Secure 2.0 - Additional Information (Detail)	Nov. 30, 2025 USD ($)
EBP 005 [Member]
Employee Benefit Plan Secure [Line Items]
Employee benefit plan amount of emergency withdrawals	$ 1,000

Employee Benefit Plan Amount Of Emergency Withdrawals Of Domestic Abuse Qualified Birth And Qualified Declared Disaster

No definition available.

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