Employee Benefits - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Oct. 24, 2020	Apr. 24, 2021	Apr. 25, 2020	Apr. 27, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension termination (refund)/charge		$ 0	$ (1,900,000)	$ 32,671,000
Pre-tax refund from insurance	$ 1,900,000
Net periodic pension cost		$ 0	$ 0	35,998,000
401(k) Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Additional expense from increase in matching contributions				$ 1,700,000
Minimum | Performance Compensation Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Period to elect to receive benefit payments		5 years
Maximum | Performance Compensation Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Period to elect to receive benefit payments		20 years