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Stock-Based Compensation Expense - Additional Information (Detail) | 8 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) group shares | Dec. 31, 2023 USD ($) group $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | May 03, 2023 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of groups within the employee population | group | 3 | 3 |  |  |
Estimated forfeiture rate for unvested options for senior management | 8.00% | 8.00% |  |  |
Estimated forfeiture rate for unvested options for all non-senior management | 13.00% | 13.00% |  |  |
Increase in compensation expense due to revised estimated forfeiture rates |  | $ 234,000 | $ 1,536,000 | $ 255,000 |
Weighted-average grant-date fair values of stock options granted | $ / shares |  | $ 17.76 | $ 21.39 | $ 33.79 |
Total intrinsic values of stock options exercised |  | $ 6,227,000 | $ 8,424,000 | $ 80,369,000 |
Total fair values of stock options vested |  | 34,751,000 | 41,497,000 | 45,328,000 |
Total unrecognized compensation expense related to non-vested stock options | $ 58,489,000 | $ 58,489,000 |  |  |
Recognition period for unrecognized compensation expense |  | 1 year 11 months 1 day |  |  |
Stock-based compensation expense |  | $ 54,768,000 | 54,505,000 | 43,774,000 |
Income tax benefit recognized related to stock-based compensation expense |  | 8,442,000 | 9,540,000 | 6,764,000 |
Compensation expense capitalized | $ 0 | $ 0 | $ 0 | $ 0 |
Estimated Forfeiture Rate for Unvested Options for CEO | 0 | 0 |  |  |
Cognex Corporation 2023 Stock Option And Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized | shares | 8,443,492 | 8,443,492 |  |  | 8,100,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized | shares | 343,492 |  |  |  |
Cognex Corporation 2021 And 2007 Stock Option And Incentive Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for grant under stock option plans | shares |  |  |  |  | 10,610,800
Employee Stock Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for grant under stock option plans | shares | 7,978,000 | 7,978,000 |  |  |
Expiration period of stock option plan |  | 10 years |  |  |
Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted, weighted-average exercise price | $ / shares |  | $ 44.86 | $ 62.49 |  |
Vested (in shares) | shares |  | 0 | 0 | 0 |
Granted | shares |  | 46,000 |  | 0 |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Cash used to fund tax payments |  | $ 7,836,000 | $ 2,406,000 | $ 568,000 |
Income tax benefit recognized related to stock-based compensation expense |  | $ (3,229,000) | $ (1,049,000) | $ 126,000 |
Granted, weighted-average exercise price | $ / shares |  |  | $ 58.06 | $ 87.03 |
Vested (in shares) | shares |  | 521,000 | 192,000 | 16,000 |
Minimum [Member] | Employee Stock Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period for stock option plans |  | 4 years |  |  |
Minimum [Member] | Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period for stock option plans |  | 3 years |  |  |
Minimum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period for stock option plans |  | 3 years |  |  |
Maximum [Member] | Employee Stock Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period for stock option plans |  | 5 years |  |  |
Maximum [Member] | Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period for stock option plans |  | 3 years |  |  |
Maximum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period for stock option plans |  | 4 years |  |  |

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