Revenues from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2022	Aug. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 939,906	$ 1,397,922	$ 2,986,352	$ 3,871,093
Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	936,148	1,395,069	2,966,725	3,859,012
Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3,758	2,853	19,627	12,081
Americas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	685,087	1,117,738	2,321,830	3,115,805
Americas | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	681,329	1,114,885	2,302,203	3,104,357
Americas | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3,758	2,853	19,627	11,448
Europe
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	191,806	215,146	464,370	576,407
Europe | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	191,806	215,146	464,370	575,774
Europe | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	633
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	63,013	65,038	200,152	178,881
Asia Pacific | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	63,013	65,038	200,152	178,881
Asia Pacific | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Investment banking - Advisory
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	486,762	583,887	1,402,291	1,285,834
Investment banking - Advisory | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	486,762	583,887	1,402,291	1,285,834
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	227,915	596,789	858,649	1,899,204
Investment banking - Underwriting | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	227,915	596,789	858,649	1,899,204
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	218,007	210,109	695,508	663,503
Equities | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	218,007	210,109	695,508	663,503
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	3,464	4,284	10,277	10,471
Fixed income | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3,464	4,284	10,277	10,471
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	3,758	2,853	19,627	12,081
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	$ 3,758	$ 2,853	$ 19,627	$ 12,081