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Income Taxes and Other Taxes (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2017 USD ($) | Feb. 28, 2017 USD ($)
Income Tax And Non Income Tax Disclosure [Abstract] |  |
Annualized effective income tax rate (percentage) |  | 38.80%
Effective income tax rate (percentage) | 35.10% | 45.60%
Wisconsin | State Sales Tax Assessment [Member] |  |
Loss Contingencies [Line Items] |  |
Sales payable | $ 5.4 | $ 5.4

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