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Retirement Plans - Additional Information (Details) - U.S. Pension Plans [Member] - Voluntary Contribution [Member] - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Sep. 14, 2018 | Aug. 31, 2018 | Aug. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan contributions by employer |  | $ 250 | $ 250
Subsequent Event [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan contributions by employer | $ 250 |  |

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