Investments - Summary of Selected Financial Information for Jefferies Finance (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2019
Schedule of Equity Method Investments [Line Items]
Total assets	$ 54,768,900	$ 47,751,997
Liabilities	47,690,292	41,385,865
Net earnings (loss)	1,624,724	874,706	$ 244,385
Jefferies Finance
Schedule of Equity Method Investments [Line Items]
Interest income	1,500	2,400	0
Unfunded commitment fees	1,200	1,100	1,300
Total assets	8,258,700	7,199,500
Liabilities	6,843,900	5,990,400
Total equity	1,414,800	1,209,100
Our total equity balance	707,400	604,600
Net earnings (loss)	205,700	(74,900)	44,500
Origination and syndication fee revenues	410,500	198,100	176,300
Origination fee expenses	66,800	27,300	27,600
CLO placement fee revenues	5,700	1,700	6,000
Underwriting fees	2,500	1,700	3,900
Service fees	$ 85,100	$ 65,100	$ 60,800