Shareholders' Equity (Tables)

12 Months Ended

Jan. 31, 2012

Shareholders' Equity [Abstract]

Company's Common Share Repurchase And Issuance Activity

	Shares			Weighted- average price per share
Treasury stock balance at January 31, 2010		7,776,419		$	35.90
Shares of common stock repurchased under share repurchase programs		5,084,770			39.33
Shares of treasury stock reissued		(343,651	)
Treasury stock balance at January 31, 2011		12,517,538			37.28
Shares of common stock repurchased under share repurchase programs		6,736,436			46.74
Shares of treasury stock reissued		(1,087,213	)
Treasury stock balance at January 31, 2012		18,166,761			40.71