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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (I-K) (Details) $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 03, 2024 USD ($) | Sep. 30, 2024 USD ($) investment | Jun. 30, 2024 USD ($) | Dec. 18, 2023 USD ($) shares | Aug. 21, 2023 USD ($) | Sep. 30, 2024 USD ($) investment | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) investment | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) investment
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Equity securities, FV-NI, unrealized gain (loss) |  |  |  |  |  | $ (25,748) | $ (72,583) | $ (217,370) | $ (77,710) |
Equity securities, FV-NI, unrealized loss |  |  |  |  |  | 63,674 |  | 287,043 |  |
Partnership investment interests |  |  |  |  |  |  |  | 16,238 |  | $ 35,196
Fair value assets |  | $ 411,500 |  |  |  | 411,500 |  | 411,500 |  | 1,241,817
Senior notes payable |  | 1,529,560 |  |  |  | 1,529,560 |  | 1,529,560 |  | 1,668,021
Fair value |  | 727,965 |  |  |  | 727,965 |  | 727,965 |  | 1,127,503
Notes payable, fair value disclosure |  | 534,246 |  |  |  | 534,246 |  | 534,246 |  | 688,343
Realized gain (loss), foreign currency transaction, before tax |  |  |  |  |  | (1,836) | $ 322 | 231 | $ (170) |
Significant unobservable inputs (Level 3) |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value assets |  | $ 213,652 |  |  |  | $ 213,652 |  | $ 213,652 |  | $ 985,000
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 |  | 9.90% |  |  |  | 9.90% |  | 9.90% |  | 16.20%
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 |  | $ 55,991 |  |  |  | $ 55,991 |  | $ 55,991 |  | $ 40,072
Synchronoss Technologies, Inc. |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Rate of equity interests |  | 7.00% |  |  |  | 7.00% |  | 7.00% |  |
Equity method investments, fair value disclosure |  | $ 11,212 |  |  |  | $ 11,212 |  | $ 11,212 |  | 8,780
FRG |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of equity investments |  |  |  |  | $ 281,144 |  |  |  |  |
Equity method investment, fair value adjustment |  | (63,674) |  |  |  |  |  | (509,761) |  |
Equity method investments, fair value disclosure |  | 0 |  |  |  | 0 |  | 0 |  | 287,043
FRG | Subsequent Event |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, fair value adjustment | $ 0 |  |  |  |  |  |  |  |  |
Other Equity Investments |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investments, fair value disclosure |  | $ 50,595 |  |  |  | $ 50,595 |  | $ 50,595 |  | $ 87,713
Equity method investment, number of private companies | investment |  | 5 |  |  |  | 5 |  | 5 |  | 6
Freedom VCM Holdings, LLC |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of equity investments |  |  |  |  | 216,500 |  |  |  |  |
Take-private transaction, vote or disposal, amount of shares |  |  |  |  | 64,644 |  |  |  |  |
Repurchase amount |  |  |  |  | 20,911 |  |  |  |  |
Equity method investments, fair value disclosure |  | $ 0 |  |  |  | $ 0 |  | $ 0 |  | $ 232,065
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] |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of financing receivable |  |  |  |  | (78) |  |  |  |  |
Payments to acquire finance receivables |  |  |  |  | $ 58,872 |  |  |  |  |
Interest rate |  |  |  |  | 19.74% |  |  |  |  |

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