Revenues from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	$ 5,276,691	$ 3,333,939	$ 2,222,257
Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	5,262,367	3,324,752	2,205,038
Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	14,324	9,187	17,219
Americas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	4,263,999	2,746,537	1,762,040
Americas | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	4,250,294	2,742,298	1,751,568
Americas | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	13,705	4,239	10,472
Europe
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	767,365	406,801	381,158
Europe | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	766,746	401,853	374,411
Europe | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	619	4,948	6,747
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	245,327	180,601	79,059
Asia Pacific | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	245,327	180,601	79,059
Asia Pacific | Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	0	0	0
Investment banking - Advisory
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	1,873,560	1,053,500	767,421
Investment banking - Advisory | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	1,873,560	1,053,500	767,421
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:	2,492,495	1,447,994	761,308
Investment banking - Underwriting | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	2,492,495	1,447,994	761,308
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:	881,957	807,350	662,804
Equities | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	881,957	807,350	662,804
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:	14,355	15,908	13,505
Fixed income | Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers:	14,355	15,908	13,505
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:	14,324	9,187	17,219
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:	$ 14,324	$ 9,187	$ 17,219