v3.26.1
FAIR VALUE OF FINANCIAL INSTRUMENTS - Reconciliation of Investments Measured at Fair Value Using Significant Unobservable Inputs Level 3 (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2026
First lien [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net change in unrealized appreciation (depreciation) reported within the net change in unrealized appreciation (depreciation) on investments in our Consolidated Statements of Operations attributable to our Level 3 assets still held at the reporting date   $ (148)
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance   0
Net change in unrealized appreciation (depreciation)   (121)
Purchases, net discount accretion   159,579
Proceeds from sales and repayments of investments   (1,087)
Ending Balance $ 158,371 158,371
Net change in unrealized appreciation (depreciation) reported within the net change in unrealized appreciation (depreciation) on investments in our Consolidated Statements of Operations attributable to our Level 3 assets still held at the reporting date (121)  
Fair Value, Inputs, Level 3 [Member] | First lien [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance   0
Net change in unrealized appreciation (depreciation)   (148)
Purchases, net discount accretion   157,699
Proceeds from sales and repayments of investments   (1,087)
Ending Balance 156,464 156,464
Fair Value, Inputs, Level 3 [Member] | Equity Funds [Member]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance   0
Net change in unrealized appreciation (depreciation)   27
Purchases, net discount accretion   1,880
Proceeds from sales and repayments of investments   0
Ending Balance 1,907 $ 1,907
Net change in unrealized appreciation (depreciation) reported within the net change in unrealized appreciation (depreciation) on investments in our Consolidated Statements of Operations attributable to our Level 3 assets still held at the reporting date $ 27