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Regulatory Requirements - Net Capital and Excess Net Capital (Details) $ in Thousands	Feb. 28, 2026 USD ($)
Jefferies LLC
Net Capital Requirements [Line Items]
Net Capital	$ 1,448,011
Excess Net Capital	1,277,695
JFSI - SEC
Net Capital Requirements [Line Items]
Net Capital	333,245
Excess Net Capital	298,800
JFSI - CFTC
Net Capital Requirements [Line Items]
Net Capital	333,245
Excess Net Capital	300,126
JIL
Net Capital Requirements [Line Items]
Net Capital	2,095,104
Excess Net Capital	1,045,119
Jefferies GmbH
Net Capital Requirements [Line Items]
Net Capital	386,316
Excess Net Capital	$ 158,187

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- Definition

Net Capital Requirements [Line Items]

+ References

No definition available.

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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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