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Formation and Business of the Company	12 Months Ended
Formation and Business of the Company	Dec. 31, 2011
Formation and Business of the Company [Abstract]
Formation and Business of the Company	Formation and Business of the Company FormFactor, Inc. (the "Company") was incorporated in Delaware on April 15, 1993 and designs, develops, manufactures, sells and supports precision, high performance advanced semiconductor wafer probe cards. We are based in Livermore, California, home to our corporate offices, research and development, and manufacturing locations. We have facilities in the United States, Singapore, Japan, Taiwan, South Korea and the People's Republic of China. Fiscal Year Our fiscal year ends on the last Saturday in December. The fiscal year ended on December 31, 2011, consisted of 53 weeks and the fiscal years ended on December 25, 2010, and December 26, 2009, respectively, consisted of 52 weeks. Reclassifications Certain reclassifications have been made to the prior year's Consolidated Balance Sheets, Consolidated Statements of Cash Flows and Consolidated Statements of Operations to conform to the current year presentation. Out of Period Adjustment In the third quarter of fiscal 2010, we recorded a $4.1 million adjustment to cost of revenues net of $0.5 million income tax benefit, which resulted from an error in the calculation of capitalized manufacturing variances starting in the first quarter of fiscal 2009 through the second quarter of fiscal 2010. The error caused the understatement of cost of revenues and the overstatement of the overhead capitalized in inventory for most quarters. The income tax benefit resulted from higher net losses in 2009 due to higher cost of revenue expenses. We are able to carry back the increase in the 2009 loss to recover more prior year tax payments. Out of the total adjustment, a $2.9 million adjustment to cost of revenues net of $0.5 million income tax benefit was related to fiscal 2009. Management and the Audit Committee believe that such amounts are not material to current and previously reported financial statements.