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Earnings Per Share
 9 Months Ended
Jun. 30, 2011
Earnings Per Share [Abstract]  
EARNINGS PER SHARE
D. EARNINGS PER SHARE
The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data):
                                 
    Three Months Ended     Nine Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
Numerator:
                               
Net income attributable to Powell Industries, Inc.
  $ 1,707     $ 10,286     $ 6,638     $ 29,790  
 
                       
Denominator:
                               
Weighted average basic shares
    11,740       11,556       11,730       11,518  
Dilutive effect of stock options and restricted stock units
    72       123       76       130  
 
                       
Weighted average diluted shares with assumed conversions
    11,812       11,679       11,806       11,648  
 
                       
Net earnings per share:
                               
Basic
  $ 0.15     $ 0.89     $ 0.57     $ 2.59  
 
                       
Diluted
  $ 0.14     $ 0.88     $ 0.56     $ 2.56  
 
                       
All options were included in the computation of diluted earnings per share for the three and nine months ended June 30, 2011 and 2010, respectively, as the options’ exercise prices were less than the average market price of our common stock.