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Earnings per Share and Stock-based Compensation - Schedule of Changes in Non-Vested Shares under Option, Excluding Performance Based Options (Detail) - Non-Performance Based Options - $ / shares
9 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Shares    
Non-vested, October 31, 2014 (shares) 1,121,336  
Granted (shares) 9,990,000  
Vested (shares) (984,668)  
Canceled (shares) (183,334)  
Non-vested, July 31, 2015 (shares) 9,943,334  
Weighted Average Grant Date Fair Value    
Non-vested, October 31, 2014 (usd per share) $ 4.18  
Granted (usd per share) 0.64 $ 5.82
Vested (usd per share) 2.87  
Canceled (usd per share) 5.20  
Non-vested, July 31, 2015 (usd per share) $ 0.73