Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Income Tax Contingency [Line Items]
State net operating loss carryforwards, valuation allowance	$ 16,300	$ 14,600
Unrecognized tax benefits	643	625	$ 3,652
Unrecognized tax benefits, accrued interest and penalty	400	300
Unrecognized tax benefits, interest and penalties expense (benefit)		$ (100)	$ 100
Possible decrease in unrecognized tax benefits, upper bound	$ 600
Minimum [Member]
Income Tax Contingency [Line Items]
State net operating loss carryforward expiration date	Dec. 01, 2017
Maximum [Member]
Income Tax Contingency [Line Items]
State net operating loss carryforward expiration date	May 31, 2038