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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2022
Aug. 31, 2022
Nov. 30, 2021
Commitments And Contingencies [Line Items]      
Liabilities $ 303,508 $ 317,295 $ 307,502
Lindsay, Nebraska Facility [Member]      
Commitments And Contingencies [Line Items]      
Current environmental remediation accrual 13,600    
Liabilities $ 11,000    
Liabilities discounted risk Free interest rate 1.20%    
Discounted portion of liabilities $ 12,400