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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (A-L) (Details)								3 Months Ended			6 Months Ended		9 Months Ended
	Feb. 27, 2025 USD ($)	Dec. 17, 2024 USD ($)	Nov. 15, 2024 USD ($)	Dec. 18, 2023 USD ($) shares	Aug. 21, 2023 USD ($)	Sep. 23, 2022 USD ($)	Dec. 20, 2021 USD ($)	Jun. 30, 2025 USD ($) investment	Jun. 30, 2024 USD ($) investment	Mar. 31, 2023 USD ($)	Jun. 30, 2025 USD ($) investment	Jun. 30, 2024 USD ($) investment shares	Sep. 30, 2024 USD ($)	Jul. 01, 2025 USD ($)	May 21, 2025 USD ($)	Apr. 07, 2025 USD ($)	Mar. 26, 2025 USD ($)	Feb. 28, 2025	Feb. 07, 2025 loan	Dec. 31, 2024 USD ($) investment	Oct. 13, 2024 USD ($)	Feb. 14, 2024 USD ($)	Nov. 20, 2023	Nov. 02, 2023 USD ($)
Accounting Policies [Line Items]
Loan, transfer from held-for-sale to held-in-portfolio											$ 8,876,000	$ 22,576,000
(Loss) gain on extinguishment of debt											54,986,000	120,000
Nonredeemable noncontrolling interest, recognized											12,494,000
Noncontrolling interest								$ 1,575,000			1,575,000
Payments to noncontrolling interests											2,918,000
Share-based payment arrangement, decrease due to reclassification to liability awards											2,138,000
Warrants and rights outstanding								80,000			80,000				$ 590,000	$ 67,000	$ 863,000
Proceeds from sale of productive assets												2,000,000
Non-cash financing activity												42,077,000
Loans receivable, at fair value								$ 48,980,000			$ 48,980,000									$ 90,103,000
Nonaccrual to outstanding, percent								25.50%			25.50%									23.40%
Fair value, option, aggregate differences, loans and long-term receivables								$ 324,243,000			$ 324,243,000									$ 355,901,000
Financing receivable, unrealized gain (loss)								800,000	$ (175,582,000)		(7,296,000)	(187,783,000)
Financing receivable, nonaccrual								12,468,000			12,468,000									21,122,000
Financing receivable, 90 days or more past due, still accruing								319,822,000			319,822,000									321,544,000
Fair value, option, credit risk, gains (losses) on assets								800,000	(176,078,000)		(7,296,000)	(187,417,000)
Loans receivable, at fair value								48,980,000			48,980,000									90,103,000
Financing receivable, amount exceed fair value								223,500,000			223,500,000									222,911,000
Long-term debt, number of loans | loan																			2
Total Term Loans								1,323,727,000			1,323,727,000									1,530,561,000
Equity securities, FV-NI, unrealized gain (loss)								2,855,000	(153,027,000)		(13,127,000)	(185,519,000)
Equity securities, FV-NI, unrealized gains (losses)									$ 180,964,000			223,369,000
Partnership investment interests											22,069,000		$ 15,867,000
Fair value assets								200,075,000			200,075,000									289,461,000
Senior notes payable, net								1,323,727,000			1,323,727,000									1,530,561,000
Fair value								391,198,000			391,198,000									769,476,000
Notes payable, fair value disclosure								136,659,000			136,659,000									243,779,000
Nogin Inc.
Accounting Policies [Line Items]
Credit bid - Settlement of DIP Facility												$ 37,700,000
Significant unobservable inputs (Level 3)
Accounting Policies [Line Items]
Loans receivable, at fair value								48,980,000			48,980,000									90,103,000
Fair value assets								77,735,000			77,735,000									130,619,000
FRG Investment
Accounting Policies [Line Items]
Rate of equity interests					31.00%
B&W
Accounting Policies [Line Items]
Equity method investments, fair value disclosure								$ 26,406,000			$ 26,406,000									45,012,000
Rate of equity interests								27.00%			27.00%
Synchronoss
Accounting Policies [Line Items]
Variable interest entity, qualitative or quantitative information, ownership percentage											3.00%
Synchronoss Technologies, Inc.
