{"cik":1039399,"taxonomy":"us-gaap","tag":"LongTermDebtNoncurrent","label":"Long-term Debt, Excluding Current Maturities","description":"Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","entityName":"FormFactor, Inc.","units":{"USD":[{"end":"2015-12-26","val":0,"accn":"0001039399-16-000065","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"end":"2015-12-26","val":0,"accn":"0001039399-16-000070","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-03","frame":"CY2015Q4I"},{"end":"2016-06-25","val":141417000,"accn":"0001039399-16-000065","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04","frame":"CY2016Q2I"},{"end":"2016-09-24","val":137777000,"accn":"0001039399-16-000070","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-03","frame":"CY2016Q3I"},{"end":"2016-12-31","val":125475000,"accn":"0001039399-17-000026","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-10"},{"end":"2016-12-31","val":125475000,"accn":"0001039399-17-000067","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10"},{"end":"2016-12-31","val":125475000,"accn":"0001039399-17-000078","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-07"},{"end":"2016-12-31","val":125475000,"accn":"0001039399-18-000014","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27","frame":"CY2016Q4I"},{"end":"2017-04-01","val":116872000,"accn":"0001039399-17-000026","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-10","frame":"CY2017Q1I"},{"end":"2017-07-01","val":104506000,"accn":"0001039399-17-000067","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-10","frame":"CY2017Q2I"},{"end":"2017-09-30","val":92123000,"accn":"0001039399-17-000078","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-07","frame":"CY2017Q3I"},{"end":"2017-12-30","val":87228000,"accn":"0001039399-18-000014","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-27"},{"end":"2017-12-30","val":87228000,"accn":"0001039399-18-000028","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08"},{"end":"2017-12-30","val":87228000,"accn":"0001039399-18-000072","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-07"},{"end":"2017-12-30","val":87228000,"accn":"0001039399-18-000085","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-06"},{"end":"2017-12-30","val":87228000,"accn":"0001039399-19-000010","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-26","frame":"CY2017Q4I"},{"end":"2018-03-31","val":67315000,"accn":"0001039399-18-000028","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08","frame":"CY2018Q1I"},{"end":"2018-06-30","val":51137000,"accn":"0001039399-18-000072","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-07","frame":"CY2018Q2I"},{"end":"2018-09-29","val":46193000,"accn":"0001039399-18-000085","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-06","frame":"CY2018Q3I"},{"end":"2018-12-29","val":34971000,"accn":"0001039399-19-000010","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-26"},{"end":"2018-12-29","val":34971000,"accn":"0001039399-19-000024","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-07"},{"end":"2018-12-29","val":34971000,"accn":"0001039399-19-000062","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-06"},{"end":"2018-12-29","val":34971000,"accn":"0001039399-19-000083","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-05"},{"end":"2018-12-29","val":34971000,"accn":"0001039399-20-000011","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-21","frame":"CY2018Q4I"},{"end":"2019-03-30","val":23740000,"accn":"0001039399-19-000024","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-07","frame":"CY2019Q1I"},{"end":"2019-06-29","val":12500000,"accn":"0001039399-19-000062","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-06","frame":"CY2019Q2I"},{"end":"2019-09-28","val":0,"accn":"0001039399-19-000083","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-05","frame":"CY2019Q3I"},{"end":"2019-12-28","val":15639000,"accn":"0001039399-20-000011","fy":2019,"fp":"FY","form":"10-K","filed":"2020-02-21"},{"end":"2019-12-28","val":15639000,"accn":"0001039399-20-000026","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-07"},{"end":"2019-12-28","val":15639000,"accn":"0001039399-20-000073","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-04"},{"end":"2019-12-28","val":15639000,"accn":"0001039399-20-000089","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-03"},{"end":"2019-12-28","val":15639000,"accn":"0001039399-21-000009","fy":2020,"fp":"FY","form":"10-K","filed":"2021-02-22","frame":"CY2019Q4I"},{"end":"2020-03-28","val":13642000,"accn":"0001039399-20-000026","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-07","frame":"CY2020Q1I"},{"end":"2020-06-27","val":28725000,"accn":"0001039399-20-000073","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-04","frame":"CY2020Q2I"},{"end":"2020-09-26","val":26874000,"accn":"0001039399-20-000089","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-03","frame":"CY2020Q3I"},{"end":"2020-12-26","val":24978000,"accn":"0001039399-21-000009","fy":2020,"fp":"FY","form":"10-K","filed":"2021-02-22"},{"end":"2020-12-26","val":24978000,"accn":"0001039399-21-000022","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-04"},{"end":"2020-12-26","val":24978000,"accn":"0001039399-21-000064","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-07-30"},{"end":"2020-12-26","val":24978000,"accn":"0001039399-21-000085","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-02"},{"end":"2020-12-26","val":24978000,"accn":"0001039399-22-000014","fy":2021,"fp":"FY","form":"10-K","filed":"2022-02-18","frame":"CY2020Q4I"},{"end":"2021-03-27","val":22390000,"accn":"0001039399-21-000022","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-04","frame":"CY2021Q1I"},{"end":"2021-06-26","val":20123000,"accn":"0001039399-21-000064","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-07-30","frame":"CY2021Q2I"},{"end":"2021-09-25","val":17742000,"accn":"0001039399-21-000085","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-02","frame":"CY2021Q3I"},{"end":"2021-12-25","val":15434000,"accn":"0001039399-22-000014","fy":2021,"fp":"FY","form":"10-K","filed":"2022-02-18"},{"end":"2021-12-25","val":15434000,"accn":"0001039399-22-000020","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-05-03"},{"end":"2021-12-25","val":15434000,"accn":"0001039399-22-000076","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-02"},{"end":"2021-12-25","val":15434000,"accn":"0001039399-22-000099","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-01"},{"end":"2021-12-25","val":15434000,"accn":"0001039399-23-000010","fy":2022,"fp":"FY","form":"10-K","filed":"2023-02-24","frame":"CY2021Q4I"},{"end":"2022-03-26","val":15175000,"accn":"0001039399-22-000020","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-05-03","frame":"CY2022Q1I"},{"end":"2022-06-25","val":14915000,"accn":"0001039399-22-000076","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-02","frame":"CY2022Q2I"},{"end":"2022-09-24","val":14653000,"accn":"0001039399-22-000099","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-01","frame":"CY2022Q3I"},{"end":"2022-12-31","val":14389000,"accn":"0001039399-23-000010","fy":2022,"fp":"FY","form":"10-K","filed":"2023-02-24"},{"end":"2022-12-31","val":14389000,"accn":"0001039399-23-000019","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-09"},{"end":"2022-12-31","val":14389000,"accn":"0001039399-23-000036","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-08"},{"end":"2022-12-31","val":14389000,"accn":"0001039399-23-000049","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-07"},{"end":"2022-12-31","val":14389000,"accn":"0001039399-24-000007","fy":2023,"fp":"FY","form":"10-K","filed":"2024-02-23","frame":"CY2022Q4I"},{"end":"2023-04-01","val":14034000,"accn":"0001039399-23-000019","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-09","frame":"CY2023Q1I"},{"end":"2023-07-01","val":13765000,"accn":"0001039399-23-000036","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-08","frame":"CY2023Q2I"},{"end":"2023-09-30","val":13586000,"accn":"0001039399-23-000049","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-07","frame":"CY2023Q3I"},{"end":"2023-12-30","val":13314000,"accn":"0001039399-24-000007","fy":2023,"fp":"FY","form":"10-K","filed":"2024-02-23"},{"end":"2023-12-30","val":13314000,"accn":"0001039399-24-000016","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-07"},{"end":"2023-12-30","val":13314000,"accn":"0001039399-24-000028","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-07"},{"end":"2023-12-30","val":13314000,"accn":"0001039399-24-000035","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-05"},{"end":"2023-12-30","val":13314000,"accn":"0001039399-25-000023","fy":2024,"fp":"FY","form":"10-K","filed":"2025-02-21","frame":"CY2023Q4I"},{"end":"2024-03-30","val":13041000,"accn":"0001039399-24-000016","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-07","frame":"CY2024Q1I"},{"end":"2024-06-29","val":12765000,"accn":"0001039399-24-000028","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-07","frame":"CY2024Q2I"},{"end":"2024-09-28","val":12488000,"accn":"0001039399-24-000035","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-05","frame":"CY2024Q3I"},{"end":"2024-12-28","val":12208000,"accn":"0001039399-25-000023","fy":2024,"fp":"FY","form":"10-K","filed":"2025-02-21"},{"end":"2024-12-28","val":12208000,"accn":"0001039399-25-000038","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-06"},{"end":"2024-12-28","val":12208000,"accn":"0001039399-25-000083","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-05"},{"end":"2024-12-28","val":12208000,"accn":"0001039399-25-000113","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-04"},{"end":"2024-12-28","val":12208000,"accn":"0001039399-26-000009","fy":2025,"fp":"FY","form":"10-K","filed":"2026-02-20","frame":"CY2024Q4I"},{"end":"2025-03-29","val":11927000,"accn":"0001039399-25-000038","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-06","frame":"CY2025Q1I"},{"end":"2025-06-28","val":11644000,"accn":"0001039399-25-000083","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-05","frame":"CY2025Q2I"},{"end":"2025-09-27","val":11359000,"accn":"0001039399-25-000113","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-04","frame":"CY2025Q3I"},{"end":"2025-12-27","val":11071000,"accn":"0001039399-26-000009","fy":2025,"fp":"FY","form":"10-K","filed":"2026-02-20"},{"end":"2025-12-27","val":11071000,"accn":"0001039399-26-000023","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-05"},{"end":"2025-12-27","val":11071000,"accn":"0001039399-26-000033","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-04","frame":"CY2025Q4I"},{"end":"2026-03-28","val":10782000,"accn":"0001039399-26-000023","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-05","frame":"CY2026Q1I"},{"end":"2026-06-27","val":10491000,"accn":"0001039399-26-000033","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-04","frame":"CY2026Q2I"}]}}