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Income Taxes and Other Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2018 | Feb. 28, 2017 | Feb. 28, 2018 | Feb. 28, 2017
Income Tax And Non Income Tax Disclosure [Abstract] |  |  |  |
Annualized effective income tax rate (percentage) |  |  | 33.90% |
Effective income tax rate (percentage) | 22.30% |  | 23.80% |
Income tax expense due to remeasurement of deferred tax balances |  | $ 8.3 |  | $ 0.0
Wisconsin | State Sales Tax Assessment [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Sales payable | $ 5.4 |  | $ 5.4 |

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