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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 25, 2014
Oct. 26, 2013
Oct. 25, 2014
Oct. 26, 2013
Income Taxes        
Effective tax rate (as a percent) 35.30% 32.50% 35.30% 33.60%
Statutory tax rate (as a percent) 35.00%   35.00%  
Tax benefit from release of valuation allowance   $ 0.9   $ 0.9
Effective tax rate before release of valuation allowance (as a percent)   36.00%   35.80%
Net liability for uncertain income tax positions $ 1.1   $ 1.1