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, 2021	Nov. 30, 2020	Nov. 30, 2019
Financial instruments owned:
Loans and other receivables	$ 11,682	$ (25,623)	$ (2,072)
Loans
Financial instruments sold, not yet purchased, Long-term debt and Short-term borrowings
Changes in instrument specific credit risk	1,077	0	656
Loan commitments
Financial instruments sold, not yet purchased, Long-term debt and Short-term borrowings
Changes in instrument specific credit risk	0	464	(1,089)
Short-term borrowings:
Financial instruments sold, not yet purchased, Long-term debt and Short-term borrowings
Changes in instrument specific credit risk	0	0	114
Other changes in fair value	0	(48)	(863)
Other secured financings
Financial instruments sold, not yet purchased, Long-term debt and Short-term borrowings
Other changes in fair value	650	2,475	0
Long-term debt:
Financial instruments sold, not yet purchased, Long-term debt and Short-term borrowings
Changes in instrument specific credit risk	(113,027)	(70,201)	(20,332)
Other changes in fair value	$ 108,739	$ (84,116)	$ (25,144)