GMS (GMS) 10-Q 5 Mar 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Jan. 31, 2019	Feb. 28, 2019
Document and Entity Information
Entity Registrant Name	GMS Inc.
Entity Central Index Key	1,600,438
Document Type	10-Q
Document Period End Date	Jan. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--04-30
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		40,571,969
Document Fiscal Year Focus	2,019
Document Fiscal Period Focus	Q3

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jan. 31, 2019	Apr. 30, 2018
Current assets:
Cash and cash equivalents	$ 74,347	$ 36,437
Trade accounts and notes receivable, net of allowances of $7,963 and $9,633, respectively	410,017	346,450
Inventories, net	308,115	239,223
Prepaid expenses and other current assets	12,610	11,726
Total current assets	805,089	633,836
Property and equipment, net of accumulated depreciation of $113,898 and $85,761, respectively	280,225	163,582
Goodwill	619,554	427,645
Intangible assets, net	452,811	222,682
Deferred income tax assets, net	5,219
Other assets	14,250	6,766
Total assets	2,177,148	1,454,511
Current liabilities:
Accounts payable	129,580	116,168
Accrued compensation and employee benefits	52,454	56,323
Other accrued expenses and current liabilities	60,488	45,146
Current portion of long-term debt	40,328	16,284
Total current liabilities	282,850	233,921
Non-current liabilities:
Long-term debt, less current portion	1,193,522	579,602
Deferred income taxes, net	9,743	10,742
Other liabilities	46,148	35,088
Liabilities to noncontrolling interest holders, less current portion	11,125	15,707
Total liabilities	1,543,388	875,060
Commitments and contingencies
Stockholders' equity
Common stock, par value $0.01 per share, 500,000 shares authorized; 40,561 and 41,069 shares issued and outstanding as of January 31, 2019 and April 30, 2018, respectively	406	411
Preferred stock, par value $0.01 per share, 50,000 shares authorized; 0 shares issued and outstanding as of January 31, 2019 and April 30, 2018
Exchangeable shares	29,639
Additional paid-in capital	482,635	489,007
Retained earnings	128,969	89,592
Accumulated other comprehensive income (loss)	(7,889)	441
Total stockholders' equity	633,760	579,451
Total liabilities and stockholders’ equity	$ 2,177,148	$ 1,454,511

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jan. 31, 2019	Apr. 30, 2018
Condensed Consolidated Balance Sheets
Trade accounts and notes receivable, allowances (in dollars)	$ 7,963	$ 9,633
Property and equipment, accumulated depreciation (in dollars)	$ 113,898	$ 85,761
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	500,000	500,000
Common stock, shares issued	40,561	41,069
Common stock, shares outstanding	40,561	41,069
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000	50,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Condensed Consolidated Statements of Operations and Comprehensive Income
Net sales	$ 723,902	$ 585,508	$ 2,335,883	$ 1,875,669
Cost of sales (exclusive of depreciation and amortization shown separately below)	489,676	390,088	1,588,691	1,262,885
Gross profit	234,226	195,420	747,192	612,784
Operating expenses:
Selling, general and administrative	178,180	156,262	548,883	472,232
Depreciation and amortization	30,220	16,490	87,329	49,548
Total operating expenses	208,400	172,752	636,212	521,780
Operating income	25,826	22,668	110,980	91,004
Other (expense) income:
Interest expense	(19,526)	(7,871)	(54,896)	(23,288)
Change in fair value of financial instruments		(276)	(6,395)	(710)
Write-off of debt discount and deferred financing fees				(74)
Other income, net	957	677	2,025	1,675
Total other expense, net	(18,569)	(7,470)	(59,266)	(22,397)
Income before taxes	7,257	15,198	51,714	68,607
Provision (benefit) for income taxes	1,442	(4,488)	12,337	15,555
Net income	$ 5,815	$ 19,686	$ 39,377	$ 53,052
Weighted average common shares outstanding:
Basic (in shares)	40,912	41,036	41,053	41,004
Diluted (in shares)	41,371	42,228	41,789	42,167
Net income per common share:
Basic (in dollars per share)	$ 0.14	$ 0.48	$ 0.94	$ 1.29
Diluted (in dollars per share)	$ 0.14	$ 0.47	$ 0.92	$ 1.26
Comprehensive income
Net income	$ 5,815	$ 19,686	$ 39,377	$ 53,052
Foreign currency translation loss	(128)		(8,821)
Changes in other comprehensive income, net of tax		401	491	797
Comprehensive income	$ 5,687	$ 20,087	$ 31,047	$ 53,849

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Stockholders’ Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Exchangeable Shares	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Apr. 30, 2017	$ 410		$ 488,459	$ 26,621	$ (884)	$ 514,606
Balance (in shares) at Apr. 30, 2017	40,971
Increase (Decrease) in Stockholders' Equity
Net income				53,052		53,052
Change in other comprehensive income (loss), net of tax					797	797
Equity-based compensation			1,141			1,141
Tax withholding related to net share settlements of equity awards / stock options			(1,441)			(1,441)
Exercise of stock options			130			130
Exercise of stock options (in shares)	70
Balance at Jan. 31, 2018	$ 410		488,289	79,673	(87)	568,285
Balance (in shares) at Jan. 31, 2018	41,041
Balance at Apr. 30, 2018	$ 411		489,007	89,592	441	$ 579,451
Balance (in shares) at Apr. 30, 2018	41,069					41,069
Increase (Decrease) in Stockholders' Equity
Net income				39,377		$ 39,377
Issuance of Exchangeable Shares						29,639
Issuance of Exchangeable Shares (in shares)		29,639
Repurchase and retirement of common stock	$ (7)		(11,507)			(11,514)
Repurchase and retirement of common stock (in shares)	(691)
Foreign currency translation adjustments					(8,821)	(8,821)
Change in other comprehensive income (loss), net of tax					491	491
Equity-based compensation			2,502			2,502
Tax withholding related to net share settlements of equity awards / stock options			(51)			(51)
Exercise of stock options	$ 1		1,280			1,281
Exercise of stock options (in shares)	103
Vesting of restricted stock units (in shares)	5
Issuance of common stock pursuant to employee stock purchase plan	$ 1		1,404			1,405
Issuance of common stock pursuant to employee stock purchase plan (in shares)	75
Balance at Jan. 31, 2019	$ 406		$ 482,635	$ 128,969	$ (7,889)	$ 633,760
Balance (in shares) at Jan. 31, 2019	40,561	29,639				40,561

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Cash flows from operating activities:
Net income	$ 39,377	$ 53,052
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	87,329	49,548
Write-off and amortization of debt discount and debt issuance costs	2,505	2,141
Provision for losses on accounts and notes receivable	240	133
Provision for obsolescence of inventory	416	113
Effects of fair value adjustments to inventory	4,129	276
Increase in fair value of contingent consideration	535	195
Equity-based compensation	4,706	4,375
Gain on sale and disposal of assets	(412)	(648)
Change in fair value of financial instruments	6,395	710
Changes in assets and liabilities net of effects of acquisitions:
Trade accounts and notes receivable	23,243	14,545
Inventories	(11,576)	(23,893)
Prepaid expenses and other assets	(968)	(8,756)
Accounts payable	(17,856)	(5,723)
Accrued compensation and employee benefits	(3,824)	(7,140)
Derivative liability	(10,778)
Other accrued expenses and liabilities	446	312
Deferred income taxes	(18,470)	(12,860)
Cash provided by operating activities	105,437	66,380
Cash flows from investing activities:
Purchases of property and equipment	(13,385)	(13,408)
Proceeds from sale of assets	910	2,374
Acquisition of businesses, net of cash acquired	(579,731)	(23,568)
Cash used in investing activities	(592,206)	(34,602)
Cash flows from financing activities:
Repayments on the revolving credit facility	(748,999)	(597,092)
Borrowings from the revolving credit facility	886,896	493,739
Payments of principal on long-term debt	(7,476)	(4,332)
Payments of principal on capital lease obligations	(13,923)	(4,530)
Borrowings from term loan	996,840	577,616
Repayments of term loan	(571,840)	(477,616)
Repurchases of common stock	(11,514)
Debt issuance costs	(7,933)	(3,283)
Proceeds from exercises of stock options	1,280	130
Other financing activities	1,355	(2,032)
Cash provided by (used in) financing activities	524,686	(17,400)
Effect of exchange rates on cash and cash equivalents	(7)
Increase in cash and cash equivalents	37,910	14,378
Cash and cash equivalents, beginning of period	36,437	14,561
Cash and cash equivalents, end of period	74,347	28,939
Supplemental cash flow disclosures:
Cash paid for income taxes	16,121	35,005
Cash paid for interest	45,724	21,192
Supplemental schedule of noncash activities:
Assets acquired under capital lease	102,053	7,953
Issuance of installment notes associated with equity-based compensation liability awards	$ 5,356	$ 11,898

Business, Basis of Presentation

Business, Basis of Presentation and Summary of Significant Accounting Policies	9 Months Ended
	Jan. 31, 2019
Business, Basis of Presentation and Summary of Significant Accounting Policies
Business, Basis of Presentation and Summary of Significant Accounting Policies	1. Business, Basis of Presentation and Summary of Significant Accounting Policies Business Founded in 1971, GMS Inc. (“we,” “our,” “us,” or the “Company”), through its wholly-owned operating subsidiaries, is a distributor of specialty building products including wallboard, suspended ceilings systems, or ceilings, steel framing and other complementary specialty building products. We purchase products from a large number of manufacturers and then distribute these goods to a customer base consisting of wallboard and ceilings contractors and homebuilders and, to a lesser extent, general contractors and individuals. We operate a network of more than 245 distribution centers across the United States and Canada. Basis of Presentation The condensed consolidated financial statements included in this Quarterly Report on Form 10‑Q have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) that permit reduced disclosure for interim periods. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all normal and recurring adjustments necessary for a fair presentation of the results of operations, financial position and cash flows. All adjustments are of a normal recurring nature unless otherwise disclosed. The results of operations for interim periods are not necessarily indicative of results for any other interim period or the entire fiscal year . As a result, the unaudited condensed consolidated financial statements should be read in conjunction with our audited consolidated financial statements included in our Annual Report on Form 10‑K for the fiscal year ended April 30, 2018. Principles of Consolidation The condensed consolidated financial statements present the results of operations, financial position and cash flows of the Company and its subsidiaries. All material intercompany balances and transactions have been eliminated in consolidation. The results of operations of businesses acquired are included from their respective dates of acquisition. Use of Estimates The preparation of financial statements in conformity with Generally Accepted Accounting Principles (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Foreign Currency Translation Assets and liabilities of the Company’s Canadian subsidiaries are translated at the exchange rate prevailing at the balance sheet date, while income and expenses are translated at average rates for the period. Translation gains and losses are reported as a separate component of stockholders’ equity and other comprehensive income. Gains and losses on foreign currency transactions are recognized in the Condensed Consolidated Statements of Operations and Comprehensive Income within other income, net. Insurance Liabilities The Company is self‑insured for certain losses related to medical claims. The Company has stop‑loss coverage to limit the exposure arising from medical claims. The Company has deductible‑based insurance policies for certain losses related to general liability, automobile and workers’ compensation. The deductible amount per incident is $0.3 million, $0.5 million and $1.0 million for general liability, workers’ compensation and automobile, respectively. The coverage consists of a primary layer and an excess layer. The primary layer of coverage is from $0.5 million to $2.0 million and the excess layer cover claims from $2.0 million to $100.0 million. The expected ultimate cost for claims incurred as of the balance sheet date is not discounted and is recognized as a liability. Insurance losses for claims filed and claims incurred but not reported are accrued based upon estimates of the aggregate liability for uninsured claims using loss development factors, actuarial assumptions and historical loss development experience. As of January 31, 2019 and April 30, 2018, the aggregate liabilities for medical self‑insurance were $3.7 million and $4.1 million, respectively, and are included in other accrued expenses and current liabilities in the Condensed Consolidated Balance Sheets. As of January 31, 2019 and April 30, 2018, reserves for general liability, automobile and workers’ compensation totaled approximately $14.2 million and $14.7 million, respectively, and are included in other accrued expenses and current liabilities and other liabilities in the Condensed Consolidated Balance Sheets. As of January 31, 2019 and April 30, 2018, expected recoveries for medical self‑insurance, general liability, automobile and workers’ compensation totaled approximately $4.2 million and $4.8 million, respectively, and are included in prepaid expenses and other current assets and other assets in the Condensed Consolidated Balance Sheets. Restructuring The Company recognizes a liability for costs associated with an exit or disposal activity when the liability is incurred. After the appropriate level of management approves the detailed restructuring plan and the appropriate criteria for recognition are met, the Company establishes accruals for employee termination and other costs, as applicable. During the nine months ended January 31, 2019, the Company initiated a reduction in workforce as part of a strategic cost reduction plan to improve operational efficiency. The Company recorded $5.2 million of restructuring costs during the nine months ended January 31, 2019 in connection with the reduction in workforce and certain other restructuring activities, consisting primarily of severance and other employee costs. Such costs are classified within selling, general and administrative expenses in the Condensed Consolidated Statements of Operations and Comprehensive Income. The Company made payments of $4.6 million during the nine months ended January 31, 2019. As of January 31, 2019, the Company had a remaining liability of $0.6 million, which was classified within other accrued expenses and current liabilities in the Condensed Consolidated Balance Sheet. Income Taxes The Company considers each interim period an integral part of the annual period and measures tax expense (benefit) using an estimated annual effective income tax rate. Estimates of the annual effective income tax rate at the end of interim periods are, out of necessity, based on evaluation of possible future events and transactions and may be subject to subsequent refinement or revision. The Company forecasts its estimated annual effective income tax rate and then applies that rate to its year‑to‑date pre‑tax ordinary income (loss), subject to certain loss limitation provisions. In addition, certain specific transactions are excluded from the Company’s estimated annual effective tax rate computation, but are discretely recognized within income tax expense (benefit) in their respective interim period. Future changes in the forecasted annual income (loss) projections, tax rate changes, or discrete tax items could result in significant adjustments to quarterly income tax expense (benefit) in future periods. The Company evaluates its deferred tax assets quarterly to determine if valuation allowances are required. In this evaluation, the Company considers both positive and negative evidence in determining whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The primary negative evidence considered includes the cumulative operating losses generated in prior periods. The primary positive evidence considered includes the reversal of deferred tax liabilities primarily related to depreciation and amortization that would occur within the same jurisdiction and during the carryforward period necessary to absorb the federal and state net operating losses and other deferred tax assets. Deferred tax assets and liabilities are computed by applying the federal and state income tax rates in effect to the gross amounts of temporary differences and other tax attributes, such as net operating loss carry‑forwards. In assessing if the deferred tax assets will be realized, the Company considers whether it is more likely than not that some or all of these deferred tax assets will be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the period in which these deductible temporary differences reverse. Fair Value of Financial Instruments Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Authoritative guidance for fair value measurements establishes a three‑level hierarchy that prioritizes the inputs to valuation models based upon the degree to which they are observable. The three levels of the fair value measurement hierarchy are as follows: Level 1 Inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date. Level 2 Inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. Level 3 Inputs are unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions. The carrying values of the Company’s cash, cash equivalents, trade receivables and trade payables approximate their fair values because of their short‑term nature. Based on borrowing rates available to the Company for loans with similar terms, the carrying values of the Company’s debt instruments approximate fair value. See Note 10, “Fair Value Measurements,” for additional information with respect to the Company’s fair value measurements. Earnings Per Share Basic earnings per share is computed by dividing net income available to common stockholders by the weighted average number of outstanding shares of common stock for the period. Diluted earnings per share reflects the potential dilution that could occur if securities or other contracts to issue common stock, including stock options and restricted stock units (collectively “Common Stock Equivalents”), were exercised or converted into common stock . The dilutive effect of outstanding stock options and restricted stock units is reflected in diluted earnings per share by application of the treasury stock method. In applying the treasury stock method for stock-based compensation arrangements, the assumed proceeds are computed as the sum of the amount the employee must pay upon exercise and the amount of compensation cost attributed to future services and not yet recognized. Diluted earnings per share is computed by increasing the weighted‑average number of outstanding shares of common stock computed in basic earnings per share to include the dilutive effect of Common Stock Equivalents for the period. In periods of net loss, the number of shares used to calculate diluted loss per share is the same as basic net loss per share. The holders of the Company’s Exchangeable Shares (as defined in Note 3, “Business Acquisitions” and further described in Note 7, “Stockholders’ Equity”) are entitled to receive dividends or distributions that are equal to any dividends or distributions on the Company’s common stock. As a result, the Exchangeable Shares are classified as a participating security and thereby require the allocation of income that would have otherwise been available to common stockholders when calculating earnings per share. Diluted earnings per share is calculated by utilizing the most dilutive result of the if-converted and two-class methods. In both methods, net income attributable to common stockholders and the weighted-average common shares outstanding are adjusted to account for the impact of the assumed issuance of potential common shares that are dilutive, subject to dilution sequencing rules. Recently Adopted Accounting Pronouncements Revenue recognition — In May 2014, the Financial Accounting Standards Board (the “FASB”) issued authoritative guidance on revenue from contracts with customers. The new guidance supersedes most existing revenue recognition guidance and outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The core principle of the revenue model is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The new standard also requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers . In August 2015, the FASB issued guidance that deferred the effective date by one year. The standard is required to be adopted by public business entities in annual periods beginning on or after December 15, 2017, and interim periods within those annual periods, and may be applied on a full retrospective or modified retrospective approach. Early adoption at the original effective date is permitted. The Company adopted this guidance on May 1, 2018 (the first day of fiscal 2019) using the modified retrospective approach. The adoption of the new guidance, using the modified retrospective approach, did not have a material impact on the Company’s financial statements. The adoption of the new guidance resulted in a $3.6 million reclassification in the Condensed Consolidated Balance Sheet from trade accounts and notes receivable to other accrued expenses and current liabilities for estimated sales returns. The adoption of the new revenue guidance also resulted in additional disclosures regarding the Company’s revenue recognition. The additional disclosures required by this new standard are contained in Note 2, “Revenue.” Statement of Cash Flows – In August 2016, the FASB issued new guidance to reduce diversity in practice related to certain cash receipts and payment in the statement of cash flows by adding or clarifying guidance on eight specific cash flow issues. The new guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017 . The Company adopted this guidance on May 1, 2018. As a result of the adoption, the Company now classifies cash payments for debt prepayment or debt extinguishment costs, including third-party costs and other fees paid to lenders that are directly related to the debt prepayment or debt extinguishment, as cash outflows for financing activities. This resulted in a $2.7 million reclass from cash (used in) provided by operating activities (specifically the line item changes in other accrued expenses and current liabilities) to cash provided by financing activities (specifically the line item debt issuance costs) in the Condensed Consolidated Statement of Cash Flows for the nine months ended January 31, 2019 . The adoption did not have any other material impact on the Company’s financial statements. Income Taxes – In October 2016, the FASB issued new guidance intended to improve the accounting for intra-entity transfers of assets other than inventory by requiring recognition of income tax consequences when such a transfer occurs. The new guidance is effective for annual and interim periods beginning after December 15, 2017. Early adoption is permitted. The amendments in this update should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Company adopted this guidance on May 1, 2018 with no material impact on its financial statements. Derivatives – In August 2017, the FASB issued new guidance on accounting for hedging activities, which expands and refines hedge accounting for both non-financial and financial risk components and aligns the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. The new guidance is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years . The Company adopted this guidance on November 1, 2018 with no material impact on its financial statements. Recently Issued Accounting Pronouncements Leases —In February 2016, the FASB issued authoritative guidance on accounting for leases. The new standard establishes a right-of-use (ROU) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than twelve months. Leases will be classified as either finance or operating, with such classification affecting the pattern of expense recognition in the statement of operations. The new standard is effective for the Company’s fiscal year beginning May 1, 2019 (the first day of fiscal 2020), including interim reporting periods within that fiscal year. A modified transition approach is required for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. On July 30, 2018, the FASB issued new guidance that provides entities with an additional (and optional) transition method to adopt the new lease standard. Under this new transition method, an entity initially applies the new lease standard at the adoption date and recognizes a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. We have not yet determined whether we will use the newly permitted adoption method. While the Company is still evaluating the impact of its pending adoption of the new standard on its financial statements, the Company expects that the adoption will result in a material increase in the assets and liabilities recorded on our Condensed Consolidated Balance Sheets and additional qualitative and quantitative disclosures . We are continuing to evaluate the method of adoption and c urrently finalizing our accounting policies, implementing a new leasing system, determining changes needed in current processes for lease accounting and verifying the completeness of our lease population and, thus, we are unable to quantify the financial statement impact at this time. Goodwill – In January 2017, the FASB issued authoritative guidance that simplifies the accounting for goodwill impairments by eliminating Step 2 from the goodwill impairment test . Under the new guidance, goodwill impairment will be the amount by which a reporting unit’s carrying value exceeds its fair value. The new standard is effective for annual and any interim impairment tests for periods beginning after December 15, 2019. Early adoption is permitted. The Company does not expect the adoption of this standard to have a material impact on its financial statements. Accumulated Other Comprehensive Income – In February 2018, the FASB issued authoritative guidance which permits entities to reclassify, to retained earnings, the one-time income tax effects stranded in accumulated other comprehensive income arising from the change in the U.S. federal corporate tax rate as a result of the Tax Cuts and Jobs Act of 2017. An entity that elects to make this reclassification must consider all items in accumulated other comprehensive income that have tax effects stranded as a result of the tax rate change, and must disclose the reclassification of these tax effects as well as the entity’s policy for releasing income tax effects from accumulated other comprehensive income. The new guidance may be applied either retrospectively or as of the beginning of the period of adoption. The new guidance is effective for fiscal years beginning after December 15, 2018 , including interim periods within those fiscal years . Early adoption is permitted. The Company plans to adopt this guidance on May 1, 2019 (the first day of fiscal 2020). While this guidance will have no impact on the Company’s results of operations, the Company is currently assessing this standard’s impact on its consolidated financial position. Cloud Computing Costs – In August 2018, the FASB issued new guidance that clarifies the accounting treatment for implementation costs for cloud computing arrangements (hosting arrangements) that is a service contract. This guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within that fiscal year. Early adoption is permitted. The Company is currently assessing the effect that this new guidance will have on its financial position, results of operations and disclosures. Fair Value Measurement Disclosures – In August 2018, the FASB issued new guidance that changes certain fair value measurement disclosure requirements . This guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. An entity is permitted to early adopt all of the disclosure changes or early adopt only the removed disclosure requirements and delay adoption of the additional disclosures until the effective date of this amendment. Except for changes to certain disclosures related to fair value measurements, the Company does not expect the adoption of this standard to have a material impact on its financial statements.

Revenue

Revenue	9 Months Ended
	Jan. 31, 2019
Revenue
Revenue	2. Revenue Revenue Recognition Revenue is recognized upon transfer of control of promised goods to customers at an amount that reflects the consideration the Company expects to receive in exchange for those goods. Revenue is recognized net of any taxes collected from customers, which are subsequently remitted to governmental authorities. The Company includes shipping and handling costs billed to customers in net sales. These costs are recognized as a component of selling, general and administrative expenses when the Company does not bill the customer. See Note 13, “Segments,” for information regarding disaggregation of revenue, including revenue by product and by geographic area. Performance Obligations The Company primarily satisfies its performance obligations at a point in time, which is upon delivery of products. The Company’s payment terms vary by the type and location of its customers. The amount of time between point of sale and when payment is due is not significant and the Company has determined its contracts do not include a significant financing component. Product warranties do not constitute a performance obligation for the Company, as products are warrantied directly by the manufacturer. Our contracts with customers involve performance obligations that are one year or less. Therefore, we applied the standard’s optional exemption that permits the omission of information about our unfulfilled performance obligations as of the balance sheet dates. Significant Judgements The Company’s contracts may include terms that could cause variability in the transaction price, including customer rebates, returns and cash discounts for early payment. Variable consideration is estimated and included in total consideration based on the expected value method. These estimates are based on historical experience, anticipated performance and other factors known at the time. The Company only includes estimated amounts in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Contract Balances Receivables from contracts with customers were $389.4 million and $326.6 million as of January 31, 2019 and May 1, 2018, respectively. The Company did not have material amounts of contract assets or liabilities as of January 31, 2019 or May 1, 2018.

Business Acquisitions

Business Acquisitions	9 Months Ended
	Jan. 31, 2019
Business Acquisitions
Business Acquisitions	3. Business Acquisitions The Company accounts for business combinations by recognizing the assets acquired and liabilities assumed at the acquisition date fair value. In valuing acquired assets and liabilities, fair value estimates use Level 3 inputs, including future expected cash flows and discount rates. Goodwill is measured as the excess of consideration transferred over the fair values of the assets acquired and the liabilities assumed. While the Company uses its best estimates and assumptions as a part of the purchase price allocation process to accurately value assets acquired and liabilities assumed at the acquisition date, the Company’s estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, the Company records adjustments to the assets acquired and liabilities assumed, with the corresponding offset to goodwill. Upon the conclusion of the measurement period, any subsequent adjustments arising from new facts and circumstances are recorded to the Condensed Consolidated Statements of Operations and Comprehensive Income. The results of operations of acquisitions are reflected in the Company’s Condensed Consolidated Financial Statements from the date of acquisition. Acquisition of Titan On June 1, 2018, the Company acquired all of the outstanding equity interests of WSB Titan (“Titan”) , a distributer of wallboard, lumber, and other commercial and residential building materials. Titan is a gypsum specialty dealer with 30 locations across five provinces in Canada. T he stated purchase price was $627.0 million ($800.0 million Canadian dollars), subject to a working capital and certain other adjustments as set forth in the securities purchase agreement. As part of the consideration, certain members of Titan’s management converted a portion of their ownership position into 1.1 million shares of equity that are exchangeable for the Company’s common stock (“Exchangeable Shares”). The purpose of the transaction was to extend the Company’s leadership position in North America with expanded scale and footprint, expand its geographic coverage into the Canadian market and create opportunities for further expansion in Canada. To finance this transaction, on June 1, 2018, the Company entered into a Third Amendment to its First Lien Credit Agreement (the “Third Amendment”) that provides for a new first lien term loan facility under the first lien credit agreement in the aggregate principal amount of $996.8 million due in June 2025 that bears interest at a floating rate based on LIBOR , with a 0% floor, plus 2.75%. The Company also drew down $143.0 million under its Asset Backed Lending Facility (“ABL Facility”) . The net proceeds from the new first lien term loan facility, ABL Facility and cash on hand were used to repay the Company’s existing first lien term loan facility of $571.8 million under the Credit Agreement and to finance its acquisition of Titan . The fair value of consideration transferred was $611.1 million, after adjusting for foreign currency changes in the stated purchase price and other fair value changes, which consisted of $581.5 million in cash and $29.6 million for the fair value of the 1.1 million Exchangeable Shares . See Note 7, “Stockholders’ Equity,” for more information on the Exchangeable Shares. The Company also assumed certain contingent consideration arrangements that relate to previous acquisitions of Titan. The contingent consideration arrangements are based on performance of Titan’s business and are payable in cash in fiscal 2019 and fiscal 2020. The assets acquired and liabilities assumed of Titan were recognized at their acquisition date fair values. The purchase price allocation is subject to change as the Company obtains additional information during the measurement period about the facts and circumstances that existed as of the acquisition date. During the three months ended January 31, 2019, the Company received and analyzed new information about the fair value of consideration transferred, intangible assets and deferred income taxes as of the June 1, 2018 acquisition date and subsequently made adjustments to those amounts based on this information. The primary areas of the preliminary purchase price allocation that are not yet finalized relate to the finalization of preliminary fair value estimates, income taxes and residual goodwill. The following table summarizes the preliminary allocation of the consideration transferred, and subsequent measurement period purchase price adjustments recorded, based on currently available information (in thousands): As Previously Reported October 31, 2018 Adjustments January 31, 2019 Cash $ 5,573 $ — $ 5,573 Trade accounts and notes receivable 84,039 970 85,009 Inventories 60,272 — 60,272 Prepaid and other current assets 8,334 — 8,334 Property and equipment 37,263 — 37,263 Goodwill 196,969 (3,171) 193,798 Intangible assets 289,423 (2,469) 286,954 Accounts payable and accrued expenses (40,833) (970) (41,803) Contingent consideration (12,039) — (12,039) Deferred income taxes (14,337) 2,085 (12,252) Fair value of consideration transferred $ 614,664 $ (3,555) $ 611,109 Goodwill arising from the acquisition is attributable to synergies achieved through the streamlining of operations combined with improved margins attainable through increased market presence. All of the goodwill will be assigned to the Company’s geographic divisions segment. The goodwill is not expected to be deductible for income tax purposes. Trade accounts and notes receivable had a preliminary estimate of fair value of $85.0 million and a gross contractual value of $86.6 million. The difference represents the Company’s best estimate of the contractual cash flows that will not be collected. The following table summarizes the preliminary components of intangible assets acquired in connection with the acquisition of Titan (dollars in thousands): Weighted Average Amortization Fair Value Period (Years) Customer relationships $ 246,954 15 Tradenames 30,870 15 Developed technology 5,402 5 Non-compete agreements 2,856 3 Other 872 3 Total intangible assets $ 286,954 Net sales related to the Titan business included in the Company’s Condensed Consolidated Statement of Operations and Comprehensive Income for the nine months ended January 31, 2019 was $314.1 million. Net income related to the Titan business included in the Company’s Condensed Consolidated Statement of Operations and Comprehensive Income for the nine months ended January 31, 2019 was $8.7 million. The following table represents the unaudited pro forma consolidated net sales and net income for the Company for the periods indicated (in thousands): Three Months Ended Nine Months Ended January 31, January 31, 2019 2018 2019 2018 Net sales $ 723,902 $ 693,205 $ 2,381,039 $ 2,238,185 Net income 5,815 16,513 35,894 54,188 The above pro forma results have been calculated by combining the historical results of the Company and Titan as if the acquisition of Titan had occurred on May 1, 2017, the first day of the comparable prior reporting period presented. 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 each of the periods presented or that may be achieved in the future. Other Acquisitions On August 7, 2018, the Company acquired Charles G. Hardy, Inc. (“CGH”). CGH is an interior building products distributor in Paramount, California. The impact of this acquisition is not material to the Company’s Consolidated Financial Statements.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Jan. 31, 2019
Goodwill and Intangible Assets
Goodwill and Intangible Assets	4. Goodwill and Intangible Assets Goodwill The following table presents changes in the carrying amount of goodwill during the nine months ended January 31, 2019: Carrying Amount (in thousands) Balance as of April 30, 2018 $ 427,645 Goodwill acquired 194,436 Purchase price adjustments from prior periods 8 Translation adjustment (2,535) Balance as of January 31, 2019 $ 619,554 Intangible Assets The following tables present the components of the Company’s definite-lived intangible assets as of January 31, 2019 and April 30, 2018: Estimated Weighted January 31, 2019 Useful Average Gross Net Lives Amortization Carrying Accumulated Carrying (years) Period Amount Amortization Value (dollars in thousands) Customer relationships 5 - 16 12.9 $ 526,120 $ 198,642 $ 327,478 Definite-lived tradenames 5 - 20 16.3 56,695 6,128 50,567 Vendor agreements 8 - 10 8.3 6,644 3,560 3,084 Developed technology 5 4.9 5,328 723 4,605 Leasehold interests 1 - 15 7.6 3,726 1,319 2,407 Other 3 - 5 3.4 4,181 878 3,303 Totals $ 602,694 $ 211,250 $ 391,444 Estimated Weighted April 30, 2018 Useful Average Gross Net Lives Amortization Carrying Accumulated Carrying (years) Period Amount Amortization Value (dollars in thousands) Customer relationships 5 - 13 10.9 $ 282,547 $ 150,081 $ 132,466 Definite-lived tradenames 5 - 20 18.0 26,250 3,578 22,672 Vendor agreement 8 - 10 8.3 6,644 2,956 3,688 Leasehold interests 7 - 15 9.0 2,866 832 2,034 Other 5 5.0 521 66 455 Totals $ 318,828 $ 157,513 $ 161,315 Definite-lived intangible assets are amortized over their estimated useful lives. The Company amortizes its customer relationships using an accelerated method to match the estimated cash flows generated by such assets, and amortizes its other definite-lived intangibles using the straight-line method because a pattern to which the expected benefits will be consumed or otherwise used up could not be reliably determined. Amortization expense related to definite-lived intangible assets was $18.3 million and $10.5 million for the three months ended January 31, 2019 and 2018, respectively, and $53.3 million and $31.5 million for the nine months ended January 31, 2019 and 2018, respectively. Amortization expense is recorded in depreciation and amortization expense in the Condensed Consolidated Statements of Operations and Comprehensive Income. Based on the current amount of definite-lived intangible assets, the Company expects to record amortization expense of approximately $17.7 million during the remaining three months in the year ending April 30, 2019 and $64.4 million, $54.6 million, $45.7 million, $38.1 million and $170.9 million during the years ending April 30, 2020, 2021, 2022, 2023 and thereafter, respectively. Actual amortization expense to be reported in future periods could differ materially from these estimates as a result of acquisitions, changes in useful lives, foreign currency exchange rate fluctuations and other relevant factors. The Company’s indefinite-lived intangible assets consist of tradenames that had a carrying amount of $61.4 million as of January 31, 2019 and April 30, 2018.

Long-Term Debt

Long-Term Debt	9 Months Ended
	Jan. 31, 2019
Long-Term Debt
Long-Term Debt	5. Long-Term Debt The Company’s long‑term debt consisted of the following as of January 31, 2019 and April 30, 2018: January 31, April 30, 2019 2018 (in thousands) First Lien Term Loan (1) (2) $ 974,555 $ 563,179 ABL Facility 137,898 — Capital lease obligations 105,489 18,564 Installment notes at fixed rates up to 5.0%, due in monthly and annual installments through 2023 (3) 15,908 14,143 Carrying value of debt 1,233,850 595,886 Less current portion 40,328 16,284 Long-term debt $ 1,193,522 $ 579,602 (1) Net of unamortized discount of $2,238 and $2,536 as of January 31, 2019 and April 30, 2018, respectively. (2) Net of deferred financing costs of $12,570 and $6,125 as of January 31, 2019 and April 30, 2018, respectively. (3) Net of unamortized discount of $1,273 and $1,534 as of January 31, 2019 and April 30, 2018, respectively. First Lien Term Loan The Company has a senior secured first lien term loan facility (the "First Lien Facility") that consists of a First Lien Term Loan (the "First Term Loan"). On June 7, 2017, the Company entered into the Second Amendment to First Lien Credit Agreement, dated April 1, 2014 (the “First Lien Credit Agreement”) (the “Second Amendment”), which amended the First Lien Credit Agreement (as previously amended and as supplemented from time to time). The Second Amendment provided for a new first lien term loan facility under the First Lien Credit Agreement in the aggregate principal amount of approximately $577.6 million due on April 1, 2023 that bears interest at a floating rate based on LIBOR plus 3.00%, with a 1.00% floor. Net proceeds were used to repay the outstanding balance of approximately $477.6 million under the existing First Lien Loan and approximately $94.0 million of loans under the Company’s asset based revolving credit facility as well as to pay related expenses. The Company recorded a write-off of debt discount and deferred financing fees of $0.1 million, which is included in write-off of discount and deferred financing fees in the Condensed Consolidated Statements of Operations and Comprehensive Income for the nine months ended January 31, 2018. On June 1, 2018, the Company entered into the Third Amendment that provided for a new first lien term loan facility under the First Lien Credit Agreement in the aggregate principal amount of $996.8 million due in June 2025 that bears interest at a floating rate based on LIBOR plus 2.75%, with a 0% floor . The net proceeds from the new first lien term loan facility were used to repay the Company’s existing First Lien Loan outstanding balance of approximately $571.8 million and to finance the acquisition of Titan. As of January 31, 2019, the applicable rate of interest was 5 .25 %. Asset Based Lending Facility The Company has an asset based revolving credit facility (the “ABL Facility”) that provides for aggregate revolving commitments of $345.0 million (including same day swing line borrowings of $34.5 million). GYP Holdings III Corp. is the lead borrower. Extensions of credit under the ABL Facility are limited by a borrowing base calculated periodically based on specified percentages of the value of eligible inventory and eligible accounts receivable, subject to certain reserves and other adjustments. At the Company’s option, the interest rates applicable to the loans under the ABL Facility are based at LIBOR or base rate plus, in each case, an applicable margin. The margins applicable for each elected interest rate are subject to a pricing grid, as defined in the ABL Facility agreement, based on average daily availability for the most recent fiscal quarter. As of January 31, 2019, the applicable rate of interest was 4.01%. The ABL Facility also contains an unused commitment fee subject to utilization, as included in the ABL Facility agreement. During the nine months ended January 31, 2019, the Company made net borrowings under the ABL facility of $137.9 million. As of January 31, 2019, the Company had available borrowing capacity of approximately $197.3 million under the ABL Facility. The ABL Facility will mature on November 18, 2021 unless the individual affected lenders agree to extend the maturity of their respective loans under the ABL Facility upon the Company’s request and without the consent of any other lender. The ABL Facility contains a cross default provision with the First Lien Facility. Covenants under the ABL Facility and First Lien Facility The First Lien Facility contains a number of covenants that limit our ability and the ability of our restricted subsidiaries, as described in the First Lien Credit Agreement, to: incur more indebtedness; pay dividends, redeem stock or make other distributions; make investments; create restrictions on the ability of our restricted subsidiaries to pay dividends to us or make other intercompany transfers; create liens securing indebtedness; transfer or sell assets; merge or consolidate; enter into certain transactions with our affiliates; and prepay or amend the terms of certain indebtedness. The Company was in compliance with all restrictive covenants as of January 31, 2019. The ABL Facility contains certain affirmative covenants, including financial and other reporting requirements. The Company was in compliance with all such covenants as of January 31, 2019. Titan Revolving Credit Facility In connection with the acquisition of Titan on June 1, 2018, the Company assumed Titan’s revolving credit facility (the “Titan Facility”) that provides for aggregate revolving commitments of $22.5 million ($30.0 million Canadian dollars), as amended. The Titan Facility bears interest at the Canadian prime rate plus a marginal rate based on the level determined by Titan’s total debt to EBITDA ratio at the end of the most recently completed fiscal quarter or year. As of January 31, 2019, no amounts were outstanding under the Titan Facility and the Company had available borrowing capacity of approximately $22.5 million under the Titan Facility. The Titan Facility matures on June 28, 2022. Capital Leases During the nine months ended January 31, 2019, the Company amended certain terms of its operating lease agreements for equipment. The amendments would have resulted in capital lease classification of the leases under lease classification criteria had the changed terms been in effect at lease inception. As such, the amended agreements were considered new agreements. The new lease agreements were classified as capital leases as of the date of the modifications based on the application of lease classification criteria. As a result, the Company recorded $73.6 million of capital lease assets and capital lease obligations in its Condensed Consolidated Balance Sheet during the nine months ended January 31, 2019 . Debt Maturities As of January 31, 2019, the maturities of long‑term debt were as follows First Lien ABL Capital Installment Term Loan(1) Facility Leases Notes(2) Total Years ending April 30, (in thousands) 2019 (remaining three months) $ 2,491 $ — $ 5,693 $ 604 $ 8,788 2020 9,968 — 26,343 4,363 40,674 2021 9,968 — 25,039 4,053 39,060 2022 9,968 137,898 21,430 3,617 172,913 2023 9,968 — 16,019 3,584 29,571 Thereafter 947,000 — 10,965 960 958,925 $ 989,363 $ 137,898 $ 105,489 $ 17,181 $ 1,249,931 (1) Gross of unamortized discount of $2,238 and deferred financing costs of $12,570 as of January 31, 2019. (2) Gross of unamortized discount of $1,273 as of January 31, 2019.

Income Taxes

Income Taxes	9 Months Ended
	Jan. 31, 2019
Income Taxes
Income Taxes	6. Income Taxes The Company’s effective income tax rate on continuing operations for the nine months ended January 31, 2019 was 23.9% compared to an effective income tax rate of 22.7% for the nine months ended January 31, 2018. The increase in the effective income tax rate was primarily due to the impact of the Tax Cuts and Jobs Act of 2017 (the “Tax Act”) and the impact of foreign tax rates and other tax effects associated with the acquisition of Titan. The U.S. federal statutory rate is 21.0% . Tax Cuts and Jobs Act . On December 22, 2017, the Tax Act was signed into law. The Tax Act includes a number of provisions, including the lowering of the U.S. corporate income tax rate from 35% to 21% effective January 1, 2018. In connection with the Tax Act, the SEC issued Staff Accounting Bulletin No. 118 (“SAB 118”) to provide guidance to companies that had not completed their accounting for the income tax effects of the Tax Act. Under SAB 118, provisional amounts could be recorded to the extent a reasonable estimate could be made. Additional tax effects and adjustments to previously recorded provisional amounts could be recorded upon obtaining, preparing, or analyzing additional information (including computations) within one year from the enactment date of the Tax Act. As of January 31, 2018, the Company was still assessing the overall impact of the Tax Act on its financial statements and had not completed its accounting for the tax effects of the Tax Act. As of January 31, 2018, the Company reported provisional amounts reflecting reasonable estimates for the re-measurement of net deferred tax liabilities due to the reduction in the corporate rate. The Company recorded a provisional income tax benefit of $7.8 million for this re-measurement during the three and nine months ended January 31, 2018, which was included in provision for income taxes in the Condensed Consolidated Statements of Operations and Comprehensive Income. As of January 31, 2019, the Company completed its analysis to determine the effects of the Tax Act. As a result, the Company recorded a $0.1 million income tax benefit during the nine months ended January 31, 2019 related to tax adjustments made in accordance with SAB 118 with respect to the adjustment of its original provisional estimate of the impact of the Tax Act. Due to the acquisition of Titan, the Company is now subject to provisions of the Tax Act related to current tax on global intangible low-taxed income (“GILTI”) earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740 No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred. We have elected to recognize the tax on GILTI as a period expense in the period the tax is incurred. In general, it is the practice and intention of the Company to reinvest the accumulated earnings of its non-U.S. subsidiaries in those operations. Foreign withholding taxes have not been recognized on the excess of the amount for financial reporting over the tax basis of investments in foreign subsidiaries that is indefinitely reinvested outside the United States. Valuation allowance . The Company also had a valuation allowance of $0.4 million against its deferred tax assets related to certain U.S. tax jurisdictions as of January 31, 2019 and April 30, 2018. To the extent the Company generates sufficient taxable income in the future to utilize the tax benefits of the net deferred tax assets on which a valuation allowance is recorded, the effective tax rate may decrease as the valuation allowance is reversed. Uncertain tax positions . The Company had no reserve for uncertain tax positions as of January 31, 2019 and April 30, 2018.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Jan. 31, 2019
Stockholders’ Equity
Stockholders’ Equity	7. Stockholders’ Equity Exchangeable Shares In connection with the acquisition of Titan on June 1, 2018, the Company issued 1.1 million Exchangeable Shares. The Exchangeable Shares were issued by an indirect wholly-owned subsidiary of the Company. The Exchangeable Shares rank senior to the Company’s common stock with respect to dividend rights and rights on liquidation, dissolution and winding-up. The holders of the Exchangeable Shares are entitled to receive dividends or distributions that are equal to any dividends or distributions on the Company’s common stock. The holders of the Exchangeable Shares do not have voting rights. The Exchangeable Shares contain rights that allow the holders to exchange their Exchangeable Shares for GMS common stock at any time on a one-for-one basis. If converted, the holders are prevented from transferring such GMS common stock for one year from the Titan acquisition date. The Exchangeable Shares also contain rights that allow the Company, through its indirect wholly-owned subsidiary, to convert the Exchangeable Shares into GMS common stock on or after the fifth anniversary of the initial issuance of the Exchangeable Shares or upon certain events, as defined in the agreement. Share Repurchase Program On November 30, 2018, the Company’s Board of Directors authorized a common stock repurchase program to repurchase up to $75.0 million outstanding common stock. The Company may conduct repurchases under the share repurchase program through open market transactions, under trading plans in accordance with SEC Rule 10b5-1 and/or in privately negotiated transactions, in compliance with Rule 10b-18 under the Exchange Act of 1934, as amended, subject to a variety of factors, including, but not limited to, our liquidity, credit availability, general business and market conditions, our debt covenant restrictions and the availability of alternative investment opportunities. The share repurchase program does not obligate us to acquire any particular amount of common stock, and it may be suspended or terminated at any time at the Company’s discretion. The Company repurchased 0.7 million shares of its common stock for $11.5 million during the nine months ended January 31, 2019 pursuant to its share repurchase program. The repurchased common stock was retired. As of January 31, 2019, the Company had $63.5 million remaining under its repurchase program . Accumulated Other Comprehensive Income (Loss) The following table sets forth the changes to accumulated other comprehensive income (loss), net of tax, by component for the nine months ended January 31, 2019: Accumulated Other Comprehensive Income (Loss) (in thousands) Accumulated other comprehensive income as of April 30, 2018 $ 441 Foreign currency translation adjustments (8,821) Other comprehensive loss on interest rate cap (237) Reclassification to earnings from accumulated other comprehensive income for interest rate cap 728 Accumulated other comprehensive loss as of January 31, 2019 $ (7,889)

Equity-Based Compensation

Equity-Based Compensation	9 Months Ended
	Jan. 31, 2019
Equity-Based Compensation
Equity-Based Compensation	8. Equity-Based Compensation General The Company measures compensation cost for all share‑based awards at fair value on the grant date (or measurement date if different) and recognizes compensation expense, net of estimated forfeitures, over the requisite service period for awards expected to vest. The Company estimates the fair value of stock options using the Black-Scholes valuation model, and determines the fair value of restricted stock units based on the quoted price of GMS’s common stock on the date of grant . The Company estimates forfeitures based on historical analysis of actual forfeitures and employee turnover. Actual forfeitures are recorded when incurred and estimated forfeitures are reviewed and adjusted at least annually. Equity-based compensation expense related to stock options and restricted stock units was $2.6 million and $1.3 million during the nine months ended January 31, 2019 and 2018, respectively, and is included in selling, general and administrative expenses in the Condensed Consolidated Statements of Operations and Comprehensive Income. Stock Option Awards The following table presents stock option activity for the nine months ended January 31, 2019: Weighted Weighted Average Average Remaining Aggregate Number of Exercise Contractual Intrinsic Options Price Life (years) Value (shares and dollars in thousands) Outstanding as of April 30, 2018 1,952 $ 14.37 6.52 $ 33,209 Options granted 374 25.58 Options exercised (103) 12.41 Options forfeited (41) 27.00 Options expired — — Outstanding as of January 31, 2019 2,182 $ 16.15 6.35 $ 10,261 Exercisable as of January 31, 2019 1,724 $ 13.51 5.63 $ 10,217 Vested and expected to vest as of January 31, 2019 2,173 $ 16.10 6.34 $ 10,260 The aggregate intrinsic value represents the value of the Company’s closing stock price on the last trading day of the period in excess of the weighted average exercise price multiplied by the number of options outstanding, exercisable or expected to vest. Options expected to vest are unvested shares net of expected forfeitures. The total intrinsic value of options exercised during the nine months ended January 31, 2019 and 2018 was $0.8 million and $3.7 million, respectively. As of January 31, 2019 , there was $3.2 million of total unrecognized compensation cost related to stock options. That cost is expected to be recognized over a weighted-average period of 2.3 years. There were no stock options granted during the nine months ended January 31, 2018. The fair value of stock options granted during the nine months ended January 31, 2019 was estimated using the Black-Scholes option-pricing model with the following assumptions: Nine Months Ended January 31, 2019 Volatility 33.71 % Expected life (years) Risk-free interest rate 2.87 % Dividend yield — % The weighted average grant date fair value of options granted during the nine months ended January 31, 2019 was $9.72 per share. The expected volatility was based on the average volatility of peer public entities that are similar in size and industry because prior to our IPO we did not have sufficient history to estimate the expected volatility of our common stock price. The expected life of stock options was based on previous history of exercises. The risk‑free rate was based on the U.S. Treasury yield curve in effect at the time of grant for the expected term of the stock option. The expected dividend yield was 0% as we have not declared any common stock dividends to date and do not expect to declare common stock dividends in the near future. The fair value of the underlying common stock at the date of grant was determined based on the value of the Company’s closing stock price on the trading day immediately preceding the date of the grant. Restricted Stock Units The following table presents restricted stock unit activity for the nine months ended January 31, 2019: Weighted Number of Average Restricted Exercise Stock Units Price (shares in thousands) Outstanding as of April 30, 2018 22 $ 37.49 Granted 188 24.87 Vested (7) 37.49 Forfeited (15) 26.41 Outstanding as of January 31, 2019 188 $ 25.72 As of January 31, 2019, there was $3.7 million of total unrecognized compensation cost related to nonvested restricted stock units. That cost is expected to be recognized over a weighted-average period of 2.1 years.

Stock Appreciation Rights, Defe

Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests	9 Months Ended
	Jan. 31, 2019
Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests
Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests	9. Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests The following table presents a summary of changes to the liabilities for stock appreciation rights, deferred compensation and redeemable noncontrolling interests for the nine months ended January 31, 2019: Stock Redeemable Appreciation Deferred Noncontrolling Rights Compensation Interests (in thousands) Balance as of April 30, 2018 $ 21,944 $ 2,222 $ 16,170 Amounts redeemed (1,216) (715) (4,673) Change in fair value 1,426 118 661 Balance as of January 31, 2019 $ 22,154 $ 1,625 $ 12,158 Classified as current as of April 30, 2018 $ 308 $ 133 $ 463 Classified as long-term as of April 30, 2018 21,636 2,089 15,707 Classified as current as of January 31, 2019 $ 981 $ — $ 1,034 Classified as long-term as of January 31, 2019 21,173 1,625 11,124 Total expense related to these instruments was $2.2 million and $3.2 million during the nine months ended January 31, 2019 and 2018, respectively, and was included in selling, general and administrative expenses in the Condensed Consolidated Statements of Operations and Comprehensive Income. Stock Appreciation Rights Certain subsidiaries have granted stock appreciation rights to certain employees under which payments are dependent on the appreciation in the book value per share, adjusted for certain provisions, of the applicable subsidiary. Settlements of the awards can be made in a combination of cash or installment notes, generally paid over four years, upon a triggering event. As of January 31, 2019, all stock appreciation rights were vested. Deferred Compensation Subsidiaries’ stockholders have entered into other deferred compensation agreements that granted the stockholders a payment based on a percentage in excess of book value, adjusted for certain provisions, upon an occurrence as defined in the related agreements, which are called “Buy Sell” agreements. These instruments are redeemed in cash or installment notes, generally paid in annual installments over the five years following termination of employment. Redeemable Noncontrolling Interests Noncontrolling interests were issued to certain employees of the subsidiaries. All of the noncontrolling interest awards are subject to mandatory redemption on termination of employment for any reason. These instruments are redeemed in cash or installment notes, generally paid in annual installments over the five years following termination of employment. Liabilities related to these agreements are classified as share-based liability awards and are measured at intrinsic value. Intrinsic value is determined to be the stated redemption value of the shares. Under the terms of the employee agreements, the redemption value is determined based on the book value of the subsidiary, as adjusted for certain items. Upon the termination of employment or other triggering events including death or disability of the noncontrolling stockholders in the Company’s subsidiaries, we are obligated to purchase, or redeem, the noncontrolling interests at either an agreed upon price or a formula value provided in the stockholder agreements. This formula value is typically based on the book value per share of the subsidiary’s equity, including certain adjustments.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Jan. 31, 2019
Fair Value Measurements
Fair Value Measurements	10. Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis The following table presents the estimated carrying amount and fair value of the Company’s assets and liabilities measured at fair value on a recurring basis as of January 31, 2019 and April 30, 2018: January 31, April 30, 2019 2018 (in thousands) Assets: Interest rate cap (Level 2) $ — $ 543 Liabilities: Forward currency forward (Level 2) $ — $ 5,108 Stock appreciation rights (Level 3) 22,154 21,944 Deferred compensation (Level 3) 1,625 2,222 Noncontrolling interest holders (Level 3) 12,158 16,170 Contingent consideration (Level 3) 12,406 — Derivative instruments . The fair value of derivative instruments is determined using Level 2 inputs. Generally, the Company obtains the Level 2 inputs from its counterparties. Substantially all of the inputs are observable in the marketplace throughout the full term of the instruments, which can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace. The fair value of the Company’s interest rate cap was determined using widely accepted valuation techniques including a discounted cash flow analysis on the expected cash flows of the derivative. This analysis reflected the contractual terms of the derivatives, including the period to maturity, and used observable market‑based inputs, including interest rate curves and implied volatilities. T he Company’s interest rate cap expired on October 31, 2018. The fair value of the Company’s forward currency forward contract was based on observable market inputs, such as forward rates in active markets. During the nine months ended January 31, 2019, the Company recognized a $5.7 million loss on the change in fair value of its foreign currency forward contract, which was settled upon the acquisition on Titan. The loss is included within change in fair value of financial instruments in the Condensed Consolidated Statement of Operations and Comprehensive Income. Stock appreciation rights, deferred compensation and redeemable noncontrolling interests . The fair values of stock appreciation rights, deferred compensation and redeemable noncontrolling interests are determined using Level 3 inputs. These inputs include a volatility rate based on comparable entities, a discount rate, the expected time to redemption of the liabilities, historical values of the book equity of certain subsidiaries and market information for comparable entities. The use of these inputs to derive the fair value of the liabilities at a point in time can result in volatility to the financial statements. See Note 9, “Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests,” for a reconciliation of the beginning and ending balances. Contingent consideration . The fair value of contingent consideration is determined using Level 3 inputs. These inputs include a discount rate and probability adjusted payments. In connection with the acquisition of Titan, the Company assumed certain contingent consideration arrangements that have an estimated fair value of $12.4 million. During the nine months ended January 31, 2019, the Company recorded expense of $0.5 million related to the contingent consideration, which was included in selling, general and administrative expenses in the Condensed Consolidated Statement of Operations and Comprehensive Income. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Disclosures are required for certain assets and liabilities that are measured at fair value on a nonrecurring basis in periods subsequent to initial recognition. Such measurements of fair value relate primarily to assets and liabilities measured at fair value in connection with business combinations and long-lived asset impairments. For more information on business combinations, see Note 3, “Business Acquisitions.” There were no material long-lived asset impairments during the nine months ended January 31, 2019 or 2018.

Transactions With Related Parti

Transactions With Related Parties	9 Months Ended
	Jan. 31, 2019
Transactions With Related Parties
Transactions With Related Parties	11. Transactions With Related Parties The Company leases office and warehouse facilities from partnerships or entities owned by certain executive officers and stockholders of GMS Inc. and its subsidiaries. As of January 31, 2019, these leases had expiration dates through fiscal 2025. Rent expense related to these leases was $0.2 million and $0.2 million for the three months ended January 31, 2019 and 2018, respectively, and $0.6 million and $0.6 million for the nine months ended January 31, 2019 and 2018, respectively. Rent expense related to these leases is included in selling, general and administrative expenses in the Condensed Consolidated Statements of Operations and Comprehensive Income. The Company purchases inventories from Southern Wall Products, Inc. (“SWP”) on a continuing basis. Certain executive officers and stockholders of the Company are stockholders of SWP, which was spun‑off from Gypsum Management and Supply, Inc. on August 31, 2012. The Company purchased inventory from SWP for distribution in the amount of $3.0 million and $3.3 million during the three months ended January 31, 2019 and 2018, respectively, and $10.0 million and $10.5 million during the nine months ended January 31, 2019 and 2018, respectively. Amounts due to SWP for purchases of inventory for distribution were $1.0 million and $1.2 million as of January 31, 2019 and April 30, 2018, respectively, and are included in accounts payable in the Condensed Consolidated Balance Sheets.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Jan. 31, 2019
Commitments and Contingencies
Commitments and Contingencies	12. Commitments and Contingencies The Company is a defendant in various lawsuits and administrative actions associated with personal injuries, claims of former employees, and other events arising in the normal course of business. As discussed in Note 1 “—Insurance Liabilities”, the Company records liabilities for these claims, and assets for amounts recoverable from the insurer, for these claims covered by insurance.

Segments

Segments	9 Months Ended
	Jan. 31, 2019
Segments
Segments	13. Segments General The Company has seven operating segments based on geographic operations that it aggregates into one reportable segment. The Company defines operating segments as components of the organization for which discrete financial information is available and operating results are evaluated on a regular basis by the Chief Operating Decision Maker (“CODM”) in order to assess performance and allocate resources. The Company’s CODM is its Chief Executive Officer. The Company determined it has seven operating segments based on the Company’s seven geographic divisions, which are Central, Midwest, Northeast, Southern, Southeast, Western and Canada. On June 1, 2018, the Company acquired Titan, which resulted in the addition of a new operating segment. The Company aggregates its operating segments into a single reportable segment based on similarities between the operating segments’ economic characteristics, nature of products sold, production process, type of customer and methods of distribution. The accounting policies of the operating segments are the same as those described in the summary of significant policies. In addition to the Company’s reportable segment, the Company’s consolidated results include both corporate activities and certain other activities. Corporate includes the Company’s corporate office building and support services provided to its subsidiaries. Other includes Tool Source Warehouse, Inc., which functions primarily as an internal distributor of tools. Segment Results The CODM assesses the Company’s performance based on the periodic review of net sales, Adjusted EBITDA and certain other measures for each of the operating segments. Adjusted EBITDA is not a recognized financial measure under GAAP. However, we believe it assists investors and analysts in comparing our operating performance across reporting periods on a consistent basis by excluding items that we do not believe are indicative of our core operating performance. Management believes Adjusted EBITDA is helpful in highlighting trends in our operating results, while other measures can differ significantly depending on long‑term strategic decisions regarding capital structure, the tax jurisdictions in which companies operate and capital investments. In addition, we utilize Adjusted EBITDA in certain calculations under the ABL Facility and the First Lien Facility. The ABL Facility and the First Lien Facility permit us to make certain additional adjustments in calculating Consolidated EBITDA, such as projected net cost savings, which are not reflected in the Adjusted EBITDA data presented in this Quarterly Report on Form 10‑Q. The following tables present segment results for the three and nine months ended January 31, 2019 and 2018: Three Months Ended January 31, 2019 Depreciation and Adjusted Net Sales Gross Profit Amortization EBITDA (in thousands) Geographic divisions $ 717,984 $ 232,201 $ 29,368 $ 59,321 Other 5,918 2,025 55 396 Corporate — — 797 — $ 723,902 $ 234,226 $ 30,220 $ 59,717 Three Months Ended January 31, 2018 Depreciation and Adjusted Net Sales Gross Profit Amortization EBITDA (in thousands) Geographic divisions $ 579,974 $ 193,329 $ 16,252 $ 41,658 Other 5,534 2,091 59 549 Corporate — — 179 — $ 585,508 $ 195,420 $ 16,490 $ 42,207 Nine Months Ended January 31, 2019 Depreciation and Adjusted Net Sales Gross Profit Amortization EBITDA (in thousands) Geographic divisions $ 2,316,732 $ 740,591 $ 85,284 $ 220,365 Other 19,151 6,601 168 1,769 Corporate — — 1,877 — $ 2,335,883 $ 747,192 $ 87,329 $ 222,134 Nine Months Ended January 31, 2018 Depreciation and Adjusted Net Sales Gross Profit Amortization EBITDA (in thousands) Geographic divisions $ 1,858,259 $ 606,388 $ 48,744 $ 147,534 Other 17,410 6,396 183 1,667 Corporate — — 621 — $ 1,875,669 $ 612,784 $ 49,548 $ 149,201 The following table presents a reconciliation of Adjusted EBITDA to net income for the three and nine months ended January 31, 2019 and 2018: Three Months Ended Nine Months Ended January 31, January 31, 2019 2018 2019 2018 (in thousands) Net income $ 5,815 $ 19,686 $ 39,377 $ 53,052 Interest expense 19,526 7,871 54,896 23,288 Write-off of debt discount and deferred financing fees — — — 74 Interest income (10) (44) (43) (93) Provision (benefit) for income taxes 1,442 (4,488) 12,337 15,555 Depreciation expense 11,919 6,009 34,067 18,021 Amortization expense 18,301 10,481 53,262 31,527 Stock appreciation expense(a) 442 631 1,425 1,863 Redeemable noncontrolling interests(b) (35) 340 778 1,370 Equity-based compensation(c) 1,140 430 2,638 1,277 Severance and other permitted costs(d) 229 8 5,947 325 Transaction costs (acquisitions and other)(e) 1,066 75 6,660 321 Gain on sale of assets (118) (51) (412) (648) Effects of fair value adjustments to inventory(f) — 89 4,129 276 Change in fair value of financial instruments(g) — 276 6,395 710 Secondary public offering costs(h) — 894 — 1,525 Debt transaction costs(i) — — 678 758 Adjusted EBITDA $ 59,717 $ 42,207 $ 222,134 $ 149,201 (a) Represents non‑cash expense related to stock appreciation rights agreements. (b) Represents non‑cash compensation expense related to changes in the redemption values of noncontrolling interests . (c) Represents non‑cash equity‑based compensation expense related to the issuance of share-based awards. (d) Represents severance expenses and other costs permitted in calculations under the ABL Facility and the First Lien Facility. (e) Represents one‑time costs related to acquisitions paid to third parties. (f) Represents the non‑cash cost of sales impact of purchase accounting adjustments to increase inventory to its estimated fair value. (g) Represents the mark‑to‑market adjustments for derivative financial instruments. (h) Represents one-time costs related to our secondary offering paid to third-party advisors. (i) Represents costs paid to third-party advisors related to debt refinancing activities. Revenues by Product The following table presents the Company’s net sales to external customers by main product lines for the three and nine months ended January 31, 2019 and 2018: Three Months Ended Nine Months Ended January 31, January 31, 2019 2018 2019 2018 (in thousands) Wallboard $ 297,358 $ 256,413 $ 949,781 $ 829,568 Ceilings 105,219 90,360 339,450 291,716 Steel framing 117,432 96,744 382,304 304,598 Other products 203,893 141,991 664,348 449,787 Total net sales $ 723,902 $ 585,508 $ 2,335,883 $ 1,875,669 Geographic Information The following table presents the Company’s net sales by major geographic area for the three and nine months ended January 31, 2019 and 2018: Three Months Ended Nine Months Ended January 31, January 31, 2019 2018 2019 2018 (in thousands) United States $ 624,672 $ 585,508 $ 2,021,750 $ 1,875,669 Canada 99,230 — 314,133 — Total net sales $ 723,902 $ 585,508 $ 2,335,883 $ 1,875,669 The average exchange rates for translating Canada net sales from Canadian dollars to U.S. dollars were 0.7491 and 0.7609 for the three and nine months ended January 31, 2019, respectively. The average exchange rates were 0.7895 and 0.7875 for the three and nine months ended January 31, 2018, respectively. The following table presents the Company’s long-lived assets by major geographic area as of January 31, 2019 and April 30, 2018: January 31, April 30, 2019 2018 (in thousands) United States $ 871,596 $ 813,909 Canada 480,994 — Total long-lived assets $ 1,352,590 $ 813,909

