Revenues from Contracts with Customers - Components of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2022	May 31, 2021
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 859,376	$ 1,225,658	$ 2,046,446	$ 2,473,171
Principal transactions	223,357	325,059	483,383	1,116,278
Revenue from strategic affiliates	10,829	12,252	37,811	42,722
Interest	242,420	206,958	455,210	425,979
Other	42,608	66,769	108,399	127,357
Total revenues	1,378,590	1,836,696	3,131,249	4,185,507
Commissions and other fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	254,861	222,643	484,314	459,581
Investment banking
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	601,215	1,000,700	1,546,263	2,004,362
Asset management fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 3,300	$ 2,315	$ 15,869	$ 9,228