Investments - Summary of Selected Financial Information for Jefferies Finance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2024	May 31, 2023	Nov. 30, 2023
Schedule of Equity Method Investments [Line Items]
Total assets	$ 63,000,530		$ 63,000,530		$ 57,905,161
Total liabilities	53,047,938		53,047,938		48,102,620
Net earnings attributable to members	154,687	$ 8,684	311,079	$ 138,008
Jefferies Finance, LLC
Schedule of Equity Method Investments [Line Items]
Total assets	6,030,300		6,030,300		5,598,200
Total liabilities	4,716,200		4,716,200		4,352,000
Net earnings attributable to members	40,200	12,900	39,300	27,800
Jefferies Finance, LLC
Schedule of Equity Method Investments [Line Items]
Unfunded commitment fees	300	300	600	600
Our total equity balance	649,400		649,400		$ 630,100
Origination and syndication fee revenues	74,900	20,200	127,300	46,200
Origination fee expenses	9,700	6,300	24,600	10,400
CLO structuring fee revenues	300	0	300	0
Investment fund placement fee revenues	400	0	900	0
Service fees	$ 20,800	$ 16,900	$ 65,700	$ 61,100