Segment Reporting - Net Revenues, Expenses and Total Assets by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2022	Aug. 31, 2021	Nov. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 1,120,929	$ 1,650,030	$ 3,792,228	$ 5,396,814
Non-interest expenses	997,785	1,090,309	3,043,154	3,736,624
Non-interest expenses			3,043,100
Earnings before income taxes	123,144	559,721	749,074	1,660,190
Assets	51,182,848		51,182,848		$ 54,768,900
Investment Banking and Capital Markets
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	1,134,700	1,650,300	3,714,900	5,182,200
Non-interest expenses	968,000	1,060,800	2,939,200	3,623,400
Earnings before income taxes	166,700	589,500	775,700	1,558,800
Assets	48,297,000		48,297,000		51,697,400
Asset Management
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	(13,800)	(300)	77,300	214,600
Non-interest expenses	29,800	29,500	103,900	113,200
Earnings before income taxes	(43,600)	$ (29,800)	(26,600)	$ 101,400
Assets	$ 2,885,800		$ 2,885,800		$ 3,071,500