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CREDIT ARRANGEMENTS (Long-term Debt, Including the Deferred Gain from the Termination of the Interest Rate Swaps) (Details) - USD ($)
$ in Thousands
Nov. 30, 2016
Aug. 31, 2016
Debt Instrument [Line Items]    
Total debt $ 1,072,013 $ 1,075,641
Less debt issuance costs 3,960 4,224
Total amounts outstanding 1,068,053 1,071,417
Less current maturities 312,892 313,469
Long-term debt $ 755,161 757,948
2023 Notes    
Debt Instrument [Line Items]    
Weighted average interest rate 4.875%  
Total debt $ 330,000 330,000
2018 Notes    
Debt Instrument [Line Items]    
Weighted average interest rate 6.4047%  
Total debt $ 407,718 408,874
2017 Notes    
Debt Instrument [Line Items]    
Weighted average interest rate 5.7359%  
Total debt $ 301,858 302,601
Other, including equipment notes    
Debt Instrument [Line Items]    
Total debt $ 32,437 $ 34,166