Segment Reporting - Net Revenues, Expenses and Total Assets by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Nov. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 2,129,366	$ 1,170,696
Non-interest expenses	1,458,196	935,318
Earnings before income taxes	671,170	235,378
Segment assets	51,386,411		$ 47,751,997
Investment Banking and Capital Markets
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	1,959,500	1,148,800
Non-interest expenses	1,416,200	898,900
Earnings before income taxes	543,300	249,900
Segment assets	48,694,600		44,488,100
Asset Management
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	169,900	21,900
Non-interest expenses	42,000	36,400
Earnings before income taxes	127,900	$ (14,500)
Segment assets	$ 2,691,800		$ 3,263,900