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EQUITY AWARD PLANS - Additional Information (Details)
 1 Months Ended 6 Months Ended
Dec. 13, 2019
USD ($)
purchase_period
shares
Aug. 01, 2019
shares
Dec. 31, 2019
$ / shares
shares
Oct. 31, 2018
$ / shares
shares
Jan. 31, 2020
USD ($)
plan
$ / shares
shares
Jan. 31, 2019
USD ($)
Jul. 31, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of equity incentive plans | plan         3    
Exercises in period (in shares)         900,000    
Weighted average exercise price (in dollars per share) | $ / shares         $ 5.74    
Options outstanding (in shares)         7,900,000    
Outstanding options, weighted average exercise price (in dollars per share) | $ / shares         $ 5.14    
Contractual term         4 years 2 months 12 days    
Options outstanding, intrinsic value | $         $ 215,300,000    
Compensation not yet recognized | $         $ 843,400,000    
Period for recognition (in years)         2 years 8 months 12 days    
Proceeds from stock plans | $         $ 26,486,000 $ 33,364,000  
RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares)         10,511,000    
Granted (in dollars per share) | $ / shares         $ 29.47    
Released (in dollars per share) | $ / shares         $ 33.72    
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)         1,000,000.0    
Proceeds from stock plans | $         $ 21,300,000    
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)         11,500,000    
2016 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares reserved for future issuance (in shares)         47,800,000    
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   9,400,000          
Number of shares available for grant (in shares)         14,300,000    
Market Stock Units | RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares)     200,000 100,000      
Granted (in dollars per share) | $ / shares     $ 20.80 $ 25.16      
Released (in dollars per share) | $ / shares     $ 65 $ 80      
Award vesting period     4 years 6 months 4 years 6 months      
Percent of awards to vest if average stock price exceeds threshold     0.05555555556 0.05555555556      
Equity instruments outstanding (in shares)         300,000