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Share Based Compensation (Details)
$ in Thousands
12 Months Ended
Jan. 31, 2016
USD ($)
Director
Award
Plans
shares
Jan. 31, 2015
USD ($)
Jan. 31, 2014
USD ($)
May. 22, 2012
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of share based compensation plans | Plans 2      
Number of Directors on Personnel and Compensation Committee | Director 2      
Number of award types | Award 2      
Granted, number of options (in shares) 289,600      
Award vesting period 4 years      
Expiration period 5 years      
Intrinsic value of options exercised | $ $ 172 $ 1,467 $ 3,019  
Total compensation cost for non-vested awards not yet recognized in the Company's statements of income | $ $ 2,089      
Weighted average period to recognize costs associated with non-vested awards in years 2 years 2 months 22 days      
Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for grant under the plan 100,000      
Granted (in shares) 18,721      
stock unit to share conversion 1      
2010 Stock Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for grant under the plan       2,000,000
Remaining shares available for grant 1,293,876      
Maximum exercise period 10 years      
2010 Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average period to recognize costs associated with non-vested awards in years 2 years 5 days      
Total unrecognized compensation cost net of estimated forfeitures | $ $ 576      
2010 Stock Incentive Plan [Member] | Time-vested RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 3 years      
Granted (in shares) 39,025      
2010 Stock Incentive Plan [Member] | Performance-based RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 3 years      
Granted (in shares) 68,570      
Percentage of target award 100.00%      
2010 Stock Incentive Plan [Member] | Performance-based RSUs [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance shares target award 0.00%      
2010 Stock Incentive Plan [Member] | Performance-based RSUs [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance shares target award 150.00%