Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 24, 2015	Oct. 25, 2014	Oct. 24, 2015	Oct. 25, 2014
Income Taxes
Effective tax rate (as a percent)	36.20%	35.30%	36.10%	35.30%
Statutory tax rate (as a percent)			35.00%
Net liability for uncertain income tax positions	$ 0.9		$ 0.9