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Summary of Significant Accounting Policies (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
May 31, 2024
USD ($)
Feb. 28, 2021
USD ($)
Sep. 30, 2019
period
Aug. 31, 2019
Jun. 30, 2026
USD ($)
vote
$ / shares
shares
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
Jun. 30, 2022
Feb. 28, 2026
USD ($)
Jul. 01, 2025
shares
Oct. 31, 2023
shares
Debt Instrument [Line Items]                      
Intangible assets         $ 0.0            
Proceeds from issuance of convertible notes, net of issuance costs         $ 0.0 $ 0.0 $ 342.3        
Allowable product return period (in days)         30 days            
Advertising expenses         $ 224.2 $ 247.0 435.0        
Expected dividend yield               0.00%      
Preferred stock, par value (in dollars per share) | $ / shares         $ 0.000025            
Preferred stock, shares authorized (in shares) | shares         50,000,000 50,000,000          
Preferred stock, shares issued (in shares) | shares         0 0          
Preferred stock, shares outstanding (in shares) | shares         0 0          
Employer matching contribution         $ 14.0 $ 14.5 $ 18.5        
Class A Common Stock                      
Debt Instrument [Line Items]                      
Common stock, number of votes | vote         1            
Class B Common Stock                      
Debt Instrument [Line Items]                      
Common stock, number of votes | vote         20            
2019 Equity Incentive Plan                      
Debt Instrument [Line Items]                      
Expiration period (in years)       10 years              
2019 Equity Incentive Plan | Class A Common Stock                      
Debt Instrument [Line Items]                      
Increase in number of shares authorized, as a percentage of total common stock outstanding     5.00%                
Increase in number of shares available for future issuance (in shares) | shares                   20,320,827 36,000,000
Number of shares available for future issuance (in shares) | shares         66,030,564            
Shares estimated to be purchased under ESPP | 2019 Employee Stock Purchase Plan                      
Debt Instrument [Line Items]                      
Share based compensation arrangement by share based payment award offering period       24 months              
Purchase of common stock, employee discount percentage       15.00%              
Number of purchase periods | period     4                
Purchase period (in months)     6 months                
Commencement of offering period (in years)     2 years                
Commencement of purchase period (in months)     6 months                
Shares estimated to be purchased under ESPP | 2019 Employee Stock Purchase Plan | Class A Common Stock                      
Debt Instrument [Line Items]                      
Increase in number of shares authorized, as a percentage of total common stock outstanding     1.00%                
Increase in number of shares available for future issuance (in shares) | shares                   4,064,165  
Number of shares available for future issuance (in shares) | shares         21,151,488            
Purchase price of common stock, percentage of fair market value     85.00%                
0.00% Convertible Senior Notes due 2026 | Convertible senior notes                      
Debt Instrument [Line Items]                      
Principal   $ 1,000.0     $ 199.0 $ 199.0          
Convertible debt, stated interest rate   0.00%     0.00% 0.00%          
Proceeds from issuance of convertible notes, net of issuance costs $ 801.0 $ 977.2                  
Debt instrument aggregate cash (724.9)                    
Principal payments         $ (199.0) $ 0.0     $ (199.0)    
5.50% Convertible Senior Notes due 2029 | Convertible senior notes                      
Debt Instrument [Line Items]                      
Principal $ 350.0       $ 350.0 $ 350.0          
Convertible debt, stated interest rate 5.50%       5.50% 5.50%          
Proceeds from issuance of convertible notes, net of issuance costs $ 342.3                    
Maximum | 2019 Equity Incentive Plan                      
Debt Instrument [Line Items]                      
Vesting period (in years)       4 years              
Earn rate, percent of shares granted         200.00% 200.00%          
Minimum | 2019 Equity Incentive Plan                      
Debt Instrument [Line Items]                      
Vesting period (in years)       2 years              
Earn rate, percent of shares granted         0.00% 0.00%          
Internal-Use Software | Maximum                      
Debt Instrument [Line Items]                      
Useful life         3 years