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	12 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2017
Financial instruments owned:
Loans and other receivables	$ (2,072)	$ (3,856)	$ 22,088
Loans
Financial instruments sold, not yet purchased, Long-term debt and Short-term borrowings
Changes in instrument specific credit risk	656	(46)	0
Loan commitments
Financial instruments sold, not yet purchased, Long-term debt and Short-term borrowings
Changes in instrument specific credit risk	(1,089)	(739)	230
Long-term debt
Financial instruments sold, not yet purchased, Long-term debt and Short-term borrowings
Changes in instrument specific credit risk	(20,332)	38,064	(34,609)
Other changes in fair value	(25,144)	48,748	47,291
Short-term borrowings
Financial instruments sold, not yet purchased, Long-term debt and Short-term borrowings
Changes in instrument specific credit risk	114	0	0
Other changes in fair value	$ (863)	$ 0	$ (681)