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Retirement Plans - Schedule of Pension Plans Contributions (Details) - U.S. Plans [Member] - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2018
Feb. 28, 2018
May 31, 2018
May 31, 2017
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan Contributions By Employer $ 1,500 $ 1,500 $ 2,500 $ 2,000
Required Contribution [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan Contributions By Employer     22 459
Voluntary Contribution [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan Contributions By Employer     $ 2,478 $ 1,541