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Stock-Based Compensation RSU (Details)
9 Months Ended
Oct. 31, 2016
shares
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, 2016 496,329
Granted 236,311 [1]
Vested (184,277)
Canceled (17,969)
Nonvested at October 31, 2016 530,394
Performance-based Restricted Stock Units (RSUs)  
Stock-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares  
Granted 18,563
[1] Includes 18,563 shares of performance-based restricted stock units, which assumes maximum achievement.