Investments - Jefferies Finance - Narrative (Details)	12 Months Ended
	Nov. 30, 2021 USD ($) businessLine	Nov. 30, 2020 USD ($)	Nov. 30, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Interest expense	$ 863,464,000	$ 954,829,000	$ 1,472,002,000
Promissory note
Schedule of Equity Method Investments [Line Items]
Debt principal amount			1,000,000,000
Interest expense			$ 3,800,000
Jefferies Finance
Schedule of Equity Method Investments [Line Items]
Number of business lines | businessLine	2
Equity commitment	$ 750,000,000
Total committed equity capitalization	1,500,000,000
Unfunded portion of equity commitment to subsidiary	$ 42,600,000
Extension period	1 year
Termination notice period	60 days
Funded portion of loan commitment	$ 0
Loan commitment	250,000,000
Jefferies Finance | Other assets
Schedule of Equity Method Investments [Line Items]
Receivables under service agreement	26,200,000	24,200,000
Jefferies Finance | Accrued expense and other liabilities
Schedule of Equity Method Investments [Line Items]
Payables under service agreement	8,500,000	$ 13,700,000
Jefferies Finance | Committed advances
Schedule of Equity Method Investments [Line Items]
Committed line of credit facility amount	$ 500,000,000
Jefferies Finance | Jefferies Finance
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%