Segment Reporting - Net Revenues, Expenses and Total Assets by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2020	May 31, 2019	Nov. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 1,034,367	$ 901,851	$ 2,205,063	$ 1,587,569
Non-interest expenses	861,499	746,713	1,796,817	1,369,846
Earnings before income taxes	172,868	155,138	408,246	217,723
Segment assets	45,084,417		45,084,417		$ 43,516,115
Investment Banking and Capital Markets:
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	1,028,900	859,300	2,177,700	1,517,500
Non-interest expenses	814,300	716,800	1,713,300	1,319,900
Earnings before income taxes	214,600	142,500	464,400	197,600
Segment assets	42,152,500		42,152,500		40,565,800
Asset Management:
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	5,500	42,600	27,400	70,100
Non-interest expenses	47,200	30,000	83,600	50,000
Earnings before income taxes	(41,700)	$ 12,600	(56,200)	$ 20,100
Segment assets	$ 2,931,900		$ 2,931,900		$ 2,950,300