Revenues from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2026	Aug. 31, 2025	Aug. 31, 2026	Aug. 31, 2025
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 1,751,808	$ 1,504,162	$ 4,882,268	$ 3,875,528
Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,687,411	1,406,091	4,659,292	3,549,492
Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	64,397	98,071	222,976	326,036
Americas
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,335,663	1,078,060	3,587,900	2,724,602
Americas \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,308,726	1,038,469	3,512,963	2,575,418
Americas \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	26,937	39,591	74,937	149,184
Europe and the Middle East
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	269,053	309,927	892,427	838,065
Europe and the Middle East \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	232,627	252,336	747,347	663,986
Europe and the Middle East \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	36,426	57,591	145,080	174,079
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	147,092	116,175	401,941	312,861
Asia-Pacific \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	146,058	115,286	398,982	310,088
Asia-Pacific \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,034	889	2,959	2,773
Investment banking - Advisory
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	817,822	655,578	2,019,068	1,511,218
Investment banking - Advisory \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	817,822	655,578	2,019,068	1,511,218
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	482,621	430,730	1,501,325	1,086,341
Investment banking - Underwriting \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	482,621	430,730	1,501,325	1,086,341
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	385,244	318,319	1,133,843	946,549
Equities \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	385,244	318,319	1,133,843	946,549
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	1,724	1,464	5,056	5,384
Fixed income \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	1,724	1,464	5,056	5,384
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	2,156	8,236	12,648	61,539
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	2,156	8,236	12,648	61,539
Other investments
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	62,241	89,835	210,328	264,497
Other investments \| Investment Banking and Capital Markets
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	0	0	0	0
Other investments \| Asset Management
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	$ 62,241	$ 89,835	$ 210,328	$ 264,497