Goodwill And Other Intangibles (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Goodwill And Other Intangibles [Abstract]
Goodwill	$ 76,734	$ 77,076	$ 77,093
Gross carrying amount of franchise agreements, intellectual property franchise fees and other intangibles	9,200	10,400
Accumulated amortization of intangible assets	5,700	5,900
Amortization of intangible assets	$ 900	$ 900	$ 900
Weighted-average life of amortizable intangible assets	11 years
Estimated intangible assets amortization expense, 2017	$ 900
Estimated intangible assets amortization expense, 2018	300
Estimated intangible assets amortization expense, 2019	300
Estimated intangible assets amortization expense, 2020	300
Estimated intangible assets amortization expense, 2021	$ 200