General - Computation of Basic and Diluted Earnings Per Share (EPS) (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 28, 2017	Jan. 30, 2016
Earnings Per Share [Abstract]
Denominator for basic earnings per share – weighted average shares (in shares)	94,737	95,335	95,252	97,809
Effect of dilutive securities - stock options, restricted stock and stock purchase plans (in shares)	622	595	663	679
Denominator for diluted earnings per share – weighted average shares (in shares)	95,359	95,930	95,915	98,488