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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Nov. 30, 2014	Feb. 28, 2014	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Finite Lived Intangible Assets [Line Items]
Goodwill			$ 95,649	$ 96,409	$ 95,499
Impairment of goodwill			0
Impairment charges			0	0	0
Estimated fair value			19,191	22,961	$ 23,671
Carrying value of definite-lived intangible assets			36,009	$ 37,805
GT 85 Limited [Member]
Finite Lived Intangible Assets [Line Items]
Purchase consideration	$ 4,100
Cash paid	3,700
Goodwill	1,300
Customer-Related [Member] \| GT 85 Limited [Member]
Finite Lived Intangible Assets [Line Items]
Purchase consideration	$ 1,700
Estimated useful life	8 years
Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Estimated fair value			17,457
Trade Names [Member] \| GT 85 Limited [Member]
Finite Lived Intangible Assets [Line Items]
Purchase consideration	$ 900
Estimated useful life	10 years
Technology [Member]
Finite Lived Intangible Assets [Line Items]
Estimated fair value			67
Technology [Member] \| GT 85 Limited [Member]
Finite Lived Intangible Assets [Line Items]
Purchase consideration	$ 200
Estimated useful life	4 years
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Estimated fair value			$ 1,667
Customer Relationships [Member] \| Establissments Decloedt [Member]
Finite Lived Intangible Assets [Line Items]
Cash paid		$ 1,800
Estimated useful life		5 years