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CREDIT ARRANGEMENTS (Narrative) (Details)
PLN in Millions
1 Months Ended 12 Months Ended
Jun. 26, 2014
USD ($)
Feb. 29, 2016
USD ($)
May 31, 2013
USD ($)
Aug. 31, 2008
USD ($)
Jul. 31, 2007
USD ($)
Aug. 31, 2016
USD ($)
Aug. 31, 2015
USD ($)
Aug. 31, 2014
USD ($)
Aug. 31, 2012
USD ($)
Aug. 31, 2016
PLN
Aug. 31, 2016
USD ($)
Aug. 31, 2015
PLN
Aug. 31, 2015
USD ($)
Debt Instrument [Line Items]                          
Loss on debt extinguishment           $ 11,480,000 $ 0 $ 0          
Net proceeds from termination of interest rate swaps                 $ 52,700,000        
Deferred gain of interest rate swaps                     $ 11,600,000   $ 19,200,000
Amortization of interest rate swaps termination gain           7,597,000 7,597,000 7,597,000          
Interest costs capitalized           3,600,000              
Interest paid           74,700,000 86,700,000 $ 85,600,000          
CMCP                          
Debt Instrument [Line Items]                          
Revolving credit facility current borrowing capacity                   PLN 175.0 44,800,000 PLN 215.0 56,900,000
Revolving line of credit outstanding amount                     0    
Annual total borrowing           $ 0 49,600,000            
Annual total payments             $ 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                     500,000,000    
Minimum interest coverage ratio           2.5              
Maximum debt to capitalization ratio           0.60              
Minimum liquidity required                     $ 150,000,000    
Actual interest coverage ratio                   5.00 5.00    
Actual debt to capitalization ratio                   0.44 0.44    
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   $ 23,400,000
$330 million notes at 4.875% due May 2023                          
Debt Instrument [Line Items]                          
Debt instrument, issuance date     May 20, 2013                    
Debt instrument, face amount     $ 330,000,000                    
Debt instrument, interest rate, stated percentage     4.875%                    
$500 million notes at 7.35% due August 2018                          
Debt Instrument [Line Items]                          
Debt instrument, issuance date       Aug. 04, 2008                  
Debt instrument, face amount       $ 500,000,000                  
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 6.50% due July 2017                          
Debt Instrument [Line Items]                          
Debt instrument, issuance date         Jul. 17, 2007                
Debt instrument, face amount         $ 400,000,000                
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