Accumulated Other Comprehensive Income (Loss) (Summary of Accumulated Other Comprehensive Income (Loss), Net of Taxes) (Details) - USD ($) $ in Thousands	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity	$ 9,361,113	$ 9,385,905	$ 9,601,684	$ 9,877,361	$ 9,956,133	$ 10,079,257
Net unrealized gains on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity	574		141
Net unrealized foreign exchange losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity	(227,652)		(192,709)
Net unrealized gains (losses) on instrument specific credit risk
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity	152,845		(18,889)
Net minimum pension liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity	(60,295)		(61,582)
AOCI including portion attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity	$ (134,528)		$ (273,039)