Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Cash flows from operating activities:
Net income	$ 23,381	$ 56,002	$ 62,971
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	116,533	117,459	65,530
Impairment of goodwill	63,074
Write-off and amortization of debt discount and debt issuance costs	4,541	3,332	2,851
Provision for losses on accounts and notes receivable	1,602	617	(622)
Provision for obsolescence of inventory	333	432	106
Effects of fair value adjustments to inventory	575	4,176	324
Increase in fair value of contingent consideration	1,600	759	195
Equity-based compensation	8,970	7,643	5,745
Loss (gain) on disposal and impairment of assets	658	(525)	(509)
Change in fair value of financial instruments		6,395	6,125
Deferred income taxes	926	(17,487)	(16,224)
Changes in assets and liabilities net of effects of acquisitions:
Trade accounts and notes receivable	41,424	(13,586)	(11,752)
Inventories	(4,579)	5,137	(35,098)
Prepaid expenses and other assets	6,623	(4,842)	(3,109)
Accounts payable	40,290	26,816	11,365
Accrued compensation and employee benefits	4,740	6,631	(236)
Other accrued expenses and liabilities	(7,612)	(5,344)	3,601
Cash provided by operating activities	303,079	193,615	91,263
Cash flows from investing activities:
Purchases of property and equipment	(25,193)	(18,770)	(23,741)
Proceeds from sale of assets	2,229	1,170	2,865
Acquisition of businesses, net of cash acquired	(24,136)	(583,092)	(28,333)
Cash used in investing activities	(47,100)	(600,692)	(49,209)
Cash flows from financing activities:
Repayments on the revolving credit facility	(837,424)	(937,176)	(617,230)
Borrowings from the revolving credit facility	880,698	981,148	513,878
Payments of principal on long-term debt	(109,968)	(9,968)	(5,776)
Payments of principal on finance lease obligations	(25,275)	(19,474)	(6,132)
Borrowings from term loan		996,840	577,616
Repayment of term loan		(571,840)	(477,616)
Repurchases of common stock		(16,520)
Payments for contingent consideration	(11,133)
Debt issuance costs	(1,286)	(7,933)	(3,283)
Proceeds from exercises of stock options	11,793	2,538	477
Payments for taxes related to net share settlement of equity awards	(532)	(50)	(1,441)
Other financing activities	1,793	1,405	(671)
Cash (used in) provided by financing activities	(91,334)	418,970	(20,178)
Effect of exchange rates on cash and cash equivalents	(1,074)	(992)
Increase in cash and cash equivalents	163,571	10,901	21,876
Cash and cash equivalents, beginning of period	47,338	36,437	14,561
Cash and cash equivalents, end of period	210,909	47,338	36,437
Supplemental cash flow disclosures:
Cash paid for income taxes	29,761	19,351	38,954
Cash paid for interest	63,745	66,435	28,613
Supplemental schedule of noncash activities:
Assets acquired under finance lease	50,484	111,826	9,086
Issuance of installment notes associated with equity-based compensation liability awards	5,163	5,356	12,433
(Decrease) increase in insurance claims payable and insurance recoverable	$ (634)	$ 619	$ (2,362)