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Note 18 - Quarterly Data and Share Information (Unaudited) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 28, 2014 | Sep. 28, 2014 | Jan. 03, 2016 | Dec. 28, 2014 | Dec. 29, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |
Restructuring Costs and Asset Impairment Charges |  | $ 12,400 |  |  |
Debt Retirement Expense | $ 12,000 |  | $ 0 | $ 11,989 | $ 1,667

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
- References No definition available. + Details
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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=56944662&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration