Shareholders' Equity (Tables)

9 Months Ended

Oct. 31, 2011

Shareholders' Equity [Abstract]

Company's Common Share Repurchase And Issuance Activity

	Shares			Weighted- average price per share
Treasury stock held at January 31, 2011		12,517,538		$	37.28
Shares of common stock repurchased under share repurchase program		6,442,542			46.57
Shares of treasury stock reissued		(992,007	)		38.34
Treasury stock held at October 31, 2011		17,968,073			40.55