Fair Value Disclosures - Summary of Amount by Which Contractual Principal Exceeds Fair Value for Loans and Other Receivables Measured at Fair Value under Fair Value Option (Details) - USD ($) $ in Thousands	Aug. 31, 2020	Nov. 30, 2019
Financial instruments owned:
Loans and other receivables	$ 1,839,249	$ 1,546,516
Loans and other receivables on nonaccrual status and/or 90 days or greater past due	334,504	197,215
Long-term debt and short-term borrowings	74,197	74,408
Loans and other receivables 90 days or greater past due	29,000	22,200
Other secured financings	$ 923	$ 0