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Formation and Business of the Company	12 Months Ended
Formation and Business of the Company	Dec. 28, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Formation and Business of the Company	Formation and Nature of Business FormFactor, Inc. was incorporated in Delaware on April 15, 1993 and is headquartered in Livermore, California. We are a leading provider of electrical test and measurement technologies. We provide a broad range of high-performance probe cards, analytical probes, probe stations, metrology systems, and thermal sub-systems to both semiconductor companies and scientific institutions. Our products provide electrical and optical metrology information from a variety of semiconductor and electro-optical devices and integrated circuits from research, to development through production. Customers use our products and services to lower production costs, improve yields, and enable development of complex next generation products. We believe our technology leadership enables critical roadmap advances for our customers. We also design, develop, manufacture and market advanced wafer probing and thermal solutions for the electrical and optical measurement and testing of high performance semiconductor devices. Design, development and manufacturing operations are located in Beaverton, Oregon, United States and Bergisch Gladbach, Munich and Thiendorf, Germany, and sales, service and support operations are located in the United States, Germany, France, South Korea, Japan, Taiwan, China and Singapore. Fiscal Year Our fiscal year ends on the last Saturday in December. The fiscal years ended on December 28, 2019, December 29, 2018 and December 30, 2017 each consisted of 52 weeks, respectively. Reclassifications Certain immaterial reclassifications were made to the prior year financial statements to conform to the current year presentation.