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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Nov. 30, 2020 | Aug. 31, 2020 | Nov. 30, 2019
Commitments And Contingencies [Line Items] |  |  |
Liabilities | $ 271,301 | $ 272,008 | $ 253,811
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 |  |
Lindsay, Nebraska Facility [Member] | General and Administrative Expense [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Liabilities |  | $ 1,000 |

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