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Stock Based Compensation (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2014
Jul. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 3,869 $ 2,227 $ 5,842 $ 5,318
Number of shares authorized for grant 4,000,000   4,000,000  
Number of shares available for grant 2,600,000   2,600,000  
Contractual term (in years)     10 years  
Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards vesting period, (in years) 1 year      
Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards vesting period, (in years) 4 years