XML 25 R57.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Stock-Based Compensation Expense - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2013 OptionPlan Employees | Dec. 31, 2012 | Sep. 30, 2012 | Sep. 29, 2013 OptionPlan Employees | Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for grant under stock option plans | 11,178,930 |  |  | 11,178,930 |
Number of stock option plans | 2 |  |  | 2 |
Expected dividend yield | 0.00% | 0.00% | 1.20% | 0.00% | 1.20%
Weighted-average grant-date fair values of stock options granted | $ 8.07 |  | $ 6.48 | $ 8.07 | $ 6.58
Number of groups within the employee population | 2 |  |  | 2 |
Percentage of stock options granted to senior management expected to vest | 71.00% |  |  | 71.00% |
Percentage of stock options granted to all other employees expected to vest | 69.00% |  |  | 69.00% |
Estimated forfeiture rate for unvested options for senior management | 12.00% |  |  | 12.00% |
Estimated forfeiture rate for unvested options for all non-senior management | 13.00% |  |  | 13.00% |
Stock-based compensation expense | $ 2,220,000 |  | $ 1,492,000 | $ 8,299,000 | $ 6,795,000
Income tax benefit recognized related to stock-based compensation expense | 721,000 |  | 478,000 | 2,725,000 | 2,212,000
Compensation expense was capitalized | 0 | 0 |  | 0 |
Total intrinsic values of stock options exercised | 14,422,000 |  | 1,436,000 | 28,374,000 | 14,744,000
Total fair values of stock options vest | 197,000 |  | 242,000 | 9,428,000 | 8,927,000
Total unrecognized compensation expense related to non-vested stock options | $ 10,411,000 |  |  | $ 10,411,000 |
Weighted-average period for unrecognized compensation expense related to non-vested stock options (years) |  |  |  | 1 year 4 months 24 days |
General Stock Option Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for grant under stock option plans | 8,660,710 |  |  | 8,660,710 |
Expiration period of stock option plan |  |  |  | 10 years |
Vesting period for stock option plans |  |  |  | 4 years |
Stock Option and Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for grant under stock option plans | 2,518,220 |  |  | 2,518,220 |
Expiration period of stock option plan |  |  |  | 10 years |
Vesting period for stock option plans |  |  |  | 4 years |
2015 Through Expected Life of Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected dividend yield |  |  |  | 1.04% |

X
- Definition Employee service share based compensation recognized period costs capitalized amount. + References No definition available. + Details
Name: | cgnx_EmployeeServiceShareBasedCompensationRecognizedPeriodCostsCapitalizedAmount
Namespace Prefix: | cgnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Estimated forfeiture rate for unvested options for all non-senior management. + References No definition available. + Details
Name: | cgnx_EstimatedForfeitureRateForUnvestedOptionsForAllNonSeniorManagement
Namespace Prefix: | cgnx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Estimated forfeiture rate for unvested options for senior management. + References No definition available. + Details
Name: | cgnx_EstimatedForfeitureRateForUnvestedOptionsForSeniorManagement
Namespace Prefix: | cgnx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Expiration period of stock option plan from date the plan was approved. + References No definition available. + Details
Name: | cgnx_ExpirationPeriodOfStockOptionPlan
Namespace Prefix: | cgnx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of groups within employee population. + References No definition available. + Details
Name: | cgnx_NumberOfGroupsWithinEmployeePopulation
Namespace Prefix: | cgnx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of stock option plans. + References No definition available. + Details
Name: | cgnx_NumberOfStockOptionPlans
Namespace Prefix: | cgnx_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of stock options granted to all other employees expected to vest. + References No definition available. + Details
Name: | cgnx_PercentageOfStockOptionsGrantedToAllOtherEmployeesExpectedToVest
Namespace Prefix: | cgnx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of stock options granted to senior management expected to vest. + References No definition available. + Details
Name: | cgnx_PercentageOfStockOptionsGrantedToSeniorManagementExpectedToVest
Namespace Prefix: | cgnx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share based compensation arrangement by share based payment award options vested fair value. + References No definition available. + Details
Name: | cgnx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedFairValue
Namespace Prefix: | cgnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Shares based compensation arrangement by shares based payment award options exercisable intrinsic value. + References No definition available. + Details
Name: | cgnx_SharesBasedCompensationArrangementBySharesBasedPaymentAwardOptionsExercisableIntrinsicValue
Namespace Prefix: | cgnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
Name: | us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration