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Temporary Differences and Carryforwards of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Aug. 31, 2021 | Aug. 31, 2020
--- | --- | ---
Deferred income tax assets: |  |
Deferred Tax Assets Operating Loss And Tax Credit Carryforwards | $ 77,691 | $ 99,905
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits | 6,110 | 5,941
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits | 8,364 | 9,068
Deferred Tax Assets, Inventory | 3,177 | 1,793
Deferred Tax Assets, Lease Liabilities | 11,609 | 10,526
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other | 11,471 | 6,752
Total deferred income tax assets | 118,422 | 133,985
Valuation allowance | (66,155) | (70,414)
Net deferred income tax assets | 52,267 | 63,571
Deferred income tax liabilities: |  |
Depreciation and amortization | (29,444) | (31,457)
Deferred Tax Liabilities Lease Assets | (11,609) | (10,526)
Other items | (781) | (702)
Deferred income tax liabilities | (41,834) | (42,685)
Net deferred income tax liability | (10,433) | (20,886)
Income Tax Disclosure Additional Details [Table] [Line Items] |  |
Deferred Tax Liabilities, Other | 781 | 702
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 7,800 |
Deferred Tax Assets, Tax Credit Carryforwards | 2,400 |
Deferred Tax Assets, Tax Credit Carryforwards, Other |  | 3,400
Other Noncurrent Assets [Member] |  |
Deferred income tax liabilities: |  |
Deferred Income Tax Assets, Net | 14,800 | 22,600
Deferred income taxes [Member] |  |
Deferred income tax liabilities: |  |
Deferred Income Tax Liabilities, Net | $ 4,400 | $ 1,700

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