Segment Reporting - Net Revenues, Expenses and Total Assets by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Nov. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 1,170,696	$ 685,718
Non-interest expenses	935,318	623,133
Earnings before income taxes	235,378	62,585
Segment assets	46,202,597		$ 43,516,115
Investment Banking and Capital Markets:
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	1,148,800	658,200
Non-interest expenses	898,900	603,100
Earnings before income taxes	249,900	55,100
Segment assets	43,026,700		40,565,800
Asset Management:
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	21,900	27,500
Non-interest expenses	36,400	20,000
Earnings before income taxes	(14,500)	$ 7,500
Segment assets	$ 3,175,900		$ 2,950,300