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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Aug. 31, 2021 | Aug. 31, 2020
Commitments And Contingencies [Line Items] |  |
Liabilities | $ 298,740 | $ 272,008
Lindsay, Nebraska Facility [Member] |  |
Commitments And Contingencies [Line Items] |  |
Current environmental remediation accrual | 16,100 |
Liabilities | $ 11,000 | $ 11,000
Liabilities discounted risk Free interest rate | 1.20% |
Discounted portion of liabilities | $ 12,400 |
Lindsay, Nebraska Facility [Member] | General and Administrative Expense [Member] |  |
Commitments And Contingencies [Line Items] |  |
Liabilities | $ 1,000 |

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