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Goodwill - Additional Information (Detail)
Oct. 04, 2010
MVSD [Member]  
Goodwill [Line Items]  
Fair value in excess to carrying value 208.00%cgnx_FairValueInExcessToCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= cgnx_MvsdMember
SISD [Member]  
Goodwill [Line Items]  
Fair value in excess to carrying value 119.00%cgnx_FairValueInExcessToCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= cgnx_SisdMember