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Financial Instruments and Fair Value Measurements - Recurring Fair Value Measurements (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified | Jul. 31, 2013
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Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value | $ (1.2)
Other Long-Term Liabilities [Member] | Interest Rate Derivatives [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value | (1.0)
Prepaid Expenses and Other Current Assets [Member] | Foreign Exchange Hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Foreign exchange hedges included in prepaid expenses and other current assets | 0.5
Other Current Liabilities [Member] | Foreign Exchange Hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value | (0.7)
Other Current Liabilities [Member] | Energy Hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value |
Level 1 [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value |
Level 1 [Member] | Other Long-Term Liabilities [Member] | Interest Rate Derivatives [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value |
Level 1 [Member] | Prepaid Expenses and Other Current Assets [Member] | Foreign Exchange Hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Foreign exchange hedges included in prepaid expenses and other current assets |
Level 1 [Member] | Other Current Liabilities [Member] | Foreign Exchange Hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value |
Level 1 [Member] | Other Current Liabilities [Member] | Energy Hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value |
Level 2 [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value | (1.2)
Level 2 [Member] | Other Long-Term Liabilities [Member] | Interest Rate Derivatives [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value | (1.0)
Level 2 [Member] | Prepaid Expenses and Other Current Assets [Member] | Foreign Exchange Hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Foreign exchange hedges included in prepaid expenses and other current assets | 0.5
Level 2 [Member] | Other Current Liabilities [Member] | Foreign Exchange Hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value | (0.7)
Level 2 [Member] | Other Current Liabilities [Member] | Energy Hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value |
Level 3 [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value |
Level 3 [Member] | Other Long-Term Liabilities [Member] | Interest Rate Derivatives [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value |
Level 3 [Member] | Prepaid Expenses and Other Current Assets [Member] | Foreign Exchange Hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Foreign exchange hedges included in prepaid expenses and other current assets |
Level 3 [Member] | Other Current Liabilities [Member] | Foreign Exchange Hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value |
Level 3 [Member] | Other Current Liabilities [Member] | Energy Hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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