Segment Reporting - Net Revenues, Expenses and Total Assets by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 7,043,823	$ 5,197,477	$ 3,112,530
Non-interest expenses	4,859,870	4,020,023	2,787,861
Earnings before income taxes	2,183,953	1,177,454	324,669
Total assets	54,768,900	47,751,997
Investment Banking and Capital Markets
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	6,796,600	4,989,200	3,036,000
Non-interest expenses	4,699,400	3,869,300	2,688,900
Earnings before income taxes	2,097,200	1,119,900	347,100
Total assets	51,697,400	44,488,100
Asset Management
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	247,200	208,300	76,500
Non-interest expenses	160,400	150,700	98,900
Earnings before income taxes	86,800	57,600	$ (22,400)
Total assets	$ 3,071,500	$ 3,263,900