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Note 6 - Property and Equipment (Details) (USD $) In Millions, unless otherwise specified	Dec. 28, 2014
Property, Plant and Equipment [Abstract]
Estimated Cost to Complete Approved Projects and Current Construction in Progress	$ 11.2tile_EstimatedCostToCompleteApprovedProjectsAndCurrentConstructionInProgress

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

- Details

Name:	us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration