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Income Taxes (Details Textuals) (USD $) In Millions | 12 Months Ended
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May 31, 2011 | May 31, 2010
Income Taxes (Textuals) [Abstract] |  |
Total reserve for uncertain tax positions | $ 34.4 | $ 27.5
Impact of uncertain tax position in company's effective income tax rate | 29.2 |
Total reserve for uncertain tax positions which included in long-term liabilities on the consolidated balance sheets | $ 34.1 | $ 27.4

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- Definition Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 15, 21 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(1) -Article 7 + Details
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