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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2016
Sep. 30, 2015
Current assets:    
Allowance, accounts receivable $ 2,798 $ 3,841
Stockholders' equity:    
Preferred stock, par value $ 0.003 $ 0.003
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.001455 $ 0.001455
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 72,960,000 72,960,000
Treasury stock, shares 11,501,000 9,763,000
Treasury stock held for deferred compensation, shares 157,000 173,000