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DISTRIBUTIONS TO COMMON STOCKHOLDERS - Components Of Our Net Assets On A Tax Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | --- | --- | ---
Equity [Abstract] |  |  |  |  |
Common stock |  | $ 44 | $ 35 |  |
Capital in excess of par value | [1] | 481,480 | 395,542 |  |
Cumulative net unrealized appreciation (depreciation) of investments |  | (17,454) | (6,438) |  |
Undistributed ordinary income |  | 4,978 | 0 |  |
Capital loss carryforward |  | (54,425) | (62,910) |  |
Other temporary differences |  | (5,928) | (10,742) |  |
TOTAL NET ASSETS |  | $ 408,695 | $ 315,487 | $ 318,439 | $ 233,743
[1] | Refer to Note 9—Distributions to Common Stockholders for additional information.

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- Definition Amount of excess of issue price over par or stated value of stock and from other transaction involving stock or stockholder. Includes, but is not limited to, additional paid-in capital (APIC) for common and preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481372/852-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(18)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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