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Shareholders' Equity (Tables)
 9 Months Ended
Oct. 31, 2017
Equity [Abstract]  
Share Repurchase Activity

Share repurchase activity under the Company’s share repurchase programs was as follows:

 

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

 

October 31,

 

 

October 31,

 

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

Number of common shares repurchased and subsequently

   retired

 

 

3,083,201

 

 

 

1,000,000

 

 

 

8,092,906

 

 

 

1,324,700

 

Total cost

 

$

66,533

 

 

$

35,083

 

 

$

157,044

 

 

$

45,787

 

Average cost per share, including commissions

 

$

21.58

 

 

$

35.08

 

 

$

19.41

 

 

$

34.56