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Earnings per Share and Stock-based Compensation - Additional Information (Detail)
$ / shares in Units, € in Millions, $ in Millions
9 Months Ended
Jul. 31, 2015
USD ($)
$ / shares
shares
Jul. 31, 2014
$ / shares
Sep. 08, 2015
EUR (€)
Sep. 08, 2015
USD ($)
Oct. 31, 2014
$ / shares
shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Outstanding options exercisable (shares) 5,093,817        
Outstanding options (shares) 15,037,151       6,817,609
Expected dividend rate 0.00% 0.00%      
Restricted Stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Options granted (shares) 105,000        
Unrecognized compensation expense | $ $ 0.3        
Unrecognized compensation expense, weighted average period 1 year 4 months 11 days        
Vesting period 3 years        
Performance Based Options          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Options granted (shares) 0        
Performance Options          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Outstanding options exercisable (shares) 298,000        
Outstanding options (shares) 516,000       640,000
Unrecognized compensation expense | $ $ 0.1        
Performance Restricted Stock Units          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Weighted average fair value of the restricted stock units (usd per share) | $ / shares $ 1.84 $ 5.16      
Outstanding options exercisable (shares) 0        
Outstanding options (shares) 9,766,428       10,218,508
Unrecognized compensation expense | $ $ 2.7        
Unrecognized compensation expense, weighted average period 1 year        
Non-Performance Based Options          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Weighted average fair value of the restricted stock units (usd per share) | $ / shares $ 0.73       $ 4.18
Options granted (shares) 9,990,000        
Unrecognized compensation expense | $ $ 5.9        
Unrecognized compensation expense, weighted average period 1 year 10 months 21 days        
Fair value assumptions, risk free interest rate 2.00% 2.20%      
Fair value assumptions, expected volatility rate 82.00% 81.00%      
Fair value assumptions, expected life 6 years 7 months 11 days 6 years 8 months      
Weighted average fair value of grants (usd per share) | $ / shares $ 0.64 $ 5.82      
Vesting period 3 years        
2018 Notes - 7.875% Fixed          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Stated interest rate 7.875%        
Subsequent Event | 2018 Notes - 7.875% Fixed          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Value of shares issued in rights offering | $       $ 122.5  
Subsequent Event | Oaktree Capital | 2018 Notes - 7.875% Fixed          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Value of shares issued in rights offering | €     € 50