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Earnings per Share
9 Months Ended
Jun. 30, 2011
Earnings per Share [Abstract]  
Earnings per Share
6. Earnings per Share
     Below is a reconciliation of weighted average common shares outstanding for purposes of calculating basic and diluted earnings per share (in thousands):
                                 
    Three months ended   Nine months ended
    June 30,   June 30,
    2011   2010   2011   2010
Weighted average common shares outstanding used in computing basic earnings per share
    64,668       63,969       64,481       63,679  
Dilutive common stock options and restricted stock awards
    473       295       460       444  
 
                               
Weighted average common shares outstanding for purposes of computing diluted earnings per share
    65,141       64,264       64,941       64,123  
 
                               
     Approximately 358,000 and 784,000 options to purchase common stock and 38,000 and 257,000 shares of restricted stock were excluded from the computation of diluted earnings per share attributable to common stockholders for the three months ended June 30, 2011 and 2010, respectively, as their effect would be anti-dilutive. In addition, approximately 399,000 and 934,000 options to purchase common stock and 340,000 and 123,000 shares of restricted stock were excluded from the computation of diluted earnings per share attributable to common stockholders for the nine months ended June 30, 2011 and 2010, respectively, as their effect would be anti-dilutive.