Income Taxes - Summary of Effective Income Tax Expense Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Income Tax Disclosure [Abstract]
Tax at U.S. statutory rate	$ 54,674	$ 87,807	$ 105,593
State tax provision, net of federal benefit	4,650	5,217	7,364
Effect of foreign taxes	(186)	(2,602)	(1,195)
Permanent differences	(4,219)	(6,861)	(3,693)
Tax on dividends, net of foreign tax credit	0	(2,406)	12,300
Tax reform	(76,648)	0	0
Other	18	(4,062)	(4,360)
Income tax expense	$ (21,711)	$ 77,093	$ 116,009