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Acquired Intangible Assets and Goodwill (Details) (USD $) In Thousands, unless otherwise specified | Dec. 27, 2014 | Dec. 28, 2013
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Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross Carrying Amount | $ 36,070 us-gaap_FiniteLivedIntangibleAssetsGross | $ 31,119 us-gaap_FiniteLivedIntangibleAssetsGross
Finite-Lived Intangible Assets, Accumulated Amortization | 22,605 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 20,120 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Patents [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross Carrying Amount | 24,220 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 24,356 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember
Finite-Lived Intangible Assets, Accumulated Amortization | 19,882 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 17,730 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember
Non-compete Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross Carrying Amount | 2,367 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 2,352 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Finite-Lived Intangible Assets, Accumulated Amortization | 2,053 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 1,943 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Customer Lists [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross Carrying Amount | 5,054 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember | 994 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Finite-Lived Intangible Assets, Accumulated Amortization | 548 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember | 325 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Trademarks [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross Carrying Amount | 4,429 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 3,417 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Finite-Lived Intangible Assets, Accumulated Amortization | $ 122 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | $ 122 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember

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