Segment Reporting - Net Revenues, Expenses and Total Assets by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2019	Aug. 31, 2018	Nov. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 777,159	$ 777,615	$ 2,364,728	$ 2,421,418
Non-interest expenses	694,084	690,514	2,063,930	2,089,714
Earnings before income taxes	83,075	87,101	300,798	331,704
Segment assets	43,093,588		43,093,588		$ 41,168,773
Capital Markets:
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	757,400	767,000	2,274,900	2,389,000
Non-interest expenses	671,200	678,600	1,991,000	2,048,800
Earnings before income taxes	86,200	88,400	283,900	340,200
Segment assets	39,945,600		39,945,600		38,700,700
Asset Management:
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	19,800	10,600	89,800	32,400
Non-interest expenses	22,900	11,900	72,900	40,900
Earnings before income taxes	(3,100)	$ (1,300)	16,900	$ (8,500)
Segment assets	$ 3,148,000		$ 3,148,000		$ 2,468,100