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Net Income Per Common Share - Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2014
Jul. 31, 2013
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings per share, amount (in shares) 0.2 0.5 0.2 0.9