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Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Mar. 31, 2021
Variable Interest Entity [Line Items]    
Assets $ 3,831,487 $ 1,320,772
Liabilities 2,099,734 661,079
Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Assets 1,298,126 65,325
Liabilities $ 1,042,906 $ 26,929