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Accounts and Notes Receivable (Tables)
12 Months Ended
Sep. 30, 2012
Accounts and Notes Receivable [Abstract]  
Current trade accounts receivable
                 
    AS OF
SEPTEMBER 30,
 
    2012     2011  

Trade accounts receivable

  $ 16,509     $ 20,172  

Allowance for doubtful accounts

    (280     (411
   

 

 

   

 

 

 
    $ 16,229     $ 19,761  
   

 

 

   

 

 

 
Notes receivable
                 
    September 30,
2012
    September 30,
2011
 

Notes receivable

  $ 5,493     $ 5,806  

Allowance for doubtful notes

    —         —    
   

 

 

   

 

 

 
      5,493       5,806  

Less current portion

    3,806       2,100  
   

 

 

   

 

 

 
    $ 1,687     $ 3,706