Revenues from Contracts with Customers - Components of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2023	Nov. 30, 2022	Nov. 30, 2021
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	$ 3,233,208	$ 4,742,858	$ 6,141,801
Total revenues	7,441,399	7,149,263	8,945,464
Investment banking
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	2,169,366	2,807,822	4,365,699
Total revenues	2,169,366	2,807,822	4,365,699
Commissions and other fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	905,665	925,494	896,015
Total revenues	905,665	925,494	896,015
Asset management fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	33,867	23,525	14,836
Total revenues	82,574	80,264	72,084
Manufacturing revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	0	412,605	538,628
Oil and gas revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	26,284	302,135	182,973
Real estate revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	44,825	223,323	102,297
Other contracts with customers
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	53,201	47,954	41,353
Total revenues	1,837	1,318,288	1,038,012
Principal transactions
Disaggregation of Revenue [Line Items]
Other sources of revenue	1,413,283	833,757	1,617,336
Total revenues	1,413,283	833,757	1,617,336
Revenues from strategic affiliates
Disaggregation of Revenue [Line Items]
Other sources of revenue	48,707	56,739	57,248
Interest
Disaggregation of Revenue [Line Items]
Other sources of revenue	2,868,674	1,183,638	956,318
Total revenues	2,868,674	1,183,638	956,318
Other
Disaggregation of Revenue [Line Items]
Other sources of revenue	$ (122,473)	$ 332,271	$ 172,761