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Note 17 - Fire at Australian Manufacturing Facility (Details) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended		24 Months Ended
	Dec. 29, 2013	Sep. 29, 2013	Dec. 29, 2013	Dec. 30, 2012	Dec. 29, 2013	Dec. 28, 2014
Note 17 - Fire at Australian Manufacturing Facility (Details) [Line Items]
Asset Impairment Charges			$ 2,700,000us-gaap_AssetImpairmentCharges	$ 22,300,000us-gaap_AssetImpairmentCharges	$ 69,700,000us-gaap_AssetImpairmentCharges
Excess Production Cost Due To Fire			23,400,000tile_ExcessProductionCostDueToFire	21,300,000tile_ExcessProductionCostDueToFire
Insurance Recoveries	22,300,000us-gaap_InsuranceRecoveries	33,700,000us-gaap_InsuranceRecoveries		20,700,000us-gaap_InsuranceRecoveries	76,700,000us-gaap_InsuranceRecoveries
Prepaid Expense and Other Assets, Current	23,411,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent		23,411,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent		23,411,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent	20,780,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Gain on Business Interruption Insurance Recovery			7,000,000us-gaap_GainOnBusinessInterruptionInsuranceRecovery
Insurance Claims [Member]
Note 17 - Fire at Australian Manufacturing Facility (Details) [Line Items]
Prepaid Expense and Other Assets, Current				22,900,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_InsuranceClaimsMember
Non-Production Related [Member]
Note 17 - Fire at Australian Manufacturing Facility (Details) [Line Items]
Loss from Catastrophes				$ 1,700,000us-gaap_LossFromCatastrophes / us-gaap_StatementOperatingActivitiesSegmentAxis = tile_NonProductionRelatedMember

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

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The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire.

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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The charge against earnings in the period for the uninsured portion of a loss from a fire, explosion, or natural disaster (hurricane, earthquake).

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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-Publisher SEC

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