Quarterly report pursuant to Section 13 or 15(d)

Revenue - Disaggregated Revenue by Product Line (Details)

v3.10.0.1
Revenue - Disaggregated Revenue by Product Line (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Disaggregation of Revenue [Line Items]        
Revenues $ 208,606 $ 151,114 $ 387,665 $ 303,510
Aerospace        
Disaggregation of Revenue [Line Items]        
Revenues 166,204 129,547 330,804 266,374
Test Systems        
Disaggregation of Revenue [Line Items]        
Revenues 42,402 21,567 56,861 37,136
Electrical Power & Motion        
Disaggregation of Revenue [Line Items]        
Revenues 67,643 62,597 140,321 135,040
Lighting & Safety        
Disaggregation of Revenue [Line Items]        
Revenues 44,121 42,646 85,763 85,316
Avionics        
Disaggregation of Revenue [Line Items]        
Revenues 36,272 10,940 69,295 20,076
Systems Certification        
Disaggregation of Revenue [Line Items]        
Revenues 4,872 2,793 9,655 4,952
Structures        
Disaggregation of Revenue [Line Items]        
Revenues 6,497 5,880 12,100 11,877
Other        
Disaggregation of Revenue [Line Items]        
Revenues $ 6,799 $ 4,691 $ 13,670 $ 9,113