Investments - Epic Gas (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	May 31, 2019	Dec. 31, 2018	Aug. 31, 2020	Aug. 31, 2019	Feb. 28, 2019
Schedule of Equity Method Investments [Line Items]
Net earnings	$ 267,531	$ 64,825			$ 567,792	$ 221,009
Epic Gas
Schedule of Equity Method Investments [Line Items]
Ownership percentage							21.10%
Proceeds from sale			$ 24,600
Gain from sale						$ 2,800
Investment							$ 22,100
Epic Gas | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Net earnings				$ 900