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Significant Accounting Policies (Details) - Schedule of Organizational Expenses - USD ($)
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Schedule of Organizational Expenses [Abstract]      
Undistributed ordinary income $ 2,389,267 $ 265,798
Accumulated capital and other losses [1] (512,809,528) (485,107,934) (490,032,788)
Other temporary differences (57,438) (73,646) (89,856)
Unrealized appreciation/(depreciation) (37,631,079) (69,376,916) (55,318,332)
Components of distributable earnings/(accumulated deficits) at year end $ (548,108,778) $ (554,558,496) $ (545,175,178)
[1] Under the Regulated Investment Company Modernization Act of 2010, net capital losses recognized for tax years beginning after December 22, 2010, may be carried forward indefinitely, and their character is retained as short-term or long-term losses. As of September 30, 2023, the Company had a long-term capital loss carryforward available to offset future realized capital gains of $509,966,576 and a short-term capital loss carryforward of $2,842,952