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Consolidated Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2024
Sep. 30, 2023
Investments at cost $ 1,489,679 $ 1,092,878
Cash and cash equivalents at cost 125,246 100,555
Credit facility payable, cost $ 168,855 $ 9,400
Common stock, shares, issued 63,228,138 58,734,702
Common stock, shares, outstanding 63,228,138 58,734,702
Common stock par value $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Two Thousand And Thirty One Asset Backed Debt [Member]    
Asset-backed debt payable, par $ 226,259 $ 228,000
Two Thousand And Thirty Six Asset Backed Debt [Member]    
Asset-backed debt payable, par 287,000 287,000
2023 Notes Payable    
Notes payable, par 0 76,219
2026 Notes Payable    
Notes payable, par 185,000 185,000
Non-controlled, Non-affiliated Investments    
Investments at cost 1,164,243 768,240
Controlled, Affiliated Investments    
Investments at cost $ 325,436 $ 324,639