Investments - Jefferies Finance - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2024	Nov. 30, 2023
Guarantor Obligations [Line Items]
Other assets	$ 3,072,302	$ 2,650,640
Payables to customers	4,073,975	3,960,557
Jefferies Finance
Guarantor Obligations [Line Items]
Equity commitment	750,000
Total committed equity capitalization of JFIN	1,500,000
Unfunded portion of equity commitment to subsidiary	$ 15,400
Extension period	1 year
Termination notice period	60 days
Committed line of credit facility amount	$ 500,000
Funded portion of loan commitment	0
Loan commitment	250,000
Jefferies Finance | Corporate Joint Venture
Guarantor Obligations [Line Items]
Other assets	1,900	3,500
Payables to customers	$ 13,700	$ 2,600
Jefferies Finance | Jefferies Finance
Guarantor Obligations [Line Items]
Ownership percentage	50.00%