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Business Segment Information (Tables)
 6 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Financial Information By Reportable Segment
Financial information by reportable segment is as follows:
 
 
Three Months Ended
 
Six Months Ended
 
 
March 31,
2018
 
April 1,
2017
 
March 31,
2018
 
April 1,
2017
Revenue
 
 
 
 
 
 
 
 
Test
 
$
110,238

 
$
123,840

 
$
228,441

 
$
254,966

Sensors
 
81,542

 
69,584

 
157,501

 
137,737

Intersegment eliminations
 
(457
)
 
—

 
(457
)
 
—

Total revenue
 
$
191,323

 
$
193,424

 
$
385,485

 
$
392,703

 
 
 
 
 
 
 
 
 
Income from operations
 
 
 
 
 
 
 
 
Test
 
$
3,295

 
$
6,367

 
$
8,904

 
$
18,083

Sensors
 
13,337

 
9,045

 
24,225

 
7,619

Intersegment eliminations
 
(22
)
 
—

 
(22
)
 
—

Total income from operations
 
$
16,610

 
$
15,412

 
$
33,107

 
$
25,702