Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 29, 2017	Apr. 30, 2016	Apr. 25, 2015
Current:
Federal	$ 72,339	$ 105,104	$ 73,004
Foreign	9,100	11,690	11,764
State	9,367	15,249	9,007
Total current	90,806	132,043	93,775
Deferred:
Federal	(11,802)	(14,308)	497
Foreign	(28)	323	44
State	(1,883)	(2,049)	(81)
Total deferred	(13,713)	(16,034)	460
Income tax expense	$ 77,093	$ 116,009	$ 94,235