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Leases - Narrative (Details)	3 Months Ended
	Apr. 04, 2021
Lessee, Lease, Description [Line Items]
Lease renewal term	5 years
Minimum
Lessee, Lease, Description [Line Items]
Lease contract term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease contract term	20 years

X

- Definition

Term of lessee's operating and finance leases renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	tile_LesseeLeaseRenewalTerm
Namespace Prefix:	tile_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of lessee's operating and finance leases, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	tile_LesseeLeaseTermOfContract
Namespace Prefix:	tile_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: