Segment and Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2022	Jul. 02, 2021	Jul. 01, 2022	Jul. 02, 2021
Disaggregation of Revenue [Line Items]
Net sales	$ 160,766	$ 182,394	$ 318,814	$ 354,010
Operating Income (Loss)	$ 2,280	$ 14,832	$ 5,337	$ 20,445
Revenue, Net, Percentage	100.00%	100.00%	100.00%	100.00%
Research and Development Expense	$ 5,215	$ 3,238	$ 10,328	$ 7,464
Military and Defense, other than fuzes [Member]
Disaggregation of Revenue [Line Items]
Net sales	32,069	39,780	63,299	83,391
Missile and Bomb Fuzes [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 21,563	$ 58,006	$ 58,885	$ 99,592
Revenue, Net, Percentage	13.00%	32.00%	18.00%	28.00%
Commercial Aerospace [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 60,858	$ 41,130	$ 107,816	$ 89,088
Medical [Member]
Disaggregation of Revenue [Line Items]
Net sales	25,000	22,862	48,128	43,445
Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 21,276	$ 20,616	$ 40,686	$ 38,494
Original Equipment Manufacturer [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	67.00%	55.00%	65.00%	59.00%
Aftermarket [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	20.00%	13.00%	17.00%	13.00%
Engineered Products
Disaggregation of Revenue [Line Items]
Net sales	$ 89,765	$ 78,956	$ 171,217	$ 150,735
Operating Income (Loss)	$ 15,467	$ 9,758	$ 26,509	$ 14,664
Revenue, Net, Percentage	56.00%	43.00%	54.00%	43.00%
Research and Development Expense	$ 2,121	$ 1,781	$ 4,364	$ 4,603
Engineered Products | Military and Defense, other than fuzes [Member]
Disaggregation of Revenue [Line Items]
Net sales	9,342	11,857	18,995	23,085
Engineered Products | Missile and Bomb Fuzes [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0
Revenue, Net, Percentage	0.00%	0.00%	0.00%	0.00%
Engineered Products | Commercial Aerospace [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 37,644	$ 26,860	$ 70,022	$ 51,932
Engineered Products | Medical [Member]
Disaggregation of Revenue [Line Items]
Net sales	22,683	21,025	43,832	39,677
Engineered Products | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 20,096	$ 19,214	$ 38,368	$ 36,041
Engineered Products | Original Equipment Manufacturer [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	43.00%	34.00%	42.00%	34.00%
Engineered Products | Aftermarket [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	13.00%	9.00%	12.00%	9.00%
Precision Products
Disaggregation of Revenue [Line Items]
Net sales	$ 41,267	$ 71,539	$ 88,816	$ 132,072
Operating Income (Loss)	$ 2,550	$ 19,429	$ 5,959	$ 32,482
Revenue, Net, Percentage	26.00%	39.00%	28.00%	37.00%
Research and Development Expense	$ 2,984	$ 1,436	$ 5,787	$ 2,838
Precision Products | Military and Defense, other than fuzes [Member]
Disaggregation of Revenue [Line Items]
Net sales	6,629	7,259	11,951	14,253
Precision Products | Missile and Bomb Fuzes [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 21,563	$ 58,006	$ 58,885	$ 99,592
Revenue, Net, Percentage	13.00%	32.00%	18.00%	28.00%
Precision Products | Commercial Aerospace [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 11,895	$ 4,872	$ 15,662	$ 15,774
Precision Products | Medical [Member]
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Precision Products | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 1,180	$ 1,402	$ 2,318	$ 2,453
Precision Products | Original Equipment Manufacturer [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	6.00%	3.00%	5.00%	5.00%
Precision Products | Aftermarket [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	7.00%	4.00%	5.00%	4.00%
Structures
Disaggregation of Revenue [Line Items]
Net sales	$ 29,734	$ 31,899	$ 58,781	$ 71,203
Operating Income (Loss)	$ (830)	$ (1,521)	$ (1,447)	$ (1,201)
Revenue, Net, Percentage	18.00%	18.00%	18.00%	20.00%
Research and Development Expense	$ 110	$ 21	$ 177	$ 23
Structures | Military and Defense, other than fuzes [Member]
Disaggregation of Revenue [Line Items]
Net sales	16,098	20,664	32,353	46,053
Structures | Missile and Bomb Fuzes [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0
Revenue, Net, Percentage	0.00%	0.00%	0.00%	0.00%
Structures | Commercial Aerospace [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 11,319	$ 9,398	$ 22,132	$ 21,382
Structures | Medical [Member]
Disaggregation of Revenue [Line Items]
Net sales	2,317	1,837	4,296	3,768
Structures | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0
Structures | Original Equipment Manufacturer [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	18.00%	18.00%	18.00%	20.00%
Structures | Aftermarket [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	0.00%	0.00%	0.00%	0.00%
Corporate Segment
Disaggregation of Revenue [Line Items]
Operating Income (Loss)	$ (11,984)	$ (10,314)	$ (22,532)	$ (20,679)
Other unallocated expenses, net
Disaggregation of Revenue [Line Items]
Operating Income (Loss)	$ (2,923)	$ (2,520)	$ (3,152)	$ (4,821)