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Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
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May 31, 2013 | May 31, 2012
Income Taxes (Details Textual) [Abstract] |  |
Total reserve for uncertain tax positions | $ 19.8 | $ 36.8
Total reserve for uncertain tax positions included in long-term liabilities | 19.7 | 35.9
Reserve for uncertain tax positions, increase in May 2013 | 21.2 |
Impact of uncertain tax positions, if recognized, on company's effective income tax rate | $ 14.6 | $ 31.6

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- Definition The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date. + 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 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 6, 7, 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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