Shareholders' Equity - Share Repurchase Programs (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Oct. 28, 2017	Jan. 28, 2017	Oct. 28, 2017	Oct. 29, 2016	Feb. 28, 2017
Class of Stock [Line Items]
Stock Repurchased During Period, Value		$ 15	$ 165,732	$ 254,289
2017 Repurchase Program [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount					$ 150,000
Stock Repurchased During Period, Shares	0.5		3.1
Stock Repurchased During Period, Value	$ 21,700		$ 150,000