Stock Repurchase Program and Dividends - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Jul. 31, 2016	Aug. 02, 2015	Jul. 31, 2016	Aug. 02, 2015	Jan. 31, 2016
Stock Repurchase Program and Dividend [Line Items]
Common stock repurchased, shares		665,517	899,301	1,393,146	1,563,703
Common stock repurchased, average cost per share		$ 53.38	$ 80.55	$ 54.67	$ 79.94
Common stock repurchased, total cost		$ 35,527,000	$ 72,438,000	$ 76,166,000	$ 125,000,000
Treasure stock, value		$ 1,535,000	$ 1,936,000	$ 1,535,000	$ 1,936,000	$ 1,906,000
Stock repurchase program, authorized shares	$ 500,000,000
Stock repurchase program, execution period	3 years
Cash dividend, per common share		$ 0.37	$ 0.35	$ 0.74	$ 0.70