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Note 13 - Taxes on Income (Details) - Income Tax Expense (Benefit) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 28, 2014 | Dec. 29, 2013 | Dec. 30, 2012
Note 13 - Taxes on Income (Details) - Income Tax Expense (Benefit) [Line Items] |  |  |
Income tax expense (benefit) | $ 10,934 us-gaap_IncomeTaxExpenseBenefit | $ 20,749 us-gaap_IncomeTaxExpenseBenefit | $ 15,204 us-gaap_IncomeTaxExpenseBenefit
Continuing Operations [Member] |  |  |
Note 13 - Taxes on Income (Details) - Income Tax Expense (Benefit) [Line Items] |  |  |
Income tax expense (benefit) | 10,934 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 20,749 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 15,204 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Discontinued Operations [Member] |  |  |
Note 13 - Taxes on Income (Details) - Income Tax Expense (Benefit) [Line Items] |  |  |
Income tax expense (benefit) | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember | (9,164)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Continuing and Discontinued Operations [Member] |  |  |
Note 13 - Taxes on Income (Details) - Income Tax Expense (Benefit) [Line Items] |  |  |
Income tax expense (benefit) | $ 10,934 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementOperatingActivitiesSegmentAxis = tile_ContinuingAndDiscontinuedOperationsMember | $ 20,749 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementOperatingActivitiesSegmentAxis = tile_ContinuingAndDiscontinuedOperationsMember | $ 6,040 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementOperatingActivitiesSegmentAxis = tile_ContinuingAndDiscontinuedOperationsMember

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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