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Securitization Activities - Summary of Retained Interests in SPEs (Details) - USD ($) $ in Millions	Nov. 30, 2024	Nov. 30, 2023
Securitization Vehicles [Line Items]
Total RMBS securitization assets	$ 3,956.8	$ 5,595.1
Total CMBS securitization assets	1,817.1	3,014.3
CLOs	9,001.9	6,323.8
Consumer and other loans	1,424.4	1,877.8
U.S. government agency RMBS
Securitization Vehicles [Line Items]
Retained Interests	105.7	417.3
U.S. government agency CMBS
Securitization Vehicles [Line Items]
Retained Interests	91.8	197.3
CLOs
Securitization Vehicles [Line Items]
Retained Interests	37.2	23.3
Consumer and other loans
Securitization Vehicles [Line Items]
Retained Interests	$ 52.1	$ 68.1

X

- Definition

Represents unpaid principal amount of assets in commercial mortgage backed securitization vehicles at the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	jef_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Collateralized Loan Obligations Securitization Assets

+ References

No definition available.

+ Details

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Namespace Prefix:	jef_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Other Securitization Assets

+ References

No definition available.

+ Details

Name:	jef_OtherSecuritizationAssets
Namespace Prefix:	jef_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents unpaid principal amount of assets in residential mortgage backed securitization vehicles at the balance sheet date.

+ References

No definition available.

+ Details

Name:	jef_RmbsSecuritizationAssets
Namespace Prefix:	jef_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Securitization vehicles.

+ References

No definition available.

+ Details

Name:	jef_SecuritizationVehiclesLineItems
Namespace Prefix:	jef_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value portion of interest continued to be held by a transferor after transferring financial assets to a third party.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=jef_UsGovernmentAgencyIssuedCmbsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CollateralizedLoanObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Period Type: