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Retirement and Welfare Plans - Non-qualified Plan (Details) - Non-qualified defined benefit retirement plan - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2016
Apr. 25, 2015
Retirement and Welfare    
Total cost recognized $ 0.9 $ 0.8
Actuarial gain (loss) recognized in accumulated other comprehensive loss (0.4) (1.7)
Benefit payments 1.1 $ 1.1
Future benefit payments expected annually for the next ten years $ 1.1  
Discount rate used to determine benefit obligations (as a percent) 3.70% 3.90%
Other long-term liabilities    
Retirement and Welfare    
Plan obligations $ 17.4 $ 17.5