Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Cash flows from operating activities:
Net income	$ 8,650	$ 15,343
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	26,322	16,345
Write-off and amortization of debt discount and debt issuance costs	825	734
Provision for losses on accounts and notes receivable	148	849
Provision for obsolescence of inventory	(22)	371
Effects of fair value adjustments to inventory	4,129
Increase in fair value of contingent consideration	229
Equity-based compensation	1,269	1,178
Gain on sale and disposal of assets	(121)	(390)
Change in fair value of financial instruments	6,019	196
Changes in assets and liabilities net of effects of acquisitions:
Trade accounts and notes receivable	(40,974)	(12,913)
Inventories	(20,943)	(3,318)
Prepaid expenses and other assets	416	(2,996)
Accounts payable	(1,696)	9,506
Accrued compensation and employee benefits	(22,945)	(27,694)
Derivative liability	(10,778)
Other accrued expenses and current liabilities	2,219	14,026
Deferred income taxes	(571)	(2,712)
Cash (used in) provided by operating activities	(47,824)	8,525
Cash flows from investing activities:
Purchases of property and equipment	(3,793)	(5,511)
Proceeds from sale of assets	266	1,424
Acquisition of businesses, net of cash acquired	(575,499)	(3,124)
Cash used in investing activities	(579,026)	(7,211)
Cash flows from financing activities:
Repayments on the revolving credit facility	(176,769)	(257,382)
Borrowings from the revolving credit facility	392,170	167,429
Payments of principal on long-term debt	(2,492)	(1,444)
Payments of principal on capital lease obligations	(3,998)	(1,434)
Borrowings from term loan	996,840	577,616
Repayments of term loan	(571,840)	(477,616)
Debt issuance costs	(7,933)	(3,308)
Proceeds from exercises of stock options	431
Other financing activities	873
Cash provided by financing activities	627,282	3,861
Effect of exchange rates on cash and cash equivalents	(4)
Increase in cash and cash equivalents	428	5,175
Cash and cash equivalents, beginning of period	36,437	14,561
Cash and cash equivalents, end of period	36,865	19,736
Supplemental cash flow disclosures:
Cash paid for income taxes	958	1,787
Cash paid for interest	10,980	6,792
Supplemental schedule of noncash activities:
Assets acquired under capital lease	79,139	2,957
Issuance of installment notes associated with equity-based compensation liability awards	2,645
Increase in insurance claims payable and insurance recoverable	$ 2,231	$ 1,590