Investments - Jefferies Finance - Narrative (Details)	12 Months Ended
	Nov. 30, 2023 USD ($) advisor businessLine	Nov. 30, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of advisors | advisor	3
Other assets	$ 2,650,640,000	$ 3,595,985,000
Payables to customers	$ 3,960,557,000	3,578,854,000
Jefferies Finance
Schedule of Equity Method Investments [Line Items]
Number of business lines | businessLine	2
Total committed equity capitalization	$ 1,500,000,000
Unfunded portion of equity commitment to subsidiary	$ 15,400,000
Extension period	1 year
Termination notice period	60 days
Funded portion of loan commitment	$ 0
Loan commitment	250,000,000
Jefferies Finance | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Other assets	3,500,000	1,200,000
Payables to customers	2,600,000	$ 500,000
Jefferies Finance | Committed advances
Schedule of Equity Method Investments [Line Items]
Committed line of credit facility amount	500,000,000
Mass Mutual
Schedule of Equity Method Investments [Line Items]
Equity commitment	$ 750,000,000
Jefferies Finance | Jefferies Finance
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%