Segment Reporting - Net Revenues, Expenses and Total Assets by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017	Nov. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 777,615	$ 800,692	$ 2,421,418	$ 2,375,499
Non-interest expenses	690,514	678,428	2,089,714	2,012,855
Earnings before income taxes	87,101	122,264	331,704	362,644
Segment assets	40,572,473		40,572,473		$ 39,705,691
Capital Markets
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	771,100	788,400	2,388,800	2,349,600
Non-interest expenses	678,800	663,400	2,050,400	1,971,900
Earnings before income taxes	92,300	125,000	338,400	377,700
Segment assets	39,532,200		39,532,200		38,620,400
Asset Management
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	6,500	12,300	32,600	25,900
Non-interest expenses	11,700	15,000	39,300	41,000
Earnings before income taxes	(5,200)	$ (2,700)	(6,700)	$ (15,100)
Segment assets	$ 1,040,300		$ 1,040,300		$ 1,085,300