| DISTRIBUTIONS TO COMMON STOCKHOLDERS - Dividends Declared (Details) - $ / shares | 12 Months Ended | ||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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, 2022 | Aug. 31, 2022 | Jul. 29, 2022 | Jun. 30, 2022 | May 31, 2022 | Apr. 29, 2022 | Mar. 31, 2022 | Feb. 28, 2022 | Jan. 31, 2022 | Dec. 31, 2021 | Nov. 30, 2021 | Oct. 29, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | |
| Equity [Abstract] | |||||||||||||||||||||||||||
| Common stock dividends paid (in USD per share) | $ 0.0825 | $ 0.02 | $ 0.0825 | $ 0.0825 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.07 | $ 0.07 | $ 0.07 | $ 0.0675 | $ 0.0675 | $ 0.0675 | $ 0.0675 | $ 0.0675 | $ 0.0675 | $ 0.065 | $ 0.065 | $ 0.065 | $ 0.065 | $ 0.065 | $ 0.065 | $ 0.9425 | $ 0.795 | 
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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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