Summary of Restructuring Charges by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2021	Apr. 03, 2020
Restructuring Cost And Reserve [Line Items]
Restructuring costs	$ 1,546	$ 655
2020 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring costs	1,338
2020 Restructuring | Photonics
Restructuring Cost And Reserve [Line Items]
Restructuring costs	295
2020 Restructuring | Vision
Restructuring Cost And Reserve [Line Items]
Restructuring costs	422
2020 Restructuring | Precision Motion
Restructuring Cost And Reserve [Line Items]
Restructuring costs	$ 621