Revenue, Gross Profit and Gross Profit Margin by Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Segment Reporting Information [Line Items]
Revenue	$ 97,734	$ 96,494	$ 188,050	$ 191,108
Gross Profit	$ 41,496	$ 41,345	$ 78,388	$ 81,351
Gross profit margin percentage	42.50%	42.80%	41.70%	42.60%
Laser Products
Segment Reporting Information [Line Items]
Revenue	$ 46,124	$ 42,190	$ 86,482	$ 87,145
Gross Profit	$ 20,861	$ 18,950	$ 38,858	$ 38,325
Gross profit margin percentage	45.20%	44.90%	44.90%	44.00%
Vision Technologies
Segment Reporting Information [Line Items]
Revenue	$ 28,305	$ 31,216	$ 57,167	$ 62,327
Gross Profit	$ 10,524	$ 12,158	$ 20,103	$ 24,671
Gross profit margin percentage	37.20%	38.90%	35.20%	39.60%
Precision Motion
Segment Reporting Information [Line Items]
Revenue	$ 23,305	$ 23,088	$ 44,401	$ 41,636
Gross Profit	$ 10,497	$ 10,611	$ 20,165	$ 19,076
Gross profit margin percentage	45.00%	46.00%	45.40%	45.80%
Unallocated Corporate and Shared Services
Segment Reporting Information [Line Items]
Gross Profit	$ (386)	$ (374)	$ (738)	$ (721)

Percentage of aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity over amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

No definition available.

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