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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

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