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SIGNIFICANT ACCOUNTING POLICIES - Digital Assets in Underlying Index and Weight (Details) - Franklin Crypto Index ETF [Member]	Sep. 30, 2026	Sep. 30, 2025
Bitcoin [Member]
SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Weight of Digital Asset	76.58%	83.408%
Ether [Member]
SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Weight of Digital Asset	12.69%	16.592%
XRP [Member]
SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Weight of Digital Asset	5.35%
Solana [Member]
SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Weight of Digital Asset	3.75%
Dogecoin [Member]
SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Weight of Digital Asset	0.76%
Cardano [Member]
SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Weight of Digital Asset	0.53%
Stellar Lumens [Member]
SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Weight of Digital Asset	0.34%