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Statements of Assets and Liabilities (Parenthetical) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Mar. 31, 2026	Jun. 30, 2025
Schedule of Investments [Abstract]
Cost of investment in platinum bullion	$ 182,134	$ 65,762
Common stock, shares authorized	Unlimited	Unlimited

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Cost of the investment.

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