Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Cash flows from operating activities:
Net income	$ 71,814	$ 64,837
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	79,904	88,215
Write-off and amortization of debt discount and debt issuance costs	2,257	2,964
Equity-based compensation	10,318	6,345
Gain on disposal and impairment of assets	(529)	(872)
Deferred income taxes	(9,645)	174
Other items, net	105	2,387
Changes in assets and liabilities net of effects of acquisitions:
Trade accounts and notes receivable	1,352	16,561
Inventories	(24,391)	317
Prepaid expenses and other assets	1,040	4,210
Accounts payable	(58,104)	(30,420)
Accrued compensation and employee benefits	(11,932)	(11,729)
Other accrued expenses and liabilities	6,307	(7,622)
Cash provided by operating activities	68,496	135,367
Cash flows from investing activities:
Purchases of property and equipment	(17,857)	(20,884)
Proceeds from sale of assets	1,233	1,299
Acquisition of businesses, net of cash acquired	(51)	(20,803)
Cash used in investing activities	(16,675)	(40,388)
Cash flows from financing activities:
Repayments on revolving credit facilities	(102,189)	(794,623)
Borrowings from revolving credit facilities	14,750	760,444
Payments of principal on long-term debt	(7,476)	(57,476)
Payments of principal on finance lease obligations	(22,662)	(17,971)
Repurchases of common stock	(2,000)
Debt issuance costs		(1,286)
Proceeds from exercises of stock options	3,656	8,280
Payments for taxes related to net share settlement of equity awards	(807)	(532)
Other financing activities	2,076	1,793
Cash used in financing activities	(114,652)	(101,371)
Effect of exchange rates on cash and cash equivalents	2,495	3
Decrease in cash and cash equivalents	(60,336)	(6,389)
Cash and cash equivalents, beginning of period	210,909	47,338
Cash and cash equivalents, end of period	150,573	40,949
Supplemental cash flow disclosures:
Cash paid for income taxes	31,942	30,199
Cash paid for interest	$ 38,114	$ 49,224