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Stock-Based Compensation - Summary of Stock Option Activity Under Equity Incentive Plans and Related Information (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
$ / shares
shares
Jan. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Shares Subject to Options Outstanding, Beginning balance | shares 12,318,800  
Shares Subject to Options Outstanding, Options granted | shares 1,133,056  
Shares Subject to Options Outstanding, Options exercised | shares (930,595)  
Shares Subject to Options Outstanding, Options forfeited/cancelled | shares (784,749)  
Shares Subject to Options Outstanding, Ending balance | shares 11,736,512 12,318,800
Shares Subject to Options Outstanding, Vested and expected to vest | shares 11,628,379  
Shares Subject to Options Outstanding, Exercisable | shares 9,164,951  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Weighted Average Exercise Price, Beginning Balance | $ / shares $ 7.44  
Weighted Average Exercise Price, Options granted | $ / shares 16.91  
Weighted Average Exercise Price, Options exercised | $ / shares 5.82  
Weighted Average Exercise Price, Options forfeited/cancelled | $ / shares 15.26  
Weighted Average Exercise Price, Ending Balance | $ / shares 7.96 $ 7.44
Weighted Average Exercise Price, Vested and expected to vest | $ / shares 7.90  
Weighted Average Exercise Price, Exercisable | $ / shares $ 6.11  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Weighted Average Remaining Contractual Life (Years) 6 years 1 month 13 days 6 years 5 months 1 day
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest 6 years 1 month 6 days  
Weighted Average Remaining Contractual Life (Years), Exercisable 5 years 5 months 27 days  
Aggregate Intrinsic Value, Balance | $ $ 127,825 $ 119,606
Aggregate Intrinsic Value, Vested and expected to vest | $ 127,359  
Aggregate Intrinsic Value, Exercisable | $ $ 116,739