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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, 2018
Aug. 31, 2018
Jul. 31, 2017
May 31, 2013
Debt Instrument [Line Items]        
Total debt $ 1,348,366 $ 1,170,129    
Less debt issuance costs 11,459 11,764    
Total amounts outstanding 1,336,907 1,158,365    
Less current maturities 29,083 19,746    
Long-term debt $ 1,307,824 1,138,619    
2027 Notes        
Debt Instrument [Line Items]        
Weighted average interest rate 5.375%   5.375%  
Total debt $ 300,000 300,000    
2026 Notes        
Debt Instrument [Line Items]        
Weighted average interest rate 5.75%      
Total debt $ 350,000 350,000    
2023 Notes        
Debt Instrument [Line Items]        
Weighted average interest rate 4.875%     4.875%
Total debt $ 330,000 330,000    
Other, including equipment notes        
Debt Instrument [Line Items]        
Total debt $ 49,991 47,629    
Revolving credit facility | Term Loans        
Debt Instrument [Line Items]        
Weighted average interest rate 3.81%      
Total debt $ 318,375 142,500    
U.S. Program        
Debt Instrument [Line Items]        
Advances outstanding under transfer of receivables programs 0      
Poland Program        
Debt Instrument [Line Items]        
Advances outstanding under transfer of receivables programs $ 0 $ 12,147