Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2024	Nov. 30, 2023
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,847,856	$ 1,736,114
Currency translation and other adjustments	(2,266)	3,228
Measurement period adjustment	(26,230)
Goodwill relating to acquisitions by Tessellis	8,578	132,514
Goodwill reclassified as held for sale		(24,000)
Goodwill, ending balance	1,827,938	1,847,856
Goodwill	1,827,900	1,847,900
Investment Banking and Capital Markets
Goodwill [Roll Forward]
Goodwill, beginning balance	1,532,172	1,552,944
Currency translation and other adjustments	841	3,228
Measurement period adjustment	0
Goodwill relating to acquisitions by Tessellis	0	0
Goodwill reclassified as held for sale		(24,000)
Goodwill, ending balance	1,533,013	1,532,172
Asset Management
Goodwill [Roll Forward]
Goodwill, beginning balance	315,684	183,170
Currency translation and other adjustments	(3,107)	0
Measurement period adjustment	(26,230)
Goodwill relating to acquisitions by Tessellis	8,578	132,514
Goodwill reclassified as held for sale		0
Goodwill, ending balance	294,925	315,684
Goodwill	143,000	143,000
Investment banking
Goodwill [Roll Forward]
Goodwill	700,700	700,200
Equities and wealth management
Goodwill [Roll Forward]
Goodwill	255,400	255,300
Fixed income
Goodwill [Roll Forward]
Goodwill	576,900	576,600
Other investments
Goodwill [Roll Forward]
Goodwill	$ 151,900	$ 172,800