Income Taxes (Details Textual) - USD ($) $ in Millions |
12 Months Ended | ||
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May. 31, 2013 |
May. 31, 2015 |
May. 31, 2014 |
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| Income Taxes (Details Textual) [Abstract] | |||
| Total reserve for uncertain tax positions | $ 29.1 | $ 29.8 | |
| Total reserve for uncertain tax positions included in long-term liabilities | 29.1 | 28.6 | |
| 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 | $ 29.1 | $ 24.6 |
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- Definition Income Taxes (Details Textual) [Abstract] No definition available.
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- Definition Liability for uncertain tax positions current and noncurrent. No definition available.
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- Definition The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The net amount of all increases and decreases in unrecognized tax benefits for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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