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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Feb. 29, 2024	May 31, 2025	May 31, 2024	Nov. 30, 2024
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,847,856	$ 1,827,938	$ 1,847,856
Currency translation and other adjustments		12,374	(67)
Measurement period adjustments		1,802	(28,346)
Goodwill relating to acquisitions by Tessellis			3,366
Goodwill, ending balance		1,842,114	1,822,809
Goodwill		1,842,100		$ 1,827,900
OpNet
Goodwill [Roll Forward]
Goodwill, beginning balance	127,100		127,100
Measurement period adjustments	27,000
Investment Banking and Capital Markets
Goodwill [Roll Forward]
Goodwill, beginning balance	1,532,172	1,533,013	1,532,172
Currency translation and other adjustments		4,457	357
Measurement period adjustments		0	0
Goodwill relating to acquisitions by Tessellis			0
Goodwill, ending balance		1,537,470	1,532,529
Asset Management
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 315,684	294,925	315,684
Currency translation and other adjustments		7,917	(424)
Measurement period adjustments		1,802	(28,346)
Goodwill relating to acquisitions by Tessellis			3,366
Goodwill, ending balance		304,644	$ 290,280
Goodwill		143,000		143,000
Investment banking
Goodwill [Roll Forward]
Goodwill		702,700		700,700
Equities and wealth management
Goodwill [Roll Forward]
Goodwill		256,100		255,400
Fixed income
Goodwill [Roll Forward]
Goodwill		578,500		576,900
Other investments
Goodwill [Roll Forward]
Goodwill		$ 161,800		$ 151,900

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