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Trade Accounts and Notes Receivable (Tables)
9 Months Ended
Jun. 30, 2012
Trade Accounts and Notes Receivable [Abstract]  
Current trade accounts
                 
    June 30, 2012     September 30, 2011  

Trade accounts receivable

  $ 24,994     $ 20,172  

Allowance for doubtful accounts

    (668     (411
   

 

 

   

 

 

 
    $ 24,326     $ 19,761  
   

 

 

   

 

 

 
Non-current notes receivable
                 
    June 30, 2012     September 30, 2011  
     

Notes receivable

  $ 3,784     $ 5,806  

Allowance for doubtful notes

    —         —    
   

 

 

   

 

 

 
      3,784       5,806  

Less current portion

    1,588       2,100  
   

 

 

   

 

 

 
     
    $ 2,196     $ 3,706