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Comprehensive Income (Tables)
12 Months Ended
Oct. 02, 2011
Comprehensive Income. 
Schedule of components of comprehensive income, net of related tax
  Fiscal Year-Ended  
 
   October 2,
2011 		  October 3,
2010 		  September 27,
2009 		 
 
   (in thousands)
  
  
    
    
    
  

Net income including noncontrolling interests

   $ 92,982   $ 76,819   $ 87,028  

Other comprehensive income:

                    
 

Foreign currency translation adjustment

     (13,955 )   6,874     12,211  
 

Foreign currency hedge

     438     (337 )   –  
               
   

Comprehensive income including noncontrolling interests

     79,465     83,356     99,239  
 

Net income attributable to noncontrolling interests

     (2,943 )   –     –  
 

Foreign currency translation adjustment

     (492 )   –     –  
               
   

Comprehensive income attributable to noncontrolling interests

     (3,435 )   –     –  
               
   

Comprehensive income attributable to Tetra Tech

   $ 76,030   $ 83,356   $ 99,239