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Note 10 - Derivative Instruments (Details Textual) $ in Millions | Dec. 30, 2018 USD ($)
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Interest Rate Swap [Member] |
Derivative, Notional Amount | $ 100.0
Foreign Exchange Forward [Member] |
Derivative, Notional Amount | $ 36.0
Derivative, Percentage of Expected Inter-company Sales Between European and US Subsidiary | 70.00%

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the percentage of expected inter-company sales between European manufacturing facility and US subsidiary covered by derivative contracts. + References No definition available. + Details
Name: | tile_DerivativePercentageOfExpectedInterCompanySalesBetweenEuropeanAndUsSubsidiary
Namespace Prefix: | tile_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |