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Business Segment Information (Tables)
 9 Months Ended
Jun. 30, 2018
Segment Reporting [Abstract]  
Financial Information By Reportable Segment
Financial information by reportable segment is as follows:
 
 
Three Months Ended
 
Nine Months Ended
 
 
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
Revenue
 
 
 
 
 
 
 
 
Test
 
$
116,055

 
$
124,359

 
$
344,496

 
$
379,325

Sensors
 
79,000

 
69,405

 
236,501

 
207,142

Intersegment eliminations
 
(387
)
 
—

 
(844
)
 
—

Total revenue
 
$
194,668

 
$
193,764

 
$
580,153

 
$
586,467

 
 
 
 
 
 
 
 
 
Income from operations
 
 
 
 
 
 
 
 
Test
 
$
3,873

 
$
8,709

 
$
12,777

 
$
26,792

Sensors
 
12,398

 
7,908

 
36,623

 
15,527

Intersegment eliminations
 
(7
)
 
—

 
(29
)
 
—

Total income from operations
 
$
16,264

 
$
16,617

 
$
49,371

 
$
42,319