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Retirement and Welfare Plans - Hourly Plan, Funded Status and Balance Sheet Amounts (Details) - Defined benefit pension plan for factory hourly employees (funded) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Change in benefit obligation      
Benefit obligation at beginning of year $ 114,185 $ 116,371  
Service cost 1,316 1,278 $ 1,358
Interest cost 4,587 4,681 4,938
Actuarial (gain) loss (5,154) 14  
Benefits paid (5,694) (7,728)  
Administrative expenses (455) (431)  
Benefit obligation at end of year 108,785 114,185 116,371
Change in plan assets      
Fair value of plan assets at beginning of year 109,012 112,484  
Actual return on plan assets 2,211 2,387  
Employer contributions 2,000 2,300  
Benefits paid (5,694) (7,728)  
Administrative expenses (455) (431)  
Fair value of plan assets at end of year 107,074 109,012 $ 112,484
Funded status (1,711) (5,173)  
Other long-term liabilities $ (1,711) $ (5,173)