697 Accrued expenses 51,183 204,173 5,941 - 261,297 Current portions of long-term obligations 4,500 9,641 - - 14,141 Total current liabilities 82,857 682,705 27,844 (14,271 ) 779,135 Intercompany payable, net 618,881 - 36,491 (655,372 ) - Borrowings under revolving lines of credit, net - - 3,205 - 3,205 Long-term debt, net 721,268 - - - 721,268 Deferred income taxes, net - 168,209 996 (30,822 ) 138,383 Long-term obligations under equipment financing and other, net - 23,147 66 - 23,213 Other long-term liabilities 2,547 - - 2,547 Total liabilities 1,423,006 876,608 68,602 (700,465 ) 1,667,751 Total stockholders' equity 1,781,806 3,109,216 51,057 (3,160,273 ) 1,781,806 Total Liabilities and Stockholders' Equity $ 3,204,812 $ 3,985,824 $ 119,659 $ (3,860,738 ) $ 3,449,557 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Balance Sheets (Unaudited; In thousands) March 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Assets Current assets: Cash and cash equivalents $ - $ 24,181 $ 1,946 $ (16,115 ) $ 10,012 Accounts receivable, net - 490,724 15,437 225 506,386 Inventories, net - 556,463 24,426 - 580,889 Prepaid expenses and other current assets 28,952 184,764 3,673 - 217,389 Total current assets 28,952 1,256,132 45,482 (15,890 ) 1,314,676 Intercompany receivable, net - 961,450 - (961,450 ) - Investments in consolidated subsidiaries 2,959,542 - - (2,959,542 ) - Deferred income taxes, net 57,419 - - (57,419 ) - Property and equipment, net 5,614 140,918 9,848 - 156,380 Goodwill - 1,198,805 29,254 - 1,228,059 Intangibles, net - 436,513 2,994 - 439,507 Other assets, net 1,242 269 - - 1,511 Total Assets $ 3,052,769 $ 3,994,087 $ 87,578 $ (3,994,301 ) $ 3,140,133 Liabilities and Stockholders' Equity Current liabilities: Accounts payable $ 27,209 $ 468,144 $ 6,865 $ (15,890 ) $ 486,328 Accrued expenses 26,226 103,045 1,993 - 131,264 Current portions of long-term obligations 4,500 9,514 - - 14,014 Total current liabilities 57,935 580,703 8,858 (15,890 ) 631,606 Intercompany payable, net 923,565 - 37,885 (961,450 ) - Borrowings under revolving lines of credit - 269,124 - - 269,124 Long-term debt, net 722,101 - - - 722,101 Deferred income taxes, net - 194,556 358 (57,419 ) 137,495 Long-term obligations under equipment financing and other, net - 28,221 46 - 28,267 Other long-term liabilities - 2,372 - - 2,372 Total liabilities 1,703,601 1,074,976 47,147 (1,034,759 ) 1,790,965 Total stockholders' equity 1,349,168 2,919,111 40,431 (2,959,542 ) 1,349,168 Total Liabilities and Stockholders' Equity $ 3,052,769 $ 3,994,087 $ 87,578 $ (3,994,301 ) $ 3,140,133 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Operations (Unaudited; In thousands) Three Months Ended March 31, 2018 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations and Other Consolidated Net sales $ - $ 1,404,617 $ 21,008 $ - $ 1,425,625 Cost of products sold - 1,070,605 16,643 - 1,087,248 Gross profit - 334,012 4,365 - 338,377 Operating expense 3,115 384,245 8,415 - 395,775 Intercompany charges (income) (1,477 ) 1,477 - - - Income (loss) from operations (1,638 ) (51,710 ) (4,050 ) - (57,398 ) Interest expense, financing costs, and other 47,220 3,807 (11,457 ) - 39,570 Intercompany interest expense (income) (5,181 ) 4,804 377 - - Income (loss) before provision for income taxes (43,677 ) (60,321 ) 7,030 - (96,968 ) Provision for (benefit from) income taxes (10,469 ) (18,575 ) (1,269 ) - (30,313 ) Income (loss) before equity in net income of subsidiaries (33,208 ) (41,746 ) 8,299 - (66,655 ) Equity in net income of subsidiaries (33,447 ) - - 33,447 - Net income (loss) $ (66,655 ) $ (41,746 ) $ 8,299 $ 33,447 $ (66,655 ) Three Months Ended March 31, 2017 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations and Other Consolidated Net sales $ - $ 849,226 $ 21,498 $ - $ 870,724 Cost of products sold - 649,595 16,652 - 666,247 Gross profit - 199,631 4,846 - 204,477 Operating expense 7,010 193,448 7,075 - 207,533 Intercompany charges (income) (12,555 ) 11,993 562 - - Income (loss) from operations 5,545 (5,810 ) (2,791 ) - (3,056 ) Interest expense, financing costs, and other 3,983 8,003 282 - 12,268 Intercompany interest expense (income) (5,089 ) 5,089 - - - Income (loss) before provision for income taxes 6,651 (18,902 ) (3,073 ) - (15,324 ) Provision for (benefit from) income taxes 2,444 (7,568 ) (844 ) - (5,968 ) Income (loss) before equity in net income of subsidiaries 4,207 (11,334 ) (2,229 ) - (9,356 ) Equity in net income of subsidiaries (13,563 ) - - 13,563 - Net income (loss) $ (9,356 ) $ (11,334 ) $ (2,229 ) $ 13,563 $ (9,356 ) BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Operations (Unaudited; In thousands) Six Months Ended March 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net sales $ - $ 2,480,879 $ 66,725 $ - $ 2,547,604 Cost of products sold - 1,887,041 52,433 - 1,939,474 Gross profit - 593,838 14,292 - 608,130 Operating expense 3,438 595,000 17,994 - 616,432 Intercompany charges (income) (584 ) 584 - - - Income (loss) from operations (2,854 ) (1,746 ) (3,702 ) - (8,302 ) Interest expense, financing costs, and other 57,296 4,632 210 - 62,138 Intercompany interest expense (income) (10,889 ) 10,125 764 - - Income (loss) before provision for income taxes (49,261 ) (16,503 ) (4,676 ) - (70,440 ) Provision for (benefit from) income taxes (4,948 ) (65,247 ) (1,186 ) - (71,381 ) Income (loss) before equity in net income of subsidiaries (44,313 ) 48,744 (3,490 ) - 941 Equity in net income of subsidiaries 45,254 - - (45,254 ) - Net income (loss) $ 941 $ 48,744 $ (3,490 ) $ (45,254 ) $ 941 Six Months Ended March 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net sales $ - $ 1,809,461 $ 63,447 $ - $ 1,872,908 Cost of products sold - 1,368,129 49,235 - 1,417,364 Gross profit - 441,332 14,212 - 455,544 Operating expense 15,656 380,521 15,466 - 411,643 Intercompany charges (income) (24,508 ) 23,392 1,116 - - Income (loss) from operations 8,852 37,419 (2,370 ) - 43,901 Interest expense, financing costs, and other 19,337 5,458 1,047 - 25,842 Intercompany interest expense (income) (10,682 ) 10,682 - - - Income (loss) before provision for income taxes 197 21,279 (3,417 ) - 18,059 Provision for (benefit from) income taxes (410 ) 8,334 (939 ) - 6,985 Income (loss) before equity in net income of subsidiaries 607 12,945 (2,478 ) - 11,074 Equity in net income of subsidiaries 10,467 - - (10,467 ) - Net income (loss) $ 11,074 $ 12,945 $ (2,478 ) $ (10,467 ) $ 11,074 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Comprehensive Income (Unaudited; In thousands) Three Months Ended March 31, 2018 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations and Other Consolidated Net income (loss) $ (66,655 ) $ (41,746 ) $ 8,299 $ 33,447 $ (66,655 ) Other comprehensive income (loss): Foreign currency translation adjustment (2,028 ) - (2,028 ) 2,028 (2,028 ) Total other comprehensive income (loss) (2,028 ) - (2,028 ) 2,028 (2,028 ) Comprehensive income (loss) $ (68,683 ) $ (41,746 ) $ 6,271 $ 35,475 $ (68,683 ) Three Months Ended March 31, 2017 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations and Other Consolidated Net income (loss) $ (9,356 ) $ (11,334 ) $ (2,229 ) $ 13,563 $ (9,356 ) Other comprehensive income (loss): Foreign currency translation adjustment 813 - 813 (813 ) 813 Total other comprehensive income (loss) 813 - 813 (813 ) 813 Comprehensive income (loss) $ (8,543 ) $ (11,334 ) $ (1,416 ) $ 12,750 $ (8,543 ) Six Months Ended March 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net income (loss) $ 941 $ 48,744 $ (3,490 ) $ (45,254 ) $ 941 Other comprehensive income (loss): Foreign currency translation adjustment (1,971 ) - (1,971 ) 1,971 (1,971 ) Total other comprehensive income (loss) (1,971 ) - (1,971 ) 1,971 (1,971 ) Comprehensive income (loss) $ (1,030 ) $ 48,744 $ (5,461 ) $ (43,283 ) $ (1,030 ) Six Months Ended March 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net income (loss) $ 11,074 $ 12,945 $ (2,478 ) $ (10,467 ) $ 11,074 Other comprehensive income (loss): Foreign currency translation adjustment (839 ) - (839 ) 839 (839 ) Total other comprehensive income (loss) (839 ) - (839 ) 839 (839 ) Comprehensive income (loss) $ 10,235 $ 12,945 $ (3,317 ) $ (9,628 ) $ 10,235 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Cash Flows (Unaudited; In thousands) Six Months Ended March 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net cash provided by (used in) operating activities $ (47,488 ) $ 77,948 $ 9,289 $ 217 $ 39,966 Investing Activities Purchases of property and equipment (5,050 ) (18,524 ) (1,259 ) - (24,833 ) Acquisition of businesses, net (2,726,561 ) - - - (2,726,561 ) Proceeds from the sale of assets - 398 15 - 413 Intercompany activity 606,865 - - (606,865 ) - Net cash provided by (used in) investing activities (2,124,746 ) (18,126 ) (1,244 ) (606,865 ) (2,750,981 ) Financing Activities Borrowings under revolving lines of credit - 1,514,102 16,565 - 1,530,667 Repayments under revolving lines of credit - (1,077,744 ) (19,719 ) - (1,097,463 ) Borrowings under term loan 970,000 - - - 970,000 Repayments under term loan (441,000 ) - - - (441,000 ) Repayments under equipment financing facilities and other - (5,643 ) - - (5,643 ) Borrowings under senior notes 1,300,000 - - - 1,300,000 Payment of debt issuance costs (55,893 ) (11,830 ) - - (67,723 ) Proceeds from issuance of convertible preferred stock 400,000 - - - 400,000 Payment of stock issuance costs (1,279 ) - - - (1,279 ) Payment of dividends on preferred stock (978 ) - - - (978 ) Proceeds from issuance of common stock related to equity awards 5,317 - - - 5,317 Taxes paid related to net share settlement of equity awards (3,933 ) - - - (3,933 ) Intercompany activity - (609,760 ) 923 608,837 - Net cash provided by (used in) financing activities 2,172,234 (190,875 ) (2,231 ) 608,837 2,587,965 Effect of exchange rate changes on cash and cash equivalents - - 800 - 800 Net increase (decrease) in cash and cash equivalents - (131,053 ) 6,614 2,189 (122,250 ) Cash and cash equivalents, beginning of period - 149,799 1,582 (13,131 ) 138,250 Cash and cash equivalents, end of period $ - $ 18,746 $ 8,196 $ (10,942 ) $ 16,000 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Cash Flows (Unaudited; In thousands) Six Months Ended March 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net cash provided by (used in) operating activities $ (29,347 ) $ 181,934 $ 5,121 $ (7,178 ) $ 150,530 Investing Activities Purchases of property and equipment (1,709 ) (21,742 ) (780 ) - (24,231 ) Acquisition of businesses (58,359 ) - - - (58,359 ) Proceeds from the sale of assets - 1,274 11 - 1,285 Intercompany activity 83,397 - - (83,397 ) - Net cash provided by (used in) investing activities 23,329 (20,468 ) (769 ) (83,397 ) (81,305 ) Financing Activities Borrowings under revolving lines of credit - 852,583 4,516 - 857,099 Repayments under revolving lines of credit - (939,438 ) (9,032 ) - (948,470 ) Repayments under term loan (1,125 ) - - - (1,125 ) Repayments under equipment financing facilities and other - (5,365 ) - - (5,365 ) Proceeds from issuance of common stock 7,840 - - - 7,840 Taxes paid related to net share settlement of equity awards (697 ) - - - (697 ) Intercompany activity - (82,512 ) (885 ) 83,397 - Net cash provided by (used in) financing activities 6,018 (174,732 ) (5,401 ) 83,397 (90,718 ) Effect of exchange rate changes on cash and cash equivalents - - 119 - 119 Net increase (decrease) in cash and cash equivalents - (13,266 ) (930 ) (7,178 ) (21,374 ) Cash and cash equivalents, beginning of period - 37,447 2,876 (8,937 ) 31,386 Cash and cash equivalents, end of period $ - $ 24,181 $ 1,946 $ (16,115 ) $ 10,012

