Revenues from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2024	Aug. 31, 2023	Aug. 31, 2024	Aug. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 1,222,645	$ 844,959	$ 3,229,408	$ 2,373,368
Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,195,818	823,902	3,129,781	2,267,757
Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	26,827	21,057	99,627	105,611
Americas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	910,235	668,280	2,444,756	1,846,435
Americas | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	885,377	648,511	2,351,130	1,744,439
Americas | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	24,858	19,769	93,626	101,996
Europe and the Middle East
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	224,610	101,050	522,108	340,355
Europe and the Middle East | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	223,570	100,419	518,916	338,551
Europe and the Middle East | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,040	631	3,192	1,804
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	87,800	75,629	262,544	186,578
Asia-Pacific | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	86,871	74,972	259,735	184,767
Asia-Pacific | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	929	657	2,809	1,811
Investment banking - Advisory
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	592,462	335,271	1,214,927	886,606
Investment banking - Advisory | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	592,462	335,271	1,214,927	886,606
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	333,173	264,919	1,128,356	708,857
Investment banking - Underwriting | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	333,173	264,919	1,128,356	708,857
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	267,697	221,191	779,462	663,957
Equities | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	267,697	221,191	779,462	663,957
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	2,486	2,521	7,036	8,337
Fixed income | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	2,486	2,521	7,036	8,337
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	7,189	5,344	43,539	27,965
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	7,189	5,344	43,539	27,965
Other investments
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	19,638	15,713	56,088	77,646
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	$ 19,638	$ 15,713	$ 56,088	$ 77,646