Segment Reporting - Net Revenues, Expenses and Total Assets by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2022	Nov. 30, 2021		Nov. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 5,978,838	$ 8,013,826	[1]	$ 5,850,521	[1]
Non-interest expenses	4,923,200
Non-interest expenses	4,923,276	5,759,721	[1]	4,783,438	[1]
Earnings before income taxes	1,055,562	2,254,105	[1]	1,067,083	[1]
Total assets	51,057,683	56,107,311	[1]
Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	5,983,900	8,010,400		5,844,100
Non-interest expenses	4,917,900	5,756,300		4,779,400
Earnings before income taxes	1,066,000	2,254,100		1,064,700
Segment Reconciling Items
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	(5,100)	3,400		6,400
Non-interest expenses	5,300	3,400		4,000
Earnings before income taxes	(10,400)	0		2,400
Investment Banking and Capital Markets
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	45,541,000	50,912,300
Investment Banking and Capital Markets | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	4,726,200	6,917,800		5,029,500
Non-interest expenses	3,950,900	4,730,600		3,920,700
Earnings before income taxes	775,300	2,187,200		1,108,800
Asset Management
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	5,516,700	5,195,000
Asset Management | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	1,257,700	1,092,600		814,600
Non-interest expenses	967,000	1,025,700		858,700
Earnings before income taxes	$ 290,700	$ 66,900		$ (44,100)

[1] See Note 1 for a description of financial statement presentation changes made as a result of our Merger with Jefferies Group.