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Employee Benefits - Net Periodic Pension Cost and Retirement Costs (Details) - USD ($)
 12 Months Ended
Apr. 24, 2021
Apr. 25, 2020
Apr. 27, 2019
Retirement Benefits [Abstract]      
Service cost     $ 851,000
Interest cost     4,464,000
Expected return on plan assets     (4,544,000)
Net amortization     2,556,000
Pension termination charge $ 0 $ (1,900,000) 32,671,000
Net periodic pension cost $ 0 $ 0 $ 35,998,000