Income Taxes - Summary of Effective Income Tax Expense Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 25, 2015	Apr. 26, 2014
Income Tax Disclosure [Abstract]
Tax at U.S. statutory rate	$ 105,593	$ 96,012	$ 91,442
State tax provision, net of federal benefit	7,364	6,479	6,554
Effect of foreign taxes	(1,195)	(1,806)	(2,078)
Permanent differences	(3,693)	(5,363)	(4,835)
Tax on dividends, net of foreign tax credit	12,300	0	0
Other	(4,360)	(1,087)	(1,152)
Income tax expense	$ 116,009	$ 94,235	$ 89,931