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INVESTMENTS - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Sep. 30, 2022
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Investments, Debt and Equity Securities [Abstract] |  |
2023 | $ 8,790 |
2024 | 48,181 |
2025 | 81,691 |
2026 | 155,294 |
2027 | 253,672 |
Thereafter | 36,975 |
Total contractual repayments | 584,603 |
Adjustments to cost basis of debt investments | (1,126) |
Investments in equity securities | 57,299 |
Investment owned, at cost | 640,776 | $ 656,053
Debt investments with maturity dates prior to period end | $ 300 |

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- Definition Cost of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 + Details
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