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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award        
Stock-based compensation expense $ 8,325 $ 3,550 $ 21,217 $ 11,020
Number of Shares Authorized 4,000,000   4,000,000  
Number of Shares Available for Grant 1,700,000   1,700,000  
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Award Vesting Period     3 years  
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award        
Award Vesting Period     1 year  
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, 2017     487,596  
Granted     451,463  
Vested     (190,364)  
Canceled     (32,427)  
Nonvested at October 31, 2017 716,268   716,268  
Performance Based Restricted Stock Units (PSRUs)        
Stock-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares        
Nonvested at January 31, 2017     17,486  
Granted     159,102  
Canceled     (3,495)  
Nonvested at October 31, 2017 173,093   173,093