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Significant Accounting Policies - Accrued Liabilities (Details) - USD ($)
$ in Thousands
May. 31, 2015
May. 31, 2014
Accounting Policies [Abstract]    
General insurance liabilities $ 113,714 $ 106,083
Employee benefit related liabilities 68,907 64,445
Taxes and related liabilities 6,064 7,531
Accrued interest 26,628 26,726
Other 94,622 94,942
Accrued liabilities $ 309,935 $ 299,727