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Shareholders' Equity (Tables)
3 Months Ended
Apr. 30, 2013
Equity [Abstract]  
Company's Common Share Repurchase And Issuance Activity
The Company’s common share issuance activity for the three months ended April 30, 2013 is summarized as follows:
 
 
Shares 
 
Weighted-
average
price per
share 
Treasury stock balance at January 31, 2013
21,436,566

 
$
42.26

Shares of treasury stock reissued
(210,896
)
 
 
Treasury stock balance at April 30, 2013
21,225,670

 
$
42.26