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Basis of Presentation - Additional Information (Details) $ in Millions | 3 Months Ended
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Aug. 31, 2017 USD ($)
Accounting Policies [Abstract] |
Income tax deficiency recognized | $ 0.2

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- Definition Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Deficiency, Amount + References No definition available. + Details
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- References No definition available. + Details
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