Summary of Significant Accounting Policies - Weighted Average Shares Outstanding (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Oct. 28, 2016	Oct. 23, 2015	Oct. 28, 2016	Oct. 23, 2015
Accounting Policies [Abstract]
Basic (in shares)	19,825	22,115	19,807	22,421
Dilutive shares (in shares)	139	118	175	151
Diluted (in shares)	19,964	22,233	19,982	22,572