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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Feb. 28, 2023 | Aug. 31, 2022 | Feb. 28, 2022
Commitments And Contingencies [Line Items] |  |  |
Liabilities | $ 286,808 | $ 317,295 | $ 320,046
Lindsay, Nebraska Facility [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Current environmental remediation accrual | $ 13,100 |  |
Liabilities discounted risk Free interest rate | 1.20% |  |
Discounted portion of liabilities | $ 11,400 |  |

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