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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (I-K) (Details) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) investment | Dec. 18, 2023 USD ($) shares | Aug. 21, 2023 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) investment | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) investment | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) investment | Oct. 25, 2024 investment
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Equity securities, FV-NI, unrealized gain (loss) |  |  |  |  | $ (153,027) | $ 4,318 | $ (185,519) | $ (13,530) |  |
Equity method investment, number of investments | investment | 5 |  |  |  | 5 |  | 5 |  | 5 |
Equity method investment, number of investments with significant influence | investment | 4 |  |  |  | 4 |  | 4 |  |  |
Equity method investments, fair value disclosure | $ 287,987 |  |  |  | $ 287,987 |  | $ 287,987 |  | $ 283,057 |
Equity securities, FV-NI, unrealized loss |  |  |  |  | 180,964 |  | 223,369 |  |  |
Partnership investment interests |  |  |  |  |  |  | 15,609 |  | 35,196 |
Fair value assets | 811,925 |  |  |  | 811,925 |  | 811,925 |  | 1,524,874 |
Senior notes payable | 1,528,565 |  |  |  | 1,528,565 |  | 1,528,565 |  | 1,668,021 |
Fair value | 1,124,630 |  |  |  | 1,124,630 |  | 1,124,630 |  | 1,127,503 |
Notes payable, fair value disclosure | 631,243 |  |  |  | 631,243 |  | 631,243 |  | 688,343 |
Realized gain (loss), foreign currency transaction, before tax |  |  |  |  | 694 | $ 353 | 2,962 | $ 587 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, number of investments sold | investment |  |  |  |  |  |  |  |  |  | 2
Significant unobservable inputs (Level 3) |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value assets | $ 632,168 |  |  |  | $ 632,168 |  | $ 632,168 |  | $ 1,268,057 |
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 | 19.50% |  |  |  | 19.50% |  | 19.50% |  | 20.90% |
FRG |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investments, fair value disclosure | $ 63,674 |  |  |  | $ 63,674 |  | $ 63,674 |  | $ 287,043 |
Purchase of equity investments |  |  | $ 281,144 |  |  |  |  |  |  |
Equity method investment, fair value adjustment |  |  |  |  |  |  | 391,754 |  |  |
FRG | Subsequent Event |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investments, fair value disclosure |  |  |  | $ 0 |  |  |  |  |  |
Equity method investment, fair value adjustment |  |  |  | $ (63,674) |  |  |  |  |  |
Other Equity Investments |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investments, fair value disclosure | $ 38,416 |  |  |  | $ 38,416 |  | $ 38,416 |  | $ 87,713 |
Equity method investment, number of private companies | investment | 5 |  |  |  | 5 |  | 5 |  | 6 |
Freedom VCM Holdings, LLC |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investments, fair value disclosure | $ 51,478 |  |  |  | $ 51,478 |  | $ 51,478 |  | $ 232,065 |
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% |  |  |  |  |  |  |  |
Sale of stock, consideration received on transaction | $ 69,900 | $ 69,900 |  |  |  |  |  |  |  |
Freedom VCM Holdings, LLC | Preferred Stock | Conn’s |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | shares |  | 1,000,000 |  |  |  |  |  |  |  |
Freedom VCM Holdings, LLC | Nonvoting Common Stock | Conn’s |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, convertible, shares issuable (in shares) | shares |  | 24,540,295 |  |  |  |  |  |  |  |
Freedom VCM Receivables, Inc. | Related Party |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of financing receivable |  |  | (78) |  |  |  |  |  |  |
Payments to acquire finance receivables |  |  | $ 58,872 |  |  |  |  |  |  |
Interest rate |  |  | 19.74% |  |  |  |  |  |  |
Brand Investment | Subsequent Event |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Rate of equity interests |  |  |  |  |  |  |  |  |  | 80.00%
FRG Investment |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Rate of equity interests |  |  | 31.00% |  |  |  |  |  |  |
B&W |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Rate of equity interests | 30.00% |  |  |  | 30.00% |  | 30.00% |  |  |
Equity method investments, fair value disclosure | $ 39,797 |  |  |  | $ 39,797 |  | $ 39,797 |  | 40,072 |
Synchronoss Technologies, Inc. |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Rate of equity interests | 13.00% |  |  |  | 13.00% |  | 13.00% |  |  |
Equity method investments, fair value disclosure | $ 13,149 |  |  |  | $ 13,149 |  | $ 13,149 |  | $ 8,780 |
Minimum | Brand Investment |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Rate of equity interests | 10.00% |  |  |  | 10.00% |  | 10.00% |  |  |
Maximum | Brand Investment |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Rate of equity interests | 50.00% |  |  |  | 50.00% |  | 50.00% |  |  |
Maximum | Other Four Investments |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Rate of equity interests | 20.00% |  |  |  | 20.00% |  | 20.00% |  |  |

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