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Note 12 - Restructuring Charges (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Sep. 28, 2014 | Dec. 28, 2014
Employee Severance [Member] | Restructuring Charge 2014 [Member] |  |
Note 12 - Restructuring Charges (Details) [Line Items] |  |
Restructuring Charges | $ 9,700,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = tile_RestructuringCharge2014Member | $ 9,669,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = tile_RestructuringCharge2014Member
Other Restructuring [Member] | Restructuring Charge 2014 [Member] |  |
Note 12 - Restructuring Charges (Details) [Line Items] |  |
Restructuring Charges |  | 133,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_RestructuringPlanAxis = tile_RestructuringCharge2014Member
Other Restructuring [Member] | Restructuring Charge 2012 [Member] |  |
Note 12 - Restructuring Charges (Details) [Line Items] |  |
Restructuring Charges | 100,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember / us-gaap_RestructuringPlanAxis = tile_RestructuringCharge2012Member |
Fixed Asset Impairment [Member] | Restructuring Charge 2014 [Member] |  |
Note 12 - Restructuring Charges (Details) [Line Items] |  |
Restructuring Charges | 2,600,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = tile_FixedAssetImpairmentMember / us-gaap_RestructuringPlanAxis = tile_RestructuringCharge2014Member | 2,584,000 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = tile_FixedAssetImpairmentMember / us-gaap_RestructuringPlanAxis = tile_RestructuringCharge2014Member
Restructuring Charge 2014 [Member] |  |
Note 12 - Restructuring Charges (Details) [Line Items] |  |
Restructuring Charges | 12,400,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = tile_RestructuringCharge2014Member |
Restructuring and Related Cost, Number of Positions Eliminated | 100 us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_RestructuringPlanAxis = tile_RestructuringCharge2014Member |
Effect on Future Cash Flows, Amount | $ 10,000,000 us-gaap_EffectOnFutureCashFlowsAmount / us-gaap_RestructuringPlanAxis = tile_RestructuringCharge2014Member |

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- Definition The quantified amount of the future effect on cash flows. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition The number of positions eliminated during the period as a result of restructuring activities. + References No definition available. + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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