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CREDIT ARRANGEMENTS (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
May 31, 2025
Aug. 31, 2024
Debt Instrument [Line Items]    
Total debt $ 1,354,498 $ 1,198,241
Less debt issuance costs (14,578) (13,073)
Total amounts outstanding 1,344,229 1,189,621
Less current maturities of long-term debt (41,394) (38,786)
Long-term debt $ 1,302,835 1,150,835
2030 Notes    
Debt Instrument [Line Items]    
Weighted average interest rate 4.125%  
Long-term debt, less current maturities $ 300,000 300,000
2031 Notes    
Debt Instrument [Line Items]    
Weighted average interest rate 3.875%  
Long-term debt, less current maturities $ 300,000 300,000
2032 Notes    
Debt Instrument [Line Items]    
Weighted average interest rate 4.375%  
Long-term debt, less current maturities $ 300,000 300,000
Series 2022 Bonds, due 2047    
Debt Instrument [Line Items]    
Weighted average interest rate 4.00%  
Long-term debt, less current maturities $ 145,060 145,060
Plus unamortized bond premium $ 4,309 4,453
Series 2025 Bonds, Due 2032    
Debt Instrument [Line Items]    
Weighted average interest rate 4.625%  
Long-term debt, less current maturities $ 150,000 0
Fixed interest rate 4.625%  
Other    
Debt Instrument [Line Items]    
Weighted average interest rate 5.10%  
Long-term debt, less current maturities $ 10,108 11,910
Finance leases    
Debt Instrument [Line Items]    
Weighted average interest rate 5.207%  
Finance leases $ 149,330 $ 141,271