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Income Taxes and Other Taxes (Details) $ in Millions | 3 Months Ended
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Aug. 31, 2017 USD ($)
Income Tax And Non Income Tax Disclosure [Abstract] |
Annualized effective income tax rate (percentage) | 39.60%
Effective income tax rate (percentage) | 37.30%
Wisconsin | State Sales Tax Assessment [Member] |
Loss Contingencies [Line Items] |
Sales payable | $ 5.4

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