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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
May 31, 2016 | May 31, 2015
Income Tax Contingency [Line Items] |  |
Reserve for uncertain tax positions | $ 54.2 | $ 29.1
Impact of uncertain tax positions, if recognized, on effective income tax rate | $ 54.2 | $ 29.1
Federal [Member] | IRS [Member] | Earliest Tax Year [Member] |  |
Income Tax Contingency [Line Items] |  |
Fiscal year currently under audit | 2012 |
Fiscal years subject to potential audit | 2015 |
Federal [Member] | IRS [Member] | Latest Tax Year [Member] |  |
Income Tax Contingency [Line Items] |  |
Fiscal year currently under audit | 2014 |
Fiscal years subject to potential audit | 2016 |

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