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Note 16 - Employee Benefit Plans (Details) - Future Benefit Payments for SCP (Domestic SCP [Member], USD $)
In Thousands, unless otherwise specified
Dec. 28, 2014
Domestic SCP [Member]
 
Note 16 - Employee Benefit Plans (Details) - Future Benefit Payments for SCP [Line Items]  
2015 $ 847us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= tile_DomesticSCPMember
2016 847us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= tile_DomesticSCPMember
2017 847us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= tile_DomesticSCPMember
2018 847us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= tile_DomesticSCPMember
2019 847us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= tile_DomesticSCPMember
2020-2024 $ 9,504us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= tile_DomesticSCPMember