Income Taxes - Summary of Effective Income Tax Expense Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 29, 2017	Apr. 30, 2016	Apr. 25, 2015
Income Tax Disclosure [Abstract]
Tax at U.S. statutory rate	$ 87,807	$ 105,593	$ 96,012
State tax provision, net of federal benefit	5,217	7,364	6,479
Effect of foreign taxes	(2,602)	(1,195)	(1,806)
Permanent differences	(6,861)	(3,693)	(5,363)
Tax on dividends, net of foreign tax credit	(2,406)	12,300	0
Other	(4,062)	(4,360)	(1,087)
Income tax expense	$ 77,093	$ 116,009	$ 94,235