Revenues from Contracts with Customers - Components of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2024	Aug. 31, 2023	Aug. 31, 2024	Aug. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 1,222,645	$ 844,959	$ 3,229,408	$ 2,373,368
Revenues	2,595,589	2,040,915	7,663,827	5,472,661
Investment banking
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	925,635	600,190	2,343,284	1,595,463
Revenues	927,094	600,190	2,344,743	1,595,463
Commissions and other fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	270,643	223,712	787,968	672,294
Revenues	270,643	223,712	787,968	672,294
Asset management fees and revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	7,189	5,344	43,539	27,965
Revenues	11,986	14,812	74,126	67,731
Oil and gas revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	358	228	799	25,997
Real estate revenues
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	4,038	1,902	10,727	12,105
Other contracts with customers
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	14,782	13,583	43,091	39,544
Revenues	124,579	(49,212)	439,556	(96,509)
Principal transactions
Disaggregation of Revenue [Line Items]
Revenues	324,501	353,373	1,381,432	1,171,578
Revenues from affiliates
Disaggregation of Revenue [Line Items]
Revenues	6,256	9,468	32,046	39,766
Interest
Disaggregation of Revenue [Line Items]
Revenues	936,786	898,040	2,636,002	2,062,104
Other
Disaggregation of Revenue [Line Items]
Revenues	$ 105,401	$ (64,925)	$ 384,939	$ (174,155)