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Goodwill and Other Intangible Assets (Details) (USD $) | 12 Months Ended
--- | ---
Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Goodwill |  |  |
Goodwill, Beginning Balance | $ 228,781,000 us-gaap_Goodwill | $ 130,265,000 us-gaap_Goodwill |
Additions due to business combinations |  | 98,516,000 us-gaap_GoodwillAcquiredDuringPeriod |
Goodwill, Ending Balance | 228,781,000 us-gaap_Goodwill | 228,781,000 us-gaap_Goodwill | 130,265,000 us-gaap_Goodwill
Gross carrying amount and accumulated amortization of other intangible assets |  |  |
Weighted-Average Amortization Period | 9 years |  |
Intangible assets subject to amortization, Gross Amount | 168,601,000 us-gaap_FiniteLivedIntangibleAssetsGross | 158,050,000 us-gaap_FiniteLivedIntangibleAssetsGross |
Intangible assets subject to amortization, Accumulated Amortization | (53,580,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (45,057,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Total intangible assets, Gross Amount | 168,601,000 us-gaap_IntangibleAssetsGrossExcludingGoodwill | 176,650,000 us-gaap_IntangibleAssetsGrossExcludingGoodwill |
Fully amortized intangible assets, gross | 9,400,000 slab_IntangibleAssetsFullyAmortizedGrossExcludingGoodwill |  |
Amortization expense related to intangible assets | 17,900,000 us-gaap_AmortizationOfIntangibleAssets | 14,600,000 us-gaap_AmortizationOfIntangibleAssets | 10,700,000 us-gaap_AmortizationOfIntangibleAssets
Estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years |  |  |
2015 | 19,331,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |
2016 | 18,682,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |
2017 | 17,715,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |
2018 | 16,690,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |
2019 | 14,251,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |
In-process research and development |  |  |
Gross carrying amount and accumulated amortization of other intangible assets |  |  |
Intangible assets not subject to amortization, Gross and Net Amount |  | 18,600,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |
Core and developed technology |  |  |
Gross carrying amount and accumulated amortization of other intangible assets |  |  |
Weighted-Average Amortization Period | 9 years |  |
Intangible assets subject to amortization, Gross Amount | 148,891,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = slab_CoreAndDevelopedTechnologyMember | 138,340,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = slab_CoreAndDevelopedTechnologyMember |
Intangible assets subject to amortization, Accumulated Amortization | (47,894,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = slab_CoreAndDevelopedTechnologyMember | (41,782,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = slab_CoreAndDevelopedTechnologyMember |
Customer relationships |  |  |
Gross carrying amount and accumulated amortization of other intangible assets |  |  |
Weighted-Average Amortization Period | 9 years |  |
Intangible assets subject to amortization, Gross Amount | 14,500,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 14,500,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Intangible assets subject to amortization, Accumulated Amortization | (4,003,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (2,330,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Patents |  |  |
Gross carrying amount and accumulated amortization of other intangible assets |  |  |
Weighted-Average Amortization Period | 6 years |  |
Intangible assets subject to amortization, Gross Amount | 3,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 3,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Intangible assets subject to amortization, Accumulated Amortization | (1,250,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | (750,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Trademarks |  |  |
Gross carrying amount and accumulated amortization of other intangible assets |  |  |
Weighted-Average Amortization Period | 10 years |  |
Intangible assets subject to amortization, Gross Amount | 2,210,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 2,210,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |
Intangible assets subject to amortization, Accumulated Amortization | $ (433,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | $ (195,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -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 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 -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 + Details
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