Revenues from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2026	May 31, 2025	May 31, 2026	May 31, 2025
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 1,674,810	$ 1,226,804	$ 3,130,460	$ 2,371,230
Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,595,853	1,129,639	2,971,881	2,143,265
Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	78,957	97,165	158,579	227,965
Americas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,184,064	826,661	2,252,237	1,646,407
Americas \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,161,291	788,139	2,204,238	1,536,814
Americas \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	22,773	38,522	47,999	109,593
Europe and the Middle East
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	332,555	296,223	623,374	528,137
Europe and the Middle East \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	277,424	238,528	514,719	411,649
Europe and the Middle East \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	55,131	57,695	108,655	116,488
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	158,191	103,920	254,849	196,686
Asia-Pacific \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	157,138	102,972	252,924	194,802
Asia-Pacific \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,053	948	1,925	1,884
Investment banking - Advisory
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	674,118	457,725	1,201,246	855,505
Investment banking - Advisory \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	674,118	457,725	1,201,246	855,505
Investment banking - Advisory \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Investment banking - Underwriting
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	530,877	327,730	1,018,704	655,611
Investment banking - Underwriting \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	530,877	327,730	1,018,704	655,611
Investment banking - Underwriting \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Equities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	389,218	342,179	748,599	628,229
Equities \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	389,218	342,179	748,599	628,229
Equities \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Fixed income
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,640	2,005	3,332	3,920
Fixed income \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,640	2,005	3,332	3,920
Fixed income \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Asset management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3,593	7,495	10,492	53,303
Asset management \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Asset management \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3,593	7,495	10,492	53,303
Other investments
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	75,364	89,670	148,087	174,662
Other investments \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Other investments \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 75,364	$ 89,670	$ 148,087	$ 174,662