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CREDIT ARRANGEMENTS (Narrative) (Details)
zł in Millions
 1 Months Ended 12 Months Ended
Feb. 28, 2022
USD ($)
Aug. 31, 2024
USD ($)
Aug. 31, 2023
USD ($)
Aug. 31, 2022
USD ($)
Aug. 31, 2023
PLN (zł)
Jan. 31, 2022
USD ($)
Feb. 28, 2021
USD ($)
Debt Instrument [Line Items]              
Total long-term debt including current maturities   $ 1,198,241,000 $ 1,164,991,000        
Less debt issuance costs   13,073,000 14,840,000     $ 9,400,000  
Interest costs capitalized   5,400,000 21,500,000 $ 11,900,000      
CMCP              
Debt Instrument [Line Items]              
Maximum borrowing capacity   154,800,000 145,400,000   zł 600.0    
Revolving credit agreement              
Debt Instrument [Line Items]              
Revolving credit facility, maximum borrowing capacity   850,000,000.0          
Revolving line of credit outstanding amount   $ 0 0        
Minimum interest coverage ratio   2.50          
Maximum debt to capitalization ratio   0.60          
Actual interest coverage ratio   20.37          
Actual debt to capitalization ratio   0.22          
Stand-by letters of credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 50,000,000.0          
Stand by letters of credit outstanding amount   900,000          
Standby Letters of Credit | CMCP              
Debt Instrument [Line Items]              
Stand by letters of credit outstanding amount   2,400,000 16,300,000        
$300 million notes at 4.125% due February 2030              
Debt Instrument [Line Items]              
Total long-term debt including current maturities   $ 300,000,000 300,000,000     $ 300,000,000  
Weighted average interest rate   4.125%       4.125%  
2032 Notes              
Debt Instrument [Line Items]              
Total long-term debt including current maturities   $ 300,000,000 300,000,000     $ 300,000,000  
Weighted average interest rate   4.375%       4.375%  
$300 million notes at 3.875% due February 2031              
Debt Instrument [Line Items]              
Total long-term debt including current maturities   $ 300,000,000 300,000,000       $ 300,000,000
Weighted average interest rate   3.875%         3.875%
2026 Notes              
Debt Instrument [Line Items]              
Total long-term debt including current maturities             $ 350,000,000
Weighted average interest rate             5.75%
Series 2022 Bonds, due 2047              
Debt Instrument [Line Items]              
Total long-term debt including current maturities   $ 145,060,000 145,060,000        
Weighted average interest rate 4.00% 4.00%          
Less debt issuance costs $ 3,100,000            
Term loan, maximum principal amount $ 145,100,000            
Bonds, effective yield (interest rate) 0.035            
Proceeds from issuance of debt $ 150,000,000            
Credit Agreement Maturing March 2026 | Revolving credit agreement              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 600,000,000.0          
Delayed Draw Senior Secured Term Loan Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity   200,000,000          
Poland Program              
Debt Instrument [Line Items]              
Transfer of Accounts Receivable Program, Face Amount   $ 74,300,000 69,800,000   288.0    
Transfers of Accounts Receivable Outstanding     $ 8,400,000   zł 34.7