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Debt - Schedule of Debt (Details) - USD ($)
May 31, 2025
Aug. 31, 2024
Debt Instrument [Line Items]    
Long-Term Note Payable $ 4,750,000 $ 4,750,000
Financing arrangements 278,000 640,000
Obligations under finance leases 501,000 654,000
Less: unamortized debt issuance costs (496,000) (780,000)
Total debt, including obligations under finance leases 521,033,000 508,764,000
Less: current portion (236,060,000) (229,911,000)
Total long-term debt, including obligations under finance leases 284,973,000 278,853,000
Finance lease, liability, current 209,000 199,000
Unamortized debt issuance costs, current 383,000 383,000
Committed Bank Facility    
Debt Instrument [Line Items]    
Amended Revolving Credit Facility 80,000,000 74,000,000
Uncommitted Bank Facilities    
Debt Instrument [Line Items]    
Uncommitted Credit Facilities 216,000,000 209,500,000
Financing Arrangement    
Debt Instrument [Line Items]    
Financing obligations, current 234,000 595,000
Senior Notes, Series B, Due July 28, 2026 | Private Placement Debt    
Debt Instrument [Line Items]    
Debt instrument, face amount $ 100,000,000 100,000,000
Interest rate 2.90%  
Senior Notes Due June 11, 2025 | Private Placement Debt    
Debt Instrument [Line Items]    
Debt instrument, face amount $ 20,000,000 $ 20,000,000
Interest rate 3.79% 3.79%
Senior notes, Due March 5, 2027 | Private Placement Debt    
Debt Instrument [Line Items]    
Debt instrument, face amount $ 50,000,000 $ 50,000,000
Interest rate 2.60%  
Senior Notes Due April 18, 2027 | Private Placement Debt    
Debt Instrument [Line Items]    
Debt instrument, face amount $ 50,000,000 $ 50,000,000
Interest rate 5.73%