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, 2021	May 31, 2020	May 31, 2021	May 31, 2020
Financial instruments owned:
Loans and other receivables	$ 15,520	$ (13,926)	$ 23,259	$ (10,830)
Short-term borrowings
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	0	35	0	91
Other changes in fair value	0	(644)	0	(881)
Long-term debt
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	(32,247)	197,737	(122,898)	227,169
Other changes in fair value	6,846	(30,982)	86,113	(68,624)
Loans
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	(363)	127	(363)	127
Loan commitments
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	$ 0	$ 1,750	$ 0	$ 1,089