Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Share (Details) - shares shares in Thousands	12 Months Ended
	Apr. 29, 2017	Apr. 30, 2016	Apr. 25, 2015
Earnings Per Share [Abstract]
Denominator for basic earnings per share – weighted average shares (in shares)	94,897	97,222	98,989
Effect of dilutive securities – stock options, restricted stock and stock purchase plans (in shares)	670	680	705
Denominator for diluted earnings per share – adjusted weighted average shares (in shares)	95,567	97,902	99,694