Investment in Limited Partnership - Reconciliation of Premium/Expenses Reserve Account (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Distributions And Payments Of Premium/Expenses From Reserve Account [Roll Forward]
Beginning balance	$ 22,224		$ 4,195
Collections account	34,188		117,138
Total distribution received	34,200		107,200
Premiums and expenses	30,289	$ 8,210	85,241	$ 8,210
Total payments	30,289		85,241
Balance at August 31, 2020	26,123	21,800	26,123	21,800
Class B Interests
Distributions And Payments Of Premium/Expenses From Reserve Account [Roll Forward]
Premiums and expenses	2,000		6,000
First
Distributions And Payments Of Premium/Expenses From Reserve Account [Roll Forward]
Collections account	34,188		107,169
Total distribution received	56,412		111,364
Premiums and expenses	$ 28,289	$ 8,210	$ 79,241	$ 8,210