Investments - Summary of Selected Financial Information for Berkadia (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019	Nov. 30, 2019
Schedule of Equity Method Investments [Line Items]
Net earnings	$ 267,531	$ 64,825	$ 567,792	$ 221,009
Berkadia
Schedule of Equity Method Investments [Line Items]
Our total equity balance	273,200		273,200		$ 268,900
Distributions	0	29,600	36,600	47,700
Berkadia | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Net earnings	$ 41,000	$ 53,800	$ 89,700	$ 160,300