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Valuation and Qualifying Accounts (Tables)
12 Months Ended
Sep. 30, 2012
Valuation and Qualifying Accounts  
Schedule of changes in valuation and qualifying accounts

 

 
  Balance at
Beginning
of Period
  Charges
(credits) to
Expense
  Deductions(1)   Balance at
End of
Period
 

Allowance for doubtful accounts receivables:

                         

September 30, 2012

  $ 1,129   $ 235   $ (115 ) $ 1,249  

September 30, 2011

    1,116     54     (41 )   1,129  

September 30, 2010

    1,310     263     (457 )   1,116  

September 30, 2009

    1,354     470     (514 )   1,310  

September 30, 2008

    1,339     100     (85 )   1,354  

(1)
Uncollectible accounts written off net of recoveries.