Combined Statements of Assets and Liabilities (Parentheticals) - USD ($)	6 Months Ended	12 Months Ended
	Sep. 30, 2025	Mar. 31, 2025
Investment in ether, at cost	$ 76,013,644	$ 37,851,948
Common stock, no par value (in Dollars per share)	$ 0	$ 0
Common stock, shares authorized, unlimited (in Shares)	Unlimited	Unlimited
Franklin Ethereum ETF [Member]
Investment in ether, at cost	$ 76,013,644	$ 37,851,948
Common stock, no par value (in Dollars per share)	$ 0	$ 0
Common stock, shares authorized, unlimited (in Shares)	Unlimited	Unlimited