FINANCIAL HIGHLIGHTS - Schedule of Financial Highlights (Details) - Franklin Ethereum ETF [Member] - $ / shares		3 Months Ended		9 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
COMBINED FINANCIAL HIGHLIGHTS [Abstract]
Net asset value per Share, beginning of period (in Dollars per share)		$ 31.35	$ 19.98	$ 13.94	$ 26.21	[1]
Net investment loss (in Dollars per share)	[2]	(0.01)	0	(0.04)	0
Net realized and unrealized gain (loss) on investment in ether (in Dollars per share)		(8.8)	5.36	8.64	(0.87)
Net change in net assets from operations (in Dollars per share)	[3]	(8.81)	5.36	8.6	(0.87)
Net asset value per Share, end of period (in Dollars per share)		$ 22.54	$ 25.34	$ 22.54	$ 25.34
Total return, at net asset value	[4],[5]	(28.10%)	26.83%	61.69%	(3.32%)
Ratio to average net assets(f)
Net investment loss	[6]	(0.19%)	0.00%	(0.19%)	0.00%
Gross expenses	[6]	0.19%	0.19%	0.19%	0.19%
Net expenses	[6]	0.19%	0.00%	0.19%	0.00%

[1] The amount shown represents the NAV per share at July 23, 2024 (commencement of the Fund's investment operations). This amount includes proceeds to the Fund from the initial ether seed creation transaction conducted on June 27, 2024. Prior to June 27, 2024, 4,000 shares were acquired on May 21, 2024 at per share value of $25.00 (the “Initial Seed Shares”). Total proceeds to the Fund from the sale of the Initial Seed Shares were $100,000. On June 27, 2024, the Initial Seed Shares were redeemed for $100,000 and Franklin Resources Inc. (the "Seed Capital Investor")purchased two creation units in a cash transaction comprised of a total of 100,000 Shares at a per-Share price based on 380 ether per Creation Unit (or 0.0076 ether per Share), for a total of 760 ether (the “Seed Creation Units”). The cash proceeds to the Fund from the sale of the Seed Creation Units were used by the Fund to purchase 760 ether at the price of $3,446.37 per ether on June 27, 2024 (exclusive of transaction and other costs incurred in connection with the conversion of the cash proceeds to ether, which were paid by the Seed Capital Investor). Thus, the ultimate total proceeds to the Fund from the sale of the Seed Creation Units were $2,619,241.20 (an amount representing 760 ether).

[2] Calculated using average Shares outstanding.

[3] The amount shown for a share outstanding may not agree with the change in the aggregate gains and losses on investment for the period because of the timing of transactions in the Fund’s shares in relation to fluctuating market values for the Fund’s underlying investment.

[4] Calculation based on the change in net asset value of a Share during the period. Total return for periods of less than a year are not annualized.

[5] Total Return at NAV is calculated assuming an initial investment made at the NAV at the beginning of the period, and redemption of Shares at NAV on the last day of the period. Total Return at NAV as shown above includes adjustments in accordance with U.S. GAAP.

[6] Annualized.