Summary of Significant Accounting Policies (Detail)	3 Months Ended
	Feb. 28, 2017
Property, Plant and Equipment [Line Items]
More than percentage of tax benefit realized upon ultimate settlement with taxing authority	50.00%
Minimum [Member]
Property, Plant and Equipment [Line Items]
Hedging relationship effective percentage	80.00%
Useful life of premises and equipment	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Hedging relationship effective percentage	125.00%
Useful life of premises and equipment	10 years