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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (K-O) (Details) $ in Thousands |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Dec. 18, 2023 USD ($) shares | Aug. 21, 2023 USD ($) | Mar. 31, 2025 USD ($) investment | Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) investment | Mar. 10, 2025 USD ($) | Feb. 27, 2025 | Jan. 06, 2025 | Nov. 15, 2024 | May 03, 2024 company
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities, FV-NI, unrealized gain (loss) |  |  |  |  |  | $ (16,209) | $ (31,808) |  |  |  |  |  |
Equity securities, FV-NI, unrealized loss |  |  |  |  |  |  | 42,405 |  |  |  |  |  |
Partnership investment interests |  |  |  |  |  | 21,145 |  | $ 15,867 |  |  |  |  |
Fair value assets |  |  |  |  |  | 238,994 |  | 289,461 |  |  |  |  |
Senior notes payable, net |  |  |  |  |  | 1,370,769 |  | 1,530,561 |  |  |  |  |
Fair value |  |  |  |  |  | 520,846 |  | 769,476 |  |  |  |  |
Notes payable, fair value disclosure |  |  |  |  |  | 197,888 |  | 243,779 |  |  |  |  |
Equity method investments |  |  |  |  |  | 95,440 |  | 85,487 |  |  |  |  |
Loss from equity investments |  |  |  |  |  | 552 | 4 |  |  |  |  |  |
Noncontrolling interest, common stock percent |  |  |  |  |  |  |  |  | 0.60% |  |  |  |
Noncontrolling interest, continues to own percent |  |  |  |  |  |  |  |  | 89.40% |  |  |  |
Noncontrolling interest |  |  |  |  |  | 1,575 |  |  | $ 1,575 |  |  |  |
Variable interest entity, primary beneficiary, maximum loss exposure, amount |  |  |  |  |  | 2,334 |  | 2,057 |  |  |  |  |
Agent fees |  |  |  |  |  | 0 | 372 |  |  |  |  |  |
Number of brand apparel operating companies | company |  |  |  |  |  |  |  |  |  |  |  |  | 2
Repayments of notes payable | [1] |  |  |  |  | $ 12,834 | $ 5,361 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash fee percentage |  |  |  |  |  | 7.00% |  |  |  |  |  |  |
Carried interest percentage |  |  |  |  |  | 8.00% |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash fee percentage |  |  |  |  |  | 10.00% |  |  |  |  |  |  |
Carried interest percentage |  |  |  |  |  | 15.00% |  |  |  |  |  |  |
Weighted Average | Discounted cash flow |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, measurement input |  |  |  |  |  |  |  |  | 0.75 |  |  |  |
Weighted Average | Market approach |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, measurement input |  |  |  |  |  |  |  |  | 0.25 |  |  |  |
GA Holdings |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 82,013 |  | 82,462 |  |  |  |  |
Loss from equity investments |  |  |  |  |  | 449 |  |  |  |  |  |  |
GA Joann Retail Partnership, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | 6,163 |  |  |  |  |  |  |
Loss from equity investments |  |  |  |  |  | 0 |  |  |  |  |  |  |
SW-B. Riley Retail |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | 7,264 |  | 3,025 |  |  |  |  |
Significant unobservable inputs (Level 3) |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assets |  |  |  |  |  | $ 126,126 |  | $ 130,619 |  |  |  |  |
Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total assets measured in Level 3 of the hierarchy level |  |  |  |  |  | 8.30% |  | 7.30% |  |  |  |  |
B&W |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments, fair value disclosure |  |  |  |  |  | $ 18,455 |  | $ 45,012 |  |  |  |  |
Rate of equity interests |  |  |  |  |  | 28.00% |  |  |  |  |  |  |
Synchronoss |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest entity ownership percentage |  |  |  |  |  | 3.00% |  |  |  |  |  |  |
Synchronoss Technologies, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments, fair value disclosure |  |  |  |  |  | $ 3,337 |  | $ 7,200 |  |  |  |  |
GA Holdings |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of equity interests |  |  |  |  |  |  |  |  |  |  |  | 44.20% |
GA Joann Retail Partnership, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of equity interests |  |  |  |  |  |  |  |  |  | 47.40% |  |  |
BRC Partners Opportunity Fund, LP |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of equity interests |  |  |  |  |  |  |  |  |  |  | 86.60% |  |
BRC Partners Opportunity Fund, LP | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of equity interests |  |  |  |  |  |  |  | 10.70% |  |  |  |  |
BRC Partners Opportunity Fund, LP | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of equity interests |  |  |  |  |  |  |  | 22.60% |  |  |  |  |
Bicoastal Alliance, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of equity interests |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Gain on sale and deconsolidation of businesses |  |  |  |  |  | 28,411 |  |  |  |  |  |  |
Bicoastal Alliance, LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of notes payable |  | $ 700 |  |  |  |  |  |  |  |  |  |  |
Related Party | Minimum | BRC Partners Opportunity Fund, LP |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership, percentage |  |  |  |  |  |  |  |  |  |  | 13.40% |  |
Related Party | Maximum | BRC Partners Opportunity Fund, LP |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership, percentage |  |  |  |  |  |  |  |  |  |  | 58.20% |  |
Related Party | FRG Investment |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of equity interests |  |  |  |  | 31.00% |  |  |  |  |  |  |  |
Freedom VCM Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments, fair value disclosure |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Purchase of equity investments |  |  |  |  | $ 216,500 |  |  |  |  |  |  |  |
Take-private transaction, vote or disposal, amount of shares |  |  |  |  | 64,644 |  |  |  |  |  |  |  |
Repurchase amount |  |  |  |  | 20,911 |  |  |  |  |  |  |  |
Freedom VCM Holdings, LLC | Conn’s |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, percentage of ownership after transaction |  |  |  | 49.99% |  |  |  |  |  |  |  |  |
Proceeds |  |  | $ 69,900 | $ 69,900 |  |  |  |  |  |  |  |  |
Freedom VCM Holdings, LLC | Preferred Stock | Conn’s |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consummated units (in shares) | shares |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |
Freedom VCM Holdings, LLC | Nonvoting Common Stock | Conn’s |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, convertible, shares issuable | shares |  |  |  | 24,540,295 |  |  |  |  |  |  |  |  |
Freedom VCM Receivables, Inc. | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on sale of financing receivable |  |  |  |  | 78 |  |  |  |  |  |  |  |
Payments to acquire finance receivables |  |  |  |  | $ 58,872 |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 19.74% |  |  |  |  |  |  |  |
Other Equity Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments, fair value disclosure |  |  |  |  |  | $ 17,006 |  | $ 29,562 |  |  |  |  |
Equity method investment, number of private companies | investment |  |  |  |  |  | 3 |  | 5 |  |  |  |  |
FRG | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of equity investments |  |  |  |  | $ 281,144 |  |  |  |  |  |  |  |
[1] | Amounts presented contain results from both continuing and discontinued operations. Refer to Note 3 - Discontinued Operations and Assets Held for Sale for additional information regarding cash flow associated with the results of discontinued operations.

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