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Comprehensive Income
9 Months Ended
Jun. 30, 2011
Comprehensive Income [Abstract]  
Comprehensive Income
7. Comprehensive Income
     The calculation of the Company’s comprehensive income for the three and nine months ended June 30, 2011 and 2010 is as follows (in thousands):
                                 
    Three months ended     Nine months ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
Net income
  $ 66,189     $ 16,646     $ 116,278     $ 34,717  
Change in cumulative translation adjustment
    1,972       (2,020 )     4,562       (1,384 )
Unrealized gain (loss) on marketable securities
    67       (6 )     (159 )     (194 )
Actuarial loss
    (1 )           (48 )      
 
                       
Comprehensive income
    68,227       14,620       120,633       33,139  
Add: Comprehensive loss (income) attributable to noncontrolling interests
    (6 )     (74 )     (24 )     89  
 
                       
Comprehensive income attributable to Brooks Automation, Inc.
  $ 68,221     $ 14,546     $ 120,609     $ 33,228