Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS - Fair Value Narrative (Details)

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BORROWINGS - Fair Value Narrative (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Apr. 10, 2023
Sep. 30, 2023
Mar. 31, 2023
Debt Instrument [Line Items]      
Fair Value   $ 915,636 $ 753,543 [1]
Collateral Pledged      
Debt Instrument [Line Items]      
Fair Value   $ 774,900 $ 639,500
Revolving Line of Credit | Line of Credit      
Debt Instrument [Line Items]      
Unused fee percentage     1.00%
Credit Facility | Line of Credit      
Debt Instrument [Line Items]      
Unused fee percentage   0.75%  
Credit Facility | Revolving Line of Credit | Line of Credit | Secured Overnight Financing Rate (SOFR)      
Debt Instrument [Line Items]      
Debt instrument, variable rate floor   0.35% 0.50%
Debt instrument, basis spread on variable rate 0.11% 3.25%  
Credit Facility | Revolving Line of Credit | Line of Credit | LIBOR      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate     2.94%
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $150.4 million; cumulative gross unrealized depreciation for federal income tax purposes is $119.3 million. Cumulative net unrealized appreciation is $31.1 million, based on a tax cost of $722.4 million.