Revenues from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Feb. 28, 2026	Feb. 28, 2025
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 1,455,649	$ 1,144,426
Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,376,028	1,013,626
Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	79,621	130,800
Americas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,068,172	819,745
Americas \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,042,946	748,675
Americas \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	25,226	71,070
Europe and the Middle East
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	290,819	231,915
Europe and the Middle East \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	237,296	173,121
Europe and the Middle East \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	53,523	58,794
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	96,658	92,766
Asia-Pacific \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	95,786	91,830
Asia-Pacific \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	872	936
Investment banking - Advisory
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	527,128	397,780
Investment banking - Advisory \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	527,128	397,780
Investment banking - Advisory \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
Investment banking - Underwriting
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	487,827	327,881
Investment banking - Underwriting \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	487,827	327,881
Investment banking - Underwriting \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
Equities
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	359,381	286,050
Equities \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	359,381	286,050
Equities \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
Fixed income
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,692	1,915
Fixed income \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,692	1,915
Fixed income \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
Asset management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	6,899	45,808
Asset management \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
Asset management \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	6,899	45,808
Other investments
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	72,722	84,992
Other investments \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0
Other investments \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 72,722	$ 84,992