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Retirement Plans - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
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Aug. 31, 2019 | Aug. 31, 2018
Voluntary Contribution [Member] | U.S. Pensions Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan contributions by employer | $ 1,000 | $ 250

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- Details
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