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Employee Benefits - Net Periodic Pension Cost and Retirement Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Components of net periodic pension cost      
Other $ 284 $ 360 $ 51
Total retirement costs (excluding non-qualified defined benefit retirement plan) 48,494 13,005 12,702
401(k)      
Components of net periodic pension cost      
Defined contribution plan cost 9,128 7,093 7,124
PCRP      
Components of net periodic pension cost      
Defined contribution plan cost 3,084 1,347 1,488
Defined benefit pension plan for factory hourly employees (funded)      
Components of net periodic pension cost      
Service cost 851 1,316 1,278
Interest cost 4,464 4,587 4,681
Expected return on plan assets (4,544) (4,818) (4,978)
Net amortization and deferral 2,556 3,120 3,058
Pension termination charge 32,671    
Net periodic pension cost $ 35,998 $ 4,205 $ 4,039