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Stock Repurchase Program - Additional Information (Detail) (Common Stock, USD $) | Nov. 30, 2008 | Apr. 29, 2014
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Repurchase Program 2011 |  |
Equity [Line Items] |  |
Repurchase of authorized common stock | $ 80,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = cgnx_RepurchaseProgram2011Member / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Repurchase Program 2014 |  |
Equity [Line Items] |  |
Repurchase of authorized common stock |  | $ 50,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = cgnx_RepurchaseProgram2014Member / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember

X
- Details
Name: | cgnx_EquityLineItems
Namespace Prefix: | cgnx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant