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De-SPAC Merger Transaction - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 29, 2023 USD ($) | Jun. 08, 2023 shares | Jun. 07, 2023 USD ($) $ / shares shares | Jun. 06, 2023 $ / shares shares | Jun. 05, 2023 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) $ / shares shares | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) shares | Mar. 31, 2021 USD ($) | Mar. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount received | $ |  |  |  |  |  |  |  |  |  |  |  | $ 192,800 |
Discount rate |  |  |  | 20 |  |  |  |  |  |  |  |  |
Valuation (in dollars per share) | $ / shares |  |  |  | $ 10 |  |  |  |  |  |  |  |  |
Discounted valuation (in dollars per share) | $ / shares |  |  |  | $ 8 |  |  |  |  |  |  |  |  |
Compensation expense | $ |  |  |  |  |  | $ 27,001 | $ 3,507 | $ 2,828 |  | $ 10,085 |  | 23,153 | $ 107,808
Cash and cash equivalents | $ |  |  |  |  |  | $ 3,057 |  | $ 70,588 |  | $ 8,726 | [1] |  |
Net proceeds | $ |  |  | $ 1,800 |  |  |  |  |  |  |  |  |  |
Units outstanding (in shares) |  |  |  |  |  |  |  | 67,486,000 |  | 67,486,000 |  |  |
Units issued (in shares) |  |  |  |  |  |  |  | 67,486,000 |  | 67,486,000 |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  | 0 |  |  |  | 0 |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  | 0 |  |  |  | 0 |  |  |
Fair value | $ |  |  |  |  |  | $ 1,128 |  |  |  | $ 0 | [1] |  |
Gain (loss) on investment | $ |  |  |  |  |  | (3,461) | $ (12,020) | $ (56,011) | $ (2,180) | $ (51,421) |  | $ 31,837 | $ (30,670)
Conversion of BCG Common Class A Units |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Additional value | $ |  |  |  |  |  | 15,000 |  |  |  |  |  |  |
Compensation expense | $ |  |  |  |  |  | $ 15,000 |  |  |  |  |  |  |
River North, L.P. |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds | $ | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |
Avalon |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ |  |  | 27,900 |  |  |  |  |  |  |  |  |  |
Transaction expense | $ |  |  | 26,100 |  |  |  |  |  |  |  |  |  |
Ben | Additional Paid-in Capital |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction expense | $ |  |  | $ 21,700 |  |  |  |  |  |  |  |  |  |
Beneficient Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Units converted (in shares) |  |  | 23,625,000 |  |  |  |  |  |  |  |  |  |
Warrants outstanding (in shares) |  | 23,757,500 |  |  |  | 23,757,500 |  |  |  |  |  |  |
Warrants issued (in shares) |  | 23,757,500 |  |  |  |  |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) | $ / shares |  |  | $ 11.5 |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  | 10 |  |  |  |  |  |  |  |  |  |
Fair value | $ |  |  |  |  |  | $ 1,100 |  |  |  |  |  |  |
Gain (loss) on investment | $ |  |  |  |  |  | $ 1,500 |  |  |  |  |  |  |
Beneficient Warrants | $18.00 Minimum Share Price |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase price (in dollars per share) | $ / shares |  |  | 0.01 |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  | 18 |  |  |  |  |  |  |  |  |  |
Beneficient Warrants | $10.00 Minimum Share Price |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase price (in dollars per share) | $ / shares |  |  | $ 0.1 |  |  |  |  |  |  |  |  |  |
Avalon Warrants, Publicly Traded |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants assumed (in shares) |  |  | 15,525,000 |  |  |  |  |  |  |  |  |  |
Avalon Warrants, Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants assumed (in shares) |  |  | 8,100,000 |  |  |  |  |  |  |  |  |  |
Avalon Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Price per unit (in dollars per share) | $ / shares |  |  |  |  | $ 10.588 |  |  |  |  |  |  |  |
Aggregate amount received | $ |  |  | $ 20,000 |  | $ 25,000 |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |
Reserve amount | $ |  |  |  |  | 20,000 |  |  |  |  |  |  |  |
Transaction expense | $ |  |  | $ 26,100 |  |  |  |  |  |  |  |  |  |
Avalon Class A Common Stock | Ben |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount received | $ |  |  |  |  | 5,000 |  |  |  |  |  |  |  |
Disbursed amount | $ |  |  |  |  | $ 5,000 |  |  |  |  |  |  |  |
Common Class A |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 | $ 0.001 |  |  |  | $ 0.001 |  |  |
Shares held post conversion (in shares) |  |  |  |  | 2,956,480 |  |  |  |  |  |  |  |
Minimum price per share (in dollars per share) | $ / shares |  |  |  |  | $ 5 |  |  |  |  |  |  |  |
Maximum percentage of stock to sell |  |  |  |  | 10.00% |  |  |  |  |  |  |  |
Units converted (in shares) |  |  |  | 1.25 |  |  |  |  |  |  |  |  |
Stock issued (in shares) |  |  | 7,971,864 |  |  |  |  |  |  |  |  |  |
Units converted (in shares) |  |  |  | 1,396,457 |  |  |  |  |  |  |  |  |
Units outstanding (in shares) |  | 188,674,282 |  |  |  | 189,503,000 |  |  |  | 179,634,000 |  |  |
Units issued (in shares) |  | 188,674,282 |  |  |  | 190,047,000 |  |  |  | 180,178,000 |  |  |
Additional shares (in shares) |  | 699,216 |  |  |  |  |  |  |  |  |  |  |
Stock outstanding following combination (in shares) |  | 189,379,498 |  |  |  |  |  |  |  |  |  |  |
Common Class A | Conversion of BCG Common Class A Units |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection to conversion (in shares) |  |  |  | 86,116,884 |  |  |  |  |  |  |  |  |
Common Class A | Conversion of BCG Preferred B-2 Units |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection to conversion (in shares) |  |  |  | 94,050,534 |  |  |  |  |  |  |  |  |
Common Class A | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Volume weighted average share price (in dollars per share) | $ / shares |  |  |  |  | $ 5 |  |  |  |  |  |  |  |
Common Class A | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Volume weighted average share price (in dollars per share) | $ / shares |  |  |  |  | 8 |  |  |  |  |  |  |  |
Series A Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 |  |  |  |  |  |  |  |
Forward Purchase Agreement, Purchased Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase agreement, transaction shares (in shares) |  |  |  |  | 1,064,333 |  |  |  |  |  |  |  |
Forward Purchase Agreement, Prepaid Forward Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase agreement, transaction shares (in shares) |  |  |  |  | 1,892,147 |  |  |  |  |  |  |  |
Class A common stock, par value $0.001 per share |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Price per unit (in dollars per share) | $ / shares |  |  |  |  | $ 10.588 |  |  |  |  |  |  |  |
Avalon Class B Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  | 2,796,864 |  |  |  | 0 |  |  |  | 0 |  |  |
Preferred stock, shares issued (in shares) |  | 2,796,864 | 2,796,864 |  |  | 0 |  |  |  | 0 |  |  |
Common Class B |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.001 |  |  |  | $ 0.001 |  |  |
Units converted (in shares) |  |  |  | 1.25 |  |  |  |  |  |  |  |  |
Units converted (in shares) |  |  |  | 15,312,360 |  |  |  |  |  |  |  |  |
Units outstanding (in shares) |  | 19,140,451 |  |  |  | 19,140,000 |  |  |  | 19,140,000 |  |  |
Units issued (in shares) |  | 19,140,451 |  |  |  | 19,140,000 |  |  |  | 19,140,000 |  |  |
Common Class B | Conversion of BCG Common Class B Units |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection to conversion (in shares) |  |  |  | 19,140,451 |  |  |  |  |  |  |  |  |
[1] | Retroactively adjusted March 31, 2023 for the de-SPAC merger transaction as described in Note 4. Such adjustments are unaudited.

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