CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Jul. 28, 2018	Jul. 29, 2017
Statement of Cash Flows [Abstract]
Net income (loss)	$ (4,509)	$ 30,847
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	10,840	11,433
Amortization	10,017	9,671
Bad debt expense	1,705	1,419
Non-cash employee compensation	6,357	8,656
Deferred income taxes	862	0
Change in assets and liabilities, net of acquired	180,189	(108,054)
Net cash provided by (used in) operating activities	205,461	(46,028)
Investing activities:
Additions to property and equipment	(10,184)	(6,674)
Collection of deferred purchase price receivables	15,509	12,191
Other investing activities	2,244	0
Net cash provided by investing activities	7,569	5,517
Financing activities:
Dividends paid	(25,289)	(25,210)
Repurchases of common stock	0	(37,500)
Retirement of long-term debt	(176,633)	0
Draw on revolving credit	16,000	104,000
Other financing activities	2,117	1,916
Net cash provided by (used in) financing activities	(183,805)	43,206
Effect of exchange rate changes on cash	(733)	2,125
Net change in cash and cash equivalents	28,492	4,820
Cash and cash equivalents at beginning of period	62,984	94,959
Cash and cash equivalents at end of period	$ 91,476	$ 99,779