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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 | 6 Months Ended
--- | --- | ---
Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2013 | Apr. 30, 2012
Noncontrolling Interest [Line Items] |  |  |  |
Equity earnings of affiliates | $ 0.2 | $ 2.0 | $ 0.3 | $ 2.0
Principal balance of loan made to an entity deemed VIE | 22.2 |  | 22.2 |
Outstanding amount of loan | 16.3 |  | 16.3 |
Net income attributable to noncontrolling interests | $ (2.1) | $ 0.2 | $ (3.4) | $ (0.9)
Minimum [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Percentage of investments in affiliates in which Company have noncontrolling interest |  |  | 20.00% |
Number of affiliates in which Company has equity interest |  |  | 6 |

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