Revenues from Contracts with Customers - Components of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2021	Feb. 29, 2020
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 1,247,513	$ 775,941
Principal transactions	791,219	371,902
Revenue from strategic affiliates	30,470	7,316
Interest	219,021	294,668
Other	60,588	29,729
Total revenues	2,348,811	1,479,556
Commissions and other fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	236,938	179,535
Investment banking
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,003,662	592,002
Asset management fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 6,913	$ 4,404