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Regulatory Authorities - Additional Information (Detail) - USD ($) | Jun. 30, 2022 | Mar. 31, 2022
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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 | 63,059,000 |
Regulatory capital in excess of minimum requirement | $ 58,868,000 |
Aggregate indebtedness to net capital ratio | 1.00 |
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 | $ 143,683,000 |
Regulatory capital in excess of minimum requirement | 86,005,000 |
CFLF [Member] |  |
Regulatory Requirements [Line Items] |  |
Regulatory capital |  | $ 131,148,000
Regulatory capital in excess of minimum requirement |  | 62,075,000
Combined European Regulated Group [Member] |  |
Regulatory Requirements [Line Items] |  |
Regulatory capital |  | 149,268,000
Regulatory capital in excess of minimum requirement |  | $ 69,552,000
Other U.S. and Non-U.S. Subsidiaries [Member] |  |
Regulatory Requirements [Line Items] |  |
Regulatory capital | 190,739,000 |
Regulatory capital in excess of minimum requirement | $ 163,830,000 |

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- Definition Minimum amount of net capital required to be maintained by broker-dealer and its subsidiary, calculated under Aggregate Indebtedness Standard. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Amount of total risk-based capital exceeding minimum required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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