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Subsequent Events	9 Months Ended
Subsequent Events	Oct. 02, 2011
Subsequent Events [Abstract]
Subsequent Events	NOTE 16: Subsequent Events On November 1, 2011, the Company’s Board of Directors declared a cash dividend of $0.10 per share. The dividend is payable on December 16, 2011 to all shareholders of record at the close of business on December 2, 2011. In addition, on November 1, 2011, the Company’s Board of Directors authorized the repurchase of up to $80,000,000 of Cognex common stock in open market transactions to help reduce share dilution associated with equity incentive plans. This new authorization will commence once the Company completes the existing $50,000,000 repurchase program, of which approximately $20,000,000 remains available.