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Note 4 - Fair Value of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 28, 2014
Dec. 29, 2013
Note 4 - Fair Value of Financial Instruments (Details) [Line Items]    
Company-owned Life Insurance Assets, Fair Value Disclosure 24.1tile_CompanyOwnedLifeInsuranceAssetsFairValueDisclosure  
7.625% Senior Notes [Member]    
Note 4 - Fair Value of Financial Instruments (Details) [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= tile_SeniorNotes7625Member		  
Long-term Debt, Fair Value   $ 265.8us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= tile_SeniorNotes7625Member