Variable Interest Entities (Assets And Liabilities Of Consolidated VIEs) (Details) - USD ($) $ in Thousands		Feb. 28, 2019	Nov. 30, 2018
Variable Interest Entity [Line Items]
Financial instruments owned		$ 17,949,093	$ 18,873,142
Securities purchased under agreement to resell		3,496,570	2,785,758
Receivables		7,228,766	6,287,401
Other		2,001,708	1,859,561
Total assets	[1]	48,959,345	47,131,095
Other secured financings		1,527,393	1,534,271
Total liabilities	[1]	38,858,023	36,907,059
Jefferies Group
Variable Interest Entity [Line Items]
Secured financings eliminated in consolidation		326,600	1,000
Consolidation adjustments
Variable Interest Entity [Line Items]
Intercompany payables		47,100	44,100
Securitization Vehicles
Variable Interest Entity [Line Items]
Financial instruments owned		323,400	0
Securities purchased under agreement to resell		936,300	883,100
Receivables		613,500	626,000
Other		33,000	78,400
Total assets		1,906,200	1,587,500
Other secured financings		1,853,300	1,535,300
Other		48,600	45,900
Total liabilities		$ 1,901,900	$ 1,581,200

[1] Total assets include assets related to variable interest entities of $971.5 million and $704.4 million at February 28, 2019 and November 30, 2018, respectively, and Total liabilities include liabilities related to variable interest entities of $1,528.2 million and $1,535.8 million at February 28, 2019 and November 30, 2018, respectively. See Note 8 for additional information related to variable interest entities.