Annual report pursuant to Section 13 and 15(d)

Revenue - Revenue Disaggregated by Market (Details)

v3.20.4
Revenue - Revenue Disaggregated by Market (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 26, 2020
Jun. 27, 2020
Mar. 28, 2020
Dec. 31, 2019
Sep. 28, 2019
Jun. 29, 2019
Mar. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]                      
Sales $ 114,803 $ 106,506 $ 123,694 $ 157,584 $ 198,412 $ 177,018 $ 189,098 $ 208,174 $ 502,587 $ 772,702 $ 803,256
Commercial Transport                      
Disaggregation of Revenue [Line Items]                      
Sales                 262,636 523,921 536,269
Military                      
Disaggregation of Revenue [Line Items]                      
Sales                 67,944 76,542 68,138
Business Jet                      
Disaggregation of Revenue [Line Items]                      
Sales                 60,437 67,541 43,090
Other                      
Disaggregation of Revenue [Line Items]                      
Sales                 26,971 24,605 28,128
Aerospace                      
Disaggregation of Revenue [Line Items]                      
Sales                 417,988 692,609 675,625
Semiconductor                      
Disaggregation of Revenue [Line Items]                      
Sales                 3,483 9,692 84,254
Aerospace & Defense                      
Disaggregation of Revenue [Line Items]                      
Sales                 81,116 70,401 43,377
Test Systems                      
Disaggregation of Revenue [Line Items]                      
Sales                 $ 84,599 $ 80,093 $ 127,631