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Business Segment Information (Tables)
 3 Months Ended
Dec. 30, 2017
Segment Reporting [Abstract]  
Financial Information By Reportable Segment
Financial information by reportable segment is as follows:
 
 
Three Months Ended
 
 
December 30,
2017
 
December 31,
2016
Revenue
 
 

 
 

Test
 
$
118,203

 
$
131,126

Sensors
 
75,959

 
68,153

Total revenue
 
$
194,162

 
$
199,279

 
 
 
 
 
Income (Loss) from Operations
 
 

 
 

Test
 
$
5,609

 
$
11,716

Sensors
 
10,888

 
(1,426
)
Total income (loss) from operations
 
$
16,497

 
$
10,290