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Retirement and Welfare Plans - Net Periodic Pension Cost and Retirement Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Components of net periodic pension cost      
Other $ 360 $ 51 $ 318
Total retirement costs (excluding non-qualified defined benefit retirement plan) 13,005 12,702 14,363
401(k)      
Components of net periodic pension cost      
Defined contribution plan cost 7,093 7,124 6,657
PCRP      
Components of net periodic pension cost      
Defined contribution plan cost 1,347 1,488 3,088
Defined benefit pension plan for factory hourly employees (funded)      
Components of net periodic pension cost      
Service cost 1,316 1,278 1,358
Interest cost 4,587 4,681 4,938
Expected return on plan assets (4,818) (4,978) (4,997)
Net amortization and deferral 3,120 3,058 3,001
Net periodic pension cost $ 4,205 $ 4,039 $ 4,300