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Fair Value Measurements, Changes in Fair Value of the Level 3 Assets (Details) - Level 3 [Member] - USD ($)
$ in Thousands
9 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 178,579 $ 193,963
Changes in fair value of investment in Datavant, included in net loss $ (42,645) $ (21,452)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Fair Value of Debt and Liability Instruments Gain (Loss) on Fair Value of Debt and Liability Instruments
Ending Balance $ 135,934 $ 172,511