Summary of Significant Accounting Policies - Weighted Average Shares Outstanding (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Jan. 22, 2016	Jan. 23, 2015	Jan. 22, 2016	Jan. 23, 2015
Accounting Policies [Abstract]
Basic (in shares)	20,692	23,515	21,845	23,487
Dilutive shares (in shares)	111	231	144	230
Diluted (in shares)	20,803	23,746	21,989	23,717