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Share Based Compensation (Tables)
 3 Months Ended
Apr. 30, 2015
Share-based Compensation [Abstract]  
Weighted average assumptions by grant year
The weighted average assumptions used for the Black-Scholes option pricing model by grant year are as follows:
 
 
Three Months Ended
 
 
April 30, 2015
 
April 30, 2014
Risk-free interest rate
 
1.34
%
 
1.32
%
Expected dividend yield
 
2.59
%
 
1.53
%
Expected volatility factor
 
36.81
%
 
38.65
%
Expected option term (in years)
 
3.75

 
4.00

 
 
 
 
 
Weighted average grant date fair value
 
$4.78
 
$9.18