Quarterly report pursuant to Section 13 or 15(d)

Revenue - Disaggregated by Product Lines (Details)

v3.21.1
Revenue - Disaggregated by Product Lines (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 03, 2021
Mar. 28, 2020
Disaggregation of Revenue [Line Items]    
Sales $ 105,857 $ 157,584
Aerospace Segment    
Disaggregation of Revenue [Line Items]    
Sales 81,416 141,070
Test Systems Segment    
Disaggregation of Revenue [Line Items]    
Sales 24,441 16,514
Electrical Power & Motion    
Disaggregation of Revenue [Line Items]    
Sales 29,344 69,456
Lighting & Safety    
Disaggregation of Revenue [Line Items]    
Sales 27,100 37,922
Avionics    
Disaggregation of Revenue [Line Items]    
Sales 14,843 22,143
Systems Certification    
Disaggregation of Revenue [Line Items]    
Sales 878 3,331
Structures    
Disaggregation of Revenue [Line Items]    
Sales 1,053 3,042
Other    
Disaggregation of Revenue [Line Items]    
Sales $ 8,198 $ 5,176