Summary of Restructuring Costs for Each Segment and Unallocated Corporate Costs (Details) $ in Thousands	3 Months Ended
	Mar. 29, 2019 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring costs	$ 1,236
2019 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring costs	967
Photonics | 2019 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring costs	193
Vision | 2019 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring costs	350
Precision Motion | 2019 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring costs	47
Unallocated Corporate and Shared Services | 2019 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring costs	$ 377