Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Cash flows from operating activities:
Net income	$ 26,387	$ 5,836
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization of property and equipment	12,930	13,749
Accretion and amortization of debt discount and deferred financing fees	8,264	1,708
Amortization of intangible assets	20,233	17,589
Provision for losses on accounts and notes receivable	(230)	328
Provision for obsolescence of inventory	(85)	39
Equity-based compensation	1,499	2,669
Net (gain) loss on sale or impairment of assets	(130)	281
Deferred income tax benefit	(12,373)	(11,089)
Prepaid expenses and other assets	(3,105)	(4,484)
Accrued compensation and employee benefits	(13,783)	(18,170)
Other accrued expenses and liabilities	3,851	8,366
Liabilities to noncontrolling interest holders	907	1,030
Income tax receivable / payable	(11,520)	2,562
Total net income and adjustments	32,845	20,414
Changes in primary working capital components, net of acquisitions:
Trade accounts and notes receivable	(19,316)	(23,969)
Inventories	(13,444)	(247)
Accounts payable	606	1,475
Cash provided by (used in) operating activities	691	(2,327)
Cash flows from investing activities:
Purchases of property and equipment	(5,024)	(2,670)
Proceeds from sale of assets	1,319	6,089
Acquisition of businesses, net of cash acquired	(135,613)	(859)
Cash (used in) provided by investing activities	(139,318)	2,560
Cash flows from financing activities:
Repayments on the revolving credit facility	(635,732)	(305,358)
Borrowings from the revolving credit facility	686,216	309,902
Payments of principal on long-term debt	(2,178)	(1,981)
Principal repayments of capital lease obligations	(2,492)	(2,096)
Proceeds from issuance of common stock in initial public offering, net of offering costs	156,941
Proceeds from term loan amendment	481,225
Debt issuance costs on term loan amendment	(2,487)
Stock repurchases		(5,827)
Exercise of stock options		5,412
Payments of contingent considerations	(4,326)	(3,149)
Cash provided by (used in) financing activities	135,942	(3,097)
Decrease in cash and cash equivalents	(2,685)	(2,864)
Balance, beginning of period	19,072	12,284
Balance, end of period	16,387	9,420
Supplemental cash flow disclosures:
Cash paid for income taxes	30,790	14,219
Cash paid for interest	13,163	16,570
Supplemental schedule of noncash activities:
Assets acquired under capital lease	5,180	3,191
Change in fair value of derivative instrument	(187)	1,097
Issuance of installment notes associated with equity-based compensation liability awards	5,353	1,157
Increase (decrease) increase in insurance claims payable and insurance recoverable	2,106	$ (25,350)
First Lien Term Loan due 2021
Cash flows from financing activities:
Repayment of term loan	(381,225)
Second Lien Term Loan due 2022
Cash flows from financing activities:
Repayment of term loan	$ (160,000)