XML 49 R38.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Cash, Cash Equivalents, and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail) $ in Thousands | Apr. 02, 2017 USD ($)
--- | ---
Schedule of Available-for-sale Securities [Line Items] |
1 year or less | $ 376,027
1-2 years | 164,659
2-3 years | 113,813
3-4 years | 9,584
4-5 years | 21,234
5-7 years | 3,560
Fair value | 688,877
Corporate Bonds |
Schedule of Available-for-sale Securities [Line Items] |
1 year or less | 128,507
1-2 years | 87,341
2-3 years | 82,646
3-4 years | 3,928
4-5 years | 21,213
5-7 years | 0
Fair value | 323,635
Asset-Backed Securities |
Schedule of Available-for-sale Securities [Line Items] |
1 year or less | 58,649
1-2 years | 9,960
2-3 years | 23,850
3-4 years | 5,656
4-5 years | 21
5-7 years | 3,560
Fair value | 101,696
Treasury Bills |
Schedule of Available-for-sale Securities [Line Items] |
1 year or less | 92,883
1-2 years | 53,370
2-3 years | 0
3-4 years | 0
4-5 years | 0
5-7 years | 0
Fair value | 146,253
Sovereign Bonds |
Schedule of Available-for-sale Securities [Line Items] |
1 year or less | 12,340
1-2 years | 13,988
2-3 years | 4,589
3-4 years | 0
4-5 years | 0
5-7 years | 0
Fair value | 30,917
Euro Liquidity Fund |
Schedule of Available-for-sale Securities [Line Items] |
1 year or less | 73,868
1-2 years | 0
2-3 years | 0
3-4 years | 0
4-5 years | 0
5-7 years | 0
Fair value | 73,868
Agency Bonds |
Schedule of Available-for-sale Securities [Line Items] |
1 year or less | 7,620
1-2 years | 0
2-3 years | 2,728
3-4 years | 0
4-5 years | 0
5-7 years | 0
Fair value | 10,348
Municipal Bonds |
Schedule of Available-for-sale Securities [Line Items] |
1 year or less | 2,160
1-2 years | 0
2-3 years | 0
3-4 years | 0
4-5 years | 0
5-7 years | 0
Fair value | $ 2,160

X
- Definition Available For Sale Securities Debt Maturities After Five Years Before Seven Years Fair Value + References No definition available. + Details
Name: | cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsBeforeSevenYearsFairValue
Namespace Prefix: | cgnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available-for-sale securities, debt maturities after fourth year but before fifth year, fair value. + References No definition available. + Details
Name: | cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterFourYearsBeforeFiveYearsFairValue
Namespace Prefix: | cgnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the fair value of debt securities which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterOneYearBeforeTwoYearsFairValue
Namespace Prefix: | cgnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available-for-sale securities, debt maturities after third year but before fourth year, fair value. + References No definition available. + Details
Name: | cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsBeforeFourYearsFairValue
Namespace Prefix: | cgnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available-for-sale securities, debt maturities after second year but before third year, fair value. + References No definition available. + Details
Name: | cgnx_AvailableForSaleSecuritiesDebtMaturitiesAfterTwoYearsBeforeThreeYearsFairValue
Namespace Prefix: | cgnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of available-for-sale debt securities maturing in the next 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 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CorporateBondSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_SovereignDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=cgnx_EuroliquidityfundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=cgnx_AgencyBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |