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Employee Savings Plan	12 Months Ended
	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]
Employee Savings Plan	NOTE 16:  Employee Savings Plan Under the Company’s Employee Savings Plan, a defined contribution plan, U.S. employees who have attained age 21 may contribute up to 25% of their salary on a pretax basis subject to the annual dollar limitations established by the Internal Revenue Service. The Company currently contributes fifty cents for each dollar an employee contributes, with a maximum contribution of 3% of an employee’s pretax salary. Company contributions vest 20%, 40%, 60%, and 100% after two, three, four, and five years of continuous employment with the Company, respectively. Company contributions totaled $1,423,000 in 2013, $1,362,000 in 2012, and $1,218,000 in 2011. Cognex stock is not an investment alternative and Company contributions are not made in the form of Cognex stock.

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- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-URI http://asc.fasb.org/topic&trid=2235017

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