Subsequent Event (Details) - USD ($) shares in Thousands, $ in Millions	1 Months Ended	6 Months Ended
	Aug. 31, 2017	Jul. 29, 2017	Jul. 30, 2016
Subsequent Event [Line Items]
Shares Repurchased		2,656	4,968
Amount Repurchased		$ 132.0	$ 388.0
February 2017 Repurchase Program [Member] [Member]
Subsequent Event [Line Items]
Shares Repurchased		2,605
Amount Repurchased		$ 129.0
February 2017 Repurchase Program [Member] [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Shares Repurchased	2,400
Amount Repurchased	$ 90.0
February 2016 Repurchase Program [Member]
Subsequent Event [Line Items]
Shares Repurchased		51	4,968
Amount Repurchased		$ 3.0	$ 388.0