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Earnings (Loss) Per Share
 9 Months Ended
Jul. 02, 2011
Earnings Per Share [Abstract]  
Earnings (Loss) Per Share
(11) Earnings (Loss) Per Share
     Effective October 4, 2009, the Company adopted certain provisions of ASC Topic 260, Earnings Per Share, which requires unvested share-based payment awards that contain non-forfeitable rights to dividends (whether paid or unpaid) to be treated as participating securities and included in the computation of basic earnings per share. The Company’s participating securities are its unvested RSAs. Because the Company’s unvested RSAs do not contractually participate in its losses, the Company has not allocated such losses to the unvested RSAs in computing basic earnings per share, using the two-class method, for the nine-month period ended July 2, 2011.
     The computations of basic and diluted earnings (loss) per share attributable to common shareholders for the three- and nine-month periods ended July 2, 2011 and July 3, 2010 are as follows:
                                 
    Three Months Ended     Nine Months Ended  
    July 2,     July 3,     July 2,     July 3,  
(In thousands except per share amounts)   2011     2010     2011     2010  
Earnings (loss) from continuing operations
  $ 3,650     $ 1,624     $ (1,359 )   $ 2,145  
Less allocation to participating securities
    (6 )     (8 )     —       (12 )
 
                       
Available to Insteel common shareholders
  $ 3,644     $ 1,616     $ (1,359 )   $ 2,133  
 
                       
 
                               
Loss from discontinued operations net of income taxes
  $ —     $ (19 )   $ —     $ (42 )
Less allocation to participating securities
    —       —       —       —  
 
                       
Available to Insteel common shareholders
  $ —     $ (19 )   $ —     $ (42 )
 
                       
 
                               
Net earnings (loss)
  $ 3,650     $ 1,605     $ (1,359 )   $ 2,103  
Less allocation to participating securities
    (6 )     (8 )     —       (12 )
 
                       
Available to Insteel common shareholders
  $ 3,644     $ 1,597     $ (1,359 )   $ 2,091  
 
                       
 
                               
Basic weighted average shares outstanding
    17,587       17,492       17,550       17,454  
Dilutive effect of stock-based compensation
    268       203       —       207  
 
                       
Diluted weighted average shares outstanding
    17,855       17,695       17,550       17,661  
 
                       
 
                               
Per share basic:
                               
Earnings (loss) from continuing operations
  $ 0.21     $ 0.09     $ (0.08 )   $ 0.12  
Loss from discontinued operations
    —       —       —       —  
 
                       
Net earnings (loss)
  $ 0.21     $ 0.09     $ (0.08 )   $ 0.12  
 
                       
 
                               
Per share diluted:
                               
Earnings (loss) from continuing operations
  $ 0.20     $ 0.09     $ (0.08 )   $ 0.12  
Loss from discontinued operations
    —       —       —       —  
 
                       
Net earnings (loss)
  $ 0.20     $ 0.09     $ (0.08 )   $ 0.12  
 
                       
     Options and RSUs representing 348,000 and 465,000 shares for the three-month periods ended July 2, 2011 and July 3, 2010, respectively, were antidilutive and were not included in the diluted earnings per share calculation. Options and RSUs representing 496,000 and 486,000 shares for the nine-month periods ended July 2, 2011 and July 3, 2010, respectively, were antidilutive and were not included in the diluted earnings per share calculation. Options, RSAs and RSUs representing 236,000 shares for the nine-month period ended July 2, 2011 were not included in the diluted earnings per share calculation due to the net losses that were incurred.