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 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Disaggregation of Revenue [Line Items]        
Sales $ 106,506 $ 177,018 $ 387,784 $ 574,290
Aerospace Segment        
Disaggregation of Revenue [Line Items]        
Sales 82,548 157,702 326,191 520,490
Test Systems Segment        
Disaggregation of Revenue [Line Items]        
Sales 23,958 19,316 61,593 53,800
Electrical Power & Motion        
Disaggregation of Revenue [Line Items]        
Sales 32,481 78,428 148,500 255,007
Lighting & Safety        
Disaggregation of Revenue [Line Items]        
Sales 25,320 44,127 90,973 139,502
Avionics        
Disaggregation of Revenue [Line Items]        
Sales 16,104 19,871 57,381 79,414
Systems Certification        
Disaggregation of Revenue [Line Items]        
Sales 605 3,384 5,596 9,050
Structures        
Disaggregation of Revenue [Line Items]        
Sales 2,432 6,089 7,528 18,056
Other        
Disaggregation of Revenue [Line Items]        
Sales $ 5,606 $ 5,803 $ 16,213 $ 19,461