Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Jan. 23, 2016	Jan. 25, 2015	Jan. 24, 2015	Oct. 24, 2015	Jan. 23, 2016	Jan. 24, 2015
Income Taxes
Effective tax rate (as a percent)	36.20%	34.00%	34.80%	36.10%	36.10%	34.80%
Statutory tax rate (as a percent)					35.00%
Net liability for uncertain income tax positions	$ 0.9				$ 0.9