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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017	Aug. 31, 2018
Income Taxes [Line Items]
Income tax expense	$ 3,941	$ 2,624	$ 5,548	$ 3,086
Estimated effective income tax rate			53.00%	34.40%
Provisional deemed repatriation transition tax obligation			$ 1,800
Deferred income tax expense resulting from U.S. tax reform	800
Provisional estimates incremental income tax expense resulting from U.S. tax reform	$ 2,600
Tax adjustment for unusual items		$ 0		$ 0
Scenario, Plan [Member]
Income Taxes [Line Items]
Blended U.S. corporate income tax rate					25.70%

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Income taxes.

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Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

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