XML 57 R48.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Restructuring Charges - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 24, 2022 USD ($) | Sep. 24, 2022 USD ($)
Restructuring Cost and Reserve [Line Items] |  |
Restructuring incurred cost |  | $ 11.2
Employee Severance and Benefits |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring incurred cost |  | 1.2
Contract Termination Costs |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring incurred cost |  | 1.5
Inventory Impairments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring incurred cost | $ 5.9 | 8.0
Other Costs |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring incurred cost |  | 0.6
Minimum |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expected cost | 10.5 | 10.5
Minimum | Probe Cards |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expected cost | 8.7 | 8.7
Minimum | Systems |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expected cost | 1.8 | 1.8
Minimum | Employee Severance and Benefits |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expected cost | 1.0 | 1.0
Minimum | Contract Termination Costs |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expected cost | 1.5 | 1.5
Minimum | Inventory Impairments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expected cost | 7.5 | 7.5
Minimum | Other Costs |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expected cost | 0.5 | 0.5
Maximum |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expected cost | 12.6 | 12.6
Maximum | Probe Cards |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expected cost | 9.7 | 9.7
Maximum | Systems |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expected cost | 2.9 | 2.9
Maximum | Employee Severance and Benefits |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expected cost | 1.2 | 1.2
Maximum | Contract Termination Costs |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expected cost | 1.9 | 1.9
Maximum | Inventory Impairments |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expected cost | 8.5 | 8.5
Maximum | Other Costs |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expected cost | $ 1.0 | $ 1.0

X
- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(d)) -URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
Name: | us-gaap_RestructuringAndRelatedCostExpectedCost1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(d)) -URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
Name: | us-gaap_RestructuringAndRelatedCostIncurredCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_ContractTerminationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=form_InventoryImpairmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_OtherRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |