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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2016 | Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015
Income Tax [Line Items] |  |  |  |
Operating loss carryforwards | $ 2,400 | $ 2,600 | $ 2,400 |
Net deferred tax asset | 200 | 200 | 200 |
Tax credit carryforwards | 2,038 | 2,309 | $ 2,038 |
Undistributed earnings of foreign subsidiaries |  | 137,500 |  |
Deferred tax liability not recognized. Undistributed earnings of foreign subsidiaries that may be repatriated |  | $ 12,900 |  |
Provision for income taxes |  | 29.10% | 27.70% |
Repatriation of foreign earnings | 8,200 |  |  |
Material interest or penalties included in income tax expense |  | $ 0 | $ 0 |
Unrecognized tax benefits | 1,239 | 981 | 1,239 | $ 1,279
Unrecognized tax benefits that would impact the effective tax rate | 900 | 600 | 900 |
Unrecognized tax benefits affected by the resolution of tax examinations or expiring statutes of limitation |  | 400 |  |
Foreign Tax Authority [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Tax credit carryforwards | $ 1,900 | $ 2,100 | $ 1,900 |

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