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Stock-Based Compensation - Stock Options (Details) - Stock Options
6 Months Ended
Oct. 26, 2019
$ / shares
shares
Stock-Based Compensation  
Shares granted (in shares) | shares 248,662
Fair value assumptions  
Risk-free interest rate 2.19%
Dividend rate 1.72%
Expected life in years 5 years
Stock price volatility 34.27%
Fair value per share (in dollars per share) | $ / shares $ 7.94
Minimum  
Stock-Based Compensation  
Vesting period 1 year
Period of recognition of expenses for retirement-eligible employees from the grant date 10 months
Maximum  
Stock-Based Compensation  
Vesting period 4 years