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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 | Apr. 30, 2013
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Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value | $ (1.5)
Other long-term liabilities [Member] | Interest rate derivatives [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value | (1.3)
Other current assets [Member] | Foreign exchange hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Foreign exchange hedges included in other current assets | 0.3
Other current liabilities [Member] | Foreign exchange hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value | (0.5)
Level 2 [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value | (1.5)
Level 2 [Member] | Other long-term liabilities [Member] | Interest rate derivatives [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value | (1.3)
Level 2 [Member] | Other current assets [Member] | Foreign exchange hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Foreign exchange hedges included in other current assets | 0.3
Level 2 [Member] | Other current liabilities [Member] | Foreign exchange hedges [Member] |
Fair Value Assets Measured On Recurring Basis [Line Items] |
Total Fair Value | $ (0.5)

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- Definition Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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 6: 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=7491637&loc=d3e13495-108611 + Details
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- Definition Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 15 -Paragraph 83 -URI http://asc.fasb.org/extlink&oid=6913464&loc=d3e34841-113949 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 10 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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