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Cash, Cash Equivalents, and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 05, 2015
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Schedule of Available-for-sale Securities [Line Items] |
1 Year or Less | $ 142,343 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
1-2 Years | 187,419 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterOneYearBeforeTwoYearsFairValue
2-3 Years | 121,779 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterTwoYearsBeforeThreeYearsFairValue
3-4 Years | 39,215 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsBeforeFourYearsFairValue
4-5 Years | 14,752 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFourYearsBeforeFiveYearsFairValue
5-8 Years | 5,312 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsBeforeEightYearsFairValue
Fair Value | 510,820 us-gaap_AvailableForSaleSecuritiesDebtSecurities
Corporate Bonds |
Schedule of Available-for-sale Securities [Line Items] |
1 Year or Less | 37,413 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember
1-2 Years | 101,597 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterOneYearBeforeTwoYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember
2-3 Years | 74,312 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterTwoYearsBeforeThreeYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember
3-4 Years | 22,542 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsBeforeFourYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember
4-5 Years | 5,770 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFourYearsBeforeFiveYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember
5-8 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsBeforeEightYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember
Fair Value | 241,634 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateBondSecuritiesMember
Treasury Bills |
Schedule of Available-for-sale Securities [Line Items] |
1 Year or Less | 31,644 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
1-2 Years | 64,524 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterOneYearBeforeTwoYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
2-3 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterTwoYearsBeforeThreeYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
3-4 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsBeforeFourYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
4-5 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFourYearsBeforeFiveYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
5-8 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsBeforeEightYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Fair Value | 96,168 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Asset-Backed Securities |
Schedule of Available-for-sale Securities [Line Items] |
1 Year or Less | 392 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
1-2 Years | 8,564 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterOneYearBeforeTwoYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
2-3 Years | 38,917 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterTwoYearsBeforeThreeYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
3-4 Years | 16,673 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsBeforeFourYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
4-5 Years | 8,982 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFourYearsBeforeFiveYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
5-8 Years | 4,312 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsBeforeEightYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
Fair Value | 77,840 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember
Supranational bonds |
Schedule of Available-for-sale Securities [Line Items] |
1 Year or Less | 1,902 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_SupranationalbondsMember
1-2 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterOneYearBeforeTwoYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_SupranationalbondsMember
2-3 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterTwoYearsBeforeThreeYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_SupranationalbondsMember
3-4 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsBeforeFourYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_SupranationalbondsMember
4-5 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFourYearsBeforeFiveYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_SupranationalbondsMember
5-8 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsBeforeEightYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_SupranationalbondsMember
Fair Value | 1,902 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_SupranationalbondsMember
Euro liquidity fund |
Schedule of Available-for-sale Securities [Line Items] |
1 Year or Less | 62,045 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_EuroliquidityfundMember
1-2 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterOneYearBeforeTwoYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_EuroliquidityfundMember
2-3 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterTwoYearsBeforeThreeYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_EuroliquidityfundMember
3-4 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsBeforeFourYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_EuroliquidityfundMember
4-5 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFourYearsBeforeFiveYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_EuroliquidityfundMember
5-8 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsBeforeEightYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_EuroliquidityfundMember
Fair Value | 62,045 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_EuroliquidityfundMember
Sovereign Bonds |
Schedule of Available-for-sale Securities [Line Items] |
1 Year or Less | 5,605 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember
1-2 Years | 6,040 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterOneYearBeforeTwoYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember
2-3 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterTwoYearsBeforeThreeYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember
3-4 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsBeforeFourYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember
4-5 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFourYearsBeforeFiveYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember
5-8 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsBeforeEightYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember
Fair Value | 11,645 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SovereignDebtSecuritiesMember
Municipal Bonds |
Schedule of Available-for-sale Securities [Line Items] |
1 Year or Less | 1,819 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
1-2 Years | 334 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterOneYearBeforeTwoYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
2-3 Years | 3,546 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterTwoYearsBeforeThreeYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
3-4 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsBeforeFourYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
4-5 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFourYearsBeforeFiveYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
5-8 Years | 1,000 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsBeforeEightYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Fair Value | 6,699 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MunicipalBondsMember
Agency Bonds |
Schedule of Available-for-sale Securities [Line Items] |
1 Year or Less | 1,523 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_AgencyBondsMember
1-2 Years | 6,360 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterOneYearBeforeTwoYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_AgencyBondsMember
2-3 Years | 5,004 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterTwoYearsBeforeThreeYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_AgencyBondsMember
3-4 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsBeforeFourYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_AgencyBondsMember
4-5 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFourYearsBeforeFiveYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_AgencyBondsMember
5-8 Years | 0 cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsBeforeEightYearsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_AgencyBondsMember
Fair Value | $ 12,887 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = cgnx_AgencyBondsMember

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