Quarterly report pursuant to Section 13 or 15(d)

Revenue - Disaggregated by Product Lines (Details)

v3.20.2
Revenue - Disaggregated by Product Lines (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Disaggregation of Revenue [Line Items]        
Sales $ 123,694 $ 189,098 $ 281,278 $ 397,272
Aerospace Segment        
Disaggregation of Revenue [Line Items]        
Sales 102,573 174,287 243,643 362,788
Test Systems Segment        
Disaggregation of Revenue [Line Items]        
Sales 21,121 14,811 37,635 34,484
Electrical Power & Motion        
Disaggregation of Revenue [Line Items]        
Sales 46,563 84,042 116,019 176,579
Lighting & Safety        
Disaggregation of Revenue [Line Items]        
Sales 27,731 46,770 65,653 95,375
Avionics        
Disaggregation of Revenue [Line Items]        
Sales 19,134 25,682 41,277 59,543
Systems Certification        
Disaggregation of Revenue [Line Items]        
Sales 1,660 4,048 4,991 5,666
Structures        
Disaggregation of Revenue [Line Items]        
Sales 2,054 6,020 5,096 11,967
Other        
Disaggregation of Revenue [Line Items]        
Sales $ 5,431 $ 7,725 $ 10,607 $ 13,658