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Share Based Compensation (Tables)
 9 Months Ended
Oct. 31, 2012
Share-based Compensation [Abstract]  
Weighted average assumptions by grant year
The fair value of options granted during the nine months ended October 31, 2012 was estimated using the following assumptions:
 
Grant Date
 
April 2, 2012
 
August 27, 2012
Risk-free interest rate
0.86
%
 
0.86
%
Expected dividend yield
1.33
%
 
1.41
%
Expected volatility factor
49.65
%
 
49.11
%
Expected option term (in years)
3.75

 
3.75