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Income Taxes (Narrative) (Details) - USD ($) | 4 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Aug. 31, 2018 | Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015
Income Taxes [Line Items] |  |  |  |  |  |  |
U.S. federal corporate income tax rate | 35.00% | 21.00% |  | 25.70% | 35.00% | 35.00% |
Deferred income tax assets and liabilities resulting from U.S. tax reform |  |  |  | $ 517,000 | $ (688,000) | $ (5,456,000) |
Provisional deemed repatriation tax expense |  |  |  | 1,700,000 |  |  |
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability |  |  |  | 0 |  |  |
Valuation allowance |  | $ 3,562,000 |  | 3,562,000 | 2,804,000 |  |
Unrecognized tax benefits that would impact effective tax rate |  | $ 1,100,000 |  | 1,100,000 | 1,100,000 |  |
Accrued interest and penalties |  |  |  | $ 1,000,000 | $ 800,000 |  |
Maximum [Member] |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Percentage of Recognized largest amount benefit realized upon settlement |  | 50.00% |  | 50.00% |  |  |
Statutes of limitation range period |  |  |  | 5 years |  |  |
Minimum [Member] |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Statutes of limitation range period |  |  |  | 3 years |  |  |
Filtration Business [Member] |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Valuation allowance |  | $ 1,200,000 |  | $ 1,200,000 |  |  |
Capital loss on sale of business |  | 5,100,000 |  | 5,100,000 |  |  |
U.S. [Member] |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Deferred income tax assets and liabilities resulting from U.S. tax reform |  |  |  | 800,000 |  |  |
Certain Foreign Tax Jurisdiction [Member] |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Valuation allowance |  | $ 2,400,000 |  | $ 2,400,000 |  |  | $ 2,900,000
Scenario, Plan [Member] |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
U.S. federal corporate income tax rate |  |  | 21.00% |  |  |  |

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