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Formation and Nature of Business	12 Months Ended
Formation and Nature of Business	Dec. 27, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Formation and Nature of Business	Formation and Nature of Business FormFactor, Inc. is a leading provider of electrical and optical test and measurement technologies along the full semiconductor product lifecycle - from characterization, modeling, reliability, and design de-bug, to qualification and production test. We provide a broad range of high-performance probe cards, analytical probes, probe stations, thermal systems, and cryogenic systems to both semiconductor companies and scientific institutions. Our products provide electrical and optical information from a variety of semiconductor and electro-optical devices and integrated circuits from early research, through development, to high-volume production. Customers use our products and services to accelerate profitability by optimizing device performance, reducing scrap, and improving yields. Design, development and manufacturing operations are located in Livermore, Carlsbad, and Baldwin Park, California; Beaverton, Oregon; and Boulder, Colorado, all in the United States; Munich, Thiendorf, and Karlsruhe, Germany, and sales, service and support operations are located in the United States, Germany, France, Italy, South Korea, Japan, Taiwan, and Singapore. We also have smaller manufacturing operations in Yokohama, Japan. Fiscal Year Our fiscal year ends on the last Saturday in December. The fiscal years ended on December 27, 2025, December 28, 2024 and December 30, 2023 each consisted of 52 weeks.