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Note 4 - Fair Value of Financial Instruments (Details) (USD $) In Millions, unless otherwise specified | Dec. 28, 2014 | Dec. 29, 2013
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Note 4 - Fair Value of Financial Instruments (Details) [Line Items] |  |
Company-owned Life Insurance Assets, Fair Value Disclosure | 24.1 tile_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 |  | $ 265.8 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = tile_SeniorNotes7625Member

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- Definition The fair value disclosure of company-owned life insurance assets. + References No definition available. + Details
Name: | tile_CompanyOwnedLifeInsuranceAssetsFairValueDisclosure
Namespace Prefix: | tile_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | tile_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |