Variable Interest Entities - Assets and Liabilities of Consolidated VIEs Prior to Consolidation (Footnote) (Detail) (Securitization Vehicles [Member], USD $) In Millions, unless otherwise specified	Feb. 28, 2015	Nov. 30, 2014
Securitization Vehicles [Member]
Variable Interest Entity [Line Items]
Secured financing included in inventory and eliminated	$ 5.6	$ 39.7

Secured financing held by The Company in Inventory and eliminated in consolidation.

No definition available.

Name:	jef_VieSecuredFinancingEliminatedInConsolidation
Namespace Prefix:	jef_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant