Regulatory Authorities - Additional Information (Detail) - USD ($)	Sep. 30, 2022	Jun. 30, 2022
LFNY [Member]
Regulatory Requirements [Line Items]
Specified fixed percentage, minimum required capital	6.67%
Minimum net capital requirement as defined under exchange act	$ 5,000
Regulatory capital	76,509,000
Regulatory capital in excess of minimum requirement	$ 70,877,000
Aggregate indebtedness to net capital ratio	1.10
LFNY [Member] | Maximum [Member]
Regulatory Requirements [Line Items]
Aggregate indebtedness to net capital ratio	15
U.K. Subsidiaries [Member]
Regulatory Requirements [Line Items]
Regulatory capital	$ 154,119,000
Regulatory capital in excess of minimum requirement	101,511,000
CFLF [Member]
Regulatory Requirements [Line Items]
Regulatory capital		$ 148,433,000
Regulatory capital in excess of minimum requirement		80,917,000
Combined European Regulated Group [Member]
Regulatory Requirements [Line Items]
Regulatory capital		172,680,000
Regulatory capital in excess of minimum requirement		$ 94,820,000
Other U.S. and Non-U.S. Subsidiaries [Member]
Regulatory Requirements [Line Items]
Regulatory capital	165,159,000
Regulatory capital in excess of minimum requirement	$ 139,702,000