Restructuring, Acquisition and Divestiture Related Costs - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Restructuring and Acquisition Related Costs [Line Items]
Restructuring Costs			$ (1,621)	$ 200	$ 3,063
Proceeds from the sale of property, plant and equipment				44	7,037
Acquisition and related charges		$ 3,834	786	$ 6,032	2,765
2016 Restructuring
Restructuring and Acquisition Related Costs [Line Items]
Restructuring plan				During the third quarter of 2015, the Company initiated the 2016 restructuring program, which included consolidating certain of its manufacturing operations to optimize its facility footprint and better utilize resources, costs associated with discontinuing its radiology product line and reducing redundant costs due to productivity cost savings and business volume reductions. The Company substantially completed the 2016 restructuring program during the second quarter of 2016. As of September 29, 2017, the Company incurred cumulative costs related to this restructuring plan totaling $6.4 million. The Company expects to incur additional restructuring charges of $0.2 million to $0.3 million related to the 2016 restructuring plan.
Restructuring Costs			$ (1,621)	$ 186	2,955
2016 Restructuring | Cumulative Restructuring Costs
Restructuring and Acquisition Related Costs [Line Items]
Restructuring Costs				6,400
2016 Restructuring | Minimum | Additional Restructuring Costs
Restructuring and Acquisition Related Costs [Line Items]
Restructuring Costs				200
2016 Restructuring | Maximum | Additional Restructuring Costs
Restructuring and Acquisition Related Costs [Line Items]
Restructuring Costs				$ 300
2011 Restructuring
Restructuring and Acquisition Related Costs [Line Items]
Restructuring plan				In November 2011, the Company announced a strategic initiative (“2011 restructuring”), which aimed to consolidate operations to reduce the Company’s cost structure and improve operational efficiency. As part of this initiative, the Company eliminated facilities through the consolidation of certain manufacturing, sales and distribution facilities and the exit of Semiconductor Systems and Laser Systems businesses. The Company substantially completed the 2011 restructuring program by the end of 2013. In March 2016, the Company sold its previously exited Laser Systems facility located in Orlando, Florida for cash at the net carrying value of $3.5 million. In December 2016, the lease agreement for the Company’s previously exited laser scanner business facility was terminated.
Restructuring Costs				$ 14	$ 108
2011 Restructuring | Orlando Facility
Restructuring and Acquisition Related Costs [Line Items]
Proceeds from the sale of property, plant and equipment	$ 3,500