Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Cash flows from operating activities:
Net income	$ 33,366	$ 26,387
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization of property and equipment	12,013	12,930
Write-off, accretion and amortization of debt discount and deferred financing fees	1,412	8,264
Amortization of intangible assets	21,045	20,233
Provision for losses on accounts and notes receivable	873	(230)
Provision for obsolescence of inventory	483	(85)
Equity-based compensation	436	1,499
(Gain) on sale of assets	(598)	(130)
Changes in assets and liabilities, net of effects of acquisitions:
Trade accounts and notes receivable	(21,837)	(19,316)
Inventories	(7,366)	(13,444)
Accounts payable	14,590	606
Deferred income taxes	(5,437)	(12,373)
Prepaid expenses and other assets	(2,357)	(3,105)
Accrued compensation and employee benefits	(16,352)	(13,783)
Accrued expenses and liabilities	3,055	3,851
Liabilities to noncontrolling interest holders	(2,129)	907
Income tax receivable / payable	(1,834)	(11,520)
Cash provided by operating activities	29,363	691
Cash flows from investing activities:
Purchases of property and equipment	(8,442)	(5,024)
Proceeds from sale of assets	1,928	1,319
Acquisition of businesses, net of cash acquired	(18,375)	(139,939)
Cash used in investing activities	(24,889)	(143,644)
Cash flows from financing activities:
Repayments on the revolving credit facility	(443,920)	(635,732)
Borrowings from the revolving credit facility	352,567	686,216
Payments of principal on long-term debt	(2,888)	(2,178)
Principal repayments of capital lease obligations	(2,936)	(2,492)
Proceeds from issuance of common stock in initial public offering, net of underwriting discounts		156,941
Borrowings from term loan amendment	577,616	481,225
Debt issuance costs	(636)	(2,487)
Payments for taxes related to net share settlement of equity awards	(1,441)
Cash provided by financing activities	746	140,268
Increase (decrease) in cash and cash equivalents	5,220	(2,685)
Balance, beginning of period	14,561	19,072
Balance, end of period	19,781	16,387
Supplemental cash flow disclosures:
Cash paid for income taxes	28,455	30,790
Cash paid for interest	14,104	13,163
Supplemental schedule of noncash activities:
Assets acquired under capital lease	6,378	5,180
Issuance of installment notes associated with equity-based compensation liability awards	11,898	5,353
Second Lien Term Loan due 2022
Cash flows from financing activities:
Repayment of term loan / Repayment of term loan amendment		(160,000)
Second amendment to First Lien Credit Agreement
Cash flows from financing activities:
Repayment of term loan / Repayment of term loan amendment	$ (477,616)	$ (381,225)