Revenues from Contracts with Customers - Components of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2021	May 31, 2020
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 1,225,658	$ 632,995	$ 2,473,171	$ 1,408,936
Principal transactions	325,059	467,283	1,116,278	839,185
Revenue from strategic affiliates	12,252	2,339	42,722	9,655
Interest	206,958	211,941	425,979	506,609
Other	66,769	(47,275)	127,357	(17,546)
Total revenues	1,836,696	1,267,283	4,185,507	2,746,839
Commissions and other fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	222,643	243,267	459,581	422,802
Investment banking
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,000,700	387,491	2,004,362	979,493
Asset management fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 2,315	$ 2,237	$ 9,228	$ 6,641