Income Taxes - Summary of Effective Income Tax Expense Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 25, 2020	Apr. 27, 2019	Apr. 28, 2018
Income Tax Disclosure [Abstract]
Tax at U.S. statutory rate	$ (123,987)	$ 22,306	$ 54,674
State tax provision, net of federal benefit	(466)	3,492	4,650
Effect of foreign taxes	7,277	2,728	(186)
Goodwill impairment	107,999	0	0
Legal settlement	11,088	0	0
ESOP	(2,393)	(2,465)	(4,036)
Other permanent differences	1,533	1,074	(728)
Tax reform	0	(2,686)	(76,648)
Other	(2,091)	(1,097)	563
Income tax (benefit) expense	$ (1,040)	$ 23,352	$ (21,711)