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v3.2.0.727

Guarantees (Detail) $ in Thousands |  | 6 Months Ended
--- | --- | ---
Jul. 06, 2015 USD ($) | Jul. 05, 2015 Category
Guarantees [Abstract] |  |
Disposalgrouplettersofcredit | $ 2,125 |
Number of categories of letters of credit | Category |  | 3

X
- Definition Letters of credit disposed as part of discontinued operations + References No definition available. + Details
Name: | cgnx_Disposalgrouplettersofcredit
Namespace Prefix: | cgnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of categories of guarantees. + References No definition available. + Details
Name: | cgnx_NumberOfCategoriesOfGuarantees
Namespace Prefix: | cgnx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_GuaranteesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration