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EQUITY AWARD PLANS - Additional Information (Details)
 1 Months Ended 3 Months Ended
Aug. 01, 2020
shares
Dec. 13, 2019
USD ($)
purchase_period
shares
Aug. 01, 2019
shares
Feb. 29, 2020
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Oct. 31, 2018
$ / shares
shares
Oct. 31, 2020
USD ($)
plan
$ / shares
shares
Oct. 31, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of equity incentive plans | plan             3  
Granted (in shares)             3,454,000  
Granted (in dollars per share) | $ / shares             $ 24.02  
Released (in dollars per share) | $ / shares             $ 31.23  
Exercises in period (in shares)             300,000  
Weighted average exercise price (in dollars per share) | $ / shares             $ 5.48  
Options outstanding (in shares)             7,200,000  
Outstanding options, weighted average exercise price (in dollars per share) | $ / shares             $ 5.08  
Contractual term             3 years 4 months 24 days  
Options outstanding, intrinsic value | $             $ 139,600,000  
Compensation not yet recognized | $             $ 656,900,000  
Period for recognition (in years)             2 years 6 months  
Proceeds from stock plans | $             $ 19,600,000 $ 23,973,000
Employee Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percent of eligible compensation (up to)   15.00%            
Monetary cap | $   $ 25,000            
Share cap (in shares)   1,000            
Offering period duration (in months)   12 months            
Number of six-month purchase periods | purchase_period   2            
Purchase price of common stock, percent   85.00%            
ESPP stock issued during period (in shares)             1,500,000  
Proceeds from stock plans | $             $ 18,100,000  
Common Class A | Employee Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares reserved for future issuance (in shares)   11,500,000            
Number of additional shares authorized   9,200,000            
Employee Stock Purchase Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares reserved for future issuance (in shares)             7,700,000  
2016 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares reserved for future issuance (in shares)             49,900,000  
2016 Plan | Common Class A                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares reserved for future issuance (in shares)             22,400,000  
Annual increase (in shares)             18,000,000.0  
Annual increase, percent of outstanding shares             5.00%  
Number of additional shares authorized 10,100,000   9,400,000          
Number of shares available for grant (in shares)             20,200,000  
Market Stock Units | RSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares)       75,000 200,000 100,000    
Granted (in dollars per share) | $ / shares       $ 20.80 $ 20.80 $ 25.16    
Released (in dollars per share) | $ / shares       $ 65 $ 65 $ 80    
Award vesting period       3 years 10 months 24 days 4 years 6 months 4 years 6 months    
Percent of awards to vest if average stock price exceeds threshold         0.06 0.06    
Equity instruments outstanding (in shares)             375,000