Quarterly report pursuant to Section 13 or 15(d)

Revenue - Disaggregated by Product Lines (Details)

v3.19.1
Revenue - Disaggregated by Product Lines (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Sales $ 208,174 $ 179,059
Aerospace Segment    
Disaggregation of Revenue [Line Items]    
Sales 188,501 164,600
Test Systems Segment    
Disaggregation of Revenue [Line Items]    
Sales 19,673 14,459
Electrical Power & Motion    
Disaggregation of Revenue [Line Items]    
Sales 92,537 72,678
Lighting & Safety    
Disaggregation of Revenue [Line Items]    
Sales 48,605 41,642
Avionics    
Disaggregation of Revenue [Line Items]    
Sales 33,861 33,023
Systems Certification    
Disaggregation of Revenue [Line Items]    
Sales 1,618 4,783
Structures    
Disaggregation of Revenue [Line Items]    
Sales 5,947 5,603
Other    
Disaggregation of Revenue [Line Items]    
Sales $ 5,933 $ 6,871