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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Sep. 30, 2011
Jun. 30, 2011
Financial assets that are measured at fair value on a recurring basis      
Marketable equity securities $ 4,520 $ 5,366 $ 5,422
Level 1 [Member]
     
Financial assets that are measured at fair value on a recurring basis      
Marketable equity securities 4,520 5,366 5,422
Level 2 [Member]
     
Financial assets that are measured at fair value on a recurring basis      
Marketable equity securities 0 0 0
Level 3 [Member]
     
Financial assets that are measured at fair value on a recurring basis      
Marketable equity securities $ 0 $ 0 $ 0