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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (A-H) (Details) |  |  |  |  |  | 3 Months Ended | 4 Months Ended | 9 Months Ended |  |  |  |  |  |  |
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Dec. 17, 2024 USD ($) | Feb. 14, 2024 USD ($) | Aug. 21, 2023 USD ($) | Sep. 23, 2022 USD ($) | Dec. 20, 2021 USD ($) | Sep. 30, 2024 USD ($) loan loan_receivable | Sep. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Feb. 05, 2025 USD ($) | Sep. 30, 2024 USD ($) loan loan_receivable | Sep. 30, 2023 USD ($) | Feb. 07, 2025 USD ($) | May 03, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) loan_receivable | Dec. 18, 2023 USD ($) | Jan. 12, 2023 USD ($) | Sep. 09, 2022 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value |  |  |  |  |  | $ 151,704,000 |  |  |  | $ 151,704,000 |  |  |  |  | $ 532,419,000 |  |  |
Loans receivable, at fair value |  |  |  |  |  | $ 151,704,000 |  |  |  | $ 151,704,000 |  |  |  |  | $ 532,419,000 |  |  |
Number of existing loan receivable | loan_receivable |  |  |  |  |  | 2 |  |  |  | 2 |  |  |  |  | 2 |  |  |
Loans receivable, fair value disclosure, maximum loss exposure |  |  |  |  |  |  |  |  |  | $ 78,406,000 |  |  |  |  |  |  |  |
Advertising costs |  |  |  |  |  | $ 1,477,000 | $ 5,911,000 |  |  | 6,155,000 | $ 16,462,000 |  |  |  |  |  |  |
Financing receivable, unamortized loan cost (fee) and purchase premium (discount) |  |  |  |  |  | 3,210,000 |  |  |  | 3,210,000 |  |  |  |  | $ 7,755,000 |  |  |
Fair value, option, aggregate differences, loans and long-term receivables |  |  |  |  |  | 291,176,000 |  |  |  | 291,176,000 |  |  |  |  | 23,463,000 |  |  |
Financing receivable, unrealized gain (loss) |  |  |  |  |  | (73,360,000) | 859,000 |  |  | 267,713,000 | 51,807,000 |  |  |  |  |  |  |
Financing receivable, nonaccrual |  |  |  |  |  | $ 67,274,000 |  |  |  | $ 67,274,000 |  |  |  |  | $ 41,236,000 |  |  |
Nonaccrual to outstanding, percent |  |  |  |  |  | 44.30% |  |  |  | 44.30% |  |  |  |  | 7.70% |  |  |
Financing receivable, 90 days or more past due, still accruing |  |  |  |  |  | $ 322,792,000 |  |  |  | $ 322,792,000 |  |  |  |  | $ 43,326,000 |  |  |
Fair value, option, credit risk, gains (losses) on assets |  |  |  |  |  | (71,746,000) | (759,000) |  |  | (259,163,000) | 45,350,000 |  |  |  |  |  |  |
Financing receivable, amount exceed fair value |  |  |  |  |  | $ 294,385,000 |  |  |  | $ 294,385,000 |  |  |  |  | 31,218,000 |  |  |
Number of loans | loan |  |  |  |  |  | 2 |  |  |  | 2 |  |  |  |  |  |  |  |
Secured Debt | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 52,500,000
Secured Debt | Term Loan | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 148,200,000 |  |  |  | $ 49,890,000 |  |  |  |  |  |  |  |  | $ 78,296,000 |
Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, historical cost, fair value |  |  |  |  |  | $ 442,880,000 |  |  |  | $ 442,880,000 |  |  |  |  | 555,882,000 |  |  |
Loans receivable |  |  |  |  |  | 446,089,000 |  |  |  | 446,089,000 |  |  |  |  | 563,637,000 |  |  |
Freedom VCM Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value |  |  |  |  |  | 3,141,000 |  |  |  | 3,141,000 |  |  |  |  | 20,624,000 |  |  |
Fair value, concentration of risk, loans receivable |  |  |  |  |  | 9,310,000 |  |  |  | 9,310,000 |  |  |  |  |  |  |  |
Interest rate |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid, equal to the greater of net after-tax proceeds, percentage |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid, equal to the greater of gross proceeds, percentage |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Take-private transaction, price |  |  | $ 227,296,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments, fair value disclosure |  |  |  |  |  | 0 |  |  |  | 0 |  |  |  |  | $ 232,065,000 |  |  |
Freedom VCM Holdings, LLC | First Priority Security Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value |  |  | 200,506,000 |  |  | $ 2,250,000 |  |  |  | $ 2,250,000 |  |  |  |  |  |  |  |
Loans receivable, fair value disclosure, loan portfolio percentage |  |  |  |  |  | 1.50% |  |  |  | 1.50% |  |  |  |  | 37.70% |  |  |
Principal amount |  |  |  |  |  | $ 224,968,000 |  |  |  | $ 224,968,000 |  |  |  |  | $ 200,506,000 |  |  |
Paid-in-kind interest |  |  |  |  |  |  |  |  |  | 24,462,000 |  |  |  |  |  |  |  |
Interest receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,889,000 |  |  |
Brian Kahn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value, concentration of risk, loans receivable |  |  |  |  |  | 2,250,000 |  |  |  | 2,250,000 |  |  |  |  |  |  |  |
W.S. Badcock Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire finance receivables |  |  |  | $ 168,363,000 | $ 400,000,000 |  |  | $ 145,278,000 |  |  |  |  |  |  |  |  |  |
Nogin Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,980,000 |  |  |
Debtor in possession commitment fund |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,000,000 | 17,530,000 |  |  |
Financing commitment, additional funds |  |  |  |  |  | 3,000,000 |  |  |  | 3,000,000 |  |  |  | $ 15,470,000 |  |  |  |
Financing commitment, payable in kind fees |  |  |  |  |  | 1,700,000 |  |  |  | 1,700,000 |  |  |  |  |  |  |  |
Financing commitment, payment |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,500,000 |  |  |  |  |
Subsequent Event | Freedom VCM Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value |  |  |  |  |  |  |  |  |  |  |  | $ 2,154,000 |  |  |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value |  |  |  |  |  | 98,292,000 |  |  |  | 98,292,000 |  |  |  |  | 378,768,000 |  |  |
Related Party | Freedom VCM Receivables, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value |  |  |  |  |  | 9,310,000 |  |  |  | 9,310,000 |  |  |  |  | 42,183,000 |  |  |
Payments to acquire finance receivables |  |  | 58,872,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of financing receivable |  |  | $ (78,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 19.74% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conn’s |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, fair value adjustment |  |  |  |  |  | (18,600,000) |  |  |  | (27,084,000) |  |  |  |  |  |  |  |
Conn’s | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan receivable, amount of consideration received | $ 27,738,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Lien Loan | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan receivable, amount of consideration received, interest | $ 238,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retail Industry |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes payable |  |  |  |  |  | 12,451,000 |  |  |  | 12,451,000 |  |  |  |  | 62,808,000 |  |  |
Loans receivable, at fair value |  |  |  |  |  | $ 76,156,000 |  |  |  | $ 76,156,000 |  |  |  |  | $ 167,568,000 |  |  |
Loans receivable, fair value disclosure, loan portfolio percentage |  |  |  |  |  | 50.20% |  |  |  | 50.20% |  |  |  |  | 31.50% |  |  |
Retail Industry | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  | $ 7,717,000 |  |  |  |  |  |  |  |  |
Retail Industry | Conn’s | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 108,000,000 |  |
Proceeds from collection of finance receivables |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes payable |  | $ 93,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value |  |  |  |  |  | $ 63,705,000 |  |  |  | $ 63,705,000 |  |  |  |  |  |  |  |
Freedom VCM Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, fair value adjustment |  |  |  |  |  | (54,333,000) |  |  |  | (222,718,000) |  |  |  |  |  |  |  |
Other fixed income securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | $ 6,359,000 | $ 38,368,000 |  |  | $ 65,055,000 | $ 106,572,000 |  |  |  |  |  |  |

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