Shareholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended
	Jul. 30, 2016	Apr. 30, 2016	Oct. 20, 2015	Aug. 01, 2015
Class of Stock [Line Items]
Stock repurchased, shares	830,583
Stock repurchased, value	$ 9,743,000
Stock repurchase program, remaining authorized repurchase amount	$ 13,539,000
Treasury stock, shares	38,845,000	37,941,000		34,892,000
Treasury stock, at cost	$ 1,121,053,000	$ 1,110,438,000		$ 1,080,925,000
Maximum
Class of Stock [Line Items]
Number of shares authorized to be repurchase			$ 50,000,000
Stock Repurchase Program
Class of Stock [Line Items]
Treasury stock, shares	38,844,859
Treasury stock, at cost	$ 1,084,591,000