Revenues from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 4,858,025	$ 3,233,208	$ 4,742,858
Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	4,386,188	3,074,545	3,733,316
Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	471,837	158,663	1,009,542
Americas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3,419,965	2,502,447	3,915,518
Americas | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3,196,908	2,349,161	2,910,318
Americas | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	223,057	153,286	1,005,200
Europe and the Middle East
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,057,351	488,078	577,607
Europe and the Middle East | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	812,052	485,432	575,012
Europe and the Middle East | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	245,299	2,646	2,595
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	380,709	242,683	249,733
Asia-Pacific | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	377,228	239,952	247,986
Asia-Pacific | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	3,481	2,731	1,747
Investment banking - Advisory
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,811,633	1,198,915	1,778,003
Investment banking - Advisory | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,811,633	1,198,915	1,778,003
Investment banking - Advisory | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0
Investment banking - Underwriting
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,491,030	970,451	1,029,819
Investment banking - Underwriting | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,491,030	970,451	1,029,819
Investment banking - Underwriting | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0
Equities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,074,666	894,602	910,254
Equities | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,074,666	894,602	910,254
Equities | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0
Fixed income
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	8,859	10,577	15,240
Fixed income | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	8,859	10,577	15,240
Fixed income | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0
Asset management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	50,700	33,867	23,525
Asset management | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0
Asset management | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	50,700	33,867	23,525
Other investments
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	421,137	124,796	986,017
Other investments | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0
Other investments | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 421,137	$ 124,796	$ 986,017