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Stock-Based Compensation Expense - Additional Information (Detail) | 12 Months Ended | 32 Months Ended |
--- | --- | --- | ---
Dec. 31, 2025 USD ($) group $ / shares shares | Dec. 31, 2024 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2025 USD ($) group shares | May 03, 2023 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of groups within the employee population | group | 2 |  |  | 2 |
Estimated forfeiture rate for unvested options for senior management | 11.00% |  |  | 11.00% |
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 | $ 4,789,000 | $ 1,832,000 | $ 234,000 |  |
Weighted-average grant-date fair values of stock options granted | $ / shares | $ 12.14 | $ 14.89 | $ 17.76 |  |
Total intrinsic values of stock options exercised | $ 4,179,000 | $ 4,626,000 | $ 6,227,000 |  |
Total fair values of stock options vested | 24,197,000 | 29,309,000 | 34,751,000 |  |
Total unrecognized compensation expense related to non-vested stock options | $ 48,015,000 |  |  | $ 48,015,000 |
Recognition period for unrecognized compensation expense | 1 year 6 months |  |  |  |
Stock-based compensation expense | $ 48,517,000 | 52,443,000 | 54,768,000 |  |
Income tax benefit recognized related to stock-based compensation expense | 6,820,000 | 8,387,000 | 8,442,000 |  |
Compensation expense capitalized | $ 0 | $ 0 | $ 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 | 9,684,542 |  |  | 9,684,542 | 8,100,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized | shares |  |  |  | 1,584,542 |
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 | 4,006,000 |  |  | 4,006,000 |
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 | $ 32.14 | $ 39.05 | $ 44.86 |  |
Vested (in shares) | shares | 0 | 0 | 0 |  |
Granted | shares | 184,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Cash used to fund tax payments | $ 6,877,000 | $ 5,017,000 | $ 7,836,000 |  |
Income tax benefit recognized related to stock-based compensation expense | $ (9,250,000) | $ (7,401,000) | $ (3,229,000) |  |
Granted, weighted-average exercise price | $ / shares |  | $ 38.90 | $ 46.14 |  |
Vested (in shares) | shares | 731,000 | 429,000 | 521,000 |  |
Performance Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period | 3 years |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Measurement Period | 3 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 |  |  |  |
Minimum [Member] | Performance Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Achievement Range, Percentage | 0.00% |  |  |  |
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] | Performance Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Achievement Range, Percentage | 120.00% |  |  |  |

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- 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/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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