CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Statement of Comprehensive Income [Abstract]
Currency translation adjustments and other, tax benefits (expenses)		$ (25,600)	$ 8,900	$ (13,700)	$ 10,600
Changes in instrument specific credit risk, tax benefits (expenses)		(45,500)	2,000	13,100	9,000
Changes in instrument specific credit risk reclassified to Principal transactions revenues		600		(900)	500
Changes in instrument specific credit risk reclassified to Principal transactions revenues, tax benefits (expenses)		(200)		300	(200)
Cash flow hedges, tax benefit					200
Cash flow hedges	[1]	$ 0	$ 0	0	(470)
Unrealized gain on available-for-sale securities, tax expense				$ 200	$ 200

[1] The amount during the nine months ended August 31, 2019 includes income tax benefits of $0.2 million. Cash flow hedge losses of $0.5 million were reclassified to Other revenues within the Consolidated Statement of Earnings.