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Equity Earnings of Unconsolidated Affiliates, Net of Tax and Net Income Attributable to Noncontrolling Interests - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Noncontrolling Interest [Line Items]                  
Percentage of investments in affiliates in which company have non controlling interest             20 percent or more    
Equity earnings of affiliates $ (0.7)           $ 1.3 $ 4.8 $ 3.6
Dividends received from company's equity method affiliates             0.1 0.2 0
Principal balance of loan made to an entity deemed VIE             22.2    
Outstanding amount of loan             17.4    
Net income attributable to noncontrolling interests $ (1.5) $ 0.2 $ (1.1) $ (2.4) $ (0.2) $ (0.2) $ 5.5 $ 2.9 $ 5.7