Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2021	Apr. 03, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 171,616	$ 207,322
Revenue, Net, Percentage	100.00%	100.00%
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	35.00%	32.00%
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	65.00%	68.00%
Military and Defense, other than fuzes [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 43,611	$ 48,757
Missile and Bomb Fuzes [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 41,586	$ 58,000
Revenue, Net, Percentage	24.00%	28.00%
Commercial Aerospace [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 47,958	$ 63,257
Medical [Member]
Disaggregation of Revenue [Line Items]
Net sales	20,583	20,976
Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 17,878	$ 16,332
Original Equipment Manufacturer [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	63.00%	61.00%
Aftermarket [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net, Percentage	13.00%	11.00%