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Business Segment Information (Tables)
3 Months Ended
Dec. 31, 2011
Business Segment Information [Abstract]  
Financial information by reportable segment
Financial information by reportable segment for the three-month fiscal periods ended December 31, 2011 and January 1, 2011 was as follows:

   
Three Fiscal Months Ended
 
   
December 31,
  
January 1,
 
   
2011
  
2011
 
   
(expressed in thousands)
 
Revenue by Segment:
      
Test
 $108,628  $82,542 
Sensors
  25,069   23,334 
Total revenue
 $133,697  $105,876 
          
Income from Operations by Segment:
        
Test
 $17,773  $12,753 
Sensors
  5,776   5,721 
Total income from operations
 $23,549  $18,474