Segment Reporting - Net Revenues, Expenses and Total Assets by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2019	May 31, 2018	Nov. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 901,851	$ 822,557	$ 1,587,569	$ 1,643,803
Non-interest expenses	746,713	700,692	1,369,846	1,399,200
Earnings before income taxes	155,138	121,865	217,723	244,603
Segment assets	42,817,581		42,817,581		$ 41,168,773
Capital Markets
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	859,300	811,300	1,517,500	1,622,000
Non-interest expenses	716,800	687,500	1,319,900	1,370,200
Earnings before income taxes	142,500	123,800	197,600	251,800
Segment assets	39,672,300		39,672,300		38,700,700
Asset Management
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	42,600	11,300	70,100	21,800
Non-interest expenses	30,000	13,200	50,000	29,000
Earnings before income taxes	12,600	$ (1,900)	20,100	$ (7,200)
Segment assets	$ 3,145,300		$ 3,145,300		$ 2,468,100