Summary of Significant Accoun20

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Beacon Roofing Supply, Inc. (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 March 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 and six months ended March 31, 2018 are not necessarily indicative of the results to be expected for the twelve months ending September 30, 2018 (“fiscal year 2018” or “2018”). The three-month periods ended March 31, 2018 and 2017 each had 64 business days and the six-month periods ended March 31, 2018 and 2017 each had 125 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 2017 (“2017”) Annual Report on Form 10-K for the year ended September 30, 2017.
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 March 2016, the FASB issued ASU 2016-09, “ Compensation—Stock Compensation: Improvements to Employee Share-Based Payment Accounting.” In November 2016, the FASB issued ASU 2016-18, “ Restricted Cash.” Recent Accounting Pronouncements—Not Yet Adopted In May 2014, the FASB issued ASU 2014-09, “ Revenue from Contracts with Customers 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 2017-01, “ Business Combinations: Clarifying the Definition of a Business.” In January 2017, the FASB issued ASU 2017-04, “ Simplifying the Accounting for Goodwill Impairment.” In May 2017, the FASB issued ASU 2017-09, “Scope of Modification Accounting.” In February 2018, the FASB issued ASU 2018-02, “Income Statement – Reporting Comprehensive Income.”

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Mar. 31, 2018
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The Company has recorded purchase accounting entries on a preliminary basis for the Allied Acquisition, detailed as follows (in thousands): Cash $ 19,322 Accounts receivable 315,485 Inventory 322,705 Prepaid and other current assets 59,279 Property, plant, and equipment 139,528 Goodwill 1,130,635 Intangible assets 1,037,000 Current liabilities (271,252 ) Non-current liabilities (6,820 ) Total purchase price $ 2,745,882
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): Six Months Ended March 31, 2018 Six Months Ended March 31, 2017 (unaudited) Net sales $ 3,213,253 $ 3,029,811 Net income (loss) (37,153 ) (33,094 )

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	6 Months Ended
	Mar. 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 March 31, Six Months Ended March 31, 2018 2017 2018 2017 Net income (loss) $ (66,655 ) $ (9,356 ) $ 941 $ 11,074 Less: Dividends on preferred shares, declared 6,000 - 6,000 - Net income (loss) attributable to common shareholders $ (72,655 ) $ (9,356 ) $ (5,059 ) $ 11,074 Weighted-average common shares outstanding, basic 68,019,300 60,141,580 67,922,276 60,041,332 Effect of common share equivalents - - - 1,028,606 Effect of Preferred Stock conversion - - - - Weighted-average common shares outstanding, diluted 68,019,300 60,141,580 67,922,276 61,069,938 Net income (loss) per share - basic $ (1.07 ) $ (0.16 ) $ (0.07 ) $ 0.18 Net income (loss) per share - diluted $ (1.07 ) $ (0.16 ) $ (0.07 ) $ 0.18
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 per share because the effect was either anti-dilutive or the requisite performance conditions were not met: Three Months Ended March 31, Six Months Ended March 31, 2018 2017 2018 2017 Stock options 275,209 270,428 281,742 416,085 Restricted stock units 90,024 - 45,012 123,780

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Schedule of Stockholders Equity	The following table presents the activity included in stockholders’ equity during the six months ended March 31, 2018 (in thousands, except share amounts): Accumulated Common Stock Additional Paid-in Retained Other Comprehensive Total Stockholders' Shares Amount Capital Earnings Loss Equity Balance at September 30, 2017 67,700,858 $ 677 $ 1,047,506 $ 748,186 $ (14,563 ) $ 1,781,806 Issuance of common stock, net of shares withheld for taxes 342,426 3 1,381 - - 1,384 Issuance costs related to secondary offering of common stock - - (474 ) - - (474 ) Stock-based compensation - - 7,835 - - 7,835 Other comprehensive income (loss) - - - - (1,971 ) (1,971 ) Net income (loss) - - - 941 - 941 Dividends on preferred shares, declared - - - (6,000 ) - (6,000 ) Balance at March 31, 2018 68,043,284 $ 680 $ 1,056,248 $ 743,127 $ (16,534 ) $ 1,783,521
Reclassification out of Accumulated Other Comprehensive Income	The following table summarizes the components of and changes in accumulated other comprehensive loss (in thousands): Foreign Currency Translation Accumulated Other Comprehensive Loss Balance as of September 30, 2017 $ (14,563 ) $ (14,563 ) Other comprehensive income before reclassifications (1,971 ) (1,971 ) Reclassifications out of other comprehensive loss - - Balance as of March 31, 2018 $ (16,534 ) $ (16,534 )

Stock-based Compensation (Table

Stock-based Compensation (Tables)	6 Months Ended
	Mar. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Fair Values of Options, Black-Scholes Option-Pricing Model, Weighted-Average Assumptions	The fair values of the options granted during the six months ended March 31, 2018 were estimated on the dates of grants using the Black-Scholes option-pricing model with the following weighted-average assumptions: Risk-free interest rate 2.10 % Expected volatility 26.43 % Expected life (in years) 5.46 Dividend yield -
Stock Options Outstanding and Activity During the Period	The following table summarizes all stock option activity for the six months ended March 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, 2017 2,084,228 $ 28.84 6.1 $ 46,714 Granted 276,370 55.17 Exercised (217,397 ) 24.46 Canceled/Forfeited (47,842 ) 41.82 Expired (1,991 ) 15.28 Balance as of March 31, 2018 2,093,368 $ 32.48 6.2 $ 43,646 Vested and expected to vest after March 31, 2018 2,071,674 $ 32.32 6.1 $ 43,510 Exercisable as of March 31, 2018 1,512,437 $ 27.48 5.2 $ 38,704 ________________________________ 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): Six Months Ended March 31, 2018 2017 Weighted-average fair value of stock options granted $ 15.86 $ 14.21 Total fair value of stock options vested 3,832 4,977 Total intrinsic value of stock options exercised 7,700 7,906
Restricted Shares and Units Outstanding and Activity During the Period	The following table summarizes all restricted stock unit activity for the six months ended March 31, 2018: RSUs Outstanding Weighted- Average Grant Date Fair Value Balance at September 30, 2017 770,973 $ 38.95 Granted 370,190 57.40 Performance awards 1 41,440 39.56 Released (189,154 ) 31.63 Canceled/Forfeited (35,974 ) 47.65 Balance at March 31, 2018 957,475 $ 47.23 Vested and expected to vest after March 31, 2018 936,924 $ 47.10 _________________________________ 1
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): Six Months Ended March 31, 2018 2017 Weighted-average fair value of RSUs granted $ 57.40 $ 47.27 Total fair value of RSUs vested 6,523 2,736 Total intrinsic value of RSUs released 10,924 3,074

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Mar. 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 six months ended March 31, 2018 and 2017, respectively (in thousands): Balance at September 30, 2016 $ 1,197,565 Acquisitions 31,005 Translation and other adjustments (511 ) Balance at March 31, 2017 $ 1,228,059 Balance at September 30, 2017 $ 1,251,986 Acquisitions 1,130,635 Translation and other adjustments (1,001 ) Balance at March 31, 2018 $ 2,381,620
Summary of Intangible Assets	The following table summarizes intangible assets by category (in thousands, except time period amounts): March 31, 2018 September 30, 2017 March 31, 2017 Weighted- Average Remaining Life 1 (Years) Amortizable intangible assets: Non-compete agreements $ 2,824 $ 2,824 $ 2,824 2.91 Customer relationships 1,519,766 610,026 582,028 19.08 Trademarks 10,500 10,500 6,670 7.97 Beneficial lease arrangements 7,644 1,060 960 4.96 Total amortizable intangible assets 1,540,734 624,410 592,482 Less: Accumulated amortization (323,482 ) (268,391 ) (226,025 ) Total amortizable intangible assets, net $ 1,217,252 $ 356,019 $ 366,457 Indefinite lived trademarks 193,050 73,050 73,050 Total intangibles, net $ 1,410,302 $ 429,069 $ 439,507 _________________________________ 1 As of March 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, 2018 (Apr - Sept) $ 74,619 2019 188,832 2020 181,762 2021 152,665 2022 125,020 Thereafter 494,354 $ 1,217,252

Financing Arrangements (Tables)

Financing Arrangements (Tables)	6 Months Ended
	Mar. 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): March 31, September 30, March 31, 2018 2017 2017 Revolving Lines of Credit: 2020 ABL U.S. Revolver, expires October 1, 2020 1 $ - $ - $ 269,124 Canada Revolver, expires October 1, 2020 2 - 3,205 - 2023 ABL U.S. Revolver, expires January 2, 2023 3 424,528 - - Canada Revolver, expires January 2, 2023 - - - Less: current portion - - - Borrowings under revolving lines of credit, net $ 424,528 $ 3,205 $ 269,124 Term Loans: Term Loan, matures October 1, 2022 4 $ - $ 433,440 $ 434,912 Term Loan, matures January 2, 2025 5 931,909 - - Less: current portion (9,700 ) (4,500 ) (4,500 ) Total long-term borrowings under term loans $ 922,209 $ 428,940 $ 430,412 Senior Notes: Senior Notes, mature October 2023 6 292,967 292,328 291,689 Senior Notes, mature November 2025 7 1,278,713 - - Less: current portion - - - Total long-term borrowings under Senior Notes $ 1,571,680 $ 292,328 $ 291,689 Long-term debt, net $ 2,493,889 $ 721,268 $ 722,101 Equipment Financing Facilities and Other: Equipment financing facilities, various maturities through September 2021 8 $ 13,347 $ 12,898 $ 15,577 Capital lease obligations, various maturities through November 2021 9 14,863 19,956 22,204 Total obligations under equipment financing facilities and other 28,210 32,854 37,781 Less: current portion (9,897 ) (9,641 ) (9,514 ) Long-term obligations under equipment financing and other, net $ 18,313 $ 23,213 $ 28,267 ________________________________ 1 Extinguished on January 2, 2018 ; Effective rate on borrowings of 2.97% as of March 31, 2017 2 Extinguished on January 2, 2018; Effective rate on borrowings of 3.70% as of September 30, 2017 3 4 Extinguished on January 2, 2018; 5 6 Interest rate of 6.38% as of March 31, 2018, September 30, 2017 and March 31, 2017 7 Interest rate of 4.88% as of March 31, 2018 8 Fixed interest rates ranging from 2.33% to 3.25% as of March 31, 2018, September 30, 2017, and March 31, 2017 9

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Schedule of Minimum Rental Commitments under Non-cancelable Operating Leases	At March 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, 2018 (April - Sept) $ 39,484 2019 99,398 2020 86,089 2021 75,097 2022 55,207 Thereafter 135,396 Total minimum lease payments $ 490,671

Geographic Data (Tables)

Geographic Data (Tables)	6 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Schedule of Geographic Information	The following tables summarize certain geographic information for the periods presented (in thousands): Three Months Ended March 31, Six Months Ended March 31, 2018 2017 2018 2017 Net sales U.S. $ 1,404,617 $ 849,226 $ 2,480,879 $ 1,809,461 Canada 21,008 21,498 66,725 63,447 Total net sales $ 1,425,625 $ 870,724 $ 2,547,604 $ 1,872,908 March 31, September 30, March 31, 2018 2017 2017 Long-lived assets U.S. $ 1,499,860 $ 507,236 $ 511,507 Canada 13,125 13,446 12,841 Total long-lived assets $ 1,512,985 $ 520,682 $ 524,348

Supplemental Guarantor Inform29

Supplemental Guarantor Information (Tables)	6 Months Ended
	Mar. 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) March 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Assets Current assets: Cash and cash equivalents $ - $ 18,746 $ 8,196 $ (10,942 ) $ 16,000 Accounts receivable, net - 816,058 17,905 (1,140 ) 832,823 Inventories, net - 978,852 26,725 - 1,005,577 Prepaid expenses and other current assets 35,646 199,947 4,722 - 240,315 Total current assets 35,646 2,013,603 57,548 (12,082 ) 2,094,715 Intercompany receivable, net - 1,284,455 - (1,284,455 ) - Investments in consolidated subsidiaries 5,949,437 - - (5,949,437 ) - Deferred income taxes, net 19,902 - - (19,902 ) - Property and equipment, net 10,761 272,866 10,595 - 294,222 Goodwill - 2,351,447 30,173 - 2,381,620 Intangibles, net - 1,407,772 2,530 - 1,410,302 Other assets, net 1,243 268 - - 1,511 Total Assets $ 6,016,989 $ 7,330,411 $ 100,846 $ (7,265,876 ) $ 6,182,370 Liabilities and Stockholders' Equity Current liabilities: Accounts payable $ 21,042 $ 572,222 $ 12,377 $ (12,082 ) $ 593,559 Accrued expenses 61,788 281,265 4,997 - 348,050 Current portions of long-term debt 9,700 9,897 - - 19,597 Total current liabilities 92,530 863,384 17,374 (12,082 ) 961,206 Intercompany payable, net 1,247,040 - 37,415 (1,284,455 ) - Borrowings under revolving lines of credit, net - 424,528 - - 424,528 Long-term debt, net 2,493,889 - - - 2,493,889 Deferred income taxes, net - 110,614 389 (19,902 ) 91,101 Long-term obligations under equipment financing and other, net - 18,313 - - 18,313 Other long-term liabilities 814 9,729 74 - 10,617 Total liabilities 3,834,273 1,426,568 55,252 (1,316,439 ) 3,999,654 Convertible preferred stock 399,195 - - - 399,195 Total stockholders' equity 1,783,521 5,903,843 45,594 (5,949,437 ) 1,783,521 Total Liabilities and Stockholders' Equity $ 6,016,989 $ 7,330,411 $ 100,846 $ (7,265,876 ) $ 6,182,370 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Balance Sheets (Unaudited; In thousands) September 30, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Assets Current assets: Cash and cash equivalents $ - $ 149,799 $ 1,582 $ (13,131 ) $ 138,250 Accounts receivable, net - 663,034 42,633 (1,140 ) 704,527 Inventories, net - 527,226 24,698 - 551,924 Prepaid expenses and other current assets 4,195 198,817 6,126 - 209,138 Total current assets 4,195 1,538,876 75,039 (14,271 ) 1,603,839 Intercompany receivable, net - 655,372 - (655,372 ) - Investments in consolidated subsidiaries 3,160,273 - - (3,160,273 ) - Deferred income taxes, net 30,822 - - (30,822 ) - Property and equipment, net 6,610 138,955 10,564 - 156,129 Goodwill - 1,220,812 31,174 - 1,251,986 Intangibles, net - 426,187 2,882 - 429,069 Other assets, net 2,912 5,622 - - 8,534 Total Assets $ 3,204,812 $ 3,985,824 $ 119,659 $ (3,860,738 ) $ 3,449,557 Liabilities and Stockholders' Equity Current liabilities: Accounts payable $ 27,174 $ 468,891 $ 21,903 $ (14,271 ) $ 503,697 Accrued expenses 51,183 204,173 5,941 - 261,297 Current portions of long-term obligations 4,500 9,641 - - 14,141 Total current liabilities 82,857 682,705 27,844 (14,271 ) 779,135 Intercompany payable, net 618,881 - 36,491 (655,372 ) - Borrowings under revolving lines of credit, net - - 3,205 - 3,205 Long-term debt, net 721,268 - - - 721,268 Deferred income taxes, net - 168,209 996 (30,822 ) 138,383 Long-term obligations under equipment financing and other, net - 23,147 66 - 23,213 Other long-term liabilities 2,547 - - 2,547 Total liabilities 1,423,006 876,608 68,602 (700,465 ) 1,667,751 Total stockholders' equity 1,781,806 3,109,216 51,057 (3,160,273 ) 1,781,806 Total Liabilities and Stockholders' Equity $ 3,204,812 $ 3,985,824 $ 119,659 $ (3,860,738 ) $ 3,449,557 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Balance Sheets (Unaudited; In thousands) March 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Assets Current assets: Cash and cash equivalents $ - $ 24,181 $ 1,946 $ (16,115 ) $ 10,012 Accounts receivable, net - 490,724 15,437 225 506,386 Inventories, net - 556,463 24,426 - 580,889 Prepaid expenses and other current assets 28,952 184,764 3,673 - 217,389 Total current assets 28,952 1,256,132 45,482 (15,890 ) 1,314,676 Intercompany receivable, net - 961,450 - (961,450 ) - Investments in consolidated subsidiaries 2,959,542 - - (2,959,542 ) - Deferred income taxes, net 57,419 - - (57,419 ) - Property and equipment, net 5,614 140,918 9,848 - 156,380 Goodwill - 1,198,805 29,254 - 1,228,059 Intangibles, net - 436,513 2,994 - 439,507 Other assets, net 1,242 269 - - 1,511 Total Assets $ 3,052,769 $ 3,994,087 $ 87,578 $ (3,994,301 ) $ 3,140,133 Liabilities and Stockholders' Equity Current liabilities: Accounts payable $ 27,209 $ 468,144 $ 6,865 $ (15,890 ) $ 486,328 Accrued expenses 26,226 103,045 1,993 - 131,264 Current portions of long-term obligations 4,500 9,514 - - 14,014 Total current liabilities 57,935 580,703 8,858 (15,890 ) 631,606 Intercompany payable, net 923,565 - 37,885 (961,450 ) - Borrowings under revolving lines of credit - 269,124 - - 269,124 Long-term debt, net 722,101 - - - 722,101 Deferred income taxes, net - 194,556 358 (57,419 ) 137,495 Long-term obligations under equipment financing and other, net - 28,221 46 - 28,267 Other long-term liabilities - 2,372 - - 2,372 Total liabilities 1,703,601 1,074,976 47,147 (1,034,759 ) 1,790,965 Total stockholders' equity 1,349,168 2,919,111 40,431 (2,959,542 ) 1,349,168 Total Liabilities and Stockholders' Equity $ 3,052,769 $ 3,994,087 $ 87,578 $ (3,994,301 ) $ 3,140,133
Condensed Consolidating Statements of Operations	BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Operations (Unaudited; In thousands) Three Months Ended March 31, 2018 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations and Other Consolidated Net sales $ - $ 1,404,617 $ 21,008 $ - $ 1,425,625 Cost of products sold - 1,070,605 16,643 - 1,087,248 Gross profit - 334,012 4,365 - 338,377 Operating expense 3,115 384,245 8,415 - 395,775 Intercompany charges (income) (1,477 ) 1,477 - - - Income (loss) from operations (1,638 ) (51,710 ) (4,050 ) - (57,398 ) Interest expense, financing costs, and other 47,220 3,807 (11,457 ) - 39,570 Intercompany interest expense (income) (5,181 ) 4,804 377 - - Income (loss) before provision for income taxes (43,677 ) (60,321 ) 7,030 - (96,968 ) Provision for (benefit from) income taxes (10,469 ) (18,575 ) (1,269 ) - (30,313 ) Income (loss) before equity in net income of subsidiaries (33,208 ) (41,746 ) 8,299 - (66,655 ) Equity in net income of subsidiaries (33,447 ) - - 33,447 - Net income (loss) $ (66,655 ) $ (41,746 ) $ 8,299 $ 33,447 $ (66,655 ) Three Months Ended March 31, 2017 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations and Other Consolidated Net sales $ - $ 849,226 $ 21,498 $ - $ 870,724 Cost of products sold - 649,595 16,652 - 666,247 Gross profit - 199,631 4,846 - 204,477 Operating expense 7,010 193,448 7,075 - 207,533 Intercompany charges (income) (12,555 ) 11,993 562 - - Income (loss) from operations 5,545 (5,810 ) (2,791 ) - (3,056 ) Interest expense, financing costs, and other 3,983 8,003 282 - 12,268 Intercompany interest expense (income) (5,089 ) 5,089 - - - Income (loss) before provision for income taxes 6,651 (18,902 ) (3,073 ) - (15,324 ) Provision for (benefit from) income taxes 2,444 (7,568 ) (844 ) - (5,968 ) Income (loss) before equity in net income of subsidiaries 4,207 (11,334 ) (2,229 ) - (9,356 ) Equity in net income of subsidiaries (13,563 ) - - 13,563 - Net income (loss) $ (9,356 ) $ (11,334 ) $ (2,229 ) $ 13,563 $ (9,356 ) BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Operations (Unaudited; In thousands) Six Months Ended March 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net sales $ - $ 2,480,879 $ 66,725 $ - $ 2,547,604 Cost of products sold - 1,887,041 52,433 - 1,939,474 Gross profit - 593,838 14,292 - 608,130 Operating expense 3,438 595,000 17,994 - 616,432 Intercompany charges (income) (584 ) 584 - - - Income (loss) from operations (2,854 ) (1,746 ) (3,702 ) - (8,302 ) Interest expense, financing costs, and other 57,296 4,632 210 - 62,138 Intercompany interest expense (income) (10,889 ) 10,125 764 - - Income (loss) before provision for income taxes (49,261 ) (16,503 ) (4,676 ) - (70,440 ) Provision for (benefit from) income taxes (4,948 ) (65,247 ) (1,186 ) - (71,381 ) Income (loss) before equity in net income of subsidiaries (44,313 ) 48,744 (3,490 ) - 941 Equity in net income of subsidiaries 45,254 - - (45,254 ) - Net income (loss) $ 941 $ 48,744 $ (3,490 ) $ (45,254 ) $ 941 Six Months Ended March 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net sales $ - $ 1,809,461 $ 63,447 $ - $ 1,872,908 Cost of products sold - 1,368,129 49,235 - 1,417,364 Gross profit - 441,332 14,212 - 455,544 Operating expense 15,656 380,521 15,466 - 411,643 Intercompany charges (income) (24,508 ) 23,392 1,116 - - Income (loss) from operations 8,852 37,419 (2,370 ) - 43,901 Interest expense, financing costs, and other 19,337 5,458 1,047 - 25,842 Intercompany interest expense (income) (10,682 ) 10,682 - - - Income (loss) before provision for income taxes 197 21,279 (3,417 ) - 18,059 Provision for (benefit from) income taxes (410 ) 8,334 (939 ) - 6,985 Income (loss) before equity in net income of subsidiaries 607 12,945 (2,478 ) - 11,074 Equity in net income of subsidiaries 10,467 - - (10,467 ) - Net income (loss) $ 11,074 $ 12,945 $ (2,478 ) $ (10,467 ) $ 11,074
Condensed Consolidating Statements of Comprehensive Income	BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Comprehensive Income (Unaudited; In thousands) Three Months Ended March 31, 2018 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations and Other Consolidated Net income (loss) $ (66,655 ) $ (41,746 ) $ 8,299 $ 33,447 $ (66,655 ) Other comprehensive income (loss): Foreign currency translation adjustment (2,028 ) - (2,028 ) 2,028 (2,028 ) Total other comprehensive income (loss) (2,028 ) - (2,028 ) 2,028 (2,028 ) Comprehensive income (loss) $ (68,683 ) $ (41,746 ) $ 6,271 $ 35,475 $ (68,683 ) Three Months Ended March 31, 2017 Parent Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations and Other Consolidated Net income (loss) $ (9,356 ) $ (11,334 ) $ (2,229 ) $ 13,563 $ (9,356 ) Other comprehensive income (loss): Foreign currency translation adjustment 813 - 813 (813 ) 813 Total other comprehensive income (loss) 813 - 813 (813 ) 813 Comprehensive income (loss) $ (8,543 ) $ (11,334 ) $ (1,416 ) $ 12,750 $ (8,543 ) Six Months Ended March 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net income (loss) $ 941 $ 48,744 $ (3,490 ) $ (45,254 ) $ 941 Other comprehensive income (loss): Foreign currency translation adjustment (1,971 ) - (1,971 ) 1,971 (1,971 ) Total other comprehensive income (loss) (1,971 ) - (1,971 ) 1,971 (1,971 ) Comprehensive income (loss) $ (1,030 ) $ 48,744 $ (5,461 ) $ (43,283 ) $ (1,030 ) Six Months Ended March 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net income (loss) $ 11,074 $ 12,945 $ (2,478 ) $ (10,467 ) $ 11,074 Other comprehensive income (loss): Foreign currency translation adjustment (839 ) - (839 ) 839 (839 ) Total other comprehensive income (loss) (839 ) - (839 ) 839 (839 ) Comprehensive income (loss) $ 10,235 $ 12,945 $ (3,317 ) $ (9,628 ) $ 10,235
Condensed Consolidating Statements of Cash Flows	BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Cash Flows (Unaudited; In thousands) Six Months Ended March 31, 2018 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net cash provided by (used in) operating activities $ (47,488 ) $ 77,948 $ 9,289 $ 217 $ 39,966 Investing Activities Purchases of property and equipment (5,050 ) (18,524 ) (1,259 ) - (24,833 ) Acquisition of businesses, net (2,726,561 ) - - - (2,726,561 ) Proceeds from the sale of assets - 398 15 - 413 Intercompany activity 606,865 - - (606,865 ) - Net cash provided by (used in) investing activities (2,124,746 ) (18,126 ) (1,244 ) (606,865 ) (2,750,981 ) Financing Activities Borrowings under revolving lines of credit - 1,514,102 16,565 - 1,530,667 Repayments under revolving lines of credit - (1,077,744 ) (19,719 ) - (1,097,463 ) Borrowings under term loan 970,000 - - - 970,000 Repayments under term loan (441,000 ) - - - (441,000 ) Repayments under equipment financing facilities and other - (5,643 ) - - (5,643 ) Borrowings under senior notes 1,300,000 - - - 1,300,000 Payment of debt issuance costs (55,893 ) (11,830 ) - - (67,723 ) Proceeds from issuance of convertible preferred stock 400,000 - - - 400,000 Payment of stock issuance costs (1,279 ) - - - (1,279 ) Payment of dividends on preferred stock (978 ) - - - (978 ) Proceeds from issuance of common stock related to equity awards 5,317 - - - 5,317 Taxes paid related to net share settlement of equity awards (3,933 ) - - - (3,933 ) Intercompany activity - (609,760 ) 923 608,837 - Net cash provided by (used in) financing activities 2,172,234 (190,875 ) (2,231 ) 608,837 2,587,965 Effect of exchange rate changes on cash and cash equivalents - - 800 - 800 Net increase (decrease) in cash and cash equivalents - (131,053 ) 6,614 2,189 (122,250 ) Cash and cash equivalents, beginning of period - 149,799 1,582 (13,131 ) 138,250 Cash and cash equivalents, end of period $ - $ 18,746 $ 8,196 $ (10,942 ) $ 16,000 BEACON ROOFING SUPPLY, INC. Condensed Consolidating Statements of Cash Flows (Unaudited; In thousands) Six Months Ended March 31, 2017 Parent Guarantor Subsidiaries Non- Guarantor Subsidiaries Eliminations and Other Consolidated Net cash provided by (used in) operating activities $ (29,347 ) $ 181,934 $ 5,121 $ (7,178 ) $ 150,530 Investing Activities Purchases of property and equipment (1,709 ) (21,742 ) (780 ) - (24,231 ) Acquisition of businesses (58,359 ) - - - (58,359 ) Proceeds from the sale of assets - 1,274 11 - 1,285 Intercompany activity 83,397 - - (83,397 ) - Net cash provided by (used in) investing activities 23,329 (20,468 ) (769 ) (83,397 ) (81,305 ) Financing Activities Borrowings under revolving lines of credit - 852,583 4,516 - 857,099 Repayments under revolving lines of credit - (939,438 ) (9,032 ) - (948,470 ) Repayments under term loan (1,125 ) - - - (1,125 ) Repayments under equipment financing facilities and other - (5,365 ) - - (5,365 ) Proceeds from issuance of common stock 7,840 - - - 7,840 Taxes paid related to net share settlement of equity awards (697 ) - - - (697 ) Intercompany activity - (82,512 ) (885 ) 83,397 - Net cash provided by (used in) financing activities 6,018 (174,732 ) (5,401 ) 83,397 (90,718 ) Effect of exchange rate changes on cash and cash equivalents - - 119 - 119 Net increase (decrease) in cash and cash equivalents - (13,266 ) (930 ) (7,178 ) (21,374 ) Cash and cash equivalents, beginning of period - 37,447 2,876 (8,937 ) 31,386 Cash and cash equivalents, end of period $ - $ 24,181 $ 1,946 $ (16,115 ) $ 10,012

Company Overview - Additional I

Company Overview - Additional Information (Detail) $ in Millions	Jan. 02, 2017USD ($)	Mar. 31, 2018	Dec. 31, 2017StateProvince
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
Company Overview [Line Items]
Number of states in which entity operates | State			50
Canada
Company Overview [Line Items]
Number of provinces in which entity operates | Province			6

Summary of Significant Accoun31

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2018
Accounting Standards Update 2016-09 [Member]
Significant Accounting Policies [Line Items]
Excess tax benefits recognized	$ 0.4	$ 2.9

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail)	May 01, 2017USD ($)Location	Mar. 01, 2017USD ($)Location	Jan. 09, 2017USD ($)Location	Jan. 03, 2017USD ($)Location	Jan. 02, 2017USD ($)StateLocation$ / sharesshares	Dec. 16, 2016USD ($)Location	Mar. 31, 2018USD ($)$ / sharesshares	Mar. 31, 2017USD ($)$ / sharesshares	Mar. 31, 2018USD ($)$ / sharesshares	Mar. 31, 2017USD ($)$ / sharesshares	Sep. 30, 2017USD ($)BranchBusiness$ / sharesshares	Oct. 25, 2017USD ($)	Sep. 30, 2016USD ($)
Business Acquisition [Line Items]
Preferred stock, issuance | shares							0	0	0	0	0
Proceeds from convertible preferred stock									$ 400,000,000	$ 0
Mezzanine equity							$ 399,195,000		399,195,000
Stock issuance costs									$ 1,279,000	$ 0
Common stock, par value | $ / shares							$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Number Of Business Locations Acquired | Branch											23
Net sales							$ 1,425,625,000	$ 870,724,000	$ 2,547,604,000	$ 1,872,908,000
Net income (loss)							(66,655,000)	(9,356,000)	941,000	11,074,000
Number Of Business Locations Acquired | Business											5
Business Acquisition, sales reported by acquired entity for last annual period									3,213,253,000	3,029,811,000
Business Acquisitions Purchase Price Allocation Goodwill Amount							2,381,620,000	$ 1,228,059,000	2,381,620,000	$ 1,228,059,000	$ 1,251,986,000		$ 1,197,565,000
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
Estimated working capital adjustment							120,900,000
Number Of Business Locations Acquired | Location					208
Number Of States Business Location Acquired | State					31
Net sales							534,100,000		534,100,000
Net income (loss)							$ (13,000,000)		$ (13,000,000)
Business Acquisitions Purchase Price Allocation Goodwill Amount					$ 1,130,635,000
Business Acquisitions Purchase Price Allocation Intangible Assets Other Than Goodwill					$ 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
Stock 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
Business Acquisition [Line Items]
Acquisition purchase price in cash					$ 2,625,000,000
BJ Supply Company
Business Acquisition [Line Items]
Number Of Business Locations Acquired | Location						1
Business Acquisition, sales reported by acquired entity for last annual period						$ 4,000,000
American Building and Roofing, Inc
Business Acquisition [Line Items]
Number Of Business Locations Acquired | Location				7
Business Acquisition, sales reported by acquired entity for last annual period				$ 36,000,000
Eco Insulation Supply [Member]
Business Acquisition [Line Items]
Number Of Business Locations Acquired | Location			1
Business Acquisition, sales reported by acquired entity for last annual period			$ 8,000,000
Acme Building Materials Inc
Business Acquisition [Line Items]
Number Of Business Locations Acquired | Location		3
Business Acquisition, sales reported by acquired entity for last annual period		$ 13,000,000
Lowry's Inc.
Business Acquisition [Line Items]
Number Of Business Locations Acquired | Location	11
Business Acquisition, sales reported by acquired entity for last annual period	$ 76,000,000
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Business Acquisitions Purchase Price Allocation Goodwill Amount											53,000,000
Business Acquisitions Purchase Price Allocation Intangible Assets Other Than Goodwill											$ 47,400,000

Acquisitions - Schedule of Reco

Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2017	Jan. 02, 2017	Sep. 30, 2016
Business Combination Separately Recognized Transactions [Line Items]
Goodwill	$ 2,381,620	$ 1,251,986	$ 1,228,059		$ 1,197,565
Allied Acquisition [Member]
Business Combination Separately Recognized Transactions [Line Items]
Cash				$ 19,322
Accounts receivable				315,485
Inventory				322,705
Prepaid and other current assets				59,279
Property, plant, and equipment				139,528
Goodwill				1,130,635
Intangible assets				1,037,000
Current liabilities				(271,252)
Non-current liabilities				(6,820)
Total purchase price				$ 2,745,882

Acquisitions - Business Acquisi

Acquisitions - Business Acquisition, Pro Forma Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition Pro Forma Information [Abstract]
Net sales	$ 3,213,253	$ 3,029,811
Net income (loss)	$ (37,153)	$ (33,094)

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		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income (loss)	$ (66,655)	$ (9,356)	$ 941	$ 11,074
Less: Dividends on preferred shares, declared	6,000		6,000
Net income (loss) attributable to common shareholders	$ (72,655)	$ (9,356)	$ (5,059)	$ 11,074
Weighted-average common shares outstanding, basic	68,019,300	60,141,580	67,922,276	60,041,332
Effect of common share equivalents				1,028,606
Weighted-average common shares outstanding, diluted	68,019,300	60,141,580	67,922,276	61,069,938
Net income (loss) per share - basic	$ (1.07)	$ (0.16)	$ (0.07)	$ 0.18
Net income (loss) per share - diluted	$ (1.07)	$ (0.16)	$ (0.07)	$ 0.18

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		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	275,209	270,428	281,742	416,085
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	90,024		45,012	123,780

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Stockholders Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Class Of Stock [Line Items]
Balance			$ 1,781,806
Beginning Balance(in shares)			67,700,858
Issuance of common stock, net of shares withheld for taxes			$ 1,384
Issuance costs related to secondary offering of common stock			(474)
Stock-based compensation			7,835
Other comprehensive income (loss)			(1,971)
Net income (loss)	$ (66,655)	$ (9,356)	941	$ 11,074
Dividends on preferred shares, declared	(6,000)	0	(6,000)	0
Balance	$ 1,783,521	$ 1,349,168	$ 1,783,521	$ 1,349,168
Ending Balance(in shares)	68,043,284	60,255,320	68,043,284	60,255,320
Common Stock [Member]
Class Of Stock [Line Items]
Balance			$ 677
Beginning Balance(in shares)			67,700,858
Issuance of common stock, net of shares withheld for taxes			$ 3
Issuance of common stock, net of shares withheld for taxes (in shares)			342,426
Balance	$ 680		$ 680
Ending Balance(in shares)	68,043,284		68,043,284
Additional Paid-in Capital [Member]
Class Of Stock [Line Items]
Balance			$ 1,047,506
Issuance of common stock, net of shares withheld for taxes			1,381
Issuance costs related to secondary offering of common stock			(474)
Stock-based compensation			7,835
Balance	$ 1,056,248		1,056,248
Retained Earnings [Member]
Class Of Stock [Line Items]
Balance			748,186
Net income (loss)			941
Dividends on preferred shares, declared			(6,000)
Balance	743,127		743,127
Accumulated Other Comprehensive Loss [Member]
Class Of Stock [Line Items]
Balance			(14,563)
Other comprehensive income (loss)			(1,971)
Balance	$ (16,534)		$ (16,534)

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - shares	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2017
Equity [Abstract]
Common stock (voting), shares authorized	100,000,000	100,000,000	100,000,000
Common Stock (Voting), issued	68,043,284	67,700,858	60,255,320
Common Stock (voting), outstanding	68,043,284	67,700,858	60,255,320

Stockholders' Equity - Reclassi

Stockholders' Equity - Reclassification out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			$ 1,781,806
Other comprehensive income before reclassifications	$ (2,028)	$ 813	(1,971)	$ (839)
Balance	1,783,521	$ 1,349,168	1,783,521	$ 1,349,168
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(14,563)
Other comprehensive income before reclassifications			(1,971)
Balance	(16,534)		(16,534)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(14,563)
Other comprehensive income before reclassifications			(1,971)
Balance	$ (16,534)		$ (16,534)

Stock-based Compensation - Addi

Stock-based Compensation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 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	3,723,984		3,723,984
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 Expire			10 years
Allocated stock-based compensation expense	$ 0.8	$ 1.3	$ 1.9	$ 2.6
Unrecognized compensation cost related to unvested stock	6.7		$ 6.7
Unrecognized compensation cost related to unvested stock, expected weighted-average period of recognition			2 years 1 month 6 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated stock-based compensation expense	3.5	$ 2.5	$ 5.9	$ 5
Unrecognized compensation cost related to unvested stock	$ 26.2		$ 26.2
Unrecognized compensation cost related to unvested stock, expected weighted-average period of recognition			2 years
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 Values of Options, Black-Scholes Option-Pricing Model, Weighted-Average Assumptions (Detail)	6 Months Ended
	Mar. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Risk-free interest rate	2.10%
Expected volatility	26.43%
Expected life (in years)	5 years 5 months 15 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	6 Months Ended	12 Months Ended
	Mar. 31, 2018	Sep. 30, 2017
Options Outstanding
Balance as of September 30, 2017	2,084,228
Granted	276,370
Exercised	(217,397)
Canceled/Forfeited	(47,842)
Expired	(1,991)
Balance as of March 31, 2018	2,093,368	2,084,228
Vested and expected to vest after March 31, 2018	2,071,674
Exercisable as of March 31, 2018	1,512,437
Weighted-Average Exercise Price
Beginning Balance	$ 28.84
Granted	55.17
Exercised	24.46
Canceled/Forfeited	41.82
Expired	15.28
Ending Balance	32.48	$ 28.84
Vested and expected to vest after March 31, 2018	32.32
Exercisable as of March 31, 2018	$ 27.48
Weighted-Average Remaining Contractual Life
Balance	6 years 2 months 12 days	6 years 1 month 6 days
Vested and expected to vest after March 31, 2018	6 years 1 month 6 days
Exercisable as of March 31, 2018	5 years 2 months 12 days
Aggregate Intrinsic Value
Balance	$ 43,646	$ 46,714
Vested and expected to vest after March 31, 2018	43,510
Exercisable as of March 31, 2018	$ 38,704

Stock-based compensation - St43

Stock-based compensation - Stock Option Grants, Vesting, and Exercises (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Weighted-average fair value of stock options granted	$ 15.86	$ 14.21
Total fair value of stock options vested	$ 3,832	$ 4,977
Total intrinsic value of stock options exercised	$ 7,700	$ 7,906

Stock-based Compensation - Rest

Stock-based Compensation - Restricted Shares and Units Outstanding and Activity During the Period (Detail) - $ / shares	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Weighted - Average Grant Date Fair Value
Granted	$ 57.40	$ 47.27
Restricted Stock Units (RSUs) [Member]
Outstanding
Balance at September 30, 2017	770,973
Granted	370,190
Performance awards	41,440
Released	(189,154)
Canceled/Forfeited	(35,974)
Balance at March 31, 2018	957,475
Vested and expected to vest after March 31, 2018	936,924
Weighted - Average Grant Date Fair Value
Balance at September 30, 2017	$ 38.95
Granted	57.40
Performance awards	39.56
Released	31.63
Canceled/Forfeited	47.65
Balance at March 31, 2018	47.23
Vested and expected to vest after March 31, 2018	$ 47.10

Stock-based Compensation - Sche

Stock-based Compensation - Schedule Of Restricted Stock Units Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Weighted-average fair value of RSUs granted	$ 57.40	$ 47.27
Total fair value of RSUs vested	$ 6,523	$ 2,736
Total intrinsic value of RSUs released	$ 10,924	$ 3,074

Goodwill and Intangible Asset46

Goodwill and Intangible Assets - Summary of Changes in goodwill (Detail) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance	$ 1,251,986	$ 1,197,565
Acquisitions	1,130,635	31,005
Translation and other adjustments	(1,001)	(511)
Ending balance	$ 2,381,620	$ 1,228,059

Goodwill and Intangible Asset47

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Goodwill And Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 1,040		$ 47.4
Amortization of Intangible Assets	$ 37.1	$ 20.3	$ 55.3	$ 40.4
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 10 months 24 days
Trademarks [Member]
Goodwill And Intangible Assets [Line Items]
Indefinite-lived Intangible Assets Acquired			$ 120
Customer Relationships [Member]
Goodwill And Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 910		42.7
Customer Relationships [Member] | Weighted Average [Member]
Goodwill And Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			19 years 29 days
Trademarks [Member]
Goodwill And Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired					4.6
Trademarks [Member] | Weighted Average [Member]
Goodwill And Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			7 years 11 months 19 days
Beneficial Lease Arrangements [Member]
Goodwill And Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 6.6		$ 0.1
Beneficial Lease Arrangements [Member] | Weighted Average [Member]
Goodwill And Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			4 years 11 months 15 days

Goodwill and Intangible Asset48

Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2017
Finite Lived Intangible Assets [Line Items]
Amortizable intangible assets	$ 1,540,734		$ 624,410	$ 592,482
Less: Accumulated amortization	(323,482)		(268,391)	(226,025)
Total amortizable intangible assets, net	1,217,252	$ 1,217,252	356,019	366,457
Indefinite lived trademarks	193,050		73,050	73,050
Total intangibles, net	$ 1,410,302		429,069	439,507
Weighted Average [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	18 years 10 months 24 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 10 months 28 days
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Amortizable intangible assets	$ 1,519,766		610,026	582,028
Customer Relationships [Member] | Weighted Average [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	19 years 29 days
Trademarks [Member]
Finite Lived Intangible Assets [Line Items]
Amortizable intangible assets	$ 10,500		10,500	6,670
Trademarks [Member] | Weighted Average [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years 11 months 19 days
Beneficial Lease Arrangements [Member]
Finite Lived Intangible Assets [Line Items]
Amortizable intangible assets	$ 7,644		$ 1,060	$ 960
Beneficial Lease Arrangements [Member] | Weighted Average [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years 11 months 15 days

Goodwill and Intangible Asset49

Goodwill and Intangible Assets - Summary of Estimated Future Amortization (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
2018 (Apr - Sept)		$ 74,619
2,019		188,832
2,020		181,762
2,021		152,665
2,022		125,020
Thereafter		494,354
Total amortizable intangible assets, net	$ 1,217,252	$ 1,217,252	$ 356,019	$ 366,457

Financing Arrangements - Long-t

Financing Arrangements - Long-term Debt Instruments (Detail) - USD ($)		Mar. 31, 2018		Jan. 02, 2018	Sep. 30, 2017	Mar. 31, 2017		Oct. 02, 2015
Debt Instrument [Line Items]
Borrowings under revolving lines of credit/term loans, net		$ 424,528,000			$ 3,205,000	$ 269,124,000
Senior Notes, Less: current portion		0			0	0
Total long-term borrowings under Senior Notes		1,571,680,000			292,328,000	291,689,000
Long-term debt, net		2,493,889,000			721,268,000	722,101,000
Equipment financing facilities, various maturities through September 2021	[1]	13,347,000			12,898,000	15,577,000
Capital lease obligations, various maturities through November 2021	[2]	14,863,000			19,956,000	22,204,000
Long-term obligations under equipment financing and other, net		18,313,000			23,213,000	28,267,000
Senior Notes, Matures October 2023 [Member]
Debt Instrument [Line Items]
Senior Notes	[3]	292,967,000			292,328,000	291,689,000
Senior Notes, Matures November 2025 [Member]
Debt Instrument [Line Items]
Senior Notes	[4]	1,278,713,000
Equipment Financing Facilities and Other [Member]
Debt Instrument [Line Items]
Total obligations under equipment financing facilities and other		28,210,000			32,854,000	37,781,000
Less: current portion		(9,897,000)			(9,641,000)	(9,514,000)
Long-term obligations under equipment financing and other, net		18,313,000			23,213,000	28,267,000
Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Borrowings under revolving lines of credit/term loans, net		424,528,000			3,205,000	269,124,000
Revolving Lines of Credit [Member] | 2020 ABL [Member] | U.S. [Member]
Debt Instrument [Line Items]
Total Borrowings under revolving lines of credit/term loans						269,124,000	[5]	$ 670,000,000
Revolving Lines of Credit [Member] | 2020 ABL [Member] | Canada [Member]
Debt Instrument [Line Items]
Total Borrowings under revolving lines of credit/term loans	[6]				3,205,000
Revolving Lines of Credit [Member] | 2023 ABL [Member]
Debt Instrument [Line Items]
Total Borrowings under revolving lines of credit/term loans		424,500,000
Revolving Lines of Credit [Member] | 2023 ABL [Member] | U.S. [Member]
Debt Instrument [Line Items]
Total Borrowings under revolving lines of credit/term loans	[7]	424,528,000
Term Loan [Member]
Debt Instrument [Line Items]
Less: current portion		(9,700,000)			(4,500,000)	(4,500,000)
Borrowings under revolving lines of credit/term loans, net		922,209,000			428,940,000	430,412,000
Term Loan [Member] | Term Loan, Matures January 2, 2025 [Member]
Debt Instrument [Line Items]
Total Borrowings under revolving lines of credit/term loans		$ 931,909,000	[8]	$ 970,000,000
Term Loan [Member] | Term Loan, Matures October 1, 2022 [Member]
Debt Instrument [Line Items]
Total Borrowings under revolving lines of credit/term loans	[9]				$ 433,440,000	$ 434,912,000
[1]	Fixed interest rates ranging from 2.33% to 3.25% as of March 31, 2018, September 30, 2017, and March 31, 2017
[2]	Fixed interest rates ranging from 2.72% to 10.39% as of March 31, 2018 , September 30, 2017, and March 31, 2017
[3]	Interest rate of 6.38% as of March 31, 2018, September 30, 2017 and March 31, 2017
[4]	Interest rate of 4.88% as of March 31, 2018
[5]	Extinguished on January 2, 2018 ; Effective rate on borrowings of 2.97% as of March 31, 2017
[6]	Extinguished on January 2, 2018; Effective rate on borrowings of  3.70% as of September 30, 2017
[7]	Effective rate on borrowings of 3.41% as of March 31, 2018
[8]	Interest rate of 3.94% as of March 31, 2018
[9]	Extinguished on January 2, 2018; Interest rate of 3.50% as of September 30, 2017 and March 31, 2017

Financing Arrangements - Long51

Financing Arrangements - Long-term Debt Instruments (Parenthetical) (Detail)	Jan. 02, 2018	Oct. 25, 2017	Oct. 02, 2015	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Equipment Financing Facilities [Member]
Debt Instrument [Line Items]
Debt instrument maturity date				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
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
Senior Notes, Matures November 2025 [Member]
Debt Instrument [Line Items]
Debt interest rate at period end		4.875%		4.88%
Debt instrument maturity date		Nov. 1, 2025		Nov. 1, 2025
Revolving Lines of Credit [Member] | 2020 ABL [Member]
Debt Instrument [Line Items]
Debt instrument maturity date			Oct. 2, 2010
Revolving Lines of Credit [Member] | 2020 ABL [Member] | U.S. [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End					2.97%
Line of Credit Facility, Expiration Date				Oct. 1, 2020
Debt extinguishment date				Jan. 2, 2018
Revolving Lines of Credit [Member] | 2020 ABL [Member] | Canada [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End						3.70%
Line of Credit Facility, Expiration Date				Oct. 1, 2020
Debt extinguishment date				Jan. 2, 2018
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				3.41%
Line of Credit Facility, Expiration Date				Jan. 2, 2023
Revolving Lines of Credit [Member] | 2023 ABL [Member] | Canada [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Expiration Date				Jan. 2, 2023
Term Loan [Member] | Term Loan, Matures October 1, 2022 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End					3.50%	3.50%
Line of Credit Facility, Expiration Date				Oct. 1, 2022
Debt extinguishment date				Jan. 2, 2018
Term Loan [Member] | Term Loan, Matures January 2, 2025 [Member]
Debt Instrument [Line Items]
Debt interest rate at period end				3.94%
Debt instrument maturity date	Jan. 2, 2025			Jan. 2, 2025

Financing Arrangements - Additi

Financing Arrangements - Additional Information (Detail)		Jan. 02, 2018USD ($)	Oct. 25, 2017USD ($)	Oct. 02, 2015USD ($)	Mar. 31, 2018USD ($)Covenant		Mar. 31, 2017USD ($)		Sep. 30, 2017USD ($)
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 3,570,000,000		$ 1,450,000,000
Borrowings under senior notes					$ 1,300,000,000		$ 0
Payments of debt issuance costs		67,700,000			67,723,000		0
Gains (Losses) on Extinguishment of Debt					(1,725,000)		0
Equipment financing facilities, various maturities through September 2021	[1]				13,347,000		15,577,000		$ 12,898,000
Capital lease obligations, various maturities through November 2021	[2]				$ 14,863,000		$ 22,204,000		$ 19,956,000
Equipment Financing Facilities and Other [Member]
Debt Instrument [Line Items]
Debt instrument maturity date					Sep. 30, 2021
Equipment financing facilities, various maturities through September 2021					$ 13,300,000
Equipment Financing Facilities and Other [Member] | Minimum [Member]
Debt Instrument [Line Items]
Percentage of Fixed Interest Rate of Equipment Financing Facilities					2.33%		2.33%		2.33%
Equipment Financing Facilities and Other [Member] | Maximum [Member]
Debt Instrument [Line Items]
Percentage of Fixed Interest Rate of Equipment Financing Facilities					3.25%		3.25%		3.25%
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt instrument maturity date					Nov. 30, 2021
Capital lease obligations, various maturities through November 2021					$ 14,900,000
Capital Lease Obligations [Member] | Minimum [Member]
Debt Instrument [Line Items]
Capital Leases of Lessor, Contingent Rentals, Basis Spread on Variable Rate					2.72%
Capital Lease Obligations [Member] | Maximum [Member]
Debt Instrument [Line Items]
Capital Leases of Lessor, Contingent Rentals, Basis Spread on Variable Rate					10.39%
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
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
Debt instrument maturity date			Nov. 1, 2025		Nov. 1, 2025
Unamortized debt issuance costs					$ 21,300,000
Debt instrument, aggregate principal amount			$ 1,300,000,000
Debt instrument interest rate			4.875%		4.88%
Debt instrument, issue price percentage			100.00%
Senior Notes Payable	[3]				$ 1,278,713,000
Senior Notes, Matures October 2023 [Member]
Debt Instrument [Line Items]
Borrowings under senior notes				$ 300,000,000
Debt instrument maturity date				Oct. 1, 2023	Oct. 1, 2023
Unamortized debt issuance costs					$ 7,000,000
Debt instrument interest rate					6.38%		6.38%		6.38%
Senior Notes Payable	[4]				$ 292,967,000		$ 291,689,000		$ 292,328,000
Debt instrument, coupon rate				6.38%
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
Long-term Line of Credit					$ 424,500,000
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%
Unamortized debt issuance costs					$ 11,800,000
Revolving Lines of Credit [Member] | 2023 ABL [Member] | U.S. [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,200,000,000
Long-term Line of Credit	[5]				424,528,000
Standby letters of credit outstanding					14,800,000
Revolving Lines of Credit [Member] | 2023 ABL [Member] | Canada [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		100,000,000
Revolving Lines of Credit [Member] | 2020 ABL [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 700,000,000
Proceeds from Lines of Credit				$ 350,000,000
Debt instrument maturity date				Oct. 2, 2010
Debt instrument paid off date				Jan. 2, 2018
Revolving Lines of Credit [Member] | 2020 ABL [Member] | U.S. [Member]
Debt Instrument [Line Items]
Long-term Line of Credit				$ 670,000,000			$ 269,124,000	[6]
Revolving Lines of Credit [Member] | 2020 ABL [Member] | Canada [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				30,000,000
Long-term Line of Credit	[7]								$ 3,205,000
Term Loan [Member] | Term Loan, Matures January 2, 2025 [Member]
Debt Instrument [Line Items]
Long-term Line of Credit		$ 970,000,000			$ 931,909,000	[8]
Debt instrument maturity date		Jan. 2, 2025			Jan. 2, 2025
Unamortized debt issuance costs					$ 38,100,000
Debt Instrument, Frequency of Periodic Payment		quarterly
Debt Instrument, Periodic Payment		$ 2,400,000
Debt instrument interest rate					3.94%
Term Loan [Member] | 2022 Term Loan [Member]
Debt Instrument [Line Items]
Long-term Line of Credit				$ 450,000,000
Debt instrument maturity date				Oct. 1, 2022
Debt Instrument, Frequency of Periodic Payment					quarterly
Debt Instrument, Periodic Payment				$ 1,100,000
Debt instrument paid off date				Jan. 2, 2018
Write off of debt issuance costs				$ 700,000
[1]	Fixed interest rates ranging from 2.33% to 3.25% as of March 31, 2018, September 30, 2017, and March 31, 2017
[2]	Fixed interest rates ranging from 2.72% to 10.39% as of March 31, 2018 , September 30, 2017, and March 31, 2017
[3]	Interest rate of 4.88% as of March 31, 2018
[4]	Interest rate of 6.38% as of March 31, 2018, September 30, 2017 and March 31, 2017
[5]	Effective rate on borrowings of 3.41% as of March 31, 2018
[6]	Extinguished on January 2, 2018 ; Effective rate on borrowings of 2.97% as of March 31, 2017
[7]	Extinguished on January 2, 2018; Effective rate on borrowings of  3.70% as of September 30, 2017
[8]	Interest rate of 3.94% as of March 31, 2018

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Minimum Rental Commitments under Non-cancelable Operating Leases (Detail) $ in Thousands	Mar. 31, 2018USD ($)
Commitments And Contingencies Disclosure [Abstract]
2018 (April - Sept)	$ 39,484
2,019	99,398
2,020	86,089
2,021	75,097
2,022	55,207
Thereafter	135,396
Total minimum lease payments	$ 490,671

Commitments and Contingencies54

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense, Net, Total	$ 28.5	$ 14.7	$ 43.7	$ 28.9

Geographic Data - Schedule Of G

Geographic Data - Schedule Of Geographic Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Segment Reporting Information [Line Items]
Net sales	$ 1,425,625	$ 870,724	$ 2,547,604	$ 1,872,908
Long-lived assets	1,512,985	524,348	1,512,985	524,348	$ 520,682
U.S. [Member]
Segment Reporting Information [Line Items]
Net sales	1,404,617	849,226	2,480,879	1,809,461
Long-lived assets	1,499,860	511,507	1,499,860	511,507	507,236
Canada [Member]
Segment Reporting Information [Line Items]
Net sales	21,008	21,498	66,725	63,447
Long-lived assets	$ 13,125	$ 12,841	$ 13,125	$ 12,841	$ 13,446

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail) - Fair Value, Inputs, Level 2 [Member] $ in Millions	6 Months Ended
	Mar. 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 2023 [Member] | Carrying Value [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Senior notes	$ 300
Senior Notes Due in 2023 [Member] | Fair Value [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Senior notes	$ 317
Senior Notes Due in 2025 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Debt instrument maturity year	2,025
Senior Notes Due in 2025 [Member] | Carrying Value [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Senior notes	$ 1,300
Senior Notes Due in 2025 [Member] | Fair Value [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Senior notes	$ 1,240

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Provisional expense for one-time transition tax liability	$ 0.9	$ 0.9
Provisional income tax benefit	$ 1.5	$ 48.9
Scenario, Forecast [Member]
Blended federal corporate income tax rate				24.50%
Federal corporate income tax rate			21.00%

Supplemental Guarantor Inform58

Supplemental Guarantor Information - Condensed Consolidating Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016
Current assets:
Cash and cash equivalents	$ 16,000	$ 138,250	$ 10,012	$ 31,386
Accounts receivable, net	832,823	704,527	506,386
Inventories, net	1,005,577	551,924	580,889
Prepaid expenses and other current assets	240,315	209,138	217,389
Total current assets	2,094,715	1,603,839	1,314,676
Intercompany receivable, net	0	0	0
Investments in consolidated subsidiaries	0	0	0
Deferred income taxes, net	0	0	0
Property and equipment, net	294,222	156,129	156,380
Goodwill	2,381,620	1,251,986	1,228,059	1,197,565
Intangibles, net	1,410,302	429,069	439,507
Other assets, net	1,511	8,534	1,511
Total Assets	6,182,370	3,449,557	3,140,133
Current liabilities:
Accounts payable	593,559	503,697	486,328
Accrued expenses	348,050	261,297	131,264
Current portions of long-term debt	19,597	14,141	14,014
Total current liabilities	961,206	779,135	631,606
Intercompany payable, net	0	0	0
Borrowings under revolving lines of credit, net	424,528	3,205	269,124
Long-term debt, net	2,493,889	721,268	722,101
Deferred income taxes, net	91,101	138,383	137,495
Long-term obligations under equipment financing and other, net	18,313	23,213	28,267
Other long-term liabilities	10,617	2,547	2,372
Total liabilities	3,999,654	1,667,751	1,790,965
Convertible preferred stock	399,195
Total stockholders' equity	1,783,521	1,781,806	1,349,168
Total Liabilities and Stockholders' Equity	6,182,370	3,449,557	3,140,133
Parent Company [Member]
Current assets:
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0	0
Inventories, net	0	0	0
Prepaid expenses and other current assets	35,646	4,195	28,952
Total current assets	35,646	4,195	28,952
Intercompany receivable, net	0	0	0
Investments in consolidated subsidiaries	5,949,437	3,160,273	2,959,542
Deferred income taxes, net	19,902	30,822	57,419
Property and equipment, net	10,761	6,610	5,614
Goodwill	0	0	0
Intangibles, net	0	0	0
Other assets, net	1,243	2,912	1,242
Total Assets	6,016,989	3,204,812	3,052,769
Current liabilities:
Accounts payable	21,042	27,174	27,209
Accrued expenses	61,788	51,183	26,226
Current portions of long-term debt	9,700	4,500	4,500
Total current liabilities	92,530	82,857	57,935
Intercompany payable, net	1,247,040	618,881	923,565
Borrowings under revolving lines of credit, net	0	0	0
Long-term debt, net	2,493,889	721,268	722,101
Deferred income taxes, net	0	0	0
Long-term obligations under equipment financing and other, net	0	0	0
Other long-term liabilities	814	0	0
Total liabilities	3,834,273	1,423,006	1,703,601
Convertible preferred stock	399,195
Total stockholders' equity	1,783,521	1,781,806	1,349,168
Total Liabilities and Stockholders' Equity	6,016,989	3,204,812	3,052,769
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	18,746	149,799	24,181	37,447
Accounts receivable, net	816,058	663,034	490,724
Inventories, net	978,852	527,226	556,463
Prepaid expenses and other current assets	199,947	198,817	184,764
Total current assets	2,013,603	1,538,876	1,256,132
Intercompany receivable, net	1,284,455	655,372	961,450
Investments in consolidated subsidiaries	0	0	0
Deferred income taxes, net	0	0	0
Property and equipment, net	272,866	138,955	140,918
Goodwill	2,351,447	1,220,812	1,198,805
Intangibles, net	1,407,772	426,187	436,513
Other assets, net	268	5,622	269
Total Assets	7,330,411	3,985,824	3,994,087
Current liabilities:
Accounts payable	572,222	468,891	468,144
Accrued expenses	281,265	204,173	103,045
Current portions of long-term debt	9,897	9,641	9,514
Total current liabilities	863,384	682,705	580,703
Intercompany payable, net	0	0	0
Borrowings under revolving lines of credit, net	424,528	0	269,124
Long-term debt, net	0	0	0
Deferred income taxes, net	110,614	168,209	194,556
Long-term obligations under equipment financing and other, net	18,313	23,147	28,221
Other long-term liabilities	9,729	2,547	2,372
Total liabilities	1,426,568	876,608	1,074,976
Convertible preferred stock	0
Total stockholders' equity	5,903,843	3,109,216	2,919,111
Total Liabilities and Stockholders' Equity	7,330,411	3,985,824	3,994,087
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	8,196	1,582	1,946	2,876
Accounts receivable, net	17,905	42,633	15,437
Inventories, net	26,725	24,698	24,426
Prepaid expenses and other current assets	4,722	6,126	3,673
Total current assets	57,548	75,039	45,482
Intercompany receivable, net	0	0	0
Investments in consolidated subsidiaries	0	0	0
Deferred income taxes, net	0	0	0
Property and equipment, net	10,595	10,564	9,848
Goodwill	30,173	31,174	29,254
Intangibles, net	2,530	2,882	2,994
Other assets, net	0	0	0
Total Assets	100,846	119,659	87,578
Current liabilities:
Accounts payable	12,377	21,903	6,865
Accrued expenses	4,997	5,941	1,993
Current portions of long-term debt	0	0	0
Total current liabilities	17,374	27,844	8,858
Intercompany payable, net	37,415	36,491	37,885
Borrowings under revolving lines of credit, net	0	3,205	0
Long-term debt, net	0	0	0
Deferred income taxes, net	389	996	358
Long-term obligations under equipment financing and other, net	0	66	46
Other long-term liabilities	74	0	0
Total liabilities	55,252	68,602	47,147
Convertible preferred stock	0
Total stockholders' equity	45,594	51,057	40,431
Total Liabilities and Stockholders' Equity	100,846	119,659	87,578
Eliminations and Other [Member]
Current assets:
Cash and cash equivalents	(10,942)	(13,131)	(16,115)	$ (8,937)
Accounts receivable, net	(1,140)	(1,140)	225
Inventories, net	0	0	0
Prepaid expenses and other current assets	0	0	0
Total current assets	(12,082)	(14,271)	(15,890)
Intercompany receivable, net	(1,284,455)	(655,372)	(961,450)
Investments in consolidated subsidiaries	(5,949,437)	(3,160,273)	(2,959,542)
Deferred income taxes, net	(19,902)	(30,822)	(57,419)
Property and equipment, net	0	0	0
Goodwill	0	0	0
Intangibles, net	0	0	0
Other assets, net	0	0	0
Total Assets	(7,265,876)	(3,860,738)	(3,994,301)
Current liabilities:
Accounts payable	(12,082)	(14,271)	(15,890)
Accrued expenses	0	0	0
Current portions of long-term debt	0	0	0
Total current liabilities	(12,082)	(14,271)	(15,890)
Intercompany payable, net	(1,284,455)	(655,372)	(961,450)
Borrowings under revolving lines of credit, net	0	0	0
Long-term debt, net	0	0	0
Deferred income taxes, net	(19,902)	(30,822)	(57,419)
Long-term obligations under equipment financing and other, net	0	0	0
Other long-term liabilities	0	0	0
Total liabilities	(1,316,439)	(700,465)	(1,034,759)
Convertible preferred stock	0
Total stockholders' equity	(5,949,437)	(3,160,273)	(2,959,542)
Total Liabilities and Stockholders' Equity	$ (7,265,876)	$ (3,860,738)	$ (3,994,301)

Supplemental Guarantor Inform59

Supplemental Guarantor Information - Condensed Consolidating Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Net sales	$ 1,425,625	$ 870,724	$ 2,547,604	$ 1,872,908
Cost of products sold	1,087,248	666,247	1,939,474	1,417,364
Gross profit	338,377	204,477	608,130	455,544
Operating expense	395,775	207,533	616,432	411,643
Intercompany charges (income)	0	0	0	0
Income (loss) from operations	(57,398)	(3,056)	(8,302)	43,901
Interest income (expense), financing costs, and other	39,570	12,268	62,138	25,842
Intercompany interest expense (income)	0	0	0	0
Income (loss) before provision for income taxes	(96,968)	(15,324)	(70,440)	18,059
Provision for (benefit from) income taxes	(30,313)	(5,968)	(71,381)	6,985
Income (loss) before equity in net income of subsidiaries	(66,655)	(9,356)	941	11,074
Equity in net income of subsidiaries	0	0	0	0
Net income (loss)	(66,655)	(9,356)	941	11,074
Parent Company [Member]
Net sales	0	0	0	0
Cost of products sold	0	0	0	0
Gross profit	0	0	0	0
Operating expense	3,115	7,010	3,438	15,656
Intercompany charges (income)	(1,477)	(12,555)	(584)	(24,508)
Income (loss) from operations	(1,638)	5,545	(2,854)	8,852
Interest income (expense), financing costs, and other	47,220	3,983	57,296	19,337
Intercompany interest expense (income)	(5,181)	(5,089)	(10,889)	(10,682)
Income (loss) before provision for income taxes	(43,677)	6,651	(49,261)	197
Provision for (benefit from) income taxes	(10,469)	2,444	(4,948)	(410)
Income (loss) before equity in net income of subsidiaries	(33,208)	4,207	(44,313)	607
Equity in net income of subsidiaries	(33,447)	(13,563)	45,254	10,467
Net income (loss)	(66,655)	(9,356)	941	11,074
Guarantor Subsidiaries [Member]
Net sales	1,404,617	849,226	2,480,879	1,809,461
Cost of products sold	1,070,605	649,595	1,887,041	1,368,129
Gross profit	334,012	199,631	593,838	441,332
Operating expense	384,245	193,448	595,000	380,521
Intercompany charges (income)	1,477	11,993	584	23,392
Income (loss) from operations	(51,710)	(5,810)	(1,746)	37,419
Interest income (expense), financing costs, and other	3,807	8,003	4,632	5,458
Intercompany interest expense (income)	4,804	5,089	10,125	10,682
Income (loss) before provision for income taxes	(60,321)	(18,902)	(16,503)	21,279
Provision for (benefit from) income taxes	(18,575)	(7,568)	(65,247)	8,334
Income (loss) before equity in net income of subsidiaries	(41,746)	(11,334)	48,744	12,945
Equity in net income of subsidiaries	0	0	0	0
Net income (loss)	(41,746)	(11,334)	48,744	12,945
Non-Guarantor Subsidiaries [Member]
Net sales	21,008	21,498	66,725	63,447
Cost of products sold	16,643	16,652	52,433	49,235
Gross profit	4,365	4,846	14,292	14,212
Operating expense	8,415	7,075	17,994	15,466
Intercompany charges (income)	0	562	0	1,116
Income (loss) from operations	(4,050)	(2,791)	(3,702)	(2,370)
Interest income (expense), financing costs, and other	(11,457)	282	210	1,047
Intercompany interest expense (income)	377	0	764	0
Income (loss) before provision for income taxes	7,030	(3,073)	(4,676)	(3,417)
Provision for (benefit from) income taxes	(1,269)	(844)	(1,186)	(939)
Income (loss) before equity in net income of subsidiaries	8,299	(2,229)	(3,490)	(2,478)
Equity in net income of subsidiaries	0	0	0	0
Net income (loss)	8,299	(2,229)	(3,490)	(2,478)
Eliminations and Other [Member]
Net sales	0	0	0	0
Cost of products sold	0	0	0	0
Gross profit	0	0	0	0
Operating expense	0	0	0	0
Intercompany charges (income)	0	0	0	0
Income (loss) from operations	0	0	0	0
Interest income (expense), financing costs, and other	0	0	0	0
Intercompany interest expense (income)	0	0	0	0
Income (loss) before provision for income taxes	0	0	0	0
Provision for (benefit from) income taxes	0	0	0	0
Income (loss) before equity in net income of subsidiaries	0	0	0	0
Equity in net income of subsidiaries	33,447	13,563	(45,254)	(10,467)
Net income (loss)	$ 33,447	$ 13,563	$ (45,254)	$ (10,467)

Supplemental Guarantor Inform60

Supplemental Guarantor Information - Condensed Consolidating Statements of Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Net income (loss)	$ (66,655)	$ (9,356)	$ 941	$ 11,074
Other comprehensive income (loss):
Foreign currency translation adjustment	(2,028)	813	(1,971)	(839)
Total other comprehensive income (loss)	(2,028)	813	(1,971)	(839)
Comprehensive income (loss)	(68,683)	(8,543)	(1,030)	10,235
Parent Company [Member]
Net income (loss)	(66,655)	(9,356)	941	11,074
Other comprehensive income (loss):
Foreign currency translation adjustment	(2,028)	813	(1,971)	(839)
Total other comprehensive income (loss)	(2,028)	813	(1,971)	(839)
Comprehensive income (loss)	(68,683)	(8,543)	(1,030)	10,235
Guarantor Subsidiaries [Member]
Net income (loss)	(41,746)	(11,334)	48,744	12,945
Other comprehensive income (loss):
Foreign currency translation adjustment	0	0	0	0
Total other comprehensive income (loss)	0	0	0	0
Comprehensive income (loss)	(41,746)	(11,334)	48,744	12,945
Non-Guarantor Subsidiaries [Member]
Net income (loss)	8,299	(2,229)	(3,490)	(2,478)
Other comprehensive income (loss):
Foreign currency translation adjustment	(2,028)	813	(1,971)	(839)
Total other comprehensive income (loss)	(2,028)	813	(1,971)	(839)
Comprehensive income (loss)	6,271	(1,416)	(5,461)	(3,317)
Eliminations and Other [Member]
Net income (loss)	33,447	13,563	(45,254)	(10,467)
Other comprehensive income (loss):
Foreign currency translation adjustment	2,028	(813)	1,971	839
Total other comprehensive income (loss)	2,028	(813)	1,971	839
Comprehensive income (loss)	$ 35,475	$ 12,750	$ (43,283)	$ (9,628)

Supplemental Guarantor Inform61

Supplemental Guarantor Information - Condensed Consolidating Statements of Cash Flows (Detail) - USD ($) $ in Thousands	Jan. 02, 2018	Mar. 31, 2018	Mar. 31, 2017
Net cash provided by (used in) operating activities		$ 39,966	$ 150,530
Investing Activities
Purchases of property and equipment		(24,833)	(24,231)
Acquisition of businesses, net		(2,726,561)	(58,359)
Proceeds from the sale of assets		413	1,285
Intercompany activity		0	0
Net cash provided by (used in) investing activities		(2,750,981)	(81,305)
Financing Activities
Borrowings under revolving lines of credit		1,530,667	857,099
Repayments under revolving lines of credit		(1,097,463)	(948,470)
Borrowings under term loan		970,000	0
Repayments under term loan		(441,000)	(1,125)
Repayments under equipment financing facilities and other		(5,643)	(5,365)
Borrowings under senior notes		1,300,000	0
Payment of debt issuance costs	$ (67,700)	(67,723)	0
Proceeds from issuance of convertible preferred stock		400,000	0
Payment of stock issuance costs		(1,279)	0
Payment of dividends on preferred stock		(978)	0
Proceeds from issuance of common stock related to equity awards		5,317	7,840
Taxes paid related to net share settlement of equity awards		(3,933)	(697)
Intercompany activity		0	0
Net cash provided by (used in) financing activities		2,587,965	(90,718)
Effect of exchange rate changes on cash and cash equivalents		800	119
Net increase (decrease) in cash and cash equivalents		(122,250)	(21,374)
Effect of exchange rate changes on cash and cash equivalents		800	119
Net increase (decrease) in cash and cash equivalents		(122,250)	(21,374)
Cash and cash equivalents, beginning of period		138,250	31,386
Cash and cash equivalents, end of period		16,000	10,012
Parent Company [Member]
Net cash provided by (used in) operating activities		(47,488)	(29,347)
Investing Activities
Purchases of property and equipment		(5,050)	(1,709)
Acquisition of businesses, net		(2,726,561)	(58,359)
Proceeds from the sale of assets		0	0
Intercompany activity		606,865	83,397
Net cash provided by (used in) investing activities		(2,124,746)	23,329
Financing Activities
Borrowings under revolving lines of credit		0	0
Repayments under revolving lines of credit		0	0
Borrowings under term loan		970,000
Repayments under term loan		(441,000)	(1,125)
Repayments under equipment financing facilities and other		0	0
Borrowings under senior notes		1,300,000
Payment of debt issuance costs		(55,893)
Proceeds from issuance of convertible preferred stock		400,000
Payment of stock issuance costs		(1,279)
Payment of dividends on preferred stock		(978)
Proceeds from issuance of common stock related to equity awards		5,317	7,840
Taxes paid related to net share settlement of equity awards		(3,933)	(697)
Intercompany activity		0	0
Net cash provided by (used in) financing activities		2,172,234	6,018
Effect of exchange rate changes on cash and cash equivalents		0	0
Net increase (decrease) in cash and cash equivalents		0	0
Effect of exchange rate changes on cash and cash equivalents		0	0
Net increase (decrease) in cash and cash equivalents		0	0
Cash and cash equivalents, beginning of period		0	0
Cash and cash equivalents, end of period		0	0
Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities		77,948	181,934
Investing Activities
Purchases of property and equipment		(18,524)	(21,742)
Acquisition of businesses, net		0	0
Proceeds from the sale of assets		398	1,274
Intercompany activity		0	0
Net cash provided by (used in) investing activities		(18,126)	(20,468)
Financing Activities
Borrowings under revolving lines of credit		1,514,102	852,583
Repayments under revolving lines of credit		(1,077,744)	(939,438)
Borrowings under term loan		0
Repayments under term loan		0	0
Repayments under equipment financing facilities and other		(5,643)	(5,365)
Borrowings under senior notes		0
Payment of debt issuance costs		(11,830)
Proceeds from issuance of convertible preferred stock		0
Payment of stock issuance costs		0
Payment of dividends on preferred 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		(609,760)	(82,512)
Net cash provided by (used in) financing activities		(190,875)	(174,732)
Effect of exchange rate changes on cash and cash equivalents		0	0
Net increase (decrease) in cash and cash equivalents		(131,053)	(13,266)
Effect of exchange rate changes on cash and cash equivalents		0	0
Net increase (decrease) in cash and cash equivalents		(131,053)	(13,266)
Cash and cash equivalents, beginning of period		149,799	37,447
Cash and cash equivalents, end of period		18,746	24,181
Non-Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities		9,289	5,121
Investing Activities
Purchases of property and equipment		(1,259)	(780)
Acquisition of businesses, net		0	0
Proceeds from the sale of assets		15	11
Intercompany activity		0	0
Net cash provided by (used in) investing activities		(1,244)	(769)
Financing Activities
Borrowings under revolving lines of credit		16,565	4,516
Repayments under revolving lines of credit		(19,719)	(9,032)
Borrowings under term loan		0
Repayments under term loan		0	0
Repayments under equipment financing facilities and other		0	0
Borrowings under senior notes		0
Payment of debt issuance costs		0
Proceeds from issuance of convertible preferred stock		0
Payment of stock issuance costs		0
Payment of dividends on preferred 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		923	(885)
Net cash provided by (used in) financing activities		(2,231)	(5,401)
Effect of exchange rate changes on cash and cash equivalents		800	119
Net increase (decrease) in cash and cash equivalents		6,614	(930)
Effect of exchange rate changes on cash and cash equivalents		800	119
Net increase (decrease) in cash and cash equivalents		6,614	(930)
Cash and cash equivalents, beginning of period		1,582	2,876
Cash and cash equivalents, end of period		8,196	1,946
Eliminations and Other [Member]
Net cash provided by (used in) operating activities		217	(7,178)
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		(606,865)	(83,397)
Net cash provided by (used in) investing activities		(606,865)	(83,397)
Financing Activities
Borrowings under revolving lines of credit		0	0
Repayments under revolving lines of credit		0	0
Borrowings under term loan		0
Repayments under term loan		0	0
Repayments under equipment financing facilities and other		0	0
Borrowings under senior notes		0
Payment of debt issuance costs		0
Proceeds from issuance of convertible preferred stock		0
Payment of stock issuance costs		0
Payment of dividends on preferred 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		608,837	83,397
Net cash provided by (used in) financing activities		608,837	83,397
Effect of exchange rate changes on cash and cash equivalents		0	0
Net increase (decrease) in cash and cash equivalents		2,189	(7,178)
Effect of exchange rate changes on cash and cash equivalents		0	0
Net increase (decrease) in cash and cash equivalents		2,189	(7,178)
Cash and cash equivalents, beginning of period		(13,131)	(8,937)
Cash and cash equivalents, end of period		$ (10,942)	$ (16,115)