Investments - Jefferies Finance - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 29, 2024	Nov. 30, 2023
Guarantee Obligations [Line Items]
Other assets (includes assets pledged of $321,367 and $244,604)	$ 3,215,855	$ 2,650,640
Payables to customers	4,202,162	3,960,557
Jefferies Finance, LLC
Guarantee 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, LLC | Corporate Joint Venture
Guarantee Obligations [Line Items]
Other assets (includes assets pledged of $321,367 and $244,604)	1,100	3,500
Payables to customers	$ 400	$ 2,600
Jefferies Finance, LLC | Jefferies Finance, LLC
Guarantee Obligations [Line Items]
Ownership percentage	50.00%