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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2021 | Aug. 31, 2020
Income Taxes [Line Items] |  |
Valuation allowance | $ 1,091 | $ 3,218
Unrecognized tax benefits that would impact effective tax rate | 500 | 800
Accrued interest and penalties | $ 800 | 1,100
Maximum [Member] |  |
Income Taxes [Line Items] |  |
Percentage of Recognized largest amount benefit realized upon settlement | 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 | $ 800 | 1,200
Certain Foreign Tax Jurisdiction [Member] |  |
Income Taxes [Line Items] |  |
Valuation allowance | 0 | $ 1,700
Valuation allowance reserve in prior year | $ 1,700 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition Amount of expense for penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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