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Income Taxes (Details 3) (USD $) In Millions | 12 Months Ended
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May 31, 2011 | May 31, 2010 | May 31, 2009
Gross unrecognized tax benefits, not including interest or potential offsetting effects |  |  |
Balance as of beginning of fiscal year | $ 35.8 | $ 35.8 | $ 25.7
Additions for tax positions of the current year | 6.0 | 0.5 | 10.7
Additions for tax positions of the prior years | 0.1 |  | (0.2)
Reductions for tax positions of prior years | (0.1) |  |
Settlements with tax authorities |  |  | (0.1)
Expiration of the statute of limitations | (0.6) | (0.5) | (0.3)
Balance as of end of fiscal year | $ 41.2 | $ 35.8 | $ 35.8

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- Definition The gross amount of unrecognized tax benefits (tax reductions recognized in financial reports but excluded from tax returns) pertaining to uncertain tax positions taken in tax returns as of the beginning balance sheet date, excluding amounts pertaining to examined tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a + Details
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- Definition The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(1) + Details
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- Definition The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(3) + Details
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- Definition The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(2) + Details
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