Deconsolidation of Subsidiaries - Fair Value of Investment in Lamington (Details) - USD ($) $ in Thousands		3 Months Ended
		Feb. 29, 2020	Feb. 28, 2019
Investment in Deconsolidated Subsidiary [Roll Forward]
Investment in Lamington at December 1, 2018	[1]	$ 137,849
Change in fair value of investment in deconsolidated subsidiaries		0	$ 33,965
Investment in Lamington at February 28, 2019		143,201
Lamington
Investment in Deconsolidated Subsidiary [Roll Forward]
Investment in Lamington at December 1, 2018		128,800	128,795
Increase in basis investment			711
Change in fair value of investment in deconsolidated subsidiaries			33,965
Investment in Lamington at February 28, 2019		$ 95,500	$ 95,541

[1] Derived from audited consolidated financial statements.