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Note 19 - Quarterly Data and Share Information (Unaudited) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 28, 2014 | Sep. 28, 2014 | Dec. 29, 2013 | Dec. 28, 2014 | Dec. 29, 2013 | Dec. 30, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |
Restructuring Costs and Asset Impairment Charges |  | $ 12,400,000 us-gaap_RestructuringCostsAndAssetImpairmentCharges |  |  |  |
| 12,000,000 tile_DebtRetirementExpense |  | 1,700,000 tile_DebtRetirementExpense | 11,989,000 tile_DebtRetirementExpense | 1,667,000 tile_DebtRetirementExpense | 0 tile_DebtRetirementExpense
|  |  | $ 7,000,000 tile_FireRelatedGainLoss | $ 0 tile_FireRelatedGainLoss | $ 6,954,000 tile_FireRelatedGainLoss | $ (1,748,000)tile_FireRelatedGainLoss

X
- Definition Expenses related to the retirement of debt. + References No definition available. + Details
Name: | tile_DebtRetirementExpense
Namespace Prefix: | tile_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gain (loss) related to a fire. + References No definition available. + Details
Name: | tile_FireRelatedGainLoss
Namespace Prefix: | tile_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_QuarterlyFinancialInformationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_RestructuringCostsAndAssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration