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Securitization Activities - Activity Related to Securitizations Accounted for as Sales (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
May 31, 2025 | May 31, 2024 | May 31, 2025 | May 31, 2024
Transfers and Servicing [Abstract] |  |  |  |
Transferred assets | $ 2,591.4 | $ 1,910.0 | $ 2,633.4 | $ 3,412.0
Proceeds on new securitizations | 2,591.4 | 1,910.0 | 2,633.4 | 3,412.0
Cash flows received on retained interests | $ 6.5 | $ 9.0 | $ 11.1 | $ 19.1

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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_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds On New Securitizations + References No definition available. + Details
Name: | jef_ProceedsOnNewSecuritizations
Namespace Prefix: | jef_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- References No definition available. + Details
Name: | us-gaap_TransfersAndServicingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration