Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 160,192	$ 147,309	$ 317,343	$ 320,784
Electronic Systems
Disaggregation of Revenue [Line Items]
Revenue	102,797	91,950	201,901	190,070
Structural Systems
Disaggregation of Revenue [Line Items]
Revenue	57,395	55,359	115,442	130,714
Military and space
Disaggregation of Revenue [Line Items]
Revenue	113,008	94,522	227,135	196,421
Military and space | Electronic Systems
Disaggregation of Revenue [Line Items]
Revenue	80,755	69,166	162,488	143,483
Military and space | Structural Systems
Disaggregation of Revenue [Line Items]
Revenue	32,253	25,356	64,647	52,938
Commercial aerospace
Disaggregation of Revenue [Line Items]
Revenue	37,577	39,635	72,954	100,217
Commercial aerospace | Electronic Systems
Disaggregation of Revenue [Line Items]
Revenue	12,435	9,632	22,159	22,441
Commercial aerospace | Structural Systems
Disaggregation of Revenue [Line Items]
Revenue	25,142	30,003	50,795	77,776
Industrial
Disaggregation of Revenue [Line Items]
Revenue	9,607	13,152	17,254	24,146
Industrial | Electronic Systems
Disaggregation of Revenue [Line Items]
Revenue	$ 9,607	$ 13,152	$ 17,254	$ 24,146