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Goodwill And Other Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Finite And Indefinite Intangible Assets [Line Items]    
Amortizable intangible assets: weighted average years 10 years 10 years
Total, gross carrying amount $ 53,189 $ 53,274
Amortizable intangible assets: accumulated amortization (21,209) (17,267)
Tradenames [Member]
    
Finite And Indefinite Intangible Assets [Line Items]    
Unamortizable intangible assets: gross carrying amount 13,122 13,126
Patents [Member]
    
Finite And Indefinite Intangible Assets [Line Items]    
Amortizable intangible assets: weighted average years 13 years 12 years 9 months 18 days
Amortizable intangible assets: gross carrying amount 30,282 30,266
Amortizable intangible assets: accumulated amortization (14,687) (12,364)
Customer Relationships [Member]
    
Finite And Indefinite Intangible Assets [Line Items]    
Amortizable intangible assets: weighted average years 7 years 4 months 24 days 7 years 4 months 24 days
Amortizable intangible assets: gross carrying amount 7,932 8,034
Amortizable intangible assets: accumulated amortization (5,304) (4,238)
Non-compete Agreements [Member]
    
Finite And Indefinite Intangible Assets [Line Items]    
Amortizable intangible assets: weighted average years 5 years 7 months 6 days 5 years 7 months 6 days
Amortizable intangible assets: gross carrying amount 1,336 1,331
Amortizable intangible assets: accumulated amortization (852) (611)
Other Intangibles [Member]
    
Finite And Indefinite Intangible Assets [Line Items]    
Amortizable intangible assets: weighted average years 1 year 7 months 6 days 1 year 8 months 12 days
Amortizable intangible assets: gross carrying amount 517 517
Amortizable intangible assets: accumulated amortization $ (366) $ (54)