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Formation and Nature of Business	12 Months Ended
	Dec. 28, 2024
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; Boulder, Colorado; and Woburn, Massachusetts, all in the United States; Munich and Thiendorf, 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 28, 2024, December 30, 2023 and December 31, 2022 consisted of 52 weeks, 52 weeks, and 53 weeks, respectively. The first three fiscal quarters in our fiscal year ended December 31, 2022 contained 13 weeks, and the fourth fiscal quarter contained 14 weeks.

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- Definition

The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 275
-Publisher FASB
-URI https://asc.fasb.org/275/tableOfContent

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-SubTopic 10
-Topic 275
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-1

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