Related Parties - Additional Information (Detail)	12 Months Ended			39 Months Ended
	Sep. 30, 2025 USD ($) Right shares	Sep. 30, 2024 USD ($) Right shares	Sep. 30, 2023 USD ($) Right	Sep. 30, 2025 USD ($) Right shares	Jun. 30, 2022 USD ($)	Mar. 02, 2022 USD ($)
Related Party Transaction [Line Items]
Shares of the Trust, held by related parties | shares	3,062,111	3,372,214		3,062,111
Related party sponsor fee percentage	2.50%
Number of incidental rights held | Right	0	0		0
Number of Incidental Rights distributed | Right	0	0	0
Additional trust expenses paid by sponsor	$ 0	$ 0	$ 0
Maximum
Related Party Transaction [Line Items]
Common stock value, shares authorized						$ 10,000,000
Sponsor
Related Party Transaction [Line Items]
Related party maximum transaction in a fiscal year	600,000
Sponsor's Fees	245,851	140,374	$ 146,899
Sponsor's Fee payable, related party	0	$ 0		$ 0
Non Sponsor
Related Party Transaction [Line Items]
Related party maximum transaction in a fiscal year	$ 600,000
DCG
Related Party Transaction [Line Items]
Number of shares purchased under authorization | shares				0
DCG | Maximum
Related Party Transaction [Line Items]
Amount of the Trust, held by related parties					$ 10,000.00