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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Aug. 31, 2019 | Aug. 31, 2018 | May 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits | $ 38.6 |  | $ 37.3
Effective tax rate | 10.10% | 12.00% |

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