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Note 4 - Long-Term Debt (Details) (USD $)		0 Months Ended								1 Months Ended
	Oct. 03, 2014 Subsequent Event [Member] Term Loan [Member] Syndication Facility Agreement [Member]	Oct. 17, 2014 Subsequent Event [Member] Seven Point Six Two Five Percentage Senior Notes [Member]	Oct. 10, 2014 Subsequent Event [Member] Seven Point Six Two Five Percentage Senior Notes [Member]	Oct. 17, 2014 Subsequent Event [Member] Seven Point Six Two Five Percentage Senior Notes [Member]	Oct. 10, 2014 Subsequent Event [Member] Seven Point Six Two Five Percentage Senior Notes [Member]	Oct. 03, 2014 Subsequent Event [Member] Syndication Facility Agreement [Member]	Oct. 02, 2014 Subsequent Event [Member] Syndication Facility Agreement [Member]	Sep. 28, 2014 Seven Point Six Two Five Percentage Senior Notes [Member]	Sep. 29, 2013 Seven Point Six Two Five Percentage Senior Notes [Member]	Nov. 30, 2013 11.375% Senior Secured Notes [Member]	Sep. 29, 2013 11.375% Senior Secured Notes [Member]	Sep. 28, 2014 Syndication Facility Agreement [Member]	Oct. 22, 2013 Syndication Facility Agreement [Member]	Sep. 28, 2014 Foreign Line of Credit [Member]
Note 4 - Long-Term Debt (Details) [Line Items]
Long-term Debt, Gross								$ 247,500,000	$ 275,000,000		$ 8,100,000
Debt Instrument, Interest Rate, Stated Percentage								7.625%	7.625%		11.375%
Long-term Debt, Fair Value								257,400,000	298,400,000
Debt Instrument, Repurchased Face Amount				220,000,000	27,500,000
Debt Instrument, Redemption Price, Percentage		103.813%	103.00%
Debt Instrument, Fair Value Disclosure											8,100,000
Repayments of Long-term Debt										8,100,000
Line of Credit Facility, Maximum Borrowing Capacity						250,000,000	200,000,000						200,000,000	8,400,000
Long-term Line of Credit												28,000,000		0
Debt, Weighted Average Interest Rate												4.50%
Letters of Credit Outstanding, Amount												3,300,000
Line of Credit Facility, Remaining Borrowing Capacity												168,700,000
Debt Instrument, Maximum Borrowing Capacity	200,000,000
Debt Instrument, Option to Increase Maximum Borrowing Capacity, Amount						150,000,000
Line of Credit Facility, Option to Increase Maximum Borrowing Capacity, Amount						$ 150,000,000

X

- Definition

Maximum borrowing capacity under the long-term financing arrangement without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the arrangement.

+ References

No definition available.

+ Details

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X

- Definition

The amount of which the reporting entity has the option to increase the maximum borrowing capacity under the long-term financing arrangement without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	tile_
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Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of which the reporting entity has the option to increase the maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	tile_
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X

- Details

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X

- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-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)

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



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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X

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611

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Balance Type:	credit
Period Type:	instant

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

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X

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph e

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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X

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

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-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Period Type:	instant

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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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.

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X

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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