Investments - Summary of Selected Financial Information for Berkadia (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2020	May 31, 2019	Nov. 30, 2019
Schedule of Equity Method Investments [Line Items]
Net earnings	$ 128,896	$ 109,819	$ 300,261	$ 156,184
Berkadia
Schedule of Equity Method Investments [Line Items]
Our total equity balance	254,800		254,800		$ 268,900
Distributions	400	800	36,600	18,100
Berkadia | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Net earnings	$ 0	$ 56,200	$ 48,700	$ 106,500