Accounting Policies [Line Items]
Equity method investments, fair value disclosure								$ 1,970,000			$ 1,970,000									7,200,000
Other Equity Investments
Accounting Policies [Line Items]
Equity method investments, fair value disclosure								$ 17,853,000			$ 17,853,000									$ 29,562,000
Equity method investment, number of private companies | investment								3	5		3	5								5
FRG
Accounting Policies [Line Items]
Purchase of equity investments					$ 281,144,000
Common Stock, par value $0.0001 per share
Accounting Policies [Line Items]
Repurchase shares of common stock (in shares) | shares												36,903,000
Repurchase shares of common stock												$ 1,011,000
Senior Notes
Accounting Policies [Line Items]
Long-term debt, gross								$ 1,323,772,000			$ 1,323,772,000									$ 1,530,656,000
Total Term Loans								1,323,727,000			1,323,727,000									1,530,561,000
Line of Credit
Accounting Policies [Line Items]
Long-term debt, gross								135,035,000			135,035,000									205,569,000
Total Term Loans								$ 124,584,000			$ 124,584,000									199,429,000
6.375% Senior Notes due 2025 | Senior Notes
Accounting Policies [Line Items]
Interest rate								6.375%	6.375%		6.375%	6.375%						6.375%
Repayments of long-term debt												$ 1,130,000
Long-term debt, gross								$ 0			$ 0									145,211,000
5.50% Senior Notes due March 2026 | Senior Notes
Accounting Policies [Line Items]
Interest rate								5.50%			5.50%
Repayments of long-term debt											$ 115,844,000
5.00% Senior Notes due December 2026 | Senior Notes
Accounting Policies [Line Items]
Interest rate								5.00%			5.00%
Repayments of long-term debt											$ 126,766,000
5.25% Senior Notes due August 2028 | Senior Notes
Accounting Policies [Line Items]
Interest rate								5.25%			5.25%
Repayments of long-term debt											$ 23,096,000
6.00% Senior Notes due January 2028 | Senior Notes
Accounting Policies [Line Items]
Interest rate								6.00%			6.00%
Repayments of long-term debt											$ 46,429,000
8.00% Senior Notes due 2028 | Senior Notes
Accounting Policies [Line Items]
Repayments of long-term debt											247,468,000
Secured Debt | Senior Notes
Accounting Policies [Line Items]
Warrants and rights outstanding								$ 1,600,000			1,600,000
Secured Debt | Term Loan | Line of Credit
Accounting Policies [Line Items]
Warrants and rights outstanding								7,860,000			7,860,000
Debt instrument, exit fee amount								11,244,000			11,244,000
Principal amount						$ 148,200,000
Fair Value, Measurements, Recurring
Accounting Policies [Line Items]
Fair value, option, aggregate differences, loans and long-term receivables								373,224,000			373,224,000									446,004,000
Loans receivable								$ 224,968,000			$ 224,968,000									$ 224,968,000
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
Accounting Policies [Line Items]
Percentage of total assets measured in Level 3 of the hierarchy level								5.00%			5.00%									7.30%
Freedom VCM Holdings, LLC
Accounting Policies [Line Items]
Interest rate					12.00%
Loans receivable, at fair value																				$ 2,169,000
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					$ 216,500,000
Loans receivable, fair value adjustment								$ (866,000)	$ (151,147,000)		$ (589,000)	$ (168,385,000)
Equity method investments, fair value disclosure					0
Purchase of equity investments					216,500,000
Take-private transaction, vote or disposal, amount of shares					64,644,000
Repurchase amount					20,911,000
Freedom VCM Holdings, LLC | Conn’s
Accounting Policies [Line Items]
Sale of stock, percentage of ownership after transaction				49.99%
Proceeds				$ 69,900,000
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 Holdings, LLC | First Priority Security Interest
Accounting Policies [Line Items]
Loans receivable, at fair value					200,506,000			1,468,000			1,468,000									2,057,000
Take-private transaction, price					$ 227,296,000
W.S. Badcock Corporation
Accounting Policies [Line Items]
Payments to acquire finance receivables						$ 168,363,000	$ 400,000,000			$ 145,278,000
Related Party
Accounting Policies [Line Items]
Loans receivable, at fair value								$ 19,370,000			$ 19,370,000									51,902,000
Related Party | FRG Investment
Accounting Policies [Line Items]
Rate of equity interests					31.00%
Related Party | FRG
Accounting Policies [Line Items]
Purchase of equity investments					$ 281,144,000
Related Party | Freedom VCM Receivables, Inc.
Accounting Policies [Line Items]
Loans receivable, at fair value																				$ 3,913,000
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]
Nonaccrual to outstanding, percent								22.50%			22.50%									43.10%
Loan receivable, amount of consideration received		$ 27,738,000
Exela Technologies, Inc
Accounting Policies [Line Items]
Nonaccrual to outstanding, percent								60.50%			60.50%									35.70%
Torticity, LLC | Related Party
Accounting Policies [Line Items]
Loans receivable, at fair value																								$ 15,369,000
Loans receivable, fair value disclosure, drawn																								$ 6,690,000
Loans receivable, basis spread on variable rate																							15.00%	15.00%
Torticity, LLC | Related Party | Cash
Accounting Policies [Line Items]
Loans receivable, basis spread on variable rate																							7.50%
Torticity, LLC | Related Party | Payment in Kind (PIK) Note
Accounting Policies [Line Items]
Loans receivable, basis spread on variable rate																							7.50%
Torticity, LLC | Related Party | B.Riley Principal Investments, LLC ("BRPI")
Accounting Policies [Line Items]
Loans receivable, at fair value																								$ 25,000,000
Loans receivable, fair value disclosure, drawn																								$ 15,000,000
GA Holdings | Related Party | Revolving Credit Facility
Accounting Policies [Line Items]
Debt instrument, basis spread on variable rate			4.75%
GA Holdings | Related Party | Revolving Credit Facility | Line of Credit
Accounting Policies [Line Items]
Borrowing capacity credit facility			$ 25,000,000					$ 40,000,000			$ 40,000,000			$ 25,000,000
Line of credit, outstanding								4,700,000			4,700,000									$ 1,698,000	$ 1,698,000
Retail Industry
Accounting Policies [Line Items]
Gain (loss) on sales of loans, net											(38,100,000)
Long-term debt, gross																				6,082,000
Total Term Loans																				45,826,000
Retail Industry | Freedom VCM Receivables, Inc.
Accounting Policies [Line Items]
Total Term Loans																				39,744,000
Retail Industry | Conn’s | Related Party
Accounting Policies [Line Items]
Loans receivable, at fair value				$ 108,000,000
Loans receivable, at fair value								11,000,000			11,000,000									19,065,000
Long-term debt, gross								89,000,000			89,000,000									93,000,000		$ 93,000,000
Debt instrument, floor, percentage				4.80%
Debt instrument, basis spread on variable rate				8.00%
Debt instrument, unamortized discount								2,705,000			2,705,000									2,705,000
Loans receivable, exceeded fair value disclosure								75,295,000			75,295,000									71,230,000
Retail Industry | First Lien Loan
Accounting Policies [Line Items]
Loans receivable, at fair value																				19,761,000
Retail Industry | Torticity, LLC | Related Party
Accounting Policies [Line Items]
Loans receivable, at fair value								$ 16,333,000			$ 16,333,000									16,333,000
Retail Industry | GA Holdings | Related Party
Accounting Policies [Line Items]
Long-term debt, gross																				$ 1,339,000
Retail Industry | Joann Retail | Related Party
Accounting Policies [Line Items]
Borrowing capacity credit facility	$ 52,000,000
Retail Industry | BR Financial | Related Party
Accounting Policies [Line Items]
Debt instrument, basis spread on variable rate	10.00%
Borrowing capacity credit facility	$ 24,653,000

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