Quarterly report pursuant to Section 13 or 15(d)

Revenue - Disaggregated by Product Lines (Details)

v3.21.2
Revenue - Disaggregated by Product Lines (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Jul. 03, 2021
Jun. 27, 2020
Disaggregation of Revenue [Line Items]        
Sales $ 111,158 $ 123,694 $ 217,015 $ 281,278
Aerospace Segment        
Disaggregation of Revenue [Line Items]        
Sales 89,220 102,573 170,636 243,643
Test Systems Segment        
Disaggregation of Revenue [Line Items]        
Sales 21,938 21,121 46,379 37,635
Electrical Power & Motion        
Disaggregation of Revenue [Line Items]        
Sales 34,748 46,563 64,092 116,019
Lighting & Safety        
Disaggregation of Revenue [Line Items]        
Sales 24,368 27,731 51,468 65,653
Avionics        
Disaggregation of Revenue [Line Items]        
Sales 18,021 19,134 32,864 41,277
Systems Certification        
Disaggregation of Revenue [Line Items]        
Sales 960 1,660 1,838 4,991
Structures        
Disaggregation of Revenue [Line Items]        
Sales 1,491 2,054 2,544 5,096
Other        
Disaggregation of Revenue [Line Items]        
Sales $ 9,632 $ 5,431 $ 17,830 $ 10,607