Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Income Taxes [Line Items]
Effective income tax rate	41.10%	36.20%	17.00%
Foreign income tax credit carryforward	$ 2,784	$ 5,106
Operating loss carryforwards	2,700
Income tax benefit from foreign tax credits	600	4,200
Valuation allowance against deferred tax assets	301
Total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate	2,100	2,200
Balance of interest and penalties related to uncertain tax positions	300	300
Reductions for tax positions of prior years resulting from the lapse of applicable statute of limitations	(212)	(339)	$ (663)
Additional Paid-in Capital [Member]
Income Taxes [Line Items]
Reduction of income tax expense in additional paid in capital	$ (52)	$ 137	$ 2,477