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Sales and Gross Margin for Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 29, 2013 | Mar. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Sales | $ 83,114 |  | $ 65,186 |
Gross profit | 33,163 |  | 27,681 |
Gross profit margin percentage | 39.90% |  | 42.50% |
Laser Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 46,208 |  | 44,162 |
Gross profit | 18,038 |  | 18,585 |
Gross profit margin percentage | 39.00% |  | 42.10% |
Precision Technologies |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 36,906 |  | 21,024 |
Gross profit | 15,232 |  | 9,278 |
Gross profit margin percentage | 41.30% |  | 44.10% |
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross profit | $ (107) | [1] | $ (182) | [1]
[1] | Corporate costs primarily represent unallocated overhead related to discontinued operations.

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- Definition 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=6880815&loc=d3e20235-122688 + Details
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- Definition 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. + 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=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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