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Note 16 - Employee Benefit Plans (Details) - Components of Accumulated Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013
Note 16 - Employee Benefit Plans (Details) - Components of Accumulated Other Comprehensive Income [Line Items]
	$ 49,362us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	$ 34,082us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Domestic SCP [Member]
Note 16 - Employee Benefit Plans (Details) - Components of Accumulated Other Comprehensive Income [Line Items]
Unrecognized actuarial loss	3,949us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tile_DomesticSCPMember	2,614us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tile_DomesticSCPMember
Unrecognized transition asset	0us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetTransitionAssetsObligationsAfterTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tile_DomesticSCPMember	0us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetTransitionAssetsObligationsAfterTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tile_DomesticSCPMember
Unamortized prior service cost	0us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tile_DomesticSCPMember	14us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tile_DomesticSCPMember
	$ 3,949us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tile_DomesticSCPMember	$ 2,628us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tile_DomesticSCPMember

X

- Details

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Period Type:	duration

X

- Definition

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (j-k)

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

+ Details

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X

- Definition

After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise.

+ 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

Amount after tax of cost (credit) due to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as a component of net periodic benefit cost.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

After tax amount of transition assets (obligations), as of the date FAS 87 or 106 was initially applied, that has not yet been recognized as a component of net periodic benefit cost.

+ References

No definition available.

+ Details

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

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- Details

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