Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Cash flows from operating activities:
Net income	$ 33,562	$ 33,366
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	57,109	33,058
Write-off and amortization of debt discount and debt issuance costs	1,665	1,412
Provision for losses on accounts and notes receivable	81	873
Provision for obsolescence of inventory	229	483
Effects of fair value adjustments to inventory	4,129	187
Increase in fair value of contingent consideration	460
Equity-based compensation	3,204	3,019
Gain on sale and disposal of assets	(294)	(598)
Change in fair value of financial instruments	6,395	434
Changes in assets and liabilities net of effects of acquisitions:
Trade accounts and notes receivable	(45,355)	(21,837)
Inventories	(4,553)	(7,553)
Prepaid expenses and other assets	(343)	(5,805)
Accounts payable	9,516	14,590
Accrued compensation and employee benefits	(9,550)	(16,352)
Derivative liability	(10,778)
Other accrued expenses and liabilities	5,325	2,170
Deferred income taxes	(5,145)	(5,437)
Cash provided by operating activities	45,657	32,010
Cash flows from investing activities:
Purchases of property and equipment	(9,156)	(8,442)
Proceeds from sale of assets	638	1,928
Acquisition of businesses, net of cash acquired	(578,917)	(18,375)
Cash used in investing activities	(587,435)	(24,889)
Cash flows from financing activities:
Repayments on the revolving credit facility	(469,647)	(443,920)
Borrowings from the revolving credit facility	623,117	352,567
Payments of principal on long-term debt	(4,984)	(2,888)
Payments of principal on capital lease obligations	(8,820)	(2,936)
Borrowings from term loan	996,840	577,616
Repayments of term loan	(571,840)	(477,616)
Debt issuance costs	(7,933)	(3,283)
Proceeds from exercises of stock options	973
Other financing activities	873	(1,441)
Cash provided by (used in) financing activities	558,579	(1,901)
Effect of exchange rates on cash and cash equivalents	(360)
Increase in cash and cash equivalents	16,441	5,220
Cash and cash equivalents, beginning of period	36,437	14,561
Cash and cash equivalents, end of period	52,878	19,781
Supplemental cash flow disclosures:
Cash paid for income taxes	10,469	28,455
Cash paid for interest	30,966	14,104
Supplemental schedule of noncash activities:
Assets acquired under capital lease	91,005	6,378
Issuance of installment notes associated with equity-based compensation liability awards	$ 4,001	$ 11,898