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Component: (Network and Table)
Network
2402410 - Disclosure - Summary of Significant Accounting Policies - Warranty Obligations (Details)
(http://www.formfactor.com/role/SummaryOfSignificantAccountingPoliciesWarrantyObligationsDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001039399 (http://www.sec.gov/CIK)
Accounting Policies [Abstract]Period [Axis]
2015-12-27 - 2016-12-31
2014-12-28 - 2015-12-26
Accounting Policies [Abstract]
 
 
Movement in Standard Product Warranty Accrual [Roll Forward]
 
 
Warranty Accrual beginning balance
1,116,000  
1,592,000  
Warranty reserve from acquisition-Cascade Microtech
795,000  
0  
Accruals
5,254,000  
2,536,000  
Settlements
(4,193,000) 
(3,012,000) 
Warranty Accrual ending balance
2,972,000  
 
1,116,000