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CREDIT ARRANGEMENTS (Narrative) (Details)
PLN in Millions
1 Months Ended 12 Months Ended
Jun. 26, 2014
USD ($)
Feb. 29, 2016
USD ($)
Aug. 31, 2008
USD ($)
Jul. 31, 2007
USD ($)
Aug. 31, 2017
USD ($)
Aug. 31, 2016
USD ($)
Aug. 31, 2015
USD ($)
Aug. 31, 2012
USD ($)
Aug. 31, 2017
PLN
Aug. 31, 2017
USD ($)
Aug. 31, 2016
PLN
Aug. 31, 2016
USD ($)
May 31, 2013
USD ($)
Debt Instrument [Line Items]                          
Loss on debt extinguishment         $ 22,672,000 $ 11,480,000 $ 0            
Net proceeds from termination of interest rate swaps               $ 52,700,000          
Deferred interest rate swaps termination gain                   $ 0   $ 11,600,000  
Amortization of interest rate swaps termination gain         11,657,000 7,597,000 7,597,000            
Interest costs capitalized         9,800,000 3,600,000              
Interest paid         65,700,000 74,700,000 86,700,000            
CMCP                          
Debt Instrument [Line Items]                          
Revolving credit facility current borrowing capacity                 PLN 175.0 49,100,000 PLN 175.0 44,800,000  
Revolving line of credit outstanding amount                   0      
Annual total borrowing         $ 0 $ 0              
Line of Credit Facility, Annual Principal Payment             $ 49,600,000            
Revolving credit agreement                          
Debt Instrument [Line Items]                          
Debt instrument, issuance date Jun. 26, 2014                        
Revolving credit facility current borrowing capacity $ 350,000,000                        
Revolving credit facility, maturity date Jun. 26, 2019                        
Revolving credit facility, maximum borrowing capacity                   $ 750,000,000      
Minimum interest coverage ratio         2.5                
Maximum debt to capitalization ratio         0.60                
Actual interest coverage ratio                 5.29 5.29      
Actual debt to capitalization ratio                 0.37 0.37      
Stand-by letters of credit                          
Debt Instrument [Line Items]                          
Revolving credit facility current borrowing capacity                   $ 50,000,000      
Stand by letters of credit outstanding amount                   3,000,000      
Term loan | Revolving credit agreement                          
Debt Instrument [Line Items]                          
Revolving credit facility, maximum borrowing capacity                   $ 150,000,000   0  
Quarterly payments, as percent of original principal amount (percent)         1.25%                
Weighted average interest rate                 2.8035% 2.8035%      
$300 Million notes at 5.375% due July 2027                          
Debt Instrument [Line Items]                          
Debt instrument, face amount                   $ 300,000,000   $ 0  
Weighted average interest rate                 5.375% 5.375%      
$330 million notes at 4.875% due May 2023                          
Debt Instrument [Line Items]                          
Debt instrument, face amount                         $ 330,000,000
Weighted average interest rate                 4.875% 4.875%      
Debt instrument, interest rate, stated percentage                         4.875%
$500 million notes at 6.40% due August 2018                          
Debt Instrument [Line Items]                          
Debt instrument, issuance date     Aug. 04, 2008                    
Debt instrument, face amount     $ 500,000,000                    
Weighted average interest rate                 6.40% 6.40%      
Debt instrument, interest rate, stated percentage     7.35%                    
Debt instrument, maturity date     Aug. 15, 2018                    
Loss on debt extinguishment         $ (6,100,000)                
Effective interest rate     6.40%                    
Extinguishment of Debt, Amount   $ 100,200,000                      
$400 million notes at 6.40% due July 2017                          
Debt Instrument [Line Items]                          
Debt instrument, issuance date       Jul. 17, 2007                  
Debt instrument, face amount       $ 400,000,000                  
Weighted average interest rate                 5.74% 5.74%      
Debt instrument, interest rate, stated percentage       6.50%                  
Debt instrument, maturity date       Jul. 15, 2017                  
Loss on debt extinguishment         $ (5,400,000)                
Effective interest rate       5.74%                  
Extinguishment of Debt, Amount   $ 100,000,000