Stock Repurchase Activity (Details) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended
	Aug. 31, 2017	Nov. 19, 2015	Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016	Jan. 28, 2017
Equity, Class of Treasury Stock [Line Items]
Amount authorized under stock repurchase program		$ 300,000,000	$ 300,000,000		$ 300,000,000
Stock Repurchase Program Expiration Date		Feb. 02, 2019
Shares of common stock repurchased during the period (in shares)	205,000		282,609	620,455	1,030,743	857,837
Shares acquired from holders of restricted stock unit awards to satisfy tax withholding requirements (in shares)			509	0	24,199	25,882
Value of common stock repurchased during current period	$ 2,400,000		$ 6,900,000	$ 21,400,000	$ 29,300,000	$ 29,700,000
Value of tax withholding payments related to shares acquired from holders of restricted stock unit awards			$ 7,800.0	$ 0	$ 700,000	$ 900,000
Shares of common stock repurchased to date (in shares)			18,098,225		18,098,225		17,067,482
Value of common stock repurchased to date			$ 567,975,000		$ 567,975,000		$ 538,724,000
Value of shares of common stock remaining available for repurchase under the program			$ 229,300,000		$ 229,300,000