Stock Repurchase Activity (Details) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended
	Sep. 07, 2018	Nov. 19, 2015	Aug. 04, 2018	Jul. 29, 2017	Aug. 04, 2018	Jul. 29, 2017	Feb. 03, 2018
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)	122,500		336,302	282,609	376,601	1,030,743
Shares acquired from holders of restricted stock unit awards to satisfy tax withholding requirements (in shares)			0	509	18,765	24,199
Value of common stock repurchased during current period	$ 2,400,000		$ 8,000,000	$ 6,900,000	$ 8,800,000	$ 29,300,000
Value of tax withholding payments related to shares acquired from holders of restricted stock unit awards			$ 0	$ 7,800.0	$ 400,000	$ 700,000
Shares of common stock repurchased to date (in shares)			20,286,892		20,286,892		19,910,291
Value of common stock repurchased to date			$ 602,078,000		$ 602,078,000		$ 593,230,000
Value of shares of common stock remaining available for repurchase under the program			$ 195,700,000		$ 195,700,000