Investment in Limited Partnership - Reconciliation of Funds Received And Distributions From Collection Account (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Aug. 31, 2020	Aug. 31, 2020
Funds Received And Distributions Paid From Collection Account [Roll Forward]
Beginning balance	$ 5,643	$ 13,007
Maturity proceeds received - face	32,050	107,276
Proceeds received - other*	272	632
Total receipts	37,965	120,915
Collections account	34,188	117,138
Balance at August 31, 2020	3,777	3,777
First
Funds Received And Distributions Paid From Collection Account [Roll Forward]
Collections account	34,188	107,169
Second \| Class A Interests
Funds Received And Distributions Paid From Collection Account [Roll Forward]
Collections account	$ 0	$ 9,969

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