Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended			14 Months Ended
	Feb. 28, 2018	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2019
Income Tax Contingency [Line Items]
Statutory federal tax rate		25.70%	35.00%	35.00%
State net operating loss carryforwards, valuation allowance		$ 17,100	$ 16,300
Unrecognized tax benefits		790	643	$ 625
Unrecognized tax benefits, accrued interest and penalty		400	400
Unrecognized tax benefits, interest and penalties expense (benefit)		100	$ 0	$ (100)
Possible decrease in unrecognized tax benefits, upper bound		$ 800
Benefit from deferred tax remeasurement	$ (14,100)
Minimum [Member]
Income Tax Contingency [Line Items]
State net operating loss carryforward expiration date		Dec. 01, 2018
Maximum [Member]
Income Tax Contingency [Line Items]
State net operating loss carryforward expiration date		May 01, 2039
Scenario, Forecast [Member]
Income Tax Contingency [Line Items]
Statutory federal tax rate					21.00%