Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Income Taxes [Abstract]
Valuation allowance	$ 2,804	$ 2,825	$ 2,900
Undistributed earnings of foreign subsidiaries	43,900
Unrecognized tax benefits that would impact effective tax rate	1,500	1,300
Accrued interest and penalties	$ 800	$ 800