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Share Based Compensation (Tables)
 6 Months Ended
Jul. 31, 2017
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:
 
 
Six Months Ended
 
 
July 31, 2017
 
July 31, 2016
Risk-free interest rate
 
1.68
%
 
1.05
%
Expected dividend yield
 
1.78
%
 
3.33
%
Expected volatility factor
 
33.87
%
 
32.61
%
Expected option term (in years)
 
4.25

 
4.00

 
 
 
 
 
Weighted average grant date fair value
 
$7.35
 
$3.05