Insider Trading Arrangements	3 Months Ended
Jul. 05, 2026 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Daniel T. Hendrix [Member]
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	June 3, 2026
Arrangement Duration	268 days
Aggregate Available	24,196
Laurel M. Hurd [Member]
Trading Arrangements, by Individual
Title	Director, Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	May 12, 2026
Arrangement Duration	450 days
Aggregate Available	84,000
David B. Foshee [Member]
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	June 5, 2026
Arrangement Duration	270 days
Aggregate Available	28,451
Daniel T. Hendrix [Member]
Trading Arrangements, by Individual
Name	Daniel T. Hendrix
Title	Director
Laurel M. Hurd [Member]
Trading Arrangements, by Individual
Name	Laurel M. Hurd
David B. Foshee [Member]
Trading Arrangements, by Individual
Name	David B. Foshee
Title	Officer

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K
-Number 229
-Section 408
-Subsection a
-Paragraph 1

+ Details

Name:	ecd_NonRule10b51ArrAdoptedFlag
Namespace Prefix:	ecd_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K
-Number 229
-Section 408
-Subsection a
-Paragraph 1

+ Details

Name:	ecd_NonRule10b51ArrTrmntdFlag
Namespace Prefix:	ecd_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K
-Number 229
-Section 408
-Subsection a
-Paragraph 1

+ Details

Name:	ecd_Rule10b51ArrAdoptedFlag
Namespace Prefix:	ecd_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K
-Number 229
-Section 408
-Subsection a
-Paragraph 1

+ Details

Name:	ecd_Rule10b51ArrTrmntdFlag
Namespace Prefix:	ecd_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K
-Number 229
-Section 408
-Subsection a
-Paragraph 2
-Subparagraph A

+ Details

Name:	ecd_TradingArrByIndTable
Namespace Prefix:	ecd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K
-Number 229
-Section 408
-Subsection a
-Paragraph 2
-Subparagraph B

+ Details

Name:	ecd_TrdArrAdoptionDate
Namespace Prefix:	ecd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K
-Number 229
-Section 408
-Subsection a
-Paragraph 2
-Subparagraph C

+ Details

Name:	ecd_TrdArrDuration
Namespace Prefix:	ecd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K
-Number 229
-Section 408
-Subsection a
-Paragraph 2
-Subparagraph A

+ Details

Name:	ecd_TrdArrIndName
Namespace Prefix:	ecd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K
-Number 229
-Section 408
-Subsection a
-Paragraph 2
-Subparagraph A

+ Details

Name:	ecd_TrdArrIndTitle
Namespace Prefix:	ecd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K
-Number 229
-Section 408
-Subsection a
-Paragraph 2
-Subparagraph D

+ Details

Name:	ecd_TrdArrSecuritiesAggAvailAmt
Namespace Prefix:	ecd_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ecd_IndividualAxis=tile_DanielT.HendrixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ecd_IndividualAxis=tile_LaurelM.HurdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ecd_IndividualAxis=tile_DavidB.FosheeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ecd_TradingArrAxis=tile_DanielT.HendrixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ecd_TradingArrAxis=tile_LaurelM.HurdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ecd_TradingArrAxis=tile_DavidB.FosheeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: