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

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- Definition

The number of positions eliminated during the period as a result of restructuring activities.

+ References

No definition available.

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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

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