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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award        
Stock-based compensation expense $ 3,621 $ 3,856 $ 11,399 $ 9,698
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)        
Stock-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     267,782  
Vested     (257,189)  
Canceled     (46,222)  
Nonvested at October 31, 2015 512,060   512,060