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Debt - Convertible Senior Notes Due 2029 (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 12, 2022
USD ($)
day
$ / shares
May 14, 2018
USD ($)
day
$ / shares
Jul. 05, 2017
USD ($)
day
$ / shares
Dec. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Debt Instrument [Line Items]                
Loss on extinguishment of debt | $       $ 3,500,000     $ 3,545,000 $ 0
2029 Convertible Notes | Class A Common Stock                
Debt Instrument [Line Items]                
Conversion rate per $1,000 principal amount 0.0890313              
2029 Convertible Notes | Senior Notes                
Debt Instrument [Line Items]                
Stated interest rate 3.75%              
Principle amount | $ $ 230,000,000              
Effective interest rate         4.28%   4.28%  
Conversion price, per share (in dollars per share) | $ / shares $ 11.23              
2029 Convertible Notes | Senior Notes | Debt Conversion, Condition One                
Debt Instrument [Line Items]                
Threshold trading days (whether or not consecutive) 20              
Threshold consecutive trading days 30              
Threshold percentage of stock price trigger 130.00%              
2029 Convertible Notes | Senior Notes | Debt Conversion, Condition One | Debt Instrument, Redemption, Period One                
Debt Instrument [Line Items]                
Threshold trading days (whether or not consecutive) 20              
Threshold consecutive trading days 30              
Threshold percentage of stock price trigger 130.00%              
Repurchase price, percent of principal amount 100.00%              
2029 Convertible Notes | Senior Notes | Debt Conversion, Condition Two                
Debt Instrument [Line Items]                
Threshold consecutive trading days 5              
Threshold percentage of stock price trigger 98.00%              
Threshold business days 5              
2024 Convertible Notes | Class A Common Stock                
Debt Instrument [Line Items]                
Conversion rate per $1,000 principal amount     0.1          
2024 Convertible Notes | Senior Notes                
Debt Instrument [Line Items]                
Stated interest rate     2.875%          
Principle amount | $     $ 143,750,000          
Effective interest rate         3.35%   3.35%  
Conversion price, per share (in dollars per share) | $ / shares     $ 10.00          
Loss on extinguishment of debt | $         $ 0 $ 0 $ 8,935,000 0
2024 Convertible Notes | Senior Notes | Debt Conversion, Condition One                
Debt Instrument [Line Items]                
Threshold trading days (whether or not consecutive)     20          
Threshold consecutive trading days     30          
Threshold percentage of stock price trigger     130.00%          
2024 Convertible Notes | Senior Notes | Debt Conversion, Condition One | Debt Instrument, Redemption, Period One                
Debt Instrument [Line Items]                
Threshold trading days (whether or not consecutive)     20          
Threshold consecutive trading days     30          
Threshold percentage of stock price trigger     130.00%          
Repurchase price, percent of principal amount     100.00%          
2024 Convertible Notes | Notes Repurchases                
Debt Instrument [Line Items]                
Repurchased principal amount | $         $ 109,400,000   $ 109,400,000  
Repurchase price | $       117,500,000        
2025 Convertible Notes | Senior Notes                
Debt Instrument [Line Items]                
Stated interest rate   2.375%            
Principle amount | $   $ 172,500,000            
Effective interest rate         2.88%   2.88%  
Conversion rate per $1,000 principal amount   0.0628931            
Conversion price, per share (in dollars per share) | $ / shares   $ 15.90            
Loss on extinguishment of debt | $         $ 0 $ 0 $ (5,389,000) $ 0
2025 Convertible Notes | Senior Notes | Debt Instrument, Redemption, Period One                
Debt Instrument [Line Items]                
Threshold consecutive trading days   30            
Threshold percentage of stock price trigger   130.00%            
Repurchase price, percent of principal amount   100.00%            
2025 Convertible Notes | Senior Notes | Debt Conversion, Condition One                
Debt Instrument [Line Items]                
Threshold trading days (whether or not consecutive)   20            
Threshold consecutive trading days   30            
Threshold percentage of stock price trigger   130.00%            
2025 Convertible Notes | Senior Notes | Debt Conversion, Condition Two                
Debt Instrument [Line Items]                
Threshold consecutive trading days   5            
Threshold percentage of stock price trigger   98.00%            
Threshold business days   5            
2025 Convertible Notes | Notes Repurchases                
Debt Instrument [Line Items]                
Repurchased principal amount | $         $ 69,100,000   $ 69,100,000  
Repurchase price | $       $ 62,900,000