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Shareholders' Equity (Tables)
 12 Months Ended
Jan. 31, 2016
Equity [Abstract]  
Company's Common Share Repurchase And Issuance Activity
The Company’s common share repurchase and issuance activity for fiscal 2016 and 2015 is summarized as follows:  
 
Shares 
 
Weighted- average
price per share 
Treasury stock balance at January 31, 2014
21,177,130

 
$
42.26

Shares of common stock repurchased under share repurchase program
896,718

 
59.10

Shares of treasury stock reissued
(207,779
)
 
 
Treasury stock balance at January 31, 2015
21,866,069

 
42.95

Shares of common stock repurchased under share repurchase program
2,497,029

 
58.87

Shares of treasury stock reissued
(199,696
)
 
 
Treasury stock balance at January 31, 2016
24,163,402

 
$
44.59