Quarterly report pursuant to Section 13 or 15(d)

Income per Common Share - Additional Information (Detail)

v2.4.0.8
Income per Common Share - Additional Information (Detail) (Employee Stock Incentive Plan [Member])
3 Months Ended 9 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2014
Aug. 31, 2013
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 262,500 588,000 288,500 511,000