Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 25, 2015	Apr. 26, 2014
Current:
Federal	$ 105,104	$ 73,004	$ 66,747
Foreign	11,690	11,764	8,954
State	15,249	9,007	8,697
Total current	132,043	93,775	84,398
Deferred:
Federal	(14,308)	497	5,225
Foreign	323	44	(260)
State	(2,049)	(81)	568
Total deferred	(16,034)	460	5,533
Income tax expense	$ 116,009	$ 94,235	$ 89,931