Goodwill - Summary of Changes in Carrying Amount of Goodwill (Details) $ in Thousands	6 Months Ended
	Jul. 03, 2021 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 58,282
Foreign Currency Translation	47
Balance at end of period	58,329
Operating Segments | Aerospace Segment
Goodwill [Roll Forward]
Balance at beginning of period	36,648
Foreign Currency Translation	47
Balance at end of period	36,695
Operating Segments | Test Systems Segment
Goodwill [Roll Forward]
Balance at beginning of period	21,634
Foreign Currency Translation	0
Balance at end of period	$ 21,634