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 (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2019	May 31, 2018
Financial instruments owned:
Loans and other receivables	$ (2,352)	$ (8,754)	$ (3,072)	$ (6,428)
Long-term debt
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	4,009	34,787	27,492	18,585
Other changes in fair value	(36,665)	(175)	(47,308)	40,979
Short-term borrowings
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	0	27	0	27
Other changes in fair value	0	1,636	0	1,636
Loans
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	0	1	0	260
Loan commitments
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	$ (757)	$ 26	$ (678)	$ (103)