Property, Plant and Equipment - Narrative (Details) $ in Millions	Dec. 29, 2019 USD ($)
Property, Plant and Equipment [Abstract]
Estimated cost to complete construction-in-progress	$ 57.2

Estimated Cost To Complete Approved Projects And Current Construction In Progress

No definition available.

Name:	tile_EstimatedCostToCompleteApprovedProjectsAndCurrentConstructionInProgress
Namespace Prefix:	tile_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant