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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 23, 2017 | Dec. 22, 2017 | Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018
Income Taxes [Line Items] |  |  |  |  |  |
Income tax expense (benefit) |  |  | $ (7,548) | $ 10,231 | $ 1,615 |
Effective income tax benefit rate |  |  | 124.20% |  |  |
Effective tax rate |  |  | 21.00% | 21.00% | 21.00% |
Additional tax expense from increase in valuation allowance against deferred income tax assets |  |  | $ 11,300 | $ 11,300 |  |
GILTI tax expense |  |  | 0 | 0 | $ 300 |
GILTI tax benefit |  |  | 300 |  |  |
Operating loss carryforwards |  |  | 14,242 |  |  |
Reduced the valuation allowance by |  |  | 10,546 | (11,261) | (418) |
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate |  |  | 1,300 | 1,300 |  |
Unrecognized tax benefits |  |  | 1,594 | 1,640 | 1,895 | $ 2,111
Balance of interest and penalties related to uncertain tax positions |  |  | 200 | 200 |  |
Tax Act 2017 [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Income tax expense (benefit) |  |  |  | 200 | 100 |
Effective tax rate | 21.00% | 35.00% |  |  |  |
Stock-Based Compensation Deductions [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Income tax expense (benefit) |  |  | (500) | $ (1,800) | $ 100 |
United States – State And Local Income Tax [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | 1,600 |  |  |
Foreign Tax Authority [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | $ 800 |  |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations attributable to deduction. Includes, but is not limited to, dividend deduction, deduction for dividend paid to employee stock ownership plan (ESOP), Medicare prescription drug benefit subsidy deduction, and other deductions. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 + Details
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