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Significant Accounting Policies - Accrued Liabilities (Details) - USD ($)
$ in Thousands
May 31, 2020
May 31, 2019
Accounting Policies [Abstract]    
Insurance reserve $ 165,427 $ 165,667
Employee benefit related liabilities 134,846 123,794
Accrued interest 24,538 24,687
Other 131,842 119,792
Accrued liabilities $ 456,653 $ 433,940