CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND OTHER COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 27, 2018	Jan. 28, 2017	Jan. 27, 2018	Jan. 28, 2017
Income Statement [Abstract]
Net sales	$ 1,375,222	$ 1,397,418	$ 4,065,074	$ 4,148,095
Cost of sales	1,080,486	1,067,657	3,155,547	3,182,196
Gross profit	294,736	329,761	909,527	965,899
Operating expenses	244,690	283,207	730,889	774,126
Operating income from continuing operations	50,046	46,554	178,638	191,773
Other income (expense):
Other income, net	2,096	994	4,768	4,980
Interest expense	(11,783)	(11,400)	(34,454)	(31,659)
Income from continuing operations before taxes	40,359	36,148	148,952	165,094
Income tax expense (benefit)	(68,596)	8,379	(31,094)	52,663
Net income from continuing operations	108,955	27,769	180,046	112,431
Net loss from discontinued operations	0	(3,229)	0	(3,229)
Net income	$ 108,955	$ 24,540	$ 180,046	$ 109,202
Basic earnings (loss) per share:
Continuing operations (in USD per share)	$ 1.18	$ 0.29	$ 1.94	$ 1.18
Discontinued operations (in USD per share)	0.00	(0.03)	0.00	(0.03)
Net basic earnings per share (in USD per share)	1.18	0.26	1.94	1.15
Diluted earnings (loss) per share:
Continuing operations (in USD per share)	1.18	0.29	1.93	1.17
Discontinued operations (in USD per share)	0.00	(0.03)	0.00	(0.03)
Net diluted earning per share (in USD per share)	$ 1.18	$ 0.26	$ 1.93	$ 1.14
Weighted average shares:
Basic (in shares)	91,949	94,737	92,674	95,252
Diluted (in shares)	92,609	95,359	93,323	95,915
Dividends declared per common share (in USD per share)	$ 0.26000	$ 0.24	$ 0.78	$ 0.72
Comprehensive income
Net income	$ 108,955	$ 24,540	$ 180,046	$ 109,202
Foreign currency translation gain (loss)	16,475	6,082	24,594	(28,176)
Cash flow hedges, net of tax	437	437	1,312	1,307
Comprehensive income	$ 125,867	$ 31,059	$ 205,952	$ 82,333