Revenues from Contracts with Customers - Components of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Revenues from contracts with customers:	$ 5,276,691	$ 3,333,939	$ 2,222,257
Principal transactions	1,505,618	1,867,013	769,258
Revenues from strategic affiliates	57,247	19,507	3,066
Interest	847,969	894,215	1,496,529
Other	219,762	37,632	93,422
Total revenues	7,907,287	6,152,306	4,584,532
Commissions and other fees
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Revenues from contracts with customers:	896,312	823,258	676,309
Investment banking
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Revenues from contracts with customers:	4,366,055	2,501,494	1,528,729
Asset management fees
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Revenues from contracts with customers:	$ 14,324	$ 9,187	$ 17,219