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CREDIT ARRANGEMENTS (Narrative) (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2021
USD ($)
Feb. 28, 2021
USD ($)
Feb. 29, 2020
USD ($)
Feb. 28, 2021
USD ($)
Feb. 29, 2020
USD ($)
Feb. 28, 2021
PLN (zł)
Aug. 31, 2020
USD ($)
Aug. 31, 2020
PLN (zł)
Debt Instrument [Line Items]                
Financial liabilities $ 1,042,617,000 $ 1,042,617,000   $ 1,042,617,000     $ 1,092,266,000  
Less debt issuance costs 8,805,000 8,805,000   8,805,000     8,581,000  
Loss on debt extinguishment   (16,841,000) $ 0 (16,841,000) $ 0      
2026 Notes                
Debt Instrument [Line Items]                
Early Repayment of Senior Debt 77,800,000              
Financial liabilities $ 0 $ 0   $ 0     $ 350,000,000  
Long-term Debt, Weighted Average Interest Rate, at Point in Time 5.75% 5.75%   5.75%   5.75% 5.75% 5.75%
Loss on debt extinguishment   $ 16,800,000   $ 16,800,000        
2031 Notes                
Debt Instrument [Line Items]                
Financial liabilities $ 300,000,000.0 $ 300,000,000.0   $ 300,000,000.0     $ 0  
Long-term Debt, Weighted Average Interest Rate, at Point in Time 3.875% 3.875%   3.875%   3.875%    
Less debt issuance costs $ 4,900,000 $ 4,900,000   $ 4,900,000        
CMCP                
Debt Instrument [Line Items]                
Revolving credit facility current borrowing capacity 73,500,000 73,500,000   73,500,000   zł 275,000,000.0    
CMCP | Poland Term Loan                
Debt Instrument [Line Items]                
Stand by letters of credit outstanding amount 900,000 900,000   900,000     800,000  
Term loan, maximum principal amount 66,800,000 66,800,000   66,800,000   250,000,000.0    
Financial liabilities 40,100,000 40,100,000   40,100,000   zł 150,000,000.0 40,700,000 zł 150,000,000.0
Revolving credit facility                
Debt Instrument [Line Items]                
Revolving credit facility, amount drawn 0 0   0     0  
Revolving credit facility current borrowing capacity 350,000,000.0 350,000,000.0   350,000,000.0        
Revolving credit facility | Poland Term Loan                
Debt Instrument [Line Items]                
Financial liabilities $ 40,068,000 $ 40,068,000   $ 40,068,000     $ 40,713,000  
Long-term Debt, Weighted Average Interest Rate, at Point in Time 1.71% 1.71%   1.71%   1.71%    
Stand-by letters of credit                
Debt Instrument [Line Items]                
Stand by letters of credit outstanding amount $ 3,000,000.0 $ 3,000,000.0   $ 3,000,000.0        
Poland Program                
Debt Instrument [Line Items]                
Transfer of accounts receivable program limit $ 58,800,000 $ 58,800,000   $ 58,800,000   zł 220,000,000.0