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Fair Value Disclosures - Contractual Principal Exceeds Fair Value for Loans and Other Receivables (Details) - USD ($) $ in Thousands	Feb. 28, 2026	Nov. 30, 2025
Financial instruments owned:
Loans and other receivables	$ 2,219,310	$ 2,378,747
Loans and other receivables on nonaccrual status and/or 90 days or greater past due	420,878	319,394
Loans and other receivables 90 days or greater past due	70,748	100,300
Long-term debt	222,020	166,273
Other secured financings	$ (4,798)	$ 237

X

- Definition

Fair Value, Option, Aggregate Differences, Long-term And Short-Term Debt Instruments

+ References

No definition available.

+ Details

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Namespace Prefix:	jef_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Fair Value, Option, Aggregate Differences, Other Secured Financings

+ References

No definition available.

+ Details

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Namespace Prefix:	jef_
Data Type:	xbrli:monetaryItemType
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X

- Definition

This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (d)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

For loans held as assets for which the fair value option has been elected, this item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of those loans that are 90 days or more past due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (e)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

For loans held as assets for which the fair value option has been elected, this item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of those loans that are in nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (e)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

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Balance Type:	na
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