Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Oct. 02, 2020	Oct. 01, 2021	Oct. 02, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 179,836	$ 213,959	$ 533,846	$ 599,171
Revenue, Net, Percentage	100.00%	100.00%	100.00%	100.00%
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	41.00%	25.00%	37.00%	31.00%
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	59.00%	75.00%	63.00%	69.00%
Military and Defense, other than fuzes [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 43,017	$ 46,324	$ 126,408	$ 137,281
Missile and Bomb Fuzes [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 49,393	$ 81,252	$ 148,985	$ 196,238
Revenue, Net, Percentage	27.00%	38.00%	28.00%	33.00%
Commercial Aerospace [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 44,746	$ 52,894	$ 133,834	$ 164,006
Medical [Member]
Disaggregation of Revenue [Line Items]
Net sales	21,996	17,506	65,441	53,245
Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 20,684	$ 15,983	$ 59,178	$ 48,401
Original Equipment Manufacturer [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	56.00%	49.00%	58.00%	55.00%
Aftermarket [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	17.00%	13.00%	14.00%	12.00%