Revenues from Contracts with Customers - Components of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2022	Aug. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 939,906	$ 1,397,922	$ 2,986,352	$ 3,871,093
Principal transactions	217,188	225,797	700,571	1,342,075
Revenue from strategic affiliates	8,938	7,456	46,749	50,178
Interest	310,352	194,670	765,562	620,649
Other	(43,418)	28,902	64,981	156,259
Total revenues	1,432,966	1,854,747	4,564,215	6,040,254
Commissions and other fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	221,471	214,393	705,785	673,974
Investment banking
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	714,677	1,180,676	2,260,940	3,185,038
Asset management fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 3,758	$ 2,853	$ 19,627	$ 12,081