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
	Feb. 29, 2020	Feb. 28, 2019
Financial instruments owned:
Loans and other receivables	$ 1,739	$ (7,335)
Long-term debt
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	29,432	23,483
Other changes in fair value	(37,642)	(10,643)
Short-term borrowings
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	57	0
Other changes in fair value	12	0
Loans
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	(610)	0
Loan commitments
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	$ (661)	$ 79