GOODWILL AND INTANGIBLE ASSETS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 04, 2015	Jan. 03, 2015
Changes in the carrying amount of goodwill
Goodwill, gross at the beginning of the period	$ 269,883us-gaap_GoodwillGross
Accumulated impairment losses at the beginning of the period	(172,359)
Goodwill, Beginning Balance	97,524us-gaap_Goodwill
Goodwill acquired	7,841us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency impact	(722)us-gaap_GoodwillTranslationAdjustments
Goodwill, gross at the end of the period	277,002us-gaap_GoodwillGross
Accumulated impairment losses at the end of the period	(172,359)
Goodwill, Ending Balance	104,643us-gaap_Goodwill
Photonics
Changes in the carrying amount of goodwill
Goodwill, gross at the beginning of the period		98,808
Accumulated impairment losses at the beginning of the period		(47,458)
Goodwill, Beginning Balance		51,350
Goodwill, gross at the end of the period	98,808	98,808
Accumulated impairment losses at the end of the period	(47,458)	(47,458)
Goodwill, Ending Balance	51,350	51,350
Lasers
Changes in the carrying amount of goodwill
Goodwill, gross at the beginning of the period	129,761
Accumulated impairment losses at the beginning of the period	(104,562)
Goodwill, Beginning Balance	25,199
Goodwill acquired	7,841
Foreign currency impact	(722)
Goodwill, gross at the end of the period	136,880
Accumulated impairment losses at the end of the period	(104,562)
Goodwill, Ending Balance	32,318
Optics
Changes in the carrying amount of goodwill
Goodwill, gross at the beginning of the period		41,314
Accumulated impairment losses at the beginning of the period		(20,339)
Goodwill, Beginning Balance		20,975
Goodwill, gross at the end of the period	41,314	41,314
Accumulated impairment losses at the end of the period	(20,339)	(20,339)
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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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)

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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

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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.

+ 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)

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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

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