New Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to net non-current deferred tax assets	$ 4,225	$ 5,311
Decrease to non current deferred tax liabilities	1,223	1,191
New Accounting Pronouncement, Early Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to net non-current deferred tax assets		3,300
Decrease to non current deferred tax liabilities		$ 12,000
Increase in operating activities and decrease from financing activities	$ 100