Fair Value Disclosures - Summary of Gains (Losses) Due to Changes in Instrument Specific Credit Risk for Loans and Other Receivables and Loan Commitments Measured at Fair Value under Fair Value Option (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2020	May 31, 2019
Financial instruments owned:
Loans and other receivables	$ (13,926)	$ (2,352)	$ (10,830)	$ (3,072)
Long-term debt
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	197,737	4,009	227,169	27,492
Other changes in fair value	(30,982)	(36,665)	(68,624)	(47,308)
Short-term borrowings
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	35	0	91	0
Other changes in fair value	(644)	0	(881)	0
Loans
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	127	0	127	0
Loan commitments
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	$ 1,750	$ (757)	$ 1,089	$ (678)