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Subsequent Events	12 Months Ended
	Dec. 28, 2024
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Advantest Private Placement On January 10, 2025, Advantest America, Inc., a Delaware corporation, acquired 334,971 shares of FormFactor's common stock in a private placement for $44.78 per share, representing the 5-day trailing volume-weighted average price prior to signing the related private placement agreement. FICT Equity Investment On February 21, 2025, we, together with MBK Partners, a private equity firm, acquired FICT Limited (“FICT”) from Advantage Partners Inc. In connection with the acquisition, we obtained a 20% equity interest in FICT, in exchange for funding $59.6 million of the purchase price. Headquartered in Nagano, Japan, FICT is a provider of semiconductor test and high-performance computing industries with complex multi-layer organic substrates, printed circuit boards, and related leading-edge technologies and services. Under the equity method, upon closing this investment, the investment will be included as a separate item in our Consolidated Balance Sheets and we will record our proportionate share of FICT’s net income or loss as a separate item in our Consolidated Statements of Operations.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/855/tableOfContent

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

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