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Stock-Based Compensation Expense - Additional Information (Detail) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 05, 2015 group | Mar. 30, 2014 | Dec. 31, 2014 | Apr. 17, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common Stock, Par or Stated Value Per Share | $ 0.002 us-gaap_CommonStockParOrStatedValuePerShare |  | $ 0.002 us-gaap_CommonStockParOrStatedValuePerShare |
Expected dividend yield | 1.25%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate |  |
Groups within the employee population | 2 cgnx_NumberOfGroupsWithinEmployeePopulation |  |  |
Percentage of stock options granted to senior management | 74.00%cgnx_PercentageOfStockOptionsGrantedToSeniorManagementExpectedToVest |  |  |
Percentage of stock options granted to all other employees | 73.00%cgnx_PercentageOfStockOptionsGrantedToAllOtherEmployeesExpectedToVest |  |  |
Estimated annual forfeiture rate | 10.00%cgnx_EstimatedForfeitureRateForUnvestedOptionsForSeniorManagement |  |  |
Estimated annual forfeiture rate for unvested options | 11.00%cgnx_EstimatedForfeitureRateForUnvestedOptionsForAllNonSeniorManagement |  |  |
Increase (decrease) to compensation expense | $ 461,000 cgnx_IncreaseInCompensationExpenseDueToRevisedEstimatedForfeitureRates | $ 288,000 cgnx_IncreaseInCompensationExpenseDueToRevisedEstimatedForfeitureRates |  |
Weighted-average grant-date fair values, in dollars per share | $ 14.34 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 15.34 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |  |
Total intrinsic value | 16,740,000 cgnx_SharesBasedCompensationArrangementBySharesBasedPaymentAwardOptionsExercisableIntrinsicValue | 8,933,000 cgnx_SharesBasedCompensationArrangementBySharesBasedPaymentAwardOptionsExercisableIntrinsicValue |  |
Total fair values of stock options vest | 13,523,000 cgnx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedFairValue | 8,361,000 cgnx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedFairValue |  |
Unrecognized compensation expense | 30,963,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |
weighted average period to be recognized | 2 years 1 month 5 days |  |  |
Recognized Period Costs Capitalized Amount | $ 0 cgnx_EmployeeServiceShareBasedCompensationRecognizedPeriodCostsCapitalizedAmount |  | $ 0 cgnx_EmployeeServiceShareBasedCompensationRecognizedPeriodCostsCapitalizedAmount |
Stock Option And Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period for stock option plans | 4 years |  |  |
Expiration period from grant day | 10 years |  |  |
General Stock Option Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period for stock option plans | 4 years |  |  |
Employee Stock Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for grant under stock option plans | 7,823,929 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Expiration period from grant day | 10 years |  |  |
2015 Through Expected Life of Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expected dividend yield | 1.25%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = cgnx_TwoThousandFifteenThroughExpectedLifeOfOptionMember |  |  |
Subsequent Event [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common Stock, Par or Stated Value Per Share |  |  |  | $ 0.002 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event [Member] | Employee Stock Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
additional shares under Share-based Compensation Arrangement by Share-based Payment Award, Additional Number of Shares Available for Grant |  |  |  | 2,000,000 cgnx_AdditionalsharesunderSharebasedCompensationArrangementbySharebasedPaymentAwardAdditionalNumberofSharesAvailableforGrant / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Common Stock, Par or Stated Value Per Share |  |  |  | $ 0.002 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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