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Note 13 - Taxes on Income (Details) (USD $)
 12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Jan. 01, 2012
Note 13 - Taxes on Income (Details) [Line Items]        
Deferred Tax Assets, Operating Loss Carryforwards, Foreign $ 4,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign      
Operating Loss Carryforwards, Valuation Allowance 10,298,000us-gaap_OperatingLossCarryforwardsValuationAllowance 9,577,000us-gaap_OperatingLossCarryforwardsValuationAllowance    
Unrecognized Tax Benefits, Period Increase (Decrease) (21,800,000)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease (21,800,000)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease    
Effective Income Tax Rate Reconciliation, Percent 30.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 30.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 39.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate      
Undistributed Earnings of Foreign Subsidiaries 261,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries      
Deferred Tax Liabilities, Undistributed Foreign Earnings 5,600,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings      
Foreign Earnings to be Repatriated 2,400,000tile_ForeignEarningsToBeRepatriated      
Unrecognized Tax Benefits 27,301,000us-gaap_UnrecognizedTaxBenefits 27,361,000us-gaap_UnrecognizedTaxBenefits 25,186,000us-gaap_UnrecognizedTaxBenefits 7,736,000us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 27,300,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate      
Unrecognized Tax Benefits That Would Require To Settle Through Cash 5,500,000tile_UnrecognizedTaxBenefitsThatWouldRequireToSettleThroughCash      
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued (1,200,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued      
Income Tax Expense (Benefit) 10,934,000us-gaap_IncomeTaxExpenseBenefit 20,749,000us-gaap_IncomeTaxExpenseBenefit 15,204,000us-gaap_IncomeTaxExpenseBenefit  
Earliest Tax Year [Member] | Domestic Tax Authority [Member]        
Note 13 - Taxes on Income (Details) [Line Items]        
Open Tax Year 2003      
Earliest Tax Year [Member] | State and Local Jurisdiction [Member]        
Note 13 - Taxes on Income (Details) [Line Items]        
Open Tax Year 2009      
Earliest Tax Year [Member] | Foreign Tax Authority [Member]        
Note 13 - Taxes on Income (Details) [Line Items]        
Open Tax Year 2004      
Deferred Compensation, Share-based Payments [Member] | Domestic Tax Authority [Member]        
Note 13 - Taxes on Income (Details) [Line Items]        
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 28,900,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember		      
Domestic Tax Authority [Member]        
Note 13 - Taxes on Income (Details) [Line Items]        
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 129,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		      
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries 800,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		      
State and Local Jurisdiction [Member] | Continuing Operations [Member]        
Note 13 - Taxes on Income (Details) [Line Items]        
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 209,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		      
State and Local Jurisdiction [Member]        
Note 13 - Taxes on Income (Details) [Line Items]        
Operating Loss Carryforwards, Valuation Allowance 163,700,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		      
Foreign Tax Authority [Member]        
Note 13 - Taxes on Income (Details) [Line Items]        
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries 100,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		      
BAPA Program [Member]        
Note 13 - Taxes on Income (Details) [Line Items]        
Income Tax Expense (Benefit)   (1,900,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= tile_BAPAProgramMember		    
Canadian Subsidiary [Member]        
Note 13 - Taxes on Income (Details) [Line Items]        
Increase (Decrease) in Income Taxes Payable   (600,000)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
/ us-gaap_SubsegmentsAxis
= tile_CanadianSubsidiaryMember		    
Continuing Operations [Member]        
Note 13 - Taxes on Income (Details) [Line Items]        
Income Tax Expense (Benefit) 10,934,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 20,749,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 15,204,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		  
Discontinued Operations [Member]        
Note 13 - Taxes on Income (Details) [Line Items]        
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 166,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember		      
Income Tax Expense (Benefit) $ 0us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember		 $ 0us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember		 $ (9,164,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember