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		9 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Financial instruments owned:
Loans and other receivables	$ 24,846	$ (24,874)	$ 27,715	$ (48,658)
Long-term debt
Financial Instruments Sold and Long-term Debt
Gains (losses) due to changes in instrument specific credit risk	5,638	(4,093)	(14,141)	(7,848)
Other changes in fair value	(1,854)	4,474	2,786	15,225
Short-term borrowing
Financial Instruments Sold and Long-term Debt
Gains (losses) due to changes in instrument specific credit risk	19	0	1	0
Other changes in fair value	(2,570)	0	(37)	0
Loans
Financial Instruments Sold and Long-term Debt
Gains (losses) due to changes in instrument specific credit risk	3,436	212	(7,286)	229
Loan commitments
Financial Instruments Sold and Long-term Debt
Gains (losses) due to changes in instrument specific credit risk	$ 82	$ 4,769	$ 229	$ 2,196