Fair Value of BCH - Changes in Quantity of BCH and Respective Fair Value (Details) $ in Thousands	3 Months Ended	12 Months Ended
Jun. 30, 2026 USD ($) BitcoinCash	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)	Sep. 30, 2025 USD ($) BitcoinCash	Jun. 30, 2025 USD ($) BitcoinCash	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($) BitcoinCash	Jun. 30, 2026 USD ($) BitcoinCash	Jun. 30, 2025 USD ($) BitcoinCash	Jun. 30, 2024 USD ($) BitcoinCash
Fair Value Disclosures [Abstract]
Investment Owned, Balance \| BitcoinCash				392,285.62958128				344,528.53494921	392,285.62958128	344,528.53494921	304,664.86473559
BCH contributed \| BitcoinCash									0	57,237.79382476	47,623.1743038
BCH distributed for Sponsor's Fee, related party \| BitcoinCash									(9,685.89428777)	(9,480.69919269)	(7,759.50409018)
Net change in unrealized appreciation/depreciation on investment in BCH \| BitcoinCash									0	0	0
Net realized loss on investment in BCH \| BitcoinCash									0	0	0
Investment Owned, Balance \| BitcoinCash	382,599.73529351				392,285.62958128				382,599.73529351	392,285.62958128	344,528.53494921
Investment Owned, at Fair Value \| $				$ 202,961				$ 135,014	$ 202,961	$ 135,014	$ 92,012
BCH contributed \| $									0	22,983	22,716
BCH distributed for Sponsor's Fee, related party \| $									(4,811)	(3,665)	(2,469)
Net change in unrealized appreciation/depreciation on investment in BCH \| $	$ (103,541)	$ (49,845)	$ 14,778	15,979	$ 84,506	$ (52,339)	$ 34,484	(18,005)	(122,629)	48,646	23,205
Net realized gain (loss) on investment in BCH \| $	(85)	$ 333	$ 377	$ 412	6	$ (45)	$ 108	$ (86)	1,037	(17)	(450)
Investment Owned, at Fair Value \| $	$ 76,558				$ 202,961				$ 76,558	$ 202,961	$ 135,014