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, 2018	May 31, 2017	May 31, 2018	May 31, 2017
Financial instruments owned:
Loans and other receivables	$ (8,754)	$ (4,282)	$ (6,428)	$ (11,094)
Long-term debt
Financial Instruments Sold and Long-term Debt
Changes in instrument specific credit risk	34,787	(3,757)	18,585	(19,797)
Other changes in fair value	(175)	1,516	40,979	4,933
Short-term borrowings
Financial Instruments Sold and Long-term Debt
Changes in instrument specific credit risk	27	0	27	0
Other changes in fair value	1,636	0	1,636	0
Loans
Financial Instruments Sold and Long-term Debt
Changes in instrument specific credit risk	1	(1,734)	260	(1,761)
Loan commitments
Financial Instruments Sold and Long-term Debt
Changes in instrument specific credit risk	$ 26	$ 3,332	$ (103)	$ 4,203