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Business Combinations - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Sep. 20, 2021
Mar. 31, 2022
Mar. 31, 2022
Mar. 31, 2023
Apr. 18, 2020
Business Acquisition [Line Items]          
Goodwill   $ 580,542 $ 580,542 $ 580,542  
Restricted Stock Units (RSUs)          
Business Acquisition [Line Items]          
Unvested awards (in shares)   2,087,324 2,087,324 1,775,732 2,500,000
Greenspring          
Business Acquisition [Line Items]          
Ownership percentage acquired 100.00%        
Cash consideration, net of working capital adjustment $ 185,000        
Earn-out (up to) 75,000        
Acquisition-related costs     $ 13,800    
Goodwill 573,750        
Revenue since acquisition date   $ 230,000      
Earnings since acquisition date   $ 54,000      
Greenspring | Contractual rights          
Business Acquisition [Line Items]          
Finite-lived intangible assets $ 320,500        
Weighted-average amortization period 10 years        
Greenspring | Client relationships          
Business Acquisition [Line Items]          
Finite-lived intangible assets $ 96,650        
Greenspring | Class A Common Stock          
Business Acquisition [Line Items]          
Stock issued for acquisition (in shares) 12,686,756        
Greenspring | Class C common stock          
Business Acquisition [Line Items]          
Stock issued for acquisition (in shares) 3,071,519