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Goodwill and Other Intangible Assets (Details Textual) $ in Millions | 12 Months Ended
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Apr. 30, 2015 USD ($) ReportingUnits | Apr. 30, 2014 USD ($) | Apr. 30, 2013 USD ($)
Goodwill and Other intangible assets (Textual) [Abstract] |  |  |
Weighted-average useful life of the finite-lived intangible assets | 22 years |  |
Goodwill And Other Intangible Assets (Additional Textual) [Abstract] |  |  |
Amortization expense for finite-lived intangible assets | $ 110.3 | $ 98.7 | $ 96.6
Estimated amortization expense for 2016 | 212.2 |  |
Estimated amortization expense for 2017 | 211.5 |  |
Estimated amortization expense for 2018 | 209.1 |  |
Estimated amortization expense for 2019 | 208.9 |  |
Estimated amortization expense for 2020 | $ 207.4 |  |
Number of reporting units | ReportingUnits | 6 |  |
Customer and Contractual Relationships [Member] |  |  |
Goodwill and Other intangible assets (Textual) [Abstract] |  |  |
Weighted-average useful life of the finite-lived intangible assets | 23 years |  |
Trademarks [Member] |  |  |
Goodwill and Other intangible assets (Textual) [Abstract] |  |  |
Weighted-average useful life of the finite-lived intangible assets | 15 years |  |
Patents And Technology [Member] |  |  |
Goodwill and Other intangible assets (Textual) [Abstract] |  |  |
Weighted-average useful life of the finite-lived intangible assets | 13 years |  |

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- Definition Amortization of intangible assets, excluding intangibles in other current assets. + References No definition available. + Details
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- Definition Goodwill and other intangible assets. + References No definition available. + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reporting Unit -URI http://asc.fasb.org/extlink&oid=6523643 + Details
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