Accumulated Other Comprehensive Income (Loss) (Summary of Accumulated Other Comprehensive Income (Loss), Net of Taxes) (Details) - USD ($) $ in Thousands	Aug. 31, 2020	May 31, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Nov. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity	$ 9,444,451	$ 9,361,113	$ 9,601,684	$ 10,047,781	$ 9,877,361	$ 10,079,257
Net unrealized gains on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity	552		141
Net unrealized foreign exchange losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity	(156,894)		(192,709)
Net unrealized gains (losses) on instrument specific credit risk
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity	19,586		(18,889)
Net minimum pension liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity	(59,651)		(61,582)
AOCI including portion attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity	$ (196,407)		$ (273,039)