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Income per Common Share - Additional Information (Detail) - shares
3 Months Ended 6 Months Ended
May 31, 2016
May 31, 2016
Employee Stock Incentive Plan [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Number of outstanding options excluded from computation of diluted earnings per share 40,000 40,000