Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.18)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 12
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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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The net result for the period of deducting operating expenses from operating revenues.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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-Publisher FASB
-Name Accounting Standards Codification
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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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BUSINESS SEGMENT INFORMATION - Selected Segment Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Jan. 03, 2015	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
BUSINESS SEGMENT INFORMATION
Sales to external customers	$ 150,499	$ 147,560	$ 147,977	$ 156,655	$ 158,729	$ 146,299	$ 153,232	$ 146,890	$ 602,691	$ 605,150	$ 560,054
Depreciation and amortization									28,355	28,136	30,478
Segment income									47,389	51,765	31,281
Assets	576,643				579,927				576,643	579,927	565,229
Expenditures for long-lived assets									19,672	23,960	16,319
Photonics
BUSINESS SEGMENT INFORMATION
Sales to external customers									249,277	245,710	230,303
Lasers
BUSINESS SEGMENT INFORMATION
Sales to external customers									192,832	193,032	165,788
Optics
BUSINESS SEGMENT INFORMATION
Sales to external customers									160,582	166,408	163,963
Operating segments
BUSINESS SEGMENT INFORMATION
Depreciation and amortization									16,194	15,566	15,805
Segment income									96,084	98,618	80,478
Assets	482,529				474,995				482,529	474,995	436,016
Expenditures for long-lived assets									15,337	15,522	12,230
Operating segments \| Photonics
BUSINESS SEGMENT INFORMATION
Depreciation and amortization									3,574	4,236	4,035
Segment income									62,302	55,664	49,984
Assets	182,529				202,103				182,529	202,103	200,584
Expenditures for long-lived assets									5,314	3,499	3,561
Operating segments \| Lasers
BUSINESS SEGMENT INFORMATION
Depreciation and amortization									5,094	3,992	3,534
Segment income									17,607	25,508	18,746
Assets	164,918				148,380				164,918	148,380	111,651
Expenditures for long-lived assets									2,271	4,592	2,341
Operating segments \| Optics
BUSINESS SEGMENT INFORMATION
Depreciation and amortization									7,526	7,338	8,236
Segment income									16,175	17,446	11,748
Assets	$ 135,082				$ 124,512				135,082	124,512	123,781
Expenditures for long-lived assets									$ 7,752	$ 7,431	$ 6,328