Revenues from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2022	Feb. 28, 2021
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,407,042	$ 1,432,643
Americas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,168,731	1,218,132
Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	166,730	164,435
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	71,581	50,076
Reportable Segments | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,174,501	1,240,550
Reportable Segments | Investment Banking and Capital Markets | Americas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	937,070	1,026,866
Reportable Segments | Investment Banking and Capital Markets | Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	166,172	163,737
Reportable Segments | Investment Banking and Capital Markets | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	71,259	49,947
Reportable Segments | Asset Management
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,569	7,426
Reportable Segments | Asset Management | Americas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,569	7,097
Reportable Segments | Asset Management | Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	329
Reportable Segments | Asset Management | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Reportable Segments | Merchant Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	220,109	184,836
Reportable Segments | Merchant Banking | Americas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	219,229	184,338
Reportable Segments | Merchant Banking | Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	558	369
Reportable Segments | Merchant Banking | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	322	129
Reportable Segments | Corporate
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Reportable Segments | Corporate | Americas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Reportable Segments | Corporate | Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Reportable Segments | Corporate | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Reconciling Items -Consolidation Adjustments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(137)	(169)
Reconciling Items -Consolidation Adjustments | Americas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(137)	(169)
Reconciling Items -Consolidation Adjustments | Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Reconciling Items -Consolidation Adjustments | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Investment Banking - Advisory
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	543,769	311,439
Investment Banking - Advisory | Reportable Segments | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	543,769	311,439
Investment Banking - Advisory | Reportable Segments | Asset Management
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Investment Banking - Advisory | Reportable Segments | Merchant Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Investment Banking - Advisory | Reportable Segments | Corporate
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Investment Banking - Advisory | Reconciling Items -Consolidation Adjustments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Investment Banking - Underwriting
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	401,279	692,173
Investment Banking - Underwriting | Reportable Segments | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	401,279	692,173
Investment Banking - Underwriting | Reportable Segments | Asset Management
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Investment Banking - Underwriting | Reportable Segments | Merchant Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Investment Banking - Underwriting | Reportable Segments | Corporate
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Investment Banking - Underwriting | Reconciling Items -Consolidation Adjustments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Equities
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	225,931	233,370
Equities | Reportable Segments | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	226,068	233,539
Equities | Reportable Segments | Asset Management
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Equities | Reportable Segments | Merchant Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Equities | Reportable Segments | Corporate
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Equities | Reconciling Items -Consolidation Adjustments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	(137)	(169)
Fixed Income
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,385	3,399
Fixed Income | Reportable Segments | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,385	3,399
Fixed Income | Reportable Segments | Asset Management
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Fixed Income | Reportable Segments | Merchant Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Fixed Income | Reportable Segments | Corporate
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Fixed Income | Reconciling Items -Consolidation Adjustments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Asset Management
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,569	7,426
Asset Management | Reportable Segments | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Asset Management | Reportable Segments | Asset Management
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,569	7,426
Asset Management | Reportable Segments | Merchant Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Asset Management | Reportable Segments | Corporate
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Asset Management | Reconciling Items -Consolidation Adjustments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Manufacturing revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	141,108	137,847
Manufacturing revenues | Reportable Segments | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Manufacturing revenues | Reportable Segments | Asset Management
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Manufacturing revenues | Reportable Segments | Merchant Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	141,108	137,847
Manufacturing revenues | Reportable Segments | Corporate
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Manufacturing revenues | Reconciling Items -Consolidation Adjustments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Oil and gas revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	57,919	32,009
Oil and gas revenues | Reportable Segments | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Oil and gas revenues | Reportable Segments | Asset Management
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Oil and gas revenues | Reportable Segments | Merchant Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	57,919	32,009
Oil and gas revenues | Reportable Segments | Corporate
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Oil and gas revenues | Reconciling Items -Consolidation Adjustments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	21,082	14,980
Other revenues | Reportable Segments | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Other revenues | Reportable Segments | Asset Management
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Other revenues | Reportable Segments | Merchant Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	21,082	14,980
Other revenues | Reportable Segments | Corporate
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Other revenues | Reconciling Items -Consolidation Adjustments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	$ 0