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Employee Incentive Plans (Tables)
 9 Months Ended
Oct. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-based Compensation Expense by Statement of Operations Location
Stock-based compensation expense was recorded in the following cost and expense categories in the Company’s condensed consolidated statements of operations (in thousands):  
 Three Months Ended
October 31,		Nine Months Ended
October 31,
 2020201920202019
(unaudited)
Cost of revenue    
Subscription$6,090 $3,604 $15,229 $9,137 
Professional services and other2,113 1,900 5,924 5,292 
Research and development17,546 10,894 44,434 26,322 
Sales and marketing14,368 10,937 38,693 26,959 
General and administrative13,535 8,400 35,494 21,984 
Total$53,652 $35,735 $139,774 $89,694 
Schedule of Shares of Common Stock Reserved for Future Issuance
Shares of common stock reserved for future issuance were as follows:
As of
October 31, 2020
(unaudited)
Stock options and unvested RSUs outstanding14,069,326 
Available for future stock option and RSU grants20,720,051 
Available for ESPP4,752,501 
 39,541,878 
Schedule of Stock Option Activity
A summary of the Company’s stock option activity and related information was as follows:  
Number of
Options 
Weighted-
Average
Exercise
Price 
Weighted-
Average
Remaining
Contractual
Term (Years)
Aggregate
Intrinsic 
Value
(in thousands)
Outstanding as of January 31, 202012,359,302 $11.82 6.2$1,436,487 
Granted402,891 145.08 
Exercised(3,383,144)9.92 
Canceled(136,841)19.62 
Outstanding as of October 31, 2020 (unaudited)9,242,208 $18.21 5.8$1,770,981 
As of October 31, 2020
Vested and exercisable (unaudited)7,429,026 $9.87 5.4$1,485,523 
Schedule of Nonvested Restricted Stock Units Activity
A summary of the Company’s RSU activities and related information was as follows:  
Number of
RSUs		Weighted-
Average
Grant Date Fair Value Per Share
Outstanding as of January 31, 20204,893,241 $77.99 
Granted1,960,358 164.64 
Vested(1,667,917)79.28 
Forfeited(358,564)84.64 
Outstanding as of October 31, 2020 (unaudited)4,827,118 $112.24 
Schedule of ESPP Black-Scholes Option Pricing Model Estimated Fair Value Assumptions
The Company estimated the fair value of ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions:
 Three Months Ended
October 31,		Nine Months Ended
October 31,
 2020201920202019
(unaudited)
Expected volatility—%—%
50% - 54%
43% - 59%
Expected term (in years)——
0.5 - 1.0
0.5 - 1.0
Risk-free interest rate—%—%
0.17% - 0.18%
1.95% - 2.05%
Expected dividend yield————