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Equity Incentive Plans - Outstanding Common Stock Options and Related Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Shares Subject to Outstanding Options        
Beginning balance of options outstanding (shares) 2,465,242 2,542,025 2,312,633  
Granted (shares) 0 161,715 399,239  
Exercised (shares) (367,991) (111,688) (113,546)  
Forfeited (shares) (101,782) (102,828) (45,702)  
Expired (shares) (139,130) (23,982) (10,599)  
Ending balance of options outstanding (shares) 1,856,339 2,465,242 2,542,025 2,312,633
Options vested and exercisable, outstanding (shares) 1,709,661      
Weighted- Average Exercise Price per Share        
Options outstanding, weighted average exercise price (in usd per share) $ 21.90 $ 21.72 $ 20.20  
Options granted, weighted average exercise price (in usd per share)   28.20 27.60  
Options exercised, weighted average exercise price (in usd per share) 6.09 12.00 6.58  
Options forfeited, weighted average exercise price (in usd per share) 30.69 35.79 33.64  
Options expired, weighted average exercise price (in usd per share) 34.06 31.63 22.21  
Options outstanding, weighted average exercise price (in usd per share) 23.64 $ 21.90 $ 21.72 $ 20.20
Options vested and exercisable, weighted average exercise price (in usd per share) $ 23.20      
Additional disclosures        
Options outstanding, weighted average remaining contractual term 5 years 7 months 6 years 4 months 24 days 7 years 4 months 8 years
Options vested and exercisable, weighted average remaining contractual term 5 years 5 months      
Options outstanding, aggregate intrinsic value $ 8,443 $ 12,185 $ 19,377 $ 59,509
Options vested and exercisable, aggregate intrinsic value $ 8,443