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Financial Instruments and Fair Value Measurements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2013
Apr. 30, 2013
Jan. 31, 2013
Jul. 31, 2012
Jul. 31, 2013
Jul. 31, 2012
Oct. 31, 2012
Oct. 31, 2011
Debt Instrument [Line Items]                
Approximate reclassification of net loss from accumulated other comprehensive income         $ 0.5      
Interest rate swap agreements maturity year 2014       2014      
Weighted average of variable interest rate 0.19%       0.19%   0.21%  
Weighted average of fixed interest rate 0.75%       0.75%   0.75%  
Realized losses on interest rate derivatives related to statement of operations 0.2     0.2 0.6 0.8    
Other comprehensive losses on interest rate derivatives         0.2 0.2    
(Gains) losses recorded under fair value contracts 1.5     2.8 1.1 4.5    
Gains reclassified to earnings for hedging contracts qualifying as cash flow hedges 48.8 42.3 24.9 39.0 116.0 99.0 127.9 177.6
Loss on foreign currency forward contracts related to other comprehensive income           0.7    
Realized losses on Energy hedges related to statement of operations       0.4   1.0    
Carrying amount of long-term debt 1,250.8       1,250.8   1,200.3  
Restructuring-related expenses on long lived assets         2.8 5.4    
Net book value of long lived assets 2.8     19.6 2.8 19.6    
Recognized amount of impairment related to assets under contract to be sold         1.8      
Recognized amount of impairment related to net assets held for sale         0   2.0  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
                
Debt Instrument [Line Items]                
Gains reclassified to earnings for hedging contracts qualifying as cash flow hedges       0.1   (0.1)    
Interest Rate Derivatives [Member]
                
Debt Instrument [Line Items]                
Notional amount 150.0       150.0      
Foreign Currency Forward Contracts [Member]
                
Debt Instrument [Line Items]                
Notional amount 150.9       150.9   233.2  
Senior Notes [Member]
                
Debt Instrument [Line Items]                
Estimated fair value long-term debt 331.5       331.5   330.8  
Carrying amount of long-term debt 301.9       301.9   302.3  
Senior Notes Due 2019 [Member]
                
Debt Instrument [Line Items]                
Estimated fair value long-term debt 288.1       288.1   286.9  
Carrying amount of long-term debt 244.2       244.2   243.6  
Senior Notes Due 2021 [Member]
                
Debt Instrument [Line Items]                
Estimated fair value long-term debt 299.9       299.9   283.4  
Carrying amount of long-term debt $ 262.9       $ 262.9   $ 256.0