| DISTRIBUTIONS TO COMMON STOCKHOLDERS - Dividends Declared (Details) - $ / shares | 12 Months Ended | ||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sep. 30, 2024 | Aug. 30, 2024 | Jul. 31, 2024 | Jun. 28, 2024 | May 31, 2024 | Apr. 30, 2024 | Mar. 29, 2024 | Feb. 29, 2024 | Jan. 31, 2024 | Dec. 29, 2023 | Nov. 30, 2023 | Oct. 31, 2023 | Sep. 29, 2023 | Sep. 15, 2023 | Aug. 31, 2023 | Jul. 31, 2023 | Jun. 30, 2023 | May 31, 2023 | Apr. 28, 2023 | Mar. 31, 2023 | Feb. 28, 2023 | Jan. 31, 2023 | Dec. 30, 2022 | Nov. 30, 2022 | Oct. 31, 2022 | Sep. 30, 2024 | Sep. 30, 2023 | |
| Equity [Abstract] | |||||||||||||||||||||||||||
| Distribution per Common Share (in USD per share) | $ 0.165 | $ 0.165 | $ 0.165 | $ 0.165 | $ 0.165 | $ 0.165 | $ 0.165 | $ 0.165 | $ 0.165 | $ 0.165 | $ 0.165 | $ 0.165 | $ 0.165 | $ 0.04 | $ 0.165 | $ 0.165 | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.14 | $ 0.14 | $ 0.14 | $ 1.98 | $ 1.89 | 
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- References No definition available. 
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