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Comprehensive Income
9 Months Ended
Jun. 30, 2011
Comprehensive Income [Abstract]  
COMPREHENSIVE INCOME
G. COMPREHENSIVE INCOME  
Comprehensive income was as follows (in thousands):
                                 
    Three Months Ended     Nine Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
Net income attributable to Powell Industries, Inc.
  $ 1,707     $ 10,286     $ 6,638     $ 29,790  
Unrealized gain (loss) on foreign currency translation, net of tax
    (559 )     (159 )     1,514       (77 )
Unrealized loss on derivative contracts, net of tax
    (9 )     (7 )     (13 )     (203 )
 
                       
Comprehensive income
  $ 1,139     $ 10,120     $ 8,139     $ 29,510