Segment Reporting - Net Revenues, Expenses and Total Assets by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2025	Feb. 29, 2024	Nov. 30, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 1,593,019	$ 1,738,203
Non-interest expenses	1,441,954	1,517,961
Non-interest expenses	1,441,900	1,518,000
Earnings from continuing operations before income tax expense	151,065	220,242
Assets	70,218,891		$ 64,360,309
Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	1,590,700	1,724,700
Non-interest expenses	1,441,900	1,518,000
Earnings from continuing operations before income tax expense	148,800	206,700
Segment Reconciling Items
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	2,300	13,500
Non-interest expenses	0	0
Earnings from continuing operations before income tax expense	2,300	13,500
Investment Banking and Capital Markets
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets	64,896,600		59,142,900
Investment Banking and Capital Markets | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	1,399,000	1,451,300
Non-interest expenses	1,232,000	1,296,300
Earnings from continuing operations before income tax expense	167,000	155,000
Asset Management
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets	5,322,300		$ 5,217,400
Asset Management | Operating Segments
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	191,700	273,400
Non-interest expenses	209,900	221,700
Earnings from continuing operations before income tax expense	$ (18,200)	$ 51,700