Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Cash flows from operating activities:
Net income	$ 53,958	$ 33,562
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	58,793	57,109
Write-off and amortization of debt discount and debt issuance costs	2,368	1,665
Provision for losses on accounts and notes receivable	375	81
Provision for obsolescence of inventory	195	229
Effects of fair value adjustments to inventory	151	4,129
Increase in fair value of contingent consideration	380	460
Equity-based compensation	5,591	3,204
Gain on sale and disposal of assets	(742)	(294)
Change in fair value of financial instruments		6,395
Deferred income taxes	(2,380)	(5,145)
Changes in assets and liabilities net of effects of acquisitions:
Trade accounts and notes receivable	(29,932)	(45,355)
Inventories	1,800	(4,553)
Prepaid expenses and other assets	1,573	(343)
Accounts payable	(5,486)	9,516
Accrued compensation and employee benefits	(12,974)	(9,550)
Derivative liability		(10,778)
Other accrued expenses and liabilities	(3,743)	5,325
Cash provided by operating activities	69,927	45,657
Cash flows from investing activities:
Purchases of property and equipment	(14,637)	(9,156)
Proceeds from sale of assets	1,056	638
Acquisition of businesses, net of cash acquired	(10,633)	(578,917)
Cash used in investing activities	(24,214)	(587,435)
Cash flows from financing activities:
Repayments on the revolving credit facility	(558,906)	(469,647)
Borrowings from the revolving credit facility	562,698	623,117
Payments of principal on long-term debt	(54,984)	(4,984)
Payments of principal on finance lease obligations	(12,310)	(8,820)
Borrowings from term loan amendment		996,840
Repayments from term loan amendment		(571,840)
Debt issuance costs	(1,286)	(7,933)
Proceeds from exercises of stock options	6,761	973
Other financing activities	1,022	873
Cash (used in) provided by financing activities	(57,005)	558,579
Effect of exchange rates on cash and cash equivalents	223	(360)
(Decrease) increase in cash and cash equivalents	(11,069)	16,441
Cash and cash equivalents, beginning of period	47,338	36,437
Cash and cash equivalents, end of period	36,269	52,878
Supplemental cash flow disclosures:
Cash paid for income taxes	25,642	10,469
Cash paid for interest	$ 33,654	$ 30,966