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Fair Value Measurements - Schedule of Fair Value of Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Partnership and LLC interests | $ 158,222 | $ 131,858
Equity Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Partnership and LLC interests | 24,553 | 17,028
Partnership And LLC Interests |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Partnership and LLC interests | 133,669 | 114,830
Level III |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Partnership and LLC interests | 16,500 | 13,700
Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration obligation | 56,312 | 53,449
Total liabilities | 56,312 | 53,449
Total assets | 16,466 | 13,694
Fair Value, Recurring | Equity Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Partnership and LLC interests | 10,697 | 12,421
Fair Value, Recurring | Partnership And LLC Interests |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Partnership and LLC interests | 5,769 | 1,273
Fair Value, Recurring | Level I |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration obligation | 0 | 0
Total liabilities | 0 | 0
Total assets | 0 | 0
Fair Value, Recurring | Level I | Equity Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Partnership and LLC interests | 0 | 0
Fair Value, Recurring | Level I | Partnership And LLC Interests |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Partnership and LLC interests | 0 | 0
Fair Value, Recurring | Level II |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration obligation | 0 | 0
Total liabilities | 0 | 0
Total assets | 0 | 0
Fair Value, Recurring | Level II | Equity Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Partnership and LLC interests | 0 | 0
Fair Value, Recurring | Level II | Partnership And LLC Interests |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Partnership and LLC interests | 0 | 0
Fair Value, Recurring | Level III |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration obligation | 56,312 | 53,449
Total liabilities | 56,312 | 53,449
Total assets | 16,466 | 13,694
Fair Value, Recurring | Level III | Equity Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Partnership and LLC interests | 10,697 | 12,421
Fair Value, Recurring | Level III | Partnership And LLC Interests |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Partnership and LLC interests | $ 5,769 | $ 1,273

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