Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jul. 03, 2020	Jul. 02, 2021	Jul. 03, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 182,394	$ 177,890	$ 354,010	$ 385,212
Revenue, Net, Percentage	100.00%	100.00%	100.00%	100.00%
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	36.00%	35.00%	36.00%	33.00%
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	64.00%	65.00%	64.00%	67.00%
Military and Defense, other than fuzes [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 39,780	$ 42,200	$ 83,391	$ 90,957
Missile and Bomb Fuzes [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 58,006	$ 56,986	$ 99,592	$ 114,986
Revenue, Net, Percentage	32.00%	32.00%	28.00%	30.00%
Commercial Aerospace [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 41,130	$ 47,855	$ 89,088	$ 111,112
Medical [Member]
Disaggregation of Revenue [Line Items]
Net sales	22,862	14,763	43,445	35,739
Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 20,616	$ 16,086	$ 38,494	$ 32,418
Original Equipment Manufacturer [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	55.00%	55.00%	59.00%	58.00%
Aftermarket [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	13.00%	13.00%	13.00%	12.00%