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, 2018	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017
Financial instruments owned:
Loans and other receivables	$ 14,002	$ 24,846	$ 7,495	$ 27,715
Long-term debt
Financial Instruments Sold and Long-term Debt
Changes in instrument specific credit risk	1,401	5,638	19,986	(14,141)
Other changes in fair value	(6,842)	(1,854)	33,626	2,786
Short-term borrowings
Financial Instruments Sold and Long-term Debt
Changes in instrument specific credit risk	0	19	0	1
Other changes in fair value	0	(2,570)	0	(37)
Loans
Financial Instruments Sold and Long-term Debt
Changes in instrument specific credit risk	(2,708)	3,436	(2,467)	(7,286)
Loan commitments
Financial Instruments Sold and Long-term Debt
Changes in instrument specific credit risk	$ (1,695)	$ 82	$ (1,964)	$ 229