GOODWILL AND INTANGIBLE ASSETS - Goodwill - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Goodwill
Goodwill	$ 276,119	$ 269,883	$ 251,160
Accumulated impairment losses	(172,359)	(172,359)	(172,359)
Goodwill, total	103,760	97,524	78,801
Photonics
Goodwill
Goodwill	98,808	98,808	98,808
Accumulated impairment losses	(47,458)	(47,458)	(47,458)
Goodwill, total	51,350	51,350	51,350
Lasers
Goodwill
Goodwill	135,997	129,761	111,038
Accumulated impairment losses	(104,562)	(104,562)	(104,562)
Goodwill, total	31,435	25,199	6,476
Optics
Goodwill
Goodwill	41,314	41,314	41,314
Accumulated impairment losses	(20,339)	(20,339)	(20,339)
Goodwill, total	$ 20,975	$ 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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Amount before 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.

+ 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,h)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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

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