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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2015
Jul. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award        
Stock-based compensation expense $ 3,960 $ 3,869 $ 7,778 $ 5,842
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 4,000,000.0   4,000,000.0  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 2,400,000.0   2,400,000.0  
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares        
Nonvested at January 31, 2015     547,689  
Granted     251,420  
Vested     (251,904)  
Canceled     (27,610)  
Nonvested at July 31, 2015 519,595   519,595