General - Computation of Basic and Diluted Earnings Per Share (EPS) (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Oct. 29, 2016	Oct. 31, 2015	Oct. 29, 2016	Oct. 31, 2015
Earnings Per Share [Abstract]
Denominator for basic earnings per share – weighted average shares (in shares)	95,290	98,525	95,510	98,981
Effect of dilutive securities - stock options, restricted stock and stock purchase plans (in shares)	614	660	628	693
Denominator for diluted earnings per share – weighted average shares (in shares)	95,904	99,185	96,138	99,674