Investments - Summary of Selected Financial Information for Jefferies Finance (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2025	Feb. 29, 2024	Nov. 30, 2024
Schedule of Equity Method Investments [Line Items]
Total assets	$ 70,218,891		$ 64,360,309
Total liabilities	59,950,046		54,134,916
Total mezzanine equity	406		406
Net earnings (losses) attributable to members	136,849	$ 156,392
Jefferies Finance
Schedule of Equity Method Investments [Line Items]
Total assets	6,007,100		5,762,600
Total liabilities	4,669,900		4,415,600
Total mezzanine equity	13,800		14,400
Net earnings (losses) attributable to members	(1,700)	6,900
Jefferies Finance
Schedule of Equity Method Investments [Line Items]
Unfunded commitment fees	300	300
Our total investment balance	661,700		$ 666,300
Origination and syndication fee revenues	60,200	52,400
Origination fee expenses	18,500	14,900
CLO placement and structuring fee revenues	200	0
Investment fund placement fee revenues	600	500
Service fees	$ 54,400	$ 44,900