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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
May 31, 2022 | Aug. 31, 2021 | May 31, 2021
Commitments And Contingencies [Line Items] |  |  |
Liabilities | $ 331,146 | $ 298,740 | $ 306,044
Lindsay, Nebraska Facility [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Current environmental remediation accrual | 16,100 |  |
Liabilities | $ 11,000 |  |
Liabilities discounted risk Free interest rate | 1.20% |  |
Discounted portion of liabilities | $ 12,400 |  |

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