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CREDIT ARRANGEMENTS (Narrative) (Details)
12 Months Ended
Aug. 31, 2021
USD ($)
Aug. 31, 2021
PLN (zł)
Aug. 31, 2020
USD ($)
Aug. 31, 2019
USD ($)
Aug. 31, 2021
PLN (zł)
May 31, 2021
Aug. 31, 2020
PLN (zł)
Aug. 01, 2020
PLN (zł)
May 31, 2019
USD ($)
Debt Instrument [Line Items]                  
Loss on debt extinguishment $ 16,841,000   $ 1,778,000 $ 0          
Total long-term debt including current maturities 1,077,922,000   1,092,266,000            
Interest costs capitalized 2,800,000   2,500,000 $ 300,000          
Less debt issuance costs 8,141,000   8,581,000            
CMCP                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity 78,300,000   74,600,000   zł 300,000,000   zł 275,000,000    
Revolving line of credit outstanding amount | zł         zł 0   0    
Borrowings under uncommitted lines of credit     22,400,000            
Revolving credit agreement                  
Debt Instrument [Line Items]                  
Revolving credit facility, maximum borrowing capacity 650,000,000                
Revolving line of credit outstanding amount $ 0   0            
Minimum interest coverage ratio 2.50 2.50              
Maximum debt to capitalization ratio 0.60 0.60              
Actual interest coverage ratio 14.61       14.61        
Actual debt to capitalization ratio 0.31       0.31        
Revolving credit agreement | CMCP                  
Debt Instrument [Line Items]                  
Revolving line of credit outstanding amount     22,400,000   zł 0        
Borrowings under uncommitted lines of credit | zł   zł 0              
Stand-by letters of credit                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity $ 50,000,000                
Stand by letters of credit outstanding amount 3,000,000   3,000,000            
Standby Letters of Credit | CMCP                  
Debt Instrument [Line Items]                  
Stand by letters of credit outstanding amount 5,700,000   800,000            
Short-term borrowings                  
Debt Instrument [Line Items]                  
Total long-term debt including current maturities $ 26,560,000   0            
2027 Notes                  
Debt Instrument [Line Items]                  
Weighted average interest rate 5.375%       5.375%        
Total long-term debt including current maturities $ 300,000,000   300,000,000            
2026 Notes                  
Debt Instrument [Line Items]                  
Term loan, maximum principal amount                 $ 350,000,000
Weighted average interest rate 5.75%       5.75% 5.75%      
Loss on debt extinguishment $ 16,800,000                
Total long-term debt including current maturities $ 0   350,000,000            
Less debt issuance costs                 $ 77,800,000
2023 Notes                  
Debt Instrument [Line Items]                  
Weighted average interest rate 4.875%       4.875%        
Total long-term debt including current maturities $ 330,000,000   330,000,000            
Poland Term Loan | CMCP                  
Debt Instrument [Line Items]                  
Term loan, maximum principal amount     13,700,000       50,000,000 zł 250,000,000  
Revolving line of credit outstanding amount     40,700,000       150,000,000    
Total long-term debt including current maturities $ 49,700,000       zł 190,500,000        
Poland Term Loan | Revolving credit agreement                  
Debt Instrument [Line Items]                  
Weighted average interest rate 1.71%       1.71%        
Total long-term debt including current maturities $ 49,726,000   40,713,000            
$300 million notes at 3.875% due February 2031                  
Debt Instrument [Line Items]                  
Weighted average interest rate 3.875%       3.875%        
Total long-term debt including current maturities $ 300,000,000   0            
Less debt issuance costs 4,900,000                
U.S. Program                  
Debt Instrument [Line Items]                  
Transfer of Accounts Receivable Program, Face Amount 150,000,000                
Transfers of Accounts Receivable Outstanding 0   0            
Poland Program                  
Debt Instrument [Line Items]                  
Transfer of Accounts Receivable Program, Face Amount 75,200,000   $ 53,700,000   zł 288,000,000   zł 198,000,000    
Transfers of Accounts Receivable Outstanding $ 26,600,000       zł 101,700,000        
Poland Program | Short-term borrowings                  
Debt Instrument [Line Items]                  
Weighted average interest rate 1.05%       1.05%        
U.S. Program with Consent of CMCRV and Program Administrative Agent                  
Debt Instrument [Line Items]                  
Transfer of Accounts Receivable Program, Face Amount $ 300,000,000                
Credit Agreement Maturing March 2026 | Revolving credit agreement                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity 400,000,000                
Credit Agreement Maturing June 2022 | Revolving credit agreement                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity $ 350,000,000                
PLN 250 Million Amended Credit Facilities Expire in March 2024 | Revolving credit agreement                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity | zł         zł 250,000,000        
PLN 50 Million Amended Credit Facilities Expire in August 2024 | Revolving credit agreement                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity | zł         zł 50,000,000