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CREDIT ARRANGEMENTS (Narrative) (Details)
zł in Millions
 1 Months Ended 12 Months Ended
Feb. 28, 2022
USD ($)
Aug. 31, 2025
USD ($)
Aug. 31, 2024
USD ($)
Aug. 31, 2023
USD ($)
May 31, 2025
USD ($)
Aug. 31, 2024
PLN (zł)
Jan. 31, 2022
USD ($)
Feb. 28, 2021
USD ($)
Debt Instrument [Line Items]                
Total debt   $ 1,364,085,000 $ 1,198,241,000          
Debt issuance costs   14,051,000 13,073,000          
Interest costs capitalized   10,800,000 5,400,000 $ 21,500,000        
CMCP                
Debt Instrument [Line Items]                
Maximum borrowing capacity   164,500,000 154,800,000     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   10.18            
Actual debt to capitalization ratio   0.25            
Stand-by letters of credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 50,000,000.0            
Stand by letters of credit outstanding amount   1,000,000.0 900,000          
Standby Letters of Credit | CMCP                
Debt Instrument [Line Items]                
Stand by letters of credit outstanding amount   $ 2,700,000 2,400,000          
$300 million notes at 4.125% due February 2030                
Debt Instrument [Line Items]                
Total debt             $ 300,000,000  
Weighted average interest rate   4.125%         4.125%  
2032 Notes                
Debt Instrument [Line Items]                
Total debt             $ 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 debt               $ 300,000,000
Weighted average interest rate   3.875%           3.875%
Series 2022 Bonds, due 2047                
Debt Instrument [Line Items]                
Weighted average interest rate 4.00% 4.00%            
Term loan, maximum principal amount $ 145,100,000              
Bonds, effective yield (interest rate) 0.035              
Proceeds from issuance of debt $ 150,000,000              
Series 2025 Bonds, Due 2032                
Debt Instrument [Line Items]                
Weighted average interest rate   4.625%            
Debt issuance costs   $ 2,900,000            
Term loan, maximum principal amount         $ 150,000,000      
Credit Agreement Maturing March 2026 | Revolving credit agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity   600,000,000            
Poland Program                
Debt Instrument [Line Items]                
Transfer of accounts receivable program   $ 78,900,000 $ 74,300,000     zł 288.0