XML 70 R52.htm IDEA: XBRL DOCUMENT
v3.25.4

Summary of Significant Accounting Policies - Government Assistance (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2023 | Dec. 27, 2025 | Dec. 28, 2024
Accounting Policies [Abstract] |  |  |
Deferred grant | $ 18,000 | $ 18,000 | $ 18,000
Deferred Government Grant Liability, Term | 5 years |  |
Estimated credit, decrease to PPE cost, location |  | Property, plant and equipment, net of accumulated depreciation | Property, plant and equipment, net of accumulated depreciation
Estimated credit, decrease to PPE cost |  | $ 8,700 | $ 7,300

X
- Definition Deferred Government Grant Liability + References No definition available. + Details
Name: | form_DeferredGovernmentGrantLiability
Namespace Prefix: | form_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Deferred Government Grant Liability, Term + References No definition available. + Details
Name: | form_DeferredGovernmentGrantLiabilityTerm
Namespace Prefix: | form_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of decrease in asset from government assistance, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 832 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483507/832-10-50-3 + Details
Name: | us-gaap_GovernmentAssistanceAssetDecreaseNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Indicates line item in statement of financial position that includes decrease in asset from government assistance, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 832 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483507/832-10-50-3 + Details
Name: | us-gaap_GovernmentAssistanceAssetDecreaseNoncurrentStatementOfFinancialPositionExtensibleEnumeration
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | duration