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Jan. 31, 2019
Earnings Per Common Share
Earnings Per Common Share	14. Earnings Per Common Share The following table sets forth the computation of basic and diluted earnings per share of common stock for the three and nine months ended January 31, 2019 and 2018: Three Months Ended Nine Months Ended January 31, January 31, 2019 2018 2019 2018 (in thousands, except per share data) Net income $ 5,815 $ 19,686 $ 39,377 $ 53,052 Less: Net income allocated to participating securities 156 — 940 — Net income attributable to common stockholders $ 5,659 $ 19,686 $ 38,437 $ 53,052 Basic earnings per common share: Basic weighted average common shares outstanding 40,912 41,036 41,053 41,004 Basic earnings per common share $ 0.14 $ 0.48 $ 0.94 $ 1.29 Diluted earnings per common share: Basic weighted average common shares outstanding 40,912 41,036 41,053 41,004 Add: Common Stock Equivalents 459 1,192 736 1,163 Diluted weighted average common shares outstanding 41,371 42,228 41,789 42,167 Diluted earnings per common share $ 0.14 $ 0.47 $ 0.92 $ 1.26

Subsequent Events

Subsequent Events	9 Months Ended
	Jan. 31, 2019
Subsequent Events
Subsequent Events	15. Subsequent Events In February 2019, the Company entered into an interest rate swap agreement with a notional amount of $500.0 million to convert the variable interest rate on its First Lien Term Loan to a fixed 1-month LIBOR interest rate of 2.46% . This contract was effective on February 28, 2019 and terminates on February 28, 2023. On March 4, 2019, the Company acquired Commercial Builders Group, LLC, an interior building products distributer in LaPlace, Louisiana.

Business, Basis of Presentati_2

Business, Basis of Presentation and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Jan. 31, 2019
Business, Basis of Presentation and Summary of Significant Accounting Policies
Basis of Presentation	Basis of Presentation The condensed consolidated financial statements included in this Quarterly Report on Form 10‑Q have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) that permit reduced disclosure for interim periods. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all normal and recurring adjustments necessary for a fair presentation of the results of operations, financial position and cash flows. All adjustments are of a normal recurring nature unless otherwise disclosed. The results of operations for interim periods are not necessarily indicative of results for any other interim period or the entire fiscal year . As a result, the unaudited condensed consolidated financial statements should be read in conjunction with our audited consolidated financial statements included in our Annual Report on Form 10‑K for the fiscal year ended April 30, 2018.
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements present the results of operations, financial position and cash flows of the Company and its subsidiaries. All material intercompany balances and transactions have been eliminated in consolidation. The results of operations of businesses acquired are included from their respective dates of acquisition.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with Generally Accepted Accounting Principles (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Foreign Currency Translation	Foreign Currency Translation Assets and liabilities of the Company’s Canadian subsidiaries are translated at the exchange rate prevailing at the balance sheet date, while income and expenses are translated at average rates for the period. Translation gains and losses are reported as a separate component of stockholders’ equity and other comprehensive income. Gains and losses on foreign currency transactions are recognized in the Condensed Consolidated Statements of Operations and Comprehensive Income within other income, net.
Insurance Liabilities	Insurance Liabilities The Company is self‑insured for certain losses related to medical claims. The Company has stop‑loss coverage to limit the exposure arising from medical claims. The Company has deductible‑based insurance policies for certain losses related to general liability, automobile and workers’ compensation. The deductible amount per incident is $0.3 million, $0.5 million and $1.0 million for general liability, workers’ compensation and automobile, respectively. The coverage consists of a primary layer and an excess layer. The primary layer of coverage is from $0.5 million to $2.0 million and the excess layer cover claims from $2.0 million to $100.0 million. The expected ultimate cost for claims incurred as of the balance sheet date is not discounted and is recognized as a liability. Insurance losses for claims filed and claims incurred but not reported are accrued based upon estimates of the aggregate liability for uninsured claims using loss development factors, actuarial assumptions and historical loss development experience. As of January 31, 2019 and April 30, 2018, the aggregate liabilities for medical self‑insurance were $3.7 million and $4.1 million, respectively, and are included in other accrued expenses and current liabilities in the Condensed Consolidated Balance Sheets. As of January 31, 2019 and April 30, 2018, reserves for general liability, automobile and workers’ compensation totaled approximately $14.2 million and $14.7 million, respectively, and are included in other accrued expenses and current liabilities and other liabilities in the Condensed Consolidated Balance Sheets. As of January 31, 2019 and April 30, 2018, expected recoveries for medical self‑insurance, general liability, automobile and workers’ compensation totaled approximately $4.2 million and $4.8 million, respectively, and are included in prepaid expenses and other current assets and other assets in the Condensed Consolidated Balance Sheets.
Restructuring	Restructuring The Company recognizes a liability for costs associated with an exit or disposal activity when the liability is incurred. After the appropriate level of management approves the detailed restructuring plan and the appropriate criteria for recognition are met, the Company establishes accruals for employee termination and other costs, as applicable. During the nine months ended January 31, 2019, the Company initiated a reduction in workforce as part of a strategic cost reduction plan to improve operational efficiency. The Company recorded $5.2 million of restructuring costs during the nine months ended January 31, 2019 in connection with the reduction in workforce and certain other restructuring activities, consisting primarily of severance and other employee costs. Such costs are classified within selling, general and administrative expenses in the Condensed Consolidated Statements of Operations and Comprehensive Income. The Company made payments of $4.6 million during the nine months ended January 31, 2019. As of January 31, 2019, the Company had a remaining liability of $0.6 million, which was classified within other accrued expenses and current liabilities in the Condensed Consolidated Balance Sheet.
Income Taxes	Income Taxes The Company considers each interim period an integral part of the annual period and measures tax expense (benefit) using an estimated annual effective income tax rate. Estimates of the annual effective income tax rate at the end of interim periods are, out of necessity, based on evaluation of possible future events and transactions and may be subject to subsequent refinement or revision. The Company forecasts its estimated annual effective income tax rate and then applies that rate to its year‑to‑date pre‑tax ordinary income (loss), subject to certain loss limitation provisions. In addition, certain specific transactions are excluded from the Company’s estimated annual effective tax rate computation, but are discretely recognized within income tax expense (benefit) in their respective interim period. Future changes in the forecasted annual income (loss) projections, tax rate changes, or discrete tax items could result in significant adjustments to quarterly income tax expense (benefit) in future periods. The Company evaluates its deferred tax assets quarterly to determine if valuation allowances are required. In this evaluation, the Company considers both positive and negative evidence in determining whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The primary negative evidence considered includes the cumulative operating losses generated in prior periods. The primary positive evidence considered includes the reversal of deferred tax liabilities primarily related to depreciation and amortization that would occur within the same jurisdiction and during the carryforward period necessary to absorb the federal and state net operating losses and other deferred tax assets. Deferred tax assets and liabilities are computed by applying the federal and state income tax rates in effect to the gross amounts of temporary differences and other tax attributes, such as net operating loss carry‑forwards. In assessing if the deferred tax assets will be realized, the Company considers whether it is more likely than not that some or all of these deferred tax assets will be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the period in which these deductible temporary differences reverse.
Fair Value of Financial Instruments	Fair Value of Financial Instruments Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Authoritative guidance for fair value measurements establishes a three‑level hierarchy that prioritizes the inputs to valuation models based upon the degree to which they are observable. The three levels of the fair value measurement hierarchy are as follows: Level 1 Inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date. Level 2 Inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. Level 3 Inputs are unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions. The carrying values of the Company’s cash, cash equivalents, trade receivables and trade payables approximate their fair values because of their short‑term nature. Based on borrowing rates available to the Company for loans with similar terms, the carrying values of the Company’s debt instruments approximate fair value. See Note 10, “Fair Value Measurements,” for additional information with respect to the Company’s fair value measurements.
Earnings Per Share	Earnings Per Share Basic earnings per share is computed by dividing net income available to common stockholders by the weighted average number of outstanding shares of common stock for the period. Diluted earnings per share reflects the potential dilution that could occur if securities or other contracts to issue common stock, including stock options and restricted stock units (collectively “Common Stock Equivalents”), were exercised or converted into common stock . The dilutive effect of outstanding stock options and restricted stock units is reflected in diluted earnings per share by application of the treasury stock method. In applying the treasury stock method for stock-based compensation arrangements, the assumed proceeds are computed as the sum of the amount the employee must pay upon exercise and the amount of compensation cost attributed to future services and not yet recognized. Diluted earnings per share is computed by increasing the weighted‑average number of outstanding shares of common stock computed in basic earnings per share to include the dilutive effect of Common Stock Equivalents for the period. In periods of net loss, the number of shares used to calculate diluted loss per share is the same as basic net loss per share. The holders of the Company’s Exchangeable Shares (as defined in Note 3, “Business Acquisitions” and further described in Note 7, “Stockholders’ Equity”) are entitled to receive dividends or distributions that are equal to any dividends or distributions on the Company’s common stock. As a result, the Exchangeable Shares are classified as a participating security and thereby require the allocation of income that would have otherwise been available to common stockholders when calculating earnings per share. Diluted earnings per share is calculated by utilizing the most dilutive result of the if-converted and two-class methods. In both methods, net income attributable to common stockholders and the weighted-average common shares outstanding are adjusted to account for the impact of the assumed issuance of potential common shares that are dilutive, subject to dilution sequencing rules.
Recent Accounting Pronouncements	Recently Adopted Accounting Pronouncements Revenue recognition — In May 2014, the Financial Accounting Standards Board (the “FASB”) issued authoritative guidance on revenue from contracts with customers. The new guidance supersedes most existing revenue recognition guidance and outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The core principle of the revenue model is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The new standard also requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers . In August 2015, the FASB issued guidance that deferred the effective date by one year. The standard is required to be adopted by public business entities in annual periods beginning on or after December 15, 2017, and interim periods within those annual periods, and may be applied on a full retrospective or modified retrospective approach. Early adoption at the original effective date is permitted. The Company adopted this guidance on May 1, 2018 (the first day of fiscal 2019) using the modified retrospective approach. The adoption of the new guidance, using the modified retrospective approach, did not have a material impact on the Company’s financial statements. The adoption of the new guidance resulted in a $3.6 million reclassification in the Condensed Consolidated Balance Sheet from trade accounts and notes receivable to other accrued expenses and current liabilities for estimated sales returns. The adoption of the new revenue guidance also resulted in additional disclosures regarding the Company’s revenue recognition. The additional disclosures required by this new standard are contained in Note 2, “Revenue.” Statement of Cash Flows – In August 2016, the FASB issued new guidance to reduce diversity in practice related to certain cash receipts and payment in the statement of cash flows by adding or clarifying guidance on eight specific cash flow issues. The new guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017 . The Company adopted this guidance on May 1, 2018. As a result of the adoption, the Company now classifies cash payments for debt prepayment or debt extinguishment costs, including third-party costs and other fees paid to lenders that are directly related to the debt prepayment or debt extinguishment, as cash outflows for financing activities. This resulted in a $2.7 million reclass from cash (used in) provided by operating activities (specifically the line item changes in other accrued expenses and current liabilities) to cash provided by financing activities (specifically the line item debt issuance costs) in the Condensed Consolidated Statement of Cash Flows for the nine months ended January 31, 2019 . The adoption did not have any other material impact on the Company’s financial statements. Income Taxes – In October 2016, the FASB issued new guidance intended to improve the accounting for intra-entity transfers of assets other than inventory by requiring recognition of income tax consequences when such a transfer occurs. The new guidance is effective for annual and interim periods beginning after December 15, 2017. Early adoption is permitted. The amendments in this update should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Company adopted this guidance on May 1, 2018 with no material impact on its financial statements. Derivatives – In August 2017, the FASB issued new guidance on accounting for hedging activities, which expands and refines hedge accounting for both non-financial and financial risk components and aligns the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. The new guidance is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years . The Company adopted this guidance on November 1, 2018 with no material impact on its financial statements. Recently Issued Accounting Pronouncements Leases —In February 2016, the FASB issued authoritative guidance on accounting for leases. The new standard establishes a right-of-use (ROU) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than twelve months. Leases will be classified as either finance or operating, with such classification affecting the pattern of expense recognition in the statement of operations. The new standard is effective for the Company’s fiscal year beginning May 1, 2019 (the first day of fiscal 2020), including interim reporting periods within that fiscal year. A modified transition approach is required for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. On July 30, 2018, the FASB issued new guidance that provides entities with an additional (and optional) transition method to adopt the new lease standard. Under this new transition method, an entity initially applies the new lease standard at the adoption date and recognizes a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. We have not yet determined whether we will use the newly permitted adoption method. While the Company is still evaluating the impact of its pending adoption of the new standard on its financial statements, the Company expects that the adoption will result in a material increase in the assets and liabilities recorded on our Condensed Consolidated Balance Sheets and additional qualitative and quantitative disclosures . We are continuing to evaluate the method of adoption and c urrently finalizing our accounting policies, implementing a new leasing system, determining changes needed in current processes for lease accounting and verifying the completeness of our lease population and, thus, we are unable to quantify the financial statement impact at this time. Goodwill – In January 2017, the FASB issued authoritative guidance that simplifies the accounting for goodwill impairments by eliminating Step 2 from the goodwill impairment test . Under the new guidance, goodwill impairment will be the amount by which a reporting unit’s carrying value exceeds its fair value. The new standard is effective for annual and any interim impairment tests for periods beginning after December 15, 2019. Early adoption is permitted. The Company does not expect the adoption of this standard to have a material impact on its financial statements. Accumulated Other Comprehensive Income – In February 2018, the FASB issued authoritative guidance which permits entities to reclassify, to retained earnings, the one-time income tax effects stranded in accumulated other comprehensive income arising from the change in the U.S. federal corporate tax rate as a result of the Tax Cuts and Jobs Act of 2017. An entity that elects to make this reclassification must consider all items in accumulated other comprehensive income that have tax effects stranded as a result of the tax rate change, and must disclose the reclassification of these tax effects as well as the entity’s policy for releasing income tax effects from accumulated other comprehensive income. The new guidance may be applied either retrospectively or as of the beginning of the period of adoption. The new guidance is effective for fiscal years beginning after December 15, 2018 , including interim periods within those fiscal years . Early adoption is permitted. The Company plans to adopt this guidance on May 1, 2019 (the first day of fiscal 2020). While this guidance will have no impact on the Company’s results of operations, the Company is currently assessing this standard’s impact on its consolidated financial position. Cloud Computing Costs – In August 2018, the FASB issued new guidance that clarifies the accounting treatment for implementation costs for cloud computing arrangements (hosting arrangements) that is a service contract. This guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within that fiscal year. Early adoption is permitted. The Company is currently assessing the effect that this new guidance will have on its financial position, results of operations and disclosures. Fair Value Measurement Disclosures – In August 2018, the FASB issued new guidance that changes certain fair value measurement disclosure requirements . This guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. An entity is permitted to early adopt all of the disclosure changes or early adopt only the removed disclosure requirements and delay adoption of the additional disclosures until the effective date of this amendment. Except for changes to certain disclosures related to fair value measurements, the Company does not expect the adoption of this standard to have a material impact on its financial statements.

Business Acquisitions (Tables)

Business Acquisitions (Tables) - Titan	9 Months Ended
	Jan. 31, 2019
Acquisition of Titan
Schedule of preliminary allocation of the consideration transferred	The following table summarizes the preliminary allocation of the consideration transferred, and subsequent measurement period purchase price adjustments recorded, based on currently available information (in thousands): As Previously Reported October 31, 2018 Adjustments January 31, 2019 Cash $ 5,573 $ — $ 5,573 Trade accounts and notes receivable 84,039 970 85,009 Inventories 60,272 — 60,272 Prepaid and other current assets 8,334 — 8,334 Property and equipment 37,263 — 37,263 Goodwill 196,969 (3,171) 193,798 Intangible assets 289,423 (2,469) 286,954 Accounts payable and accrued expenses (40,833) (970) (41,803) Contingent consideration (12,039) — (12,039) Deferred income taxes (14,337) 2,085 (12,252) Fair value of consideration transferred $ 614,664 $ (3,555) $ 611,109
Schedule of preliminary components of intangible assets acquired	The following table summarizes the preliminary components of intangible assets acquired in connection with the acquisition of Titan (dollars in thousands): Weighted Average Amortization Fair Value Period (Years) Customer relationships $ 246,954 15 Tradenames 30,870 15 Developed technology 5,402 5 Non-compete agreements 2,856 3 Other 872 3 Total intangible assets $ 286,954
Schedule of unaudited pro forma consolidated net sales and net income	The following table represents the unaudited pro forma consolidated net sales and net income for the Company for the periods indicated (in thousands): Three Months Ended Nine Months Ended January 31, January 31, 2019 2018 2019 2018 Net sales $ 723,902 $ 693,205 $ 2,381,039 $ 2,238,185 Net income 5,815 16,513 35,894 54,188

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Jan. 31, 2019
Goodwill and Intangible Assets
Schedule of changes in the carrying amount of goodwill	Carrying Amount (in thousands) Balance as of April 30, 2018 $ 427,645 Goodwill acquired 194,436 Purchase price adjustments from prior periods 8 Translation adjustment (2,535) Balance as of January 31, 2019 $ 619,554
Schedule of components of definite-lived intangible assets	Estimated Weighted January 31, 2019 Useful Average Gross Net Lives Amortization Carrying Accumulated Carrying (years) Period Amount Amortization Value (dollars in thousands) Customer relationships 5 - 16 12.9 $ 526,120 $ 198,642 $ 327,478 Definite-lived tradenames 5 - 20 16.3 56,695 6,128 50,567 Vendor agreements 8 - 10 8.3 6,644 3,560 3,084 Developed technology 5 4.9 5,328 723 4,605 Leasehold interests 1 - 15 7.6 3,726 1,319 2,407 Other 3 - 5 3.4 4,181 878 3,303 Totals $ 602,694 $ 211,250 $ 391,444 Estimated Weighted April 30, 2018 Useful Average Gross Net Lives Amortization Carrying Accumulated Carrying (years) Period Amount Amortization Value (dollars in thousands) Customer relationships 5 - 13 10.9 $ 282,547 $ 150,081 $ 132,466 Definite-lived tradenames 5 - 20 18.0 26,250 3,578 22,672 Vendor agreement 8 - 10 8.3 6,644 2,956 3,688 Leasehold interests 7 - 15 9.0 2,866 832 2,034 Other 5 5.0 521 66 455 Totals $ 318,828 $ 157,513 $ 161,315

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Jan. 31, 2019
Long-Term Debt
Schedule of long-term debt	January 31, April 30, 2019 2018 (in thousands) First Lien Term Loan (1) (2) $ 974,555 $ 563,179 ABL Facility 137,898 — Capital lease obligations 105,489 18,564 Installment notes at fixed rates up to 5.0%, due in monthly and annual installments through 2023 (3) 15,908 14,143 Carrying value of debt 1,233,850 595,886 Less current portion 40,328 16,284 Long-term debt $ 1,193,522 $ 579,602 (1) Net of unamortized discount of $2,238 and $2,536 as of January 31, 2019 and April 30, 2018, respectively. (2) Net of deferred financing costs of $12,570 and $6,125 as of January 31, 2019 and April 30, 2018, respectively. (3) Net of unamortized discount of $1,273 and $1,534 as of January 31, 2019 and April 30, 2018, respectively.
Scheduled principal payments of long-term debt	First Lien ABL Capital Installment Term Loan(1) Facility Leases Notes(2) Total Years ending April 30, (in thousands) 2019 (remaining three months) $ 2,491 $ — $ 5,693 $ 604 $ 8,788 2020 9,968 — 26,343 4,363 40,674 2021 9,968 — 25,039 4,053 39,060 2022 9,968 137,898 21,430 3,617 172,913 2023 9,968 — 16,019 3,584 29,571 Thereafter 947,000 — 10,965 960 958,925 $ 989,363 $ 137,898 $ 105,489 $ 17,181 $ 1,249,931 (1) Gross of unamortized discount of $2,238 and deferred financing costs of $12,570 as of January 31, 2019. (2) Gross of unamortized discount of $1,273 as of January 31, 2019.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Jan. 31, 2019
Stockholders’ Equity
Schedule of changes to accumulated other comprehensive income (loss), net of tax, by component	Accumulated Other Comprehensive Income (Loss) (in thousands) Accumulated other comprehensive income as of April 30, 2018 $ 441 Foreign currency translation adjustments (8,821) Other comprehensive loss on interest rate cap (237) Reclassification to earnings from accumulated other comprehensive income for interest rate cap 728 Accumulated other comprehensive loss as of January 31, 2019 $ (7,889)

Equity-Based Compensation - (Ta

Equity-Based Compensation - (Tables)	9 Months Ended
	Jan. 31, 2019
Equity-Based Compensation
Summary of stock option activity	Weighted Weighted Average Average Remaining Aggregate Number of Exercise Contractual Intrinsic Options Price Life (years) Value (shares and dollars in thousands) Outstanding as of April 30, 2018 1,952 $ 14.37 6.52 $ 33,209 Options granted 374 25.58 Options exercised (103) 12.41 Options forfeited (41) 27.00 Options expired — — Outstanding as of January 31, 2019 2,182 $ 16.15 6.35 $ 10,261 Exercisable as of January 31, 2019 1,724 $ 13.51 5.63 $ 10,217 Vested and expected to vest as of January 31, 2019 2,173 $ 16.10 6.34 $ 10,260
Schedule of weighted average assumptions used in Black-Scholes option-pricing model	Nine Months Ended January 31, 2019 Volatility 33.71 % Expected life (years) Risk-free interest rate 2.87 % Dividend yield — %
Summary of restricted stock unity activity	Weighted Number of Average Restricted Exercise Stock Units Price (shares in thousands) Outstanding as of April 30, 2018 22 $ 37.49 Granted 188 24.87 Vested (7) 37.49 Forfeited (15) 26.41 Outstanding as of January 31, 2019 188 $ 25.72

Stock Appreciation Rights, De_2

Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests (Tables)	9 Months Ended
	Jan. 31, 2019
Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests
Summary of changes to liability for equity based compensation arrangements	Stock Redeemable Appreciation Deferred Noncontrolling Rights Compensation Interests (in thousands) Balance as of April 30, 2018 $ 21,944 $ 2,222 $ 16,170 Amounts redeemed (1,216) (715) (4,673) Change in fair value 1,426 118 661 Balance as of January 31, 2019 $ 22,154 $ 1,625 $ 12,158 Classified as current as of April 30, 2018 $ 308 $ 133 $ 463 Classified as long-term as of April 30, 2018 21,636 2,089 15,707 Classified as current as of January 31, 2019 $ 981 $ — $ 1,034 Classified as long-term as of January 31, 2019 21,173 1,625 11,124

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Jan. 31, 2019
Fair Value Measurements
Schedule of assets and liabilities measured at fair value on a recurring basis	January 31, April 30, 2019 2018 (in thousands) Assets: Interest rate cap (Level 2) $ — $ 543 Liabilities: Forward currency forward (Level 2) $ — $ 5,108 Stock appreciation rights (Level 3) 22,154 21,944 Deferred compensation (Level 3) 1,625 2,222 Noncontrolling interest holders (Level 3) 12,158 16,170 Contingent consideration (Level 3) 12,406 —

Segments (Tables)

Segments (Tables)	9 Months Ended
	Jan. 31, 2019
Segments
Schedule of segment results	Three Months Ended January 31, 2019 Depreciation and Adjusted Net Sales Gross Profit Amortization EBITDA (in thousands) Geographic divisions $ 717,984 $ 232,201 $ 29,368 $ 59,321 Other 5,918 2,025 55 396 Corporate — — 797 — $ 723,902 $ 234,226 $ 30,220 $ 59,717 Three Months Ended January 31, 2018 Depreciation and Adjusted Net Sales Gross Profit Amortization EBITDA (in thousands) Geographic divisions $ 579,974 $ 193,329 $ 16,252 $ 41,658 Other 5,534 2,091 59 549 Corporate — — 179 — $ 585,508 $ 195,420 $ 16,490 $ 42,207 Nine Months Ended January 31, 2019 Depreciation and Adjusted Net Sales Gross Profit Amortization EBITDA (in thousands) Geographic divisions $ 2,316,732 $ 740,591 $ 85,284 $ 220,365 Other 19,151 6,601 168 1,769 Corporate — — 1,877 — $ 2,335,883 $ 747,192 $ 87,329 $ 222,134 Nine Months Ended January 31, 2018 Depreciation and Adjusted Net Sales Gross Profit Amortization EBITDA (in thousands) Geographic divisions $ 1,858,259 $ 606,388 $ 48,744 $ 147,534 Other 17,410 6,396 183 1,667 Corporate — — 621 — $ 1,875,669 $ 612,784 $ 49,548 $ 149,201
Reconciliation of Adjusted EBITDA to net income	Three Months Ended Nine Months Ended January 31, January 31, 2019 2018 2019 2018 (in thousands) Net income $ 5,815 $ 19,686 $ 39,377 $ 53,052 Interest expense 19,526 7,871 54,896 23,288 Write-off of debt discount and deferred financing fees — — — 74 Interest income (10) (44) (43) (93) Provision (benefit) for income taxes 1,442 (4,488) 12,337 15,555 Depreciation expense 11,919 6,009 34,067 18,021 Amortization expense 18,301 10,481 53,262 31,527 Stock appreciation expense(a) 442 631 1,425 1,863 Redeemable noncontrolling interests(b) (35) 340 778 1,370 Equity-based compensation(c) 1,140 430 2,638 1,277 Severance and other permitted costs(d) 229 8 5,947 325 Transaction costs (acquisitions and other)(e) 1,066 75 6,660 321 Gain on sale of assets (118) (51) (412) (648) Effects of fair value adjustments to inventory(f) — 89 4,129 276 Change in fair value of financial instruments(g) — 276 6,395 710 Secondary public offering costs(h) — 894 — 1,525 Debt transaction costs(i) — — 678 758 Adjusted EBITDA $ 59,717 $ 42,207 $ 222,134 $ 149,201 (a) Represents non‑cash expense related to stock appreciation rights agreements. (b) Represents non‑cash compensation expense related to changes in the redemption values of noncontrolling interests . (c) Represents non‑cash equity‑based compensation expense related to the issuance of share-based awards. (d) Represents severance expenses and other costs permitted in calculations under the ABL Facility and the First Lien Facility. (e) Represents one‑time costs related to acquisitions paid to third parties. (f) Represents the non‑cash cost of sales impact of purchase accounting adjustments to increase inventory to its estimated fair value. (g) Represents the mark‑to‑market adjustments for derivative financial instruments. (h) Represents one-time costs related to our secondary offering paid to third-party advisors. (i) Represents costs paid to third-party advisors related to debt refinancing activities.
Schedule of net sales to external customers by main product lines	Three Months Ended Nine Months Ended January 31, January 31, 2019 2018 2019 2018 (in thousands) Wallboard $ 297,358 $ 256,413 $ 949,781 $ 829,568 Ceilings 105,219 90,360 339,450 291,716 Steel framing 117,432 96,744 382,304 304,598 Other products 203,893 141,991 664,348 449,787 Total net sales $ 723,902 $ 585,508 $ 2,335,883 $ 1,875,669
Schedule of net sales by major geographic area	Three Months Ended Nine Months Ended January 31, January 31, 2019 2018 2019 2018 (in thousands) United States $ 624,672 $ 585,508 $ 2,021,750 $ 1,875,669 Canada 99,230 — 314,133 — Total net sales $ 723,902 $ 585,508 $ 2,335,883 $ 1,875,669
Schedule of long-lived assets by major geographic area	January 31, April 30, 2019 2018 (in thousands) United States $ 871,596 $ 813,909 Canada 480,994 — Total long-lived assets $ 1,352,590 $ 813,909

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Jan. 31, 2019
Earnings Per Common Share
Schedule of computation of basic and diluted earnings per share of common stock	Three Months Ended Nine Months Ended January 31, January 31, 2019 2018 2019 2018 (in thousands, except per share data) Net income $ 5,815 $ 19,686 $ 39,377 $ 53,052 Less: Net income allocated to participating securities 156 — 940 — Net income attributable to common stockholders $ 5,659 $ 19,686 $ 38,437 $ 53,052 Basic earnings per common share: Basic weighted average common shares outstanding 40,912 41,036 41,053 41,004 Basic earnings per common share $ 0.14 $ 0.48 $ 0.94 $ 1.29 Diluted earnings per common share: Basic weighted average common shares outstanding 40,912 41,036 41,053 41,004 Add: Common Stock Equivalents 459 1,192 736 1,163 Diluted weighted average common shares outstanding 41,371 42,228 41,789 42,167 Diluted earnings per common share $ 0.14 $ 0.47 $ 0.92 $ 1.26

Business, Basis of Presentati_3

Business, Basis of Presentation and Summary of Significant Accounting Policies - Business (Details)	9 Months Ended
	Jan. 31, 2019item
Minimum
Business
Number of distribution centers	245

Business, Basis of Presentati_4

Business, Basis of Presentation and Summary of Significant Accounting Policies - Insurance Liabilities (Details) - USD ($) $ in Millions	Jan. 31, 2019	Apr. 30, 2018
Other accrued expenses and current liabilities.
Insurance Liabilities
Aggregate liabilities for medical self-insurance	$ 3.7	$ 4.1
General liability
Insurance Liabilities
Deductible amount	0.3
Workers' compensation
Insurance Liabilities
Deductible amount	0.5
Automobile
Insurance Liabilities
Deductible amount	1
General liability, workers' compensation and automobile | Other accrued expenses and current liabilities.
Insurance Liabilities
Reserve for insurance	14.2	14.7
General liability, workers' compensation and automobile | Prepaid expenses and other current assets
Insurance Liabilities
Insurance recovery receivable	4.2	$ 4.8
General liability, workers' compensation and automobile | Minimum
Insurance Liabilities
Primary layer of insurance coverage	0.5
Excess layer of insurance coverage	2
General liability, workers' compensation and automobile | Maximum
Insurance Liabilities
Primary layer of insurance coverage	2
Excess layer of insurance coverage	$ 100

Business, Basis of Presentati_5

Business, Basis of Presentation and Summary of Significant Accounting Policies - Restructuring charges (Details) $ in Millions	9 Months Ended
	Jan. 31, 2019USD ($)
Payments	$ 4.6
Other accrued expenses and current liabilities
Remaining liability	0.6
Selling, general and administrative expenses
Restructuring costs	$ 5.2

Business, Basis of Presentati_6

Business, Basis of Presentation and Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Apr. 30, 2018
Adoption of new accounting pronouncement
Trade accounts and notes receivable	$ 410,017		$ 346,450
Other accrued expenses and current liabilities	60,488		$ 45,146
Other accrued expenses and liabilities	446	$ 312
Debt issuance costs	7,933	$ 3,283
ASU 2014-09
Adoption of new accounting pronouncement
Trade accounts and notes receivable	3,600
Other accrued expenses and current liabilities	3,600
ASU 2016-15
Adoption of new accounting pronouncement
Other accrued expenses and liabilities	2,700
Debt issuance costs	$ 2,700

Revenues (Details)

Revenues (Details) - USD ($) $ in Millions	9 Months Ended
	Jan. 31, 2019	May 01, 2018
Revenue
Revenue, Practical Expedient, Financing Component [true false]	true
Revenue, Practical Expedient, Remaining Performance Obligation [true/false]	true
Receivables from contracts with customers	$ 389.4	$ 326.6

Business Acquisitions (Details)

Business Acquisitions (Details) $ in Thousands, shares in Millions, $ in Millions	Jun. 01, 2018CAD ($)shares	Jun. 01, 2018USD ($)itemshares	Jun. 07, 2017USD ($)	Jan. 31, 2019USD ($)	Jan. 31, 2018USD ($)
Acquisition of Titan
Drew down				$ 886,896	$ 493,739
Loan repayment				$ 571,840	$ 477,616
Third Amendment
Acquisition of Titan
Aggregate principal amount		$ 996,800
Third Amendment | LIBOR
Acquisition of Titan
Variable rate floor (as a percent)	0.00%	0.00%
Margin added to variable rate (as a percent)	2.75%	2.75%
First Lien Term Loan Due 2025
Acquisition of Titan
Loan repayment		$ 571,800	$ 477,600
Titan
Acquisition of Titan
Number of locations | item		30
Number of provinces | item		5
Aggregate purchase price	$ 800	$ 627,000
Issuance of shares to current shareholders of Titan (in shares) | shares	1.1	1.1
Purchase price
Fair value of consideration transferred		$ 611,100
Cash		581,500
Issuance preferred stock to current shareholders of Titan		29,600
Titan | Third Amendment
Acquisition of Titan
Aggregate principal amount		$ 996,800
Titan | Third Amendment | LIBOR
Acquisition of Titan
Variable rate floor (as a percent)	0.00%	0.00%
Margin added to variable rate (as a percent)	2.75%	2.75%
Titan | ABL facility
Acquisition of Titan
Drew down		$ 143,000
Titan | First Lien Term Loan Due 2025
Acquisition of Titan
Loan repayment		$ 571,800

Business Acquisitions - Prelimi

Business Acquisitions - Preliminary Allocation (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Oct. 31, 2018	Jun. 01, 2018	Apr. 30, 2018
Preliminary Purchase Price Allocation
Goodwill	$ 619,554			$ 427,645
Titan
Preliminary Purchase Price Allocation
Cash	5,573
Trade accounts and notes receivable	85,009
Inventories	60,272
Prepaid and other current assets	8,334
Property and equipment	37,263
Goodwill	193,798
Intangible assets	286,954		$ 286,954
Accounts payable and accrued expenses	(41,803)
Contingent consideration	(12,039)
Deferred income taxes	(12,252)
Fair value of consideration transferred	611,109
Titan | As previously reported
Preliminary Purchase Price Allocation
Cash		$ 5,573
Trade accounts and notes receivable		84,039
Inventories		60,272
Prepaid and other current assets		8,334
Property and equipment		37,263
Goodwill		196,969
Intangible assets		289,423
Accounts payable and accrued expenses		(40,833)
Contingent consideration		(12,039)
Deferred income taxes		(14,337)
Fair value of consideration transferred		$ 614,664
Titan | Adjustment
Preliminary Purchase Price Allocation
Trade accounts and notes receivable	970
Goodwill	(3,171)
Intangible assets	(2,469)
Accounts payable and accrued expenses	(970)
Deferred income taxes	2,085
Fair value of consideration transferred	$ (3,555)

Business Acquisitions - Trade a

Business Acquisitions - Trade accounts and notes receivable (Details) - Titan $ in Millions	Jun. 01, 2018USD ($)
Trade accounts and notes receivable
Fair value	$ 85
Gross contractual amount	$ 86.6

Business Acquisitions - Preli_2

Business Acquisitions - Preliminary components of intangible assets (Details) - USD ($) $ in Thousands	Jun. 01, 2018	Jan. 31, 2019	Apr. 30, 2018
Customer relationships
Acquisition of Titan
Weighted Average Amortization Period (in years)		12 years 10 months 24 days	10 years 10 months 24 days
Tradenames
Acquisition of Titan
Weighted Average Amortization Period (in years)		16 years 3 months 18 days	18 years
Developed technology
Acquisition of Titan
Weighted Average Amortization Period (in years)		4 years 10 months 24 days
Other
Acquisition of Titan
Weighted Average Amortization Period (in years)		3 years 4 months 24 days	5 years
Titan
Acquisition of Titan
Fair value	$ 286,954	$ 286,954
Titan | Customer relationships
Acquisition of Titan
Fair value	$ 246,954
Weighted Average Amortization Period (in years)	15 years
Titan | Tradenames
Acquisition of Titan
Fair value	$ 30,870
Weighted Average Amortization Period (in years)	15 years
Titan | Developed technology
Acquisition of Titan
Fair value	$ 5,402
Weighted Average Amortization Period (in years)	5 years
Titan | Non-compete agreements
Acquisition of Titan
Fair value	$ 2,856
Weighted Average Amortization Period (in years)	3 years
Titan | Other
Acquisition of Titan
Fair value	$ 872
Weighted Average Amortization Period (in years)	3 years

Business Acquisitions - Net sal

Business Acquisitions - Net sales and net losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Acquisition of Titan
Net sales	$ 723,902	$ 585,508	$ 2,335,883	$ 1,875,669
Operating income	$ 25,826	$ 22,668	110,980	$ 91,004
Titan
Acquisition of Titan
Net sales			314,100
Operating income			$ 8,700

Business Acquisitions - Pro for

Business Acquisitions - Pro forma information (Details) - Titan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Pro forma information
Pro forma net sales	$ 723,902	$ 693,205	$ 2,381,039	$ 2,238,185
Pro forma net income	$ 5,815	$ 16,513	$ 35,894	$ 54,188

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	9 Months Ended
	Jan. 31, 2019USD ($)
Carrying Amount of Goodwill
Balance	$ 427,645
Goodwill acquired	194,436
Purchase price adjustments from prior periods	8
Translation adjustment	(2,535)
Balance	$ 619,554

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Definite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jan. 31, 2019	Apr. 30, 2018
Definite-lived intangible assets
Gross Carrying Amount	$ 602,694	$ 318,828
Accumulated Amortization	211,250	157,513
Net Carrying Value	$ 391,444	$ 161,315
Customer relationships
Definite-lived intangible assets
Weighted Average Amortization Period (in years)	12 years 10 months 24 days	10 years 10 months 24 days
Gross Carrying Amount	$ 526,120	$ 282,547
Accumulated Amortization	198,642	150,081
Net Carrying Value	$ 327,478	$ 132,466
Customer relationships | Minimum
Definite-lived intangible assets
Estimated Useful Lives (years)	5 years	5 years
Customer relationships | Maximum
Definite-lived intangible assets
Estimated Useful Lives (years)	16 years	13 years
Tradenames
Definite-lived intangible assets
Weighted Average Amortization Period (in years)	16 years 3 months 18 days	18 years
Gross Carrying Amount	$ 56,695	$ 26,250
Accumulated Amortization	6,128	3,578
Net Carrying Value	$ 50,567	$ 22,672
Tradenames | Minimum
Definite-lived intangible assets
Estimated Useful Lives (years)	5 years	5 years
Tradenames | Maximum
Definite-lived intangible assets
Estimated Useful Lives (years)	20 years	20 years
Vendor agreements
Definite-lived intangible assets
Weighted Average Amortization Period (in years)	8 years 3 months 18 days	8 years 3 months 18 days
Gross Carrying Amount	$ 6,644	$ 6,644
Accumulated Amortization	3,560	2,956
Net Carrying Value	$ 3,084	$ 3,688
Vendor agreements | Minimum
Definite-lived intangible assets
Estimated Useful Lives (years)	8 years	8 years
Vendor agreements | Maximum
Definite-lived intangible assets
Estimated Useful Lives (years)	10 years	10 years
Developed technology
Definite-lived intangible assets
Estimated Useful Lives (years)	5 years
Weighted Average Amortization Period (in years)	4 years 10 months 24 days
Gross Carrying Amount	$ 5,328
Accumulated Amortization	723
Net Carrying Value	$ 4,605
Leasehold interests
Definite-lived intangible assets
Weighted Average Amortization Period (in years)	7 years 7 months 6 days	9 years
Gross Carrying Amount	$ 3,726	$ 2,866
Accumulated Amortization	1,319	832
Net Carrying Value	$ 2,407	$ 2,034
Leasehold interests | Minimum
Definite-lived intangible assets
Estimated Useful Lives (years)	1 year	7 years
Leasehold interests | Maximum
Definite-lived intangible assets
Estimated Useful Lives (years)	15 years	15 years
Other
Definite-lived intangible assets
Estimated Useful Lives (years)		5 years
Weighted Average Amortization Period (in years)	3 years 4 months 24 days	5 years
Gross Carrying Amount	$ 4,181	$ 521
Accumulated Amortization	878	66
Net Carrying Value	$ 3,303	$ 455
Other | Minimum
Definite-lived intangible assets
Estimated Useful Lives (years)	3 years
Other | Maximum
Definite-lived intangible assets
Estimated Useful Lives (years)	5 years

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Intangible assets
Amortization expense	$ 18,301	$ 10,481	$ 53,262	$ 31,527
Depreciation and amortization expense
Intangible assets
Amortization expense	$ 18,300	$ 10,500	$ 53,300	$ 31,500

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Estimated Aggregate Amortization Expense (Details) $ in Millions	Jan. 31, 2019USD ($)
Estimated aggregate future amortization expense
Expense remainder of fiscal year	$ 17.7
2,020	64.4
2,021	54.6
2,022	45.7
2,023	38.1
Thereafter	$ 170.9

Goodwill and Intangible Asset_6

Goodwill and Intangible Assets - Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Jan. 31, 2019	Apr. 30, 2018
Goodwill and Intangible Assets
Tradenames	$ 61.4	$ 61.4

Long-Term Debt - Components (De

Long-Term Debt - Components (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Apr. 30, 2018
Long-term debt
Carrying value of debt	$ 1,233,850	$ 595,886
Less current portion	40,328	16,284
Long-term debt	1,193,522	579,602
First Lien Term Loan Due 2025
Long-term debt
Carrying value of debt	974,555	563,179
Unamortized discount	2,238	2,536
Deferred financing costs	12,570	6,125
ABL Facility
Long-term debt
Carrying value of debt	137,898
Capital Lease Obligations
Long-term debt
Carrying value of debt	105,489	18,564
Installment notes
Long-term debt
Carrying value of debt	15,908	14,143
Unamortized discount	$ 1,273	$ 1,534
Installment notes | Maximum
Long-term debt
Interest rate	5.00%	5.00%

Long-Term Debt - Acquisition De

Long-Term Debt - Acquisition Debt (Details) - USD ($) $ in Thousands	Jun. 01, 2018	Jun. 07, 2017	Jan. 31, 2019	Jan. 31, 2018
Long-term debt
Loan repayment			$ 571,840	$ 477,616
Write-off of debt discount and deferred financing fees				74
First Lien Term Loan Due 2025
Long-term debt
Loan repayment	$ 571,800	$ 477,600
Second amendment to First Lien Credit Agreement
Long-term debt
Aggregate principal amount		$ 577,600
Write-off of debt discount and deferred financing fees				$ 100
Second amendment to First Lien Credit Agreement | LIBOR
Long-term debt
Margin added to variable rate (as a percent)		3.00%
Variable rate floor (as a percent)		1.00%
Third Amendment
Long-term debt
Aggregate principal amount	$ 996,800
Borrowing interest rate (as a percent)			5.25%
Third Amendment | LIBOR
Long-term debt
Margin added to variable rate (as a percent)	2.75%
Variable rate floor (as a percent)	0.00%
ABL Facility
Long-term debt
Loan repayment		$ 94,000
Borrowing interest rate (as a percent)			4.01%

Long-Term Debt - Asset-Based Le

Long-Term Debt - Asset-Based Lending Facility (Details) - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Long-term debt
Net borrowings	$ 886,896	$ 493,739
ABL Facility
Long-term debt
Maximum amount under the facility	$ 345,000
Borrowing interest rate (as a percent)	4.01%
Available borrowings under the facility	$ 197,300
Net borrowings	137,900
ABL Facility | Swing-line
Long-term debt
Maximum amount under the facility	$ 34,500

Long-Term Debt - Titan Revolvin

Long-Term Debt - Titan Revolving Credit Facility (Details) - Titan Revolving Credit Facility $ in Millions	Jan. 31, 2019CAD ($)	Jan. 31, 2019USD ($)	Jun. 01, 2018CAD ($)	Jun. 01, 2018USD ($)
Debt Instrument [Line Items]
Maximum amount under the facility			$ 30,000,000	$ 22.5
Amount outstanding	$ 0
Available borrowings under the facility		$ 22.5

Long-Term Debt - Capital Leases

Long-Term Debt - Capital Leases (Details) $ in Millions	Jan. 31, 2019USD ($)
Long-Term Debt
Capital lease assets	$ 73.6
Capital lease liabilities	$ 73.6

Long-Term Debt - Maturities (De

Long-Term Debt - Maturities (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Apr. 30, 2018
Debt maturities
2019 (remaining three months)	$ 8,788
2,020	40,674
2,021	39,060
2,022	172,913
2,023	29,571
Thereafter	958,925
Total	1,249,931
First Lien Term Loan Due 2025
Debt maturities
2019 (remaining three months)	2,491
2,020	9,968
2,021	9,968
2,022	9,968
2,023	9,968
Thereafter	947,000
Total	989,363
Long Term Debt
Unamortized discount	2,238	$ 2,536
Deferred financing costs	12,570	6,125
ABL Facility
Debt maturities
2,022	137,898
Total	137,898
Capital Lease Obligations
Debt maturities
2019 (remaining three months)	5,693
2,020	26,343
2,021	25,039
2,022	21,430
2,023	16,019
Thereafter	10,965
Total	105,489
Installment notes
Debt maturities
2019 (remaining three months)	604
2,020	4,363
2,021	4,053
2,022	3,617
2,023	3,584
Thereafter	960
Total	17,181
Long Term Debt
Unamortized discount	$ 1,273	$ 1,534

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		8 Months Ended	9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Dec. 31, 2017	Jan. 31, 2019	Jan. 31, 2018	Apr. 30, 2018
Effective income tax rate (as a percent)				23.90%	22.70%
Federal statutory rate (as a percent)			35.00%
Provisional income tax benefit		$ 7.8			$ 7.8
Income tax benefit adjustment	$ 0.1
Reserve for uncertain tax positions	0			$ 0		$ 0
Domestic
Federal statutory rate (as a percent)				21.00%
Valuation allowance	$ 0.4			$ 0.4		$ 0.4

Stockholders' Equity - Exchange

Stockholders' Equity - Exchangeable Shares and Share Repurchase Program (Details) - USD ($) shares in Millions, $ in Millions	Nov. 30, 2018	Jun. 01, 2018	Jan. 31, 2019
Exchangeable Shares and Share Repurchase Program
Number of shares repurchased			0.7
Shares repurchased, cost			$ 11.5
Remaining amount under repurchase program			$ 63.5
Maximum
Exchangeable Shares and Share Repurchase Program
Shares repurchased, cost	$ 75
Titan
Exchangeable Shares and Share Repurchase Program
Issuance of shares to current shareholders of Titan (in shares)		1.1

Stockholders' Equity - Accumula

Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jan. 31, 2019	Jan. 31, 2019
Stockholders’ Equity
Balance		$ 579,451
Foreign currency translation adjustments	$ (128)	(8,821)
Balance	633,760	633,760
Accumulated Other Comprehensive Income (Loss)
Stockholders’ Equity
Balance		441
Foreign currency translation adjustments		(8,821)
Other comprehensive loss on interest rate cap		(237)
Reclassification to earnings from accumulated other comprehensive income for interest rate cap		728
Balance	$ (7,889)	$ (7,889)

Equity-Based Compensation - Sto

Equity-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018	Apr. 30, 2018
Other disclosures
Equity-based compensation	$ 1,140	$ 430	$ 2,638	$ 1,277
Selling, general and administrative expenses
Other disclosures
Equity-based compensation			$ 2,600	$ 1,300
Stock Options
Number of Options
Outstanding, beginning of the period (in shares)			1,952
Options granted (in shares)			374	0
Options exercised (in shares)			(103)
Options forfeited (in shares)			(41)
Outstanding, end of the period (in shares)	2,182		2,182		1,952
Exercisable at end of period (in shares)	1,724		1,724
Vested and expected to vest at end of period (in shares)	2,173		2,173
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)			$ 14.37
Options granted (in dollars per share)			25.58
Options exercised (in dollars per share)			12.41
Options forfeited (in dollars per share)			27
Outstanding, end of the period (in dollars per share)	$ 16.15		16.15		$ 14.37
Exercisable at end of period (in dollars per share)	13.51		13.51
Vested and expected to vest at end of period (in dollars per share)	$ 16.10		$ 16.10
Other disclosures
Weighted Average Remaining Contractual Life, Outstanding (in years)			6 years 4 months 6 days		6 years 6 months 7 days
Weighted Average Remaining Contractual Life, Exercisable at end of period (in years)			5 years 7 months 17 days
Weighted Average Remaining Contractual Life, Vested and expected to vest at end of period (in years)			6 years 4 months 2 days
Aggregate Intrinsic Value, Outstanding	$ 10,261		$ 10,261		$ 33,209
Aggregate Intrinsic Value, Exercisable at end of period	10,217		10,217
Aggregate Intrinsic Value, Vested and expected to vest at end of period	10,260		10,260
Intrinsic value of options exercised			800	$ 3,700
Unrecognized compensation cost	$ 3,200		$ 3,200
Weighted-average period for recognition of unrecognized compensation expense (in years)			2 years 3 months 18 days

Equity-Based Compensation - Bla

Equity-Based Compensation - Black Scholes Options - Pricing Model (Details) - Stock Options	9 Months Ended
	Jan. 31, 2019$ / shares
Stock options
Volatility (as a percent)	33.71%
Expected life (years)	6 years
Risk-free interest rate (as a percent)	2.87%
Dividend yield (as a percent)	0.00%
Weighted average grant date fair value (in dollars per share)	$ 9.72

Equity-Based Compensation - Res

Equity-Based Compensation - Restricted Stock Units (Details) - Restricted Stock Units $ / shares in Units, shares in Thousands, $ in Millions	9 Months Ended
	Jan. 31, 2019USD ($)$ / sharesshares
Number of Restricted Stock Units
Outstanding, beginning of the period (in shares) | shares	22
Granted (in shares) | shares	188
Vested (in shares) | shares	(7)
Forfeited (in shares) | shares	15
Outstanding, end of the period (in shares) | shares	188
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 37.49
Granted (in dollars per share) | $ / shares	24.87
Vested (in dollars per share) | $ / shares	37.49
Forfeited (in dollars per share) | $ / shares	26.41
Outstanding, end of the period (in dollars per share) | $ / shares	$ 25.72
Unrecognized compensation cost | $	$ 3.7
Weighted-average period for recognition of unrecognized compensation expense (in years)	2 years 1 month 6 days

Stock Appreciation Rights, De_3

Stock Appreciation Rights, Deferred Compensation and Redeemable Noncontrolling Interests (Details) - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Apr. 30, 2018
Equity based compensation arrangements
Long-term liabilities related to plans	$ 11,125		$ 15,707
Selling, general and administrative expenses
Equity based compensation arrangements
Expense related to equity based compensation arrangements	2,200	$ 3,200
Stock Appreciation Rights
Equity based compensation arrangements
Award liability as of beginning of period	21,944
Amounts redeemed	(1,216)
Change in fair value	1,426
Award liability as of end of period	22,154
Current liabilities related to plans	981		308
Long-term liabilities related to plans	$ 21,173		21,636
Settlement period	4 years
Deferred Compensation
Equity based compensation arrangements
Award liability as of beginning of period	$ 2,222
Amounts redeemed	(715)
Change in fair value	118
Award liability as of end of period	1,625
Current liabilities related to plans			133
Long-term liabilities related to plans	$ 1,625		2,089
Settlement period	5 years
Redeemable Noncontrolling Interests
Equity based compensation arrangements
Award liability as of beginning of period	$ 16,170
Amounts redeemed	(4,673)
Change in fair value	661
Award liability as of end of period	12,158
Current liabilities related to plans	1,034		463
Long-term liabilities related to plans	$ 11,124		$ 15,707
Settlement period	5 years

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018	Apr. 30, 2018
Fair Value Measurements
Change in fair value of financial instruments	$ (276)	$ (6,395)	$ (710)
Fair Value, Measurements, Recurring | Level 3
Fair Value Measurements
Stock appreciation rights		22,154		$ 21,944
Deferred compensation		1,625		2,222
Noncontrolling interest holders		12,158		16,170
Contingent consideration		12,406
Interest rate cap | Fair Value, Measurements, Recurring | Level 2
Fair Value Measurements
Derivative assets				543
Forward currency forward
Fair Value Measurements
Change in fair value of financial instruments		(5,700)
Forward currency forward | Fair Value, Measurements, Recurring | Level 2
Fair Value Measurements
Derivative liabilities				$ 5,108
Titan
Fair Value Measurements
Assumed contingent consideration arrangements		12,400
Selling, general and administrative expenses | Titan
Fair Value Measurements
Contingent consideration expense		$ 500

Transactions With Related Par_2

Transactions With Related Parties - Facilities Rental (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Affiliated partnerships or entities | Lease of warehouse facilities | Selling, general and administrative expenses
Transactions with related parties
Rent expense	$ 0.2	$ 0.2	$ 0.6	$ 0.6

Transactions With Related Par_3

Transactions With Related Parties - Purchased Inventories (Details) - Southern Wall Products, Inc. - Inventory purchases - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018	Apr. 30, 2018
Transactions with related parties
Purchases from related party	$ 3	$ 3.3	$ 10	$ 10.5
Accounts payable
Transactions with related parties
Due to SWP	$ 1		$ 1		$ 1.2

Segments - Number (Details)

Segments - Number (Details)	9 Months Ended
	Jan. 31, 2019segmentdivision
Segments
Number of operating segments	7
Number of reportable segments	1
Number of geographic divisions | division	7

Segments - Net Sales, Adjusted

Segments - Net Sales, Adjusted EBITDA and Certain Other Measures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Segment information
Net sales	$ 723,902	$ 585,508	$ 2,335,883	$ 1,875,669
Gross Profit	234,226	195,420	747,192	612,784
Depreciation and Amortization	30,220	16,490	87,329	49,548
Adjusted EBITDA	59,717	42,207	222,134	149,201
Geographic divisions
Segment information
Net sales	717,984	579,974	2,316,732	1,858,259
Gross Profit	232,201	193,329	740,591	606,388
Depreciation and Amortization	29,368	16,252	85,284	48,744
Adjusted EBITDA	59,321	41,658	220,365	147,534
Other.
Segment information
Net sales	5,918	5,534	19,151	17,410
Gross Profit	2,025	2,091	6,601	6,396
Depreciation and Amortization	55	59	168	183
Adjusted EBITDA	396	549	1,769	1,667
Corporate
Segment information
Depreciation and Amortization	$ 797	$ 179	$ 1,877	$ 621

Segments - Reconciliation of Ne

Segments - Reconciliation of Net Income to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Segments
Net income	$ 5,815	$ 19,686	$ 39,377	$ 53,052
Interest expense	19,526	7,871	54,896	23,288
Write-off of debt discount and deferred financing fees				74
Interest income	(10)	(44)	(43)	(93)
Provision (benefit) for income taxes	1,442	(4,488)	12,337	15,555
Depreciation expense	11,919	6,009	34,067	18,021
Amortization expense	18,301	10,481	53,262	31,527
Stock appreciation expense	442	631	1,425	1,863
Redeemable noncontrolling interests	(35)	340	778	1,370
Equity-based compensation	1,140	430	2,638	1,277
Severance and other permitted costs	229	8	5,947	325
Transaction costs (acquisitions and other)	1,066	75	6,660	321
Gain on sale of assets	(118)	(51)	(412)	(648)
Effects of fair value adjustments to inventory		89	4,129	276
Change in fair value of financial instruments		276	6,395	710
Secondary public offering costs		894		1,525
Debt transaction costs			678	758
Adjusted EBITDA	$ 59,717	$ 42,207	$ 222,134	$ 149,201

Segments - Net Sales by Main Pr

Segments - Net Sales by Main Product Lines (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Revenue from external customers
Total net sales	$ 723,902	$ 585,508	$ 2,335,883	$ 1,875,669
Wallboard
Revenue from external customers
Total net sales	297,358	256,413	949,781	829,568
Ceilings
Revenue from external customers
Total net sales	105,219	90,360	339,450	291,716
Steel framing
Revenue from external customers
Total net sales	117,432	96,744	382,304	304,598
Other products
Revenue from external customers
Total net sales	$ 203,893	$ 141,991	$ 664,348	$ 449,787

Segments - Net sales by major g

Segments - Net sales by major geographic area (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019USD ($)$ / $	Jan. 31, 2018USD ($)$ / $	Jan. 31, 2019USD ($)$ / $	Jan. 31, 2018USD ($)$ / $
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	$ 723,902	$ 585,508	$ 2,335,883	$ 1,875,669
Average exchange rates | $ / $	0.7491	0.7895	0.7609	0.7875
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	$ 624,672	$ 585,508	$ 2,021,750	$ 1,875,669
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	$ 99,230		$ 314,133

Segments - Long-lived assets by

Segments - Long-lived assets by major geographic area (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Apr. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 1,352,590	$ 813,909
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	871,596	$ 813,909
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 480,994

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Computation of basic and diluted earnings per share of common stock
Net income	$ 5,815	$ 19,686	$ 39,377	$ 53,052
Less: Net income allocated to participating securities	156		940
Net income attributable to common stockholders	$ 5,659	$ 19,686	$ 38,437	$ 53,052
Basic earnings per common share:
Basic weighted average common shares outstanding (in shares)	40,912	41,036	41,053	41,004
Basic earnings per common share (in dollars per share)	$ 0.14	$ 0.48	$ 0.94	$ 1.29
Diluted earnings per common share:
Basic weighted average common shares outstanding (in shares)	40,912	41,036	41,053	41,004
Add: Common Stock Equivalents	459	1,192	736	1,163
Diluted weighted average common shares outstanding (in shares)	41,371	42,228	41,789	42,167
Diluted earnings per common share (in dollars per share)	$ 0.14	$ 0.47	$ 0.92	$ 1.26

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event - Interest rate swap agreement $ in Millions	Feb. 28, 2019USD ($)
Subsequent Events
Notional amount	$ 500
LIBOR | First Lien Term Loan Due 2025
Subsequent Events
Fixed interest rate	2.46%