Goodwill And Other Intangible Assets (Schedule Of Intangible Assets Finite and Infinite Excluding Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
Finite And Indefinite Intangible Assets [Line Items]
Amortizable intangible assets: weighted average years	3 years 8 months 12 days	5 years 1 month 6 days
Total, gross carrying amount	$ 56,834	$ 76,698
Amortizable intangible assets: accumulated amortization	(29,457)	(33,890)
Tradenames [Member]
Finite And Indefinite Intangible Assets [Line Items]
Unamortizable intangible assets: gross carrying amount	$ 12,297	$ 20,121
Patents and Developed Technology [Member]
Finite And Indefinite Intangible Assets [Line Items]
Amortizable intangible assets: weighted average years	3 years 2 months 12 days	5 years 1 month 6 days
Amortizable intangible assets: gross carrying amount	$ 26,831	$ 34,038
Amortizable intangible assets: accumulated amortization	$ (19,656)	$ (21,581)
Customer Relationships [Member]
Finite And Indefinite Intangible Assets [Line Items]
Amortizable intangible assets: weighted average years	5 years 2 months 12 days	5 years 9 months 18 days
Amortizable intangible assets: gross carrying amount	$ 16,459	$ 19,975
Amortizable intangible assets: accumulated amortization	$ (8,668)	$ (10,419)
Non-compete Agreements [Member]
Finite And Indefinite Intangible Assets [Line Items]
Amortizable intangible assets: weighted average years	4 months 24 days	1 year 7 months 6 days
Amortizable intangible assets: gross carrying amount	$ 1,137	$ 2,354
Amortizable intangible assets: accumulated amortization	$ (1,048)	$ (1,806)
Other Intangible Assets [Member]
Finite And Indefinite Intangible Assets [Line Items]
Amortizable intangible assets: weighted average years	1 year 1 month 6 days	8 years 9 months 18 days
Amortizable intangible assets: gross carrying amount	$ 110	$ 210
Amortizable intangible assets: accumulated amortization	$ (85)	$ (84)