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Note 4 - Fair Value of Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Dec. 29, 2013
Note 4 - Fair Value of Financial Instruments (Details) [Line Items]
Company Owned Life Insurance Assets Fair Value Disclosure	$ 23.2
Seven Point Six Two Five Percentage Senior Notes [Member]
Note 4 - Fair Value of Financial Instruments (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.625%
Long-term Debt, Fair Value	$ 265.8

X

- Definition

Company Owned Life Insurance Assets Fair Value Disclosure

+ References

No definition available.

+ Details

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

X

- Details

Name:	tile_Note4FairValueofFinancialInstrumentsDetailsLineItems
Namespace Prefix:	tile_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant