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INVESTMENTS - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
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Investments, Debt and Equity Securities [Abstract] |  |
2023 | $ 5,709 |
2024 | 35,783 |
2025 | 82,772 |
2026 | 158,184 |
2027 | 269,559 |
Thereafter | 85,828 |
Total contractual repayments | 637,835 |
Adjustments to cost basis of debt investments | (1,362) |
Investments in equity securities | 59,558 |
Investment owned, at cost | 696,031 | $ 656,053
Debt investments with maturity dates prior to period end | $ 200 |

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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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