Loans to and Investments in Associated Companies - Jefferies Finance (Details)	3 Months Ended
	Feb. 28, 2022 USD ($) businessLine	Feb. 28, 2021 USD ($)	Nov. 30, 2021 USD ($)
Investments In Associated Companies [Line Items]
Other assets	$ 2,512,638,000		$ 2,352,247,000
Payables, expense accruals and other liabilities	10,430,914,000		13,612,367,000
Jefferies Finance
Investments In Associated Companies [Line Items]
Equity commitment	$ 15,400,000
Investment commitment extension	1 year
Investment commitment termination notice period	60 days
Total line of credit facility commitment under joint venture	$ 500,000,000
Termination notice	60 days
Line of credit facility, commitment of Jefferies, funded	$ 0
Line of credit facility commitment of Jefferies	250,000,000
Jefferies Finance | Mass Mutual
Investments In Associated Companies [Line Items]
Equity commitment	$ 750,000,000
Jefferies Finance
Investments In Associated Companies [Line Items]
Extension period	1 year
Other assets	$ 37,200,000		26,200,000
Payables, expense accruals and other liabilities	$ 2,500,000		$ 8,500,000
Jefferies Finance | Jefferies Finance
Investments In Associated Companies [Line Items]
Equity method investment, ownership percentage	50.00%
Number of business lines | businessLine	2
Jefferies Finance | Jefferies Group
Investments In Associated Companies [Line Items]
Interest income and unfunded commitment fees related to facility commitment	$ 400,000	$ 600,000