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