Shareholders' Equity (Company's Common Share Repurchase And Issuance Activity) (Details) (USD $)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
Increase (Decrease) in Treasury Stock [Roll Forward]
Treasury stock, beginning balance, Shares	21,436,566	18,166,761
Shares of common stock repurchased under share repurchase programs, Shares		3,878,548
Shares of treasury stock reissued	(259,436)	(608,743)
Treasury stock, ending balance, Shares	21,177,130	21,436,566
Treasury stock, beginning balance, Weighted-average price per share	$ 42.26	$ 40.71
Shares of common stock repurchased under share repurchase programs, Weighted-average price per share		$ 49.33
Treasury stock, ending balance, Weighted-average price per share	$ 42.26	$ 42.26