Portfolio Investments - Unconsolidated Significant Subsidiaries (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Aug. 31, 2026 |
Aug. 31, 2025 |
Aug. 31, 2024 |
|
| Investment Company, Nonconsolidated Subsidiary [Line Items] | |||||
| Total income | $ 151,741 | $ 157,624 | |||
| Operating expenses | (78,632) | (78,274) | |||
| Operating income | 76,359 | 79,350 | |||
| Net Income (loss) | (21,555) | 77,981 | $ 131,871 | $ (490,501) | $ 234,119 |
| NPRC | |||||
| Investment Company, Nonconsolidated Subsidiary [Line Items] | |||||
| Total income | 83,309 | 140,894 | |||
| Operating expenses | (48,841) | (55,098) | |||
| Operating income | 34,468 | 85,796 | |||
| Interest expense | (30,679) | (43,785) | |||
| Depreciation and amortization | (24,299) | (26,547) | |||
| Fair value adjustment | (1,503) | (2,642) | |||
| Net Income (loss) | (22,013) | 12,822 | |||
| First Tower, LLC | |||||
| Investment Company, Nonconsolidated Subsidiary [Line Items] | |||||
| Total income | 101,060 | 88,288 | |||
| Operating income | 30,569 | 26,018 | |||
| Net Income (loss) | $ 4,852 | $ 3,056 | |||
| X | ||||||||||
- Definition Fair Value Adjustment No definition available.
|
| X | ||||||||||
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of interest expense classified as nonoperating. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of expenses related to the generation of investment income. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount, after expense and tax, of investment income classified as operating. Excludes realized and unrealized gain (loss) on investment. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|