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Business Segment Information (Tables)
 3 Months Ended
Jan. 02, 2021
Segment Reporting [Abstract]  
Financial Information by Reportable Segment
Financial information by reportable segment is as follows:
Three Months Ended
January 2,
2021		December 28,
2019
Revenue
Test & Simulation$113,223 $120,730 
Sensors85,803 85,535 
Intersegment eliminations(222)(422)
Total revenue$198,804 $205,843 
Income (Loss) from operations  
Test & Simulation$(2,951)$6,996 
Sensors7,581 8,159 
Intersegment eliminations1 3 
Total income from operations$4,631 $15,158