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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Schedule of Investments [Abstract]    
Cost of investment in gold bullion $ 548,310 $ 554,189
Common stock , no par value $ 0 $ 0
Common stock, shares authorized Unlimited Unlimited