Restructuring, Acquisition and Divestiture Related Costs - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2015	Sep. 26, 2014	Oct. 02, 2015	Sep. 26, 2014	Jul. 01, 2015
Restructuring Cost And Reserve [Line Items]
Restructuring Costs	$ 1,051	$ 233	$ 3,188	$ 73
2011 Restructuring
Restructuring Cost And Reserve [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 and Laser Systems businesses. The Company substantially completed the 2011 restructuring program by the end of 2013. Restructuring costs for the three and nine months ended October 2, 2015 included facility costs related to the Company’s vacant Orlando, Florida facility, which the Company owns and was previously occupied by the Laser Systems business. These costs were recorded in the Unallocated Corporate and Shared Services Costs segment.
2015 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring plan			During the first quarter of 2015, the Company implemented a program to eliminate redundant costs, as a result of acquisition and divestiture activities, to better align our operations to our strategic growth plans, to further integrate our business lines, and as a consequence of our productivity initiatives. During the nine months ended October 2, 2015, the Company incurred restructuring costs of $1.5 million related to the 2015 restructuring plan. Restructuring costs incurred during the nine months ended October 2, 2015 of $0.6 million, $0.5 million, $0.1 million and $0.3 million related to the Laser Products, Vision Technologies, Precision Motion and Unallocated Corporate and Shared Services Costs reportable segments, respectively.
Restructuring Costs			$ 1,484
2015 Restructuring | Vision Technologies
Restructuring Cost And Reserve [Line Items]
Restructuring Costs			500
2015 Restructuring | Precision Motion
Restructuring Cost And Reserve [Line Items]
Restructuring Costs			100
2015 Restructuring | Unallocated Corporate and Shared Services
Restructuring Cost And Reserve [Line Items]
Restructuring Costs			300
2015 Restructuring | Laser Products
Restructuring Cost And Reserve [Line Items]
Restructuring Costs			$ 600
2016 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring plan			During the third quarter of 2015, the Company initiated a program targeting annualized savings of $4.5 million to $5.5 million after the program is fully executed. The 2016 restructuring program includes consolidating our manufacturing operations to optimize our facility footprint and better utilize resources, and reducing redundant costs due to productivity cost savings and business volume reductions. We expect to incur cash charges of $3.5 million to $4.5 million related to this program, which we anticipate completing during the second quarter of 2016. During the three and nine months ended October 2, 2015, the Company incurred restructuring costs of $0.8 million related to the 2016 restructuring plan. Restructuring costs incurred during the three and nine months ended October 2, 2015 of $0.4 million, $0.1 million and $0.3 million related to the Vision Technologies, Precision Motion and Unallocated Corporate and Shared Services Costs reportable segments, respectively.
Restructuring Costs	751		$ 751
2016 Restructuring | Minimum
Restructuring Cost And Reserve [Line Items]
Targeting annualized savings	4,500		4,500
Expected cash payments					$ 3,500
2016 Restructuring | Maximum
Restructuring Cost And Reserve [Line Items]
Targeting annualized savings	5,500		5,500
Expected cash payments					$ 4,500
2016 Restructuring | Vision Technologies
Restructuring Cost And Reserve [Line Items]
Restructuring Costs	400		400
2016 Restructuring | Precision Motion
Restructuring Cost And Reserve [Line Items]
Restructuring Costs	100		100
2016 Restructuring | Unallocated Corporate and Shared Services
Restructuring Cost And Reserve [Line Items]
Restructuring Costs	$ 300		$ 300