Benefit Plans - Additional Information (Details) $ in Thousands, € in Millions		12 Months Ended
		Nov. 30, 2019 USD ($)	Nov. 30, 2018 USD ($)	Nov. 30, 2017 USD ($)	Dec. 28, 2017 USD ($)	Dec. 28, 2017 EUR (€)
Defined Benefit Plan Disclosure [Line Items]
Minimum pension liability adjustments	[1]	$ 1,318	$ (4,285)	$ (312)
United States
Defined Benefit Plan Disclosure [Line Items]
Employer contributions amount		$ 2,000	1,000
German Plan
Defined Benefit Plan Disclosure [Line Items]
Consideration for release of indemnity relating to pension obligations					$ 3,250
Minimum pension liability adjustments			$ 5,300
Jefferies Bache Limited | German Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension obligations and insurance contracts transfer amount | €						€ 6.5

[1] The amounts include income tax benefits (expenses) of $0.5 million, $(0.7) million and $0.1 million for the years ended November 30, 2019, 2018 and 2017, respectively. The amount during the year ended November 30, 2019 includes pension losses of $(0.1) million, which was reclassified to Compensation and benefits expenses within the Consolidated Statements of Earnings. The amount during the year ended November 30, 2018 includes $5.3 million related to the transfer of the German Pension Plan and $(0.3) million, net of taxes of $0.1 million, related to pension losses, which were reclassified to Compensation and benefits expenses within the Consolidated Statements of Earnings and $(0.8) million related to the Tax Act, which was reclassified to Member’s paid-in capital.