REGULATORY AUTHORITIES - Additional Information (Detail)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)
LFNY
Regulatory Requirements [Line Items]
Minimum net capital requirement as defined under exchange act	$ 5,000
Regulatory capital	86,388,000
Regulatory capital in excess of minimum requirement	$ 80,804,000
Aggregate indebtedness to net capital ratio	0.97
U.K. Subsidiaries
Regulatory Requirements [Line Items]
Regulatory capital	$ 171,625,000
Regulatory capital in excess of minimum requirement	98,640,000
CFLF
Regulatory Requirements [Line Items]
Regulatory capital		$ 153,263,000
Regulatory capital in excess of minimum requirement		54,335,000
Combined European Regulated Group
Regulatory Requirements [Line Items]
Regulatory capital		176,085,000
Regulatory capital in excess of minimum requirement		$ 68,858,000
Other U.S. and Non-U.S. Subsidiaries
Regulatory Requirements [Line Items]
Regulatory capital	107,788,000
Regulatory capital in excess of minimum requirement	$ 84,389,000