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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2023 | May 31, 2023 | Aug. 31, 2022
Commitments And Contingencies [Line Items] |  |  |
Liabilities | $ 290,009 |  | $ 317,295
Lindsay, Nebraska Facility [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Current environmental remediation accrual |  | $ 11,500 |
Liabilities | $ 8,100 |  | 11,000
Liabilities discounted risk Free interest rate | 1.20% |  |
Discounted portion of liabilities | $ 9,100 |  | $ 12,400

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