General - Computation of Basic and Diluted Earnings Per Share (EPS) (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Oct. 27, 2018	Oct. 28, 2017	Oct. 27, 2018	Oct. 28, 2017
Earnings Per Share [Abstract]
Denominator for basic earnings per share – weighted average shares (in shares)	92,683	92,722	92,606	93,037
Effect of dilutive securities - stock options, restricted stock and stock purchase plans (in shares)	606	629	538	646
Denominator for diluted earnings per share – weighted average shares (in shares)	93,289	93,351	93,144	93,683