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Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Sep. 30, 2011
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 34,704 $ 34,595
Accumulated Amortization (21,387) (18,748)
Net Carrying value 13,317 15,847
Supply Agreement [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 17,580 17,580
Accumulated Amortization (7,225) (6,052)
Net Carrying value 10,355 11,528
Purchased Technology [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 11,818 11,747
Accumulated Amortization (9,121) (7,759)
Net Carrying value 2,697 3,988
Non-Compete Agreements [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 4,170 4,170
Accumulated Amortization (4,170) (4,170)
Trade Names [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 1,136 1,098
Accumulated Amortization (871) (767)
Net Carrying value $ 265 $ 331