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Significant Accounting Policies - Accrued Liabilities (Details) - USD ($)
$ in Thousands
May 31, 2017
May 31, 2016
Accounting Policies [Abstract]    
General insurance liabilities $ 153,743 $ 128,759
Employee benefit related liabilities 110,104 75,587
Taxes and related liabilities 8,057 5,765
Accrued interest 36,638 26,682
Other 121,267 106,473
Accrued liabilities $ 429,809 $ 343,266