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EQUITY AWARD PLANS - Additional Information (Details)
 1 Months Ended 9 Months Ended
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
Apr. 30, 2020
USD ($)
plan
$ / shares
shares
Apr. 30, 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)           1,000,000.0    
Weighted average exercise price (in dollars per share) | $ / shares           $ 5.62    
Options outstanding (in shares)           7,700,000    
Outstanding options, weighted average exercise price (in dollars per share) | $ / shares           $ 5.14    
Contractual term           3 years 10 months 24 days    
Options outstanding, intrinsic value | $           $ 118,300,000    
Compensation not yet recognized | $           $ 793,200,000    
Period for recognition (in years)           2 years 7 months 6 days    
Proceeds from stock plans | $           $ 56,515,000 $ 67,277,000  
RSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares)           12,598,000    
Granted (in dollars per share) | $ / shares           $ 27.66    
Released (in dollars per share) | $ / shares           $ 33.94    
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)           3,300,000    
Proceeds from stock plans | $           $ 50,600,000    
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)           9,200,000    
2016 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares reserved for future issuance (in shares)           45,300,000    
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)           12,800,000    
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