XML 78 R66.htm IDEA: XBRL DOCUMENT
v3.25.2

Operating Segments and Enterprise-Wide Information - Revenue by Segment, Recognition Type, and Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2025 | Jun. 29, 2024 | Jun. 28, 2025 | Jun. 29, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 195,798 | $ 197,474 | $ 367,154 | $ 366,199
Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 162,108 | 166,792 | 298,628 | 303,493
Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 33,690 | 30,682 | 68,526 | 62,706
Taiwan |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 52,879 | 44,813 | 98,241 | 74,690
Taiwan | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 46,814 | 40,192 | 87,561 | 67,371
Taiwan | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,065 | 4,621 | 10,680 | 7,319
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 40,924 | 47,891 | 81,249 | 93,657
United States | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 32,849 | 39,435 | 60,633 | 75,031
United States | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 8,075 | 8,456 | 20,616 | 18,626
China |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9,400 | 25,087 | 23,015 | 40,700
China | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,633 | 20,311 | 12,785 | 28,997
China | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,767 | 4,776 | 10,230 | 11,703
South Korea |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 57,129 | 49,107 | 100,300 | 99,824
South Korea | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 55,836 | 48,691 | 98,045 | 99,363
South Korea | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,293 | 416 | 2,255 | 461
Malaysia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,155 | 6,602 | 7,755 | 8,465
Malaysia | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,112 | 5,084 | 7,664 | 6,692
Malaysia | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 43 | 1,518 | 91 | 1,773
Japan |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 14,666 | 7,611 | 24,985 | 16,153
Japan | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,080 | 4,513 | 12,259 | 8,860
Japan | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,586 | 3,098 | 12,726 | 7,293
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,248 | 8,815 | 15,029 | 17,664
Europe | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,224 | 3,250 | 6,759 | 6,778
Europe | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,024 | 5,565 | 8,270 | 10,886
Singapore |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,679 | 4,522 | 12,928 | 9,280
Singapore | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,489 | 4,112 | 10,360 | 7,628
Singapore | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,190 | 410 | 2,568 | 1,652
Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,718 | 3,026 | 3,652 | 5,766
Rest of World | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,071 | 1,204 | 2,562 | 2,773
Rest of World | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 647 | 1,822 | 1,090 | 2,993
Products transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 190,795 | 193,621 | 356,851 | 358,046
Products transferred at a point in time | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 160,552 | 165,492 | 295,273 | 301,133
Products transferred at a point in time | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 30,243 | 28,129 | 61,578 | 56,913
Products and services transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,003 | 3,853 | 10,303 | 8,153
Products and services transferred over time | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,556 | 1,300 | 3,355 | 2,360
Products and services transferred over time | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,447 | 2,553 | 6,948 | 5,793
Foundry & Logic |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 99,513 | 103,660 | 184,785 | 190,428
Foundry & Logic | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 99,513 | 103,660 | 184,785 | 190,428
Foundry & Logic | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
DRAM |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 57,057 | 58,042 | 105,915 | 103,938
DRAM | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 57,057 | 58,042 | 105,915 | 103,938
DRAM | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Flash |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,538 | 5,090 | 7,928 | 9,127
Flash | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,538 | 5,090 | 7,928 | 9,127
Flash | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 33,690 | 30,682 | 68,526 | 62,706
Systems | Probe Cards |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Systems | Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 33,690 | $ 30,682 | $ 68,526 | $ 62,706

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 9: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 + Details
Name: | us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-4 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147476153/220-40-55-14 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-7 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 8: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 9: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479941/924-10-S99-1 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-40 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-4 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=form_ProbeCardsSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=form_SystemsSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_TW
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_CN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_KR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_MY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_JP
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_EuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_SG
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=form_RestOfTheWorldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TimingOfTransferOfGoodOrServiceAxis=us-gaap_TransferredAtPointInTimeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TimingOfTransferOfGoodOrServiceAxis=us-gaap_TransferredOverTimeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=form_FoundryLogicProductGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=form_DRAMProductGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=form_FlashProductGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=form_SystemsProductGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |