Goodwill And Other Intangible Assets (Schedule Of Intangible Assets Finite and Infinite Excluding Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Finite And Indefinite Intangible Assets [Line Items]
Amortizable intangible assets: weighted average years	5 years 1 month 6 days	5 years 8 months 12 days
Total, gross carrying amount	$ 76,698	$ 76,387
Amortizable intangible assets: accumulated amortization	(33,890)	(29,187)
Tradenames [Member]
Finite And Indefinite Intangible Assets [Line Items]
Unamortizable intangible assets: gross carrying amount	$ 20,121	$ 20,114
Patents and Developed Technology [Member]
Finite And Indefinite Intangible Assets [Line Items]
Amortizable intangible assets: weighted average years	5 years 1 month 6 days	6 years 1 month 6 days
Amortizable intangible assets: gross carrying amount	$ 34,038	$ 33,732
Amortizable intangible assets: accumulated amortization	$ (21,581)	$ (18,893)
Customer Relationships [Member]
Finite And Indefinite Intangible Assets [Line Items]
Amortizable intangible assets: weighted average years	5 years 9 months 18 days	6 years
Amortizable intangible assets: gross carrying amount	$ 19,975	$ 19,952
Amortizable intangible assets: accumulated amortization	$ (10,419)	$ (8,747)
Non-compete Agreements [Member]
Finite And Indefinite Intangible Assets [Line Items]
Amortizable intangible assets: weighted average years	1 year 7 months 6 days	2 years 2 months 12 days
Amortizable intangible assets: gross carrying amount	$ 2,354	$ 2,350
Amortizable intangible assets: accumulated amortization	$ (1,806)	$ (1,450)
Other Intangible Assets [Member]
Finite And Indefinite Intangible Assets [Line Items]
Amortizable intangible assets: weighted average years	8 years 9 months 18 days	9 years 6 months
Amortizable intangible assets: gross carrying amount	$ 210	$ 239
Amortizable intangible assets: accumulated amortization	$ (84)	$ (97)