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Note 6 - Property and Equipment (Details) $ in Millions | Jan. 03, 2016 USD ($)
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Property, Plant and Equipment [Abstract] |
Estimated Cost to Complete Approved Projects and Current Construction in Progress | $ 13.1

X
- Definition An estimate of the costs to complete approved projects and construction in progress. + References No definition available. + Details
Name: | tile_EstimatedCostToCompleteApprovedProjectsAndCurrentConstructionInProgress
Namespace Prefix: | tile_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration