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Securitization Activities - Activity Related to Securitizations Accounted for as Sales (Details) - USD ($) $ in Millions	3 Months Ended
	Feb. 28, 2026	Feb. 28, 2025
Transfers and Servicing [Abstract]
Transferred assets	$ 1,368.7	$ 42.0
Proceeds on new securitizations	1,368.7	42.0
Cash flows received on retained interests	$ 14.9	$ 6.4

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- Definition

Assets transferred due to securitization activities in which the Company had continuing involvement.

+ References

No definition available.

+ Details

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Namespace Prefix:	jef_
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Balance Type:	debit
Period Type:	duration

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- Definition

Proceeds On New Securitizations

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No definition available.

+ Details

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Namespace Prefix:	jef_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

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- Definition

Cash Flows between a transferor and a transferee attributable to newly transferred assets related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-3

+ Details

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- References

No definition available.

+ Details

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