Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 163,227	$ 150,371	$ 480,570	$ 471,155
Electronic Systems
Disaggregation of Revenue [Line Items]
Revenue	104,721	103,470	306,622	293,540
Structural Systems
Disaggregation of Revenue [Line Items]
Revenue	58,506	46,901	173,948	177,615
Military and space
Disaggregation of Revenue [Line Items]
Revenue	113,622	111,058	340,757	307,479
Military and space | Electronic Systems
Disaggregation of Revenue [Line Items]
Revenue	81,365	80,209	243,853	223,692
Military and space | Structural Systems
Disaggregation of Revenue [Line Items]
Revenue	32,257	30,849	96,904	83,787
Commercial aerospace
Disaggregation of Revenue [Line Items]
Revenue	41,150	30,731	114,104	130,948
Commercial aerospace | Electronic Systems
Disaggregation of Revenue [Line Items]
Revenue	14,901	14,679	37,060	37,120
Commercial aerospace | Structural Systems
Disaggregation of Revenue [Line Items]
Revenue	26,249	16,052	77,044	93,828
Industrial
Disaggregation of Revenue [Line Items]
Revenue	8,455	8,582	25,709	32,728
Industrial | Electronic Systems
Disaggregation of Revenue [Line Items]
Revenue	$ 8,455	$ 8,582	$ 25,709	$ 32,728