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Debt and Financing Arrangements (Tables) | 12 Months Ended
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Apr. 30, 2015
Debt and Financing Arrangements [Abstract] |
Long-term debt |
|  | April 30, 2015 |  |  | April 30, 2014 |
|  | Principal Outstanding |  |  | Carrying Amount |  |  | Principal Outstanding |  |  | Carrying Amount |
4.78% Senior Notes due June 1, 2014 |  | $ | — |  |  | $ | — |  |  | $ | 100.0 |  |  | $ | 100.0 |
6.12% Senior Notes due November 1, 2015 |  |  | — |  |  |  | — |  |  |  | 24.0 |  |  |  | 24.0 |
6.63% Senior Notes due November 1, 2018 |  |  | — |  |  |  | — |  |  |  | 376.0 |  |  |  | 391.4 |
3.50% Senior Notes due October 15, 2021 |  |  | 750.0 |  |  |  | 796.0 |  |  |  | 750.0 |  |  |  | 758.8 |
5.55% Senior Notes due April 1, 2022 |  |  | — |  |  |  | — |  |  |  | 300.0 |  |  |  | 299.2 |
4.50% Senior Notes due June 1, 2025 |  |  | — |  |  |  | — |  |  |  | 400.0 |  |  |  | 399.7 |
1.75% Senior Notes due March 15, 2018 |  |  | 500.0 |  |  |  | 496.9 |  |  |  | — |  |  |  | — |
2.50% Senior Notes due March 15, 2020 |  |  | 500.0 |  |  |  | 494.3 |  |  |  | — |  |  |  | — |
3.00% Senior Notes due March 15, 2022 |  |  | 400.0 |  |  |  | 395.3 |  |  |  | — |  |  |  | — |
3.50% Senior Notes due March 15, 2025 |  |  | 1,000.0 |  |  |  | 991.9 |  |  |  | — |  |  |  | — |
4.25% Senior Notes due March 15, 2035 |  |  | 650.0 |  |  |  | 641.8 |  |  |  | — |  |  |  | — |
4.38% Senior Notes due March 15, 2045 |  |  | 600.0 |  |  |  | 583.8 |  |  |  | — |  |  |  | — |
Term Loan Credit Agreement due March 23, 2020 |  |  | 1,550.0 |  |  |  | 1,544.9 |  |  |  | — |  |  |  | — |
Total long-term debt |  | $ | 5,950.0 |  |  | $ | 5,944.9 |  |  | $ | 1,950.0 |  |  | $ | 1,973.1 |
Current portion of long-term debt |  |  | — |  |  |  | — |  |  |  | 100.0 |  |  |  | 100.0 |
Total long-term debt, less current portion |  | $ | 5,950.0 |  |  | $ | 5,944.9 |  |  | $ | 1,850.0 |  |  | $ | 1,873.1 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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