Impairment Of Long-Lived Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
Impaired Long-Lived Assets Held and Used [Line Items]
Provisions for impairment of long-lived assets	$ 1,440	$ 114	$ 1,776
Change in vendor for the Sonic system's new point-of-sale technology [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Provisions for impairment of long-lived assets			1,600
Surplus Property [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Provisions for impairment of long-lived assets			$ 200