The amount of the initial amortization payment that is due on the last calendar quarter.

No definition available.

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- 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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- Definition

The maximum consolidated net leverage ratio.

+ References

No definition available.

+ Details

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- Definition

The maximum percentage of first tier subsidiary stock pledged as collateral.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	instant

- Definition

The minimum consolidated interest coverage ratio.

+ References

No definition available.

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Namespace Prefix:	tile_
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- Definition

The quarterly amortization payment amount required after a certain number of the initial amortization payments.

+ References

No definition available.

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- Definition

The threshold of other indebtedness triggering default.

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No definition available.

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 5

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- Definition

Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- 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.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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Balance Type:	credit
Period Type:	instant

- Definition

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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

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Balance Type:	na
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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph e

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Percentage of principal amount of debt redeemed.

+ References

No definition available.

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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 3

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

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- 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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Balance Type:	credit
Period Type:	instant

- 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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

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-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

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

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Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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- Definition

The effective interest rate during the reporting period.

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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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Balance Type:	na
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- 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

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Balance Type:	credit
Period Type:	instant

- 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

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Balance Type:	credit
Period Type:	instant

- Definition

Weighted average interest rate of long-term debt outstanding.

+ References

No definition available.

+ Details

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

- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Balance Type:	debit
Period Type:	duration

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Balance Type:
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- Details

Name:	us-gaap_DebtInstrumentAxis=tile_SeniorNotes7625Member
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Name:	us-gaap_DebtInstrumentAxis=tile_SeniorSecured1138NotesMember
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Note 8 - Borrowings (Details) (USD $)	12 Months Ended			48 Months Ended	0 Months Ended	1 Months Ended
Note 8 - Borrowings (Details) (USD $)	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012	Dec. 01, 2014	Dec. 01, 2014	Nov. 26, 2014	Nov. 30, 2013	Dec. 03, 2010	Jun. 05, 2009
Note 8 - Borrowings (Details) [Line Items]
ThresholdOfOtherIndebtednessTriggeringDefault	$ 20,000,000
Repayments of Long-term Debt	247,500,000us-gaap_RepaymentsOfLongTermDebt	35,610,000us-gaap_RepaymentsOfLongTermDebt	11,477,000us-gaap_RepaymentsOfLongTermDebt
Deferred Finance Costs, Net	2,400,000us-gaap_DeferredFinanceCostsNet	5,000,000us-gaap_DeferredFinanceCostsNet
Amortization of Financing Costs and Discounts	3,800,000	2,000,000	1,200,000
Write off of Deferred Debt Issuance Cost	2,800,000	800,000
Debt Instrument, Redemption, Period One [Member] \| 7.625% Senior Notes [Member]
Note 8 - Borrowings (Details) [Line Items]
Debt Instrument, Redemption Price, Percentage				100.00%
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed				10.00%
Debt Instrument, Redemption, Period Two [Member] \| 7.625% Senior Notes [Member]
Note 8 - Borrowings (Details) [Line Items]
Debt Instrument, Redemption Price, Percentage	103.00%
Debt Instrument, Redemption, Period Three [Member] \| 7.625% Senior Notes [Member]
Note 8 - Borrowings (Details) [Line Items]
Debt Instrument, Redemption Price, Percentage	103.813%
Debt Instrument, Redemption, Period Four [Member] \| 7.625% Senior Notes [Member]
Note 8 - Borrowings (Details) [Line Items]
Debt Instrument, Redemption Price, Percentage	100.00%
Standby Letters of Credit [Member] \| Syndication Facility Agreement [Member]
Note 8 - Borrowings (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	40,000,000
Through and Including First Fiscal Quarter Ending December 28, 2014 [Member] \| Syndication Facility Agreement [Member]
Note 8 - Borrowings (Details) [Line Items]
Maximum Consolidated Net Leverage Ratio	4.50
From and Including First Fiscal Quarter Ending April 5, 2015 [Member] \| Syndication Facility Agreement [Member]
Note 8 - Borrowings (Details) [Line Items]
Maximum Consolidated Net Leverage Ratio	4.00
For Each Fiscal Quarter Thereafter [Member] \| Syndication Facility Agreement [Member]
Note 8 - Borrowings (Details) [Line Items]
Maximum Consolidated Net Leverage Ratio	3.75
7.625% Senior Notes [Member]
Note 8 - Borrowings (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.625%
Long-term Debt, Gross								275,000,000
Debt Instrument, Redemption Price, Percentage					103.813%	103.00%	103.00%
Repayments of Long-term Debt					220,000,000	27,500,000	27,500,000
Amortization of Debt Discount (Premium)					(9,300,000)
Long-term Debt, Fair Value		265,800,000
Term Loan A [Member] \| Syndication Facility Agreement [Member]
Note 8 - Borrowings (Details) [Line Items]
Long-term Line of Credit	200,000,000
Term Loan A [Member]
Note 8 - Borrowings (Details) [Line Items]
Initial Amortization Payment	2,500,000
Subsequent Amortization Payment	3,750,000
11.375% Senior Secured Notes [Member]
Note 8 - Borrowings (Details) [Line Items]
Long-term Debt, Gross			8,100,000						150,000,000
Repayments of Long-term Debt							8,100,000
Term Loan A [Member] \| Syndication Facility Agreement [Member]
Note 8 - Borrowings (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	200,000,000
Syndication Facility Agreement [Member] \| Base Rate [Member] \| Minimum [Member]
Note 8 - Borrowings (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.25%
Syndication Facility Agreement [Member] \| Base Rate [Member] \| Maximum [Member]
Note 8 - Borrowings (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Syndication Facility Agreement [Member] \| Federal Funds Rate [Member]
Note 8 - Borrowings (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Syndication Facility Agreement [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Note 8 - Borrowings (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Syndication Facility Agreement [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Note 8 - Borrowings (Details) [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Syndication Facility Agreement [Member] \| Minimum [Member]
Note 8 - Borrowings (Details) [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.20%
Syndication Facility Agreement [Member] \| Maximum [Member]
Note 8 - Borrowings (Details) [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.35%
Syndication Facility Agreement [Member] \| Europe and Australia[Member]
Note 8 - Borrowings (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	240,000,000
Syndication Facility Agreement [Member] \| THAILAND
Note 8 - Borrowings (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	10,000,000
Syndication Facility Agreement [Member]
Note 8 - Borrowings (Details) [Line Items]
Line of Credit Facility, Option to Increase Maximum Borrowing Capacity, Amount	150,000,000
MinimumConsolidatedInterestCoverageRatio	2.25
MaximumPercentageOfFirstTierSubsidiaryStockPledgedAsCollateral	65.00%
Letters of Credit Outstanding, Amount	3,300,000
Long-term Debt, Weighted Average Interest Rate	2.20%
Revolving Credit Facility [Member]
Note 8 - Borrowings (Details) [Line Items]
Long-term Line of Credit	63,300,000
Other Line of Credit [Member] \| Minimum [Member]
Note 8 - Borrowings (Details) [Line Items]
Line of Credit Facility, Interest Rate During Period	2.00%
Other Line of Credit [Member] \| Maximum [Member]
Note 8 - Borrowings (Details) [Line Items]
Line of Credit Facility, Interest Rate During Period	6.00%
Other Line of Credit [Member]
Note 8 - Borrowings (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	19,000,000
Long-term Line of Credit	$ 0	$ 0