Revenues from Contracts with Customers - Components of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2022	Feb. 28, 2021
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 1,187,070	$ 1,247,513
Principal transactions	260,026	791,219
Revenue from strategic affiliates	26,982	30,470
Interest	212,790	219,021
Other	65,791	60,588
Total revenues	1,752,659	2,348,811
Commissions and other fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	229,453	236,938
Investment banking
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	945,048	1,003,662
Asset management fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 12,569	$ 6,913