GOODWILL AND INTANGIBLE ASSETS - Goodwill - Changes in the Carrying Amount of Goodwill Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
Jan. 02, 2016	Jan. 03, 2015
Changes in the carrying amount of goodwill:
Goodwill, Beginning Balance	$ 97,524	$ 78,801
Goodwill allocated to acquisition	6,922	19,543
Foreign currency impact	(686)	(820)
Goodwill, Ending Balance	103,760	97,524
Photonics
Changes in the carrying amount of goodwill:
Goodwill, Beginning Balance	51,350	51,350
Goodwill, Ending Balance	51,350	51,350
Lasers
Changes in the carrying amount of goodwill:
Goodwill, Beginning Balance	25,199	6,476
Goodwill allocated to acquisition	6,922	19,543
Foreign currency impact	(686)	(820)
Goodwill, Ending Balance	31,435	25,199
Optics
Changes in the carrying amount of goodwill:
Goodwill, Beginning Balance	20,975	20,975
Goodwill, Ending Balance	$ 20,975	$ 20,975

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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