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Note 6 - Property and Equipment (Details) (USD $) In Millions, unless otherwise specified	Dec. 29, 2013
Property, Plant and Equipment [Abstract]
Estimated Cost To Complete Approved Projects And Current Construction In Progress	$ 24.9

X

- Definition

Estimated Cost To Complete Approved Projects And Current 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