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Goodwill, Other Intangible Assets and Other Assets - Other Intangible Assets (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 27, 2014 | Sep. 28, 2013 | Sep. 27, 2014 | Sep. 28, 2013 | Dec. 28, 2013
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Gross | $ 31,500,000 |  | $ 31,500,000 |  | $ 31,500,000
Intangible assets accumulated amortization | 9,693,000 |  | 9,693,000 |  | 7,044,000
Finite-lived intangible assets, accumulated impairment loss | 1,788,000 |  | 1,788,000 |  | 1,788,000
Intangible Assets, Net | 20,019,000 |  | 20,019,000 |  | 22,668,000
Amortization of Acquired Intangible Assets | 900,000 | 900,000 | 2,700,000 | 2,800,000 |
Completed technology |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 30,600,000 |  | 30,600,000 |  | 30,600,000
Intangible assets accumulated amortization | 8,826,000 |  | 8,826,000 |  | 6,202,000
Finite-lived intangible assets, accumulated impairment loss | 1,788,000 |  | 1,788,000 |  | 1,788,000
Intangible Assets, Net | 19,986,000 |  | 19,986,000 |  | 22,610,000
Research contracts |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 100,000 |  | 100,000 |  | 100,000
Intangible assets accumulated amortization | 100,000 |  | 100,000 |  | 100,000
Finite-lived intangible assets, accumulated impairment loss | 0 |  | 0 |  | 0
Intangible Assets, Net | 0 |  | 0 |  | 0
Trade Names |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 800,000 |  | 800,000 |  | 800,000
Intangible assets accumulated amortization | 767,000 |  | 767,000 |  | 742,000
Finite-lived intangible assets, accumulated impairment loss | 0 |  | 0 |  | 0
Intangible Assets, Net | $ 33,000 |  | $ 33,000 |  | $ 58,000

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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