Investments - Summary of Selected Financial Information for Jefferies Finance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2024	Aug. 31, 2023	Aug. 31, 2024	Aug. 31, 2023	Nov. 30, 2023
Schedule of Equity Method Investments [Line Items]
Total assets	$ 63,275,098		$ 63,275,098		$ 57,905,161
Total liabilities	53,159,331		53,159,331		48,102,620
Net earnings attributable to members	181,039	$ 53,947	492,118	$ 191,955
Jefferies Finance, LLC
Schedule of Equity Method Investments [Line Items]
Total assets	5,374,400		5,374,400		5,598,200
Total liabilities	4,031,300		4,031,300		4,352,000
Net earnings attributable to members	28,800	(31,500)	68,100	(3,700)
Jefferies Finance, LLC
Schedule of Equity Method Investments [Line Items]
Unfunded commitment fees	300	300	900	900
Our total equity balance	664,200		664,200		$ 630,100
Origination and syndication fee revenues	72,900	37,900	200,200	84,100
Origination fee expenses	16,200	10,100	40,800	20,500
CLO placement and structuring fee revenues	800	1,700	1,100	1,700
Investment fund placement fee revenues	2,400	0	3,300	0
Service fees	$ 15,300	$ 20,100	$ 81,000	$ 81,200