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Valuation and Qualifying Accounts
12 Months Ended
Sep. 30, 2011
Valuation and Qualifying Accounts [Abstract] 
VALUATION AND QUALIFYING ACCOUNTS
VALUATION AND QUALIFYING ACCOUNTS
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
DIGI INTERNATIONAL INC.
(in thousands)
                                 
            Increase                
    Balance at     (Decrease) to             Balance at  
    beginning     costs and             end of  
Description   of period     expenses     Deductions     period  
 
   
Valuation account — doubtful accounts
                               
September 30, 2011
  $ 549     $ (96 )   $ 114 (1)   $ 339  
September 30, 2010
  $ 624     $ 132     $ 207 (1)   $ 549  
September 30, 2009
  $ 697     $ (1 )   $ 72 (1)   $ 624  
 
   
Reserve for future returns and pricing adjustments
                               
September 30, 2011
  $ 1,106     $ 5,156     $ 4,982     $ 1,280  
September 30, 2010
  $ 1,058     $ 4,916     $ 4,868     $ 1,106  
September 30, 2009
  $ 1,369     $ 3,756     $ 4,067     $ 1,058  
(1)   Uncollectible accounts charged against allowance, net of recoveries