Summary of Significant Accounting Policies (Detail)	9 Months Ended
	Aug. 31, 2016
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]
Useful life of premises and equipment	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life of premises and equipment	10 years