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Regulatory Requirements - Net Capital and Excess Net Capital (Details) $ in Thousands	Aug. 31, 2025 USD ($)
Jefferies LLC
Net Capital Requirements [Line Items]
Net Capital	$ 2,204,515
Excess Net Capital	2,061,318
JFSI - SEC
Net Capital Requirements [Line Items]
Net Capital	310,701
Excess Net Capital	290,345
JFSI - CFTC
Net Capital Requirements [Line Items]
Net Capital	310,701
Excess Net Capital	$ 283,646

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- Definition

Net Capital Requirements [Line Items]

+ References

No definition available.

+ Details

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- Definition

Amount of net capital in excess of minimum required net capital, calculated under Alternative Standard.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Rule 15c3-1
-Number 240
-Section 15c3-1
-Publisher SEC

+ Details

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- Definition

Amount of net capital of broker-dealer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Rule 15c3-1
-Number 240
-Section 15c3-1
-Publisher SEC

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