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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2013 | Jan. 31, 2013 | Apr. 30, 2012
Income Taxes [Abstract] |  |  |
Increase (decrease) in unrecognized tax benefits | $ (33.3) | $ (59.0) |
Unrecognized tax benefits | 146.6 | 146.6 | 206.4
Unrecognized tax benefit from interest adjustment | 10.0 | 10.0 |
Unrecognized tax benefits after adjustments | 43.3 | 43.3 |
Gross unrecognized tax benefit decrease |  | 59.8 |
Possible decrease of previously unrecognized tax benefits |  | $ 18 |

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- Definition The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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