Earnings Per Share And Shareholders' Equity (Schedule of Company's Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	1 Months Ended	6 Months Ended
	Aug. 31, 2017	Jul. 29, 2017	Jul. 30, 2016	Apr. 29, 2017	Jan. 28, 2017	Apr. 30, 2016
Shares Repurchased		2,656	4,968
Amount Repurchased		$ 132.0	$ 388.0
February 2017 Repurchase Program [Member] [Member]
Amount Authorized				$ 250.0
Shares Repurchased		2,605
Amount Repurchased		$ 129.0
Average Stock Price of Shares Repurchased within Program		$ 49.58
Remaining authorized repurchase amount		$ 121.0
February 2016 Repurchase Program [Member]
Amount Authorized						$ 500.0
Shares Repurchased		51	4,968
Amount Repurchased		$ 3.0	$ 388.0
Average Stock Price of Shares Repurchased within Program		$ 58.95	$ 78.07
Remaining authorized repurchase amount				$ 59.0
June 2015 Repurchase Program [Member]
Remaining authorized repurchase amount						$ 17.0
Accounts Payable [Member] | February 2017 Repurchase Program [Member] [Member]
Share repurchase reflected in Accounts payable		$ 3.0
Accounts Payable [Member] | February 2016 Repurchase Program [Member]
Share repurchase reflected in Accounts payable			$ 3.0		$ 3.0
Subsequent Event [Member] | February 2017 Repurchase Program [Member] [Member]
Shares Repurchased	2,400
Amount Repurchased	$ 90.0