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De-SPAC Merger Transaction - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
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Jun. 08, 2023 shares | Jun. 07, 2023 USD ($) $ / shares shares | Jun. 06, 2023 USD ($) subclass $ / shares shares | Jun. 05, 2023 USD ($) category $ / shares shares | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) shares | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) shares | Mar. 31, 2024 USD ($) | Mar. 31, 2025 USD ($) $ / shares shares | Aug. 06, 2024 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of categories of shares | category |  |  |  | 2 |  |  |  |  |  |  |
New subclass of common units | subclass |  |  | 1 |  |  |  |  |  |  |  |
Discount rate |  |  | 0.20 |  |  |  |  |  |  |  |
Valuation (in dollars per share) | $ / shares |  |  | $ 800.00 |  |  |  |  |  |  |  |
Discounted valuation (in dollars per share) | $ / shares |  |  | $ 640.00 |  |  |  |  |  |  |  |
Compensation expense | $ |  |  |  |  | $ 462 | $ 3,364 | $ 923 | $ 4,358 |  |  |
Cash and cash equivalents | $ |  |  |  |  | 4,902 |  | 4,902 |  |  | $ 1,346 |
Net proceeds | $ |  | $ 1,800 |  |  |  |  |  |  |  |  |
Securities exercisable (in shares) |  |  |  |  |  |  |  |  |  |  | 1,325,382
Fair value | $ |  |  |  |  | 365 |  | 365 |  |  | $ 227 |
Gain (loss) on financial instruments, net | $ |  |  |  |  | $ 211 | (179) | $ 166 | (1,362) |  |  |
Conversion of BCG Common Class A Units |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additional value | $ |  |  | $ 15,000 |  |  |  |  |  |  |  |
Compensation expense | $ |  |  |  |  |  |  |  |  | $ 15,000 |  |
Avalon |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ |  | 27,900 |  |  |  |  |  |  |  |  |
Transaction expense | $ |  | 26,100 |  |  |  |  |  |  |  |  |
Beneficient | APIC |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | 24,699,725 |  | 24,699,725 |  |  | 24,699,725 |
Warrants issued (in shares) | 23,757,500 |  |  |  |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) | $ / shares |  | $ 920.00 |  |  |  |  |  |  |  |  |
Earnout period |  | 5 years |  |  |  |  |  |  |  |  |
Minimum number of days for written notice |  | 30 days |  |  |  |  |  |  |  |  |
Number of trading days |  | 20 days |  |  |  |  |  |  |  |  |
Number of consecutive trading days |  | 30 days |  |  |  |  |  |  |  |  |
Threshold business days |  | 3 days |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  | $ 800.00 |  |  |  |  |  |  |  |  |
Fair value | $ |  |  |  |  | $ 400 |  | $ 400 |  |  | $ 200 |
Gain (loss) on financial instruments, net | $ |  |  |  |  | $ (200) | $ 0 | $ (200) | $ 0 |  |  |
Beneficient Warrants | $18.00 Minimum Share Price |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repurchase price (in dollars per share) | $ / shares |  | 0.80 |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  | 1,440 |  |  |  |  |  |  |  |  |
Beneficient Warrants | $10.00 Minimum Share Price |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repurchase price (in dollars per share) | $ / shares |  | $ 8.00 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Closing period |  | 30 days |  |  |  |  |  |  |  |  |
Avalon Class A Common Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Price per unit (in dollars per share) | $ / shares |  |  |  | $ 847.04 |  |  |  |  |  |  |
Aggregate amount received | $ |  |  |  | $ 25,000 |  |  |  |  |  |  |
Reserve amount | $ |  |  |  | 20,000 |  |  |  |  |  |  |
Units converted (in shares) |  | 1 |  |  |  |  |  |  |  |  |
Transaction expense | $ |  | $ 26,100 |  |  |  |  |  |  |  |  |
Avalon Class A Common Stock | Beneficient |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disbursed amount | $ |  |  |  | $ 5,000 |  |  |  |  |  |  |
Avalon Class A Common Stock | River North, L.P. |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate amount received | $ |  | $ 20,000 |  |  |  |  |  |  |  |  |
Series A Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.001 |  |  |  |  |  |  |
Class A common stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.001 | $ 0.001 |  | $ 0.001 |  |  | $ 0.001 |
Shares held post conversion (in shares) |  |  |  | 36,956 |  |  |  |  |  |  |
Units converted (in shares) |  |  | 1.25 |  |  |  |  |  |  |  |
Valuation (in dollars per share) | $ / shares |  |  |  |  | $ 10.00 |  | $ 10.00 |  |  |  |
Issuance of stock (in shares) |  | 99,649 |  |  |  |  |  |  |  |  |
Units outstanding (in shares) | 2,358,429 |  |  |  | 9,456,000 |  | 9,456,000 |  |  | 8,474,000 |
Units issued (in shares) | 2,358,429 |  |  |  | 9,465,000 |  | 9,465,000 |  |  | 8,483,000 |
Conversion of shares upon issuance (in shares) |  | 0.25 |  |  |  |  |  |  |  |  |
Additional shares (in shares) | 8,595 |  |  |  |  |  |  |  |  |  |
Stock outstanding following combination (in shares) | 2,367,244 |  |  |  |  |  |  |  |  |  |
Securities exercisable (in shares) |  | 1 |  |  |  |  |  |  |  |  |
Class A common stock | Conversion of BCG Common Class A Units |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection to conversion (in shares) |  |  | 1,076,462 |  |  |  |  |  |  |  |
Class A common stock | Conversion of BCG Preferred B-2 Units |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection to conversion (in shares) |  |  | 1,175,632 |  |  |  |  |  |  |  |
Class A common stock | Avalon Warrants, Publicly Traded |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Warrant exercisable adjusted for the stock splits (in shares) |  | 194,063 |  |  |  |  |  |  |  |  |
Class A common stock | Avalon Warrants, Private Placement |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Warrant exercisable adjusted for the stock splits (in shares) |  | 101,250 |  |  |  |  |  |  |  |  |
Forward Purchase Agreement, Purchased Shares |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase agreement, transaction shares (in shares) |  |  |  | 13,305 |  |  |  |  |  |  |
Forward Purchase Agreement, Prepaid Forward Shares |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase agreement, transaction shares (in shares) |  |  |  | 23,651 |  | 23,651 |  | 23,651 |  |  |
Series A preferred stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Units converted (in shares) |  | 1 |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) | 34,962 | 34,961 |  |  | 0 |  | 0 |  |  | 0 |
Preferred stock, shares outstanding (in shares) | 34,962 |  |  |  | 0 |  | 0 |  |  | 0 |
Securities exercisable (in shares) |  | 1 |  |  |  |  |  |  |  |  |
Avalon Class B Common Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Class B |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.001 | $ 0.001 |  | $ 0.001 |  |  | $ 0.001 |
Units converted (in shares) |  |  | 1.25 |  |  |  |  |  |  |  |
Units outstanding (in shares) | 239,256 |  |  |  | 239,000 |  | 239,000 |  |  | 239,000 |
Units issued (in shares) | 239,256 |  |  |  | 239,000 |  | 239,000 |  |  | 239,000 |
Class B | Conversion of BCG Common Class B Units |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection to conversion (in shares) |  |  | 239,256 |  |  |  |  |  |  |  |

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