Annual report pursuant to Section 13 and 15(d)

SUBSEQUENT EVENTS - Narrative (Details)

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SUBSEQUENT EVENTS - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 13, 2023
Sep. 30, 2023
Sep. 30, 2022
Subsequent Event [Line Items]      
Cost   $ 722,269 [1] $ 656,053 [2]
Line of credit commitment   $ 45,231 $ 74,846
Subsequent Event | Quality Environmental Midco, Inc.      
Subsequent Event [Line Items]      
Cost $ 11,000    
Line of credit commitment $ 2,000    
[1] Cumulative gross unrealized depreciation for federal income tax purposes is $56.9 million; cumulative gross unrealized appreciation for federal income tax purposes is $33.7 million. Cumulative net unrealized depreciation is $23.2 million, based on a tax cost of $728.0 million.
[2] Cumulative gross unrealized depreciation for federal income tax purposes is $52.3 million; cumulative gross unrealized appreciation for federal income tax purposes is $35.2 million. Cumulative net unrealized depreciation is $17.1 million, based on a tax cost of $666.7 million.