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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, 2013
Aug. 31, 2012
Finite And Indefinite Intangible Assets [Line Items]    
Amortizable intangible assets: weighted average years 10 years  
Total, gross carrying amount $ 53,274 $ 39,573
Amortizable intangible assets: accumulated amortization (17,267) (14,503)
Tradenames [Member]
    
Finite And Indefinite Intangible Assets [Line Items]    
Unamortizable intangible assets: gross carrying amount 13,126 6,575
Patents [Member]
    
Finite And Indefinite Intangible Assets [Line Items]    
Amortizable intangible assets: weighted average years 12 years 9 months 18 days 12 years 8 months 12 days
Amortizable intangible assets: gross carrying amount 30,266 25,637
Amortizable intangible assets: accumulated amortization (12,364) (10,458)
Customer Relationships [Member]
    
Finite And Indefinite Intangible Assets [Line Items]    
Amortizable intangible assets: weighted average years 7 years 4 months 24 days 8 years 4 months 24 days
Amortizable intangible assets: gross carrying amount 8,034 6,313
Amortizable intangible assets: accumulated amortization (4,238) (3,477)
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 6 months
Amortizable intangible assets: gross carrying amount 1,331 846
Amortizable intangible assets: accumulated amortization (611) (478)
Other Intangibles [Member]
    
Finite And Indefinite Intangible Assets [Line Items]    
Amortizable intangible assets: weighted average years 1 year 8 months 12 days 10 years
Amortizable intangible assets: gross carrying amount 517 202
Amortizable intangible assets: accumulated amortization $ (54) $ (90)