Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Cash flows from operating activities:
Net income (loss)	$ 48,886	$ 12,564	$ (11,697)
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization of property and equipment	25,565	26,667	32,208
Accretion and amortization of debt discount and deferred financing fees	9,793	3,438	3,374
Amortization of intangible assets	43,675	37,548	31,957
Provision for losses on accounts and notes receivable	(122)	(1,032)	(233)
Provision for obsolescence of inventory	425	80	1,077
Decrease in fair value of contingent consideration	(1,484)
Equity-based compensation	3,142	4,733	9,012
(Gain)/ loss on sale or impairment of assets	(336)	(645)	1,089
Loss on fair value of financial instruments			2,494
Changes in assets and liabilities, net of effects of acquisitions:
Trade accounts and notes receivable	(20,400)	(27,338)	(11,649)
Inventories	(18,390)	(699)	(4,610)
Accounts payable	(3,763)	1,055	(3,655)
Deferred income tax	(20,114)	(20,499)	(21,664)
Prepaid expenses and other assets	(412)	(4,682)	1,989
Accrued compensation and employee benefits	4,440	3,454	8,204
Accrued expenses and liabilities	626	5,551	9,170
Liabilities to noncontrolling interest holders	1,133	446	1,862
Income tax receivable / payable	(5,956)	7,106	(905)
Cash provided by operating activities	66,708	47,747	48,023
Cash flows from investing activities:
Purchases of property and equipment	(11,083)	(7,692)	(13,940)
Proceeds from sale of assets	3,995	9,847	3,807
Purchase of financial instruments			(4,638)
Acquisition of businesses, net of cash acquired	(150,428)	(120,195)	(67,696)
Cash used in investing activities	(157,516)	(118,040)	(82,467)
Cash flows from financing activities:
Repayments on the revolving credit facility	(1,011,925)	(697,144)	(303,099)
Borrowings from the revolving credit facility	1,013,365	782,104	320,049
Payments of principal on long-term debt	(4,584)	(3,931)	(3,927)
Principal repayments of capital lease obligations	(5,208)	(4,249)	(4,327)
Proceeds from issuance of common stock in initial public offering, net of underwriting discounts	156,941
Proceeds from sales of common stock			5,370
Proceeds from term loan amendment	481,225
Debt issuance costs	(2,637)	(391)
Stock repurchases		(5,827)
Exercise of stock options	345	6,519
Cash provided by financing activities	86,297	77,081	14,066
(Decrease) increase in cash and cash equivalents	(4,511)	6,788	(20,378)
Balance, beginning of period	19,072	12,284	32,662
Balance, end of period	14,561	19,072	12,284
Supplemental cash flow disclosures:
Cash paid for income taxes	49,163	26,067	16,111
Cash paid for interest	26,443	34,557	31,720
Supplemental schedule of noncash activities:
Assets acquired under capital lease	9,410	7,542	5,211
Change in fair value of derivative instrument	184	1,889
Issuance of installment notes associated with equity-based compensation liability awards	5,352	1,557	1,644
Increase in other liabilities due to transition guidance		3,208
Increase to other assets and decrease to property and equipment		833	1,837
Non cash property and equipment adjustments		110	115
Increase (decrease) increase in insurance claims payable and insurance recoverable	1,876	$ (25,715)	$ 6,350
Second Lien Term Loan due 2022
Cash flows from financing activities:
Repayment of term loan / Repayments on term loan amendment	(160,000)
Incremental First Lien Term Commitments Amendment
Cash flows from financing activities:
Repayment of term loan / Repayments on term loan amendment	$ (381,225)