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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 |

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