Long-Term Debt - Summary of Long-Term Debt Carrying Values Including Unamortized Discounts and Premiums (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2022	Nov. 30, 2021		Nov. 30, 2020
Debt Instrument [Line Items]
Long-term debt	$ 8,774,086	$ 9,125,745	[1]
Gain (losses) recognized in interest expense of Jeffries Group	6,863	16,662		$ 4,856
Long term debt, at fair value	1,583,828	1,843,598
Fair value, inputs, level 2 and level 3
Debt Instrument [Line Items]
Long term debt, at fair value	8,460,000	$ 9,850,000
5.500% Senior Notes
Debt Instrument [Line Items]
Interest rate		5.50%
HomeFed EB-5 Program Debt | Subsidiaries
Debt Instrument [Line Items]
Long-term debt	209,060	$ 203,132
HomeFed Construction Loan | Subsidiaries
Debt Instrument [Line Items]
Long-term debt	56,965	45,581
Unsecured long-term debt
Debt Instrument [Line Items]
Long-term debt	$ 7,474,530	8,002,852
Unsecured long-term debt | 5.500% Senior Notes
Debt Instrument [Line Items]
Effective Interest Rate	5.47%
Long-term debt	$ 393,048	440,120
Unsecured long-term debt | 1.000% Euro Medium Term Notes
Debt Instrument [Line Items]
Interest rate	1.00%
Effective Interest Rate	1.00%
Long-term debt	$ 519,970	564,985
Unsecured long-term debt | 4.500% Callable Note due 2025
Debt Instrument [Line Items]
Interest rate	4.50%
Effective Interest Rate	4.84%
Long-term debt	$ 6,153	0
Unsecured long-term debt | 5.000% Callable Note due 2026
Debt Instrument [Line Items]
Interest rate	5.00%
Effective Interest Rate	5.52%
Long-term debt	$ 8,554	0
Unsecured long-term debt | 4.850% Senior Notes
Debt Instrument [Line Items]
Interest rate	4.85%
Effective Interest Rate	6.29%
Long-term debt	$ 703,533	775,550
Unsecured long-term debt | 4.850% Senior Notes | Interest rate swaps
Debt Instrument [Line Items]
Gain (losses) recognized in interest expense of Jeffries Group	$ 219,100	58,500
Unsecured long-term debt | 6.450% Senior Debentures
Debt Instrument [Line Items]
Interest rate	6.45%
Effective Interest Rate	5.46%
Long-term debt	$ 363,915	366,556
Unsecured long-term debt | 5.000% Callable Note due 2027
Debt Instrument [Line Items]
Interest rate	5.00%
Effective Interest Rate	5.22%
Long-term debt	$ 24,784	0
Unsecured long-term debt | 5.000% Callable Note due 2028
Debt Instrument [Line Items]
Interest rate	5.00%
Effective Interest Rate	5.29%
Long-term debt	$ 9,888	0
Unsecured long-term debt | 4.150% Senior Notes
Debt Instrument [Line Items]
Interest rate	4.15%
Effective Interest Rate	4.26%
Long-term debt	$ 991,518	990,525
Unsecured long-term debt | 2.625% Senior Debentures (1)
Debt Instrument [Line Items]
Interest rate	2.625%
Effective Interest Rate	3.90%
Long-term debt	$ 911,777	988,059
Unsecured long-term debt | 2.750% Senior Debentures (1)
Debt Instrument [Line Items]
Interest rate	2.75%
Effective Interest Rate	5.67%
Long-term debt	$ 392,162	460,724
Unsecured long-term debt | 6.250% Senior Notes
Debt Instrument [Line Items]
Interest rate	6.25%
Effective Interest Rate	6.03%
Long-term debt	$ 497,681	505,267
Unsecured long-term debt | 6.500% Senior Notes
Debt Instrument [Line Items]
Interest rate	6.50%
Effective Interest Rate	6.09%
Long-term debt	$ 409,472	409,926
Unsecured long-term debt | 6.625% Senior Notes
Debt Instrument [Line Items]
Interest rate	6.625%
Effective Interest Rate	6.61%
Long-term debt	$ 246,954	246,888
Unsecured long-term debt | Floating Rate Senior Notes
Debt Instrument [Line Items]
Effective Interest Rate	3.72%
Long-term debt	$ 61,715	61,703
Unsecured long-term debt | Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Effective Interest Rate	5.29%
Long-term debt	$ 349,578	348,951
Unsecured long-term debt | Structured notes
Debt Instrument [Line Items]
Long-term debt	1,583,828	1,843,598
Secured long-term debt
Debt Instrument [Line Items]
Long-term debt	100,000	100,000
Secured long-term debt | Secured Credit Facilities
Debt Instrument [Line Items]
Long-term debt	$ 933,531	$ 774,180

[1] See Note 1 for a description of financial statement presentation changes made as a result of our Merger with Jefferies Group.