XML 58 R42.htm IDEA: XBRL DOCUMENT v3.8.0.1

Note 2 - Recent Accounting Pronouncements (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 02, 2017	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Deferred Tax Assets, Gross			$ 29,548	$ 48,079
Reclassification from Current Deferred Tax Assets to Noncurrent Deferred Tax Assets [Member] | Fiscal Year End January 1, 2017 [Member]
Prior Period Reclassification Adjustment	$ 10,000
Reclassification from Current Deferred Tax Assets and Noncurrent Deferred Tax Liabilities to Noncurrent Deferred Tax Assets [Member] | Fiscal Year End January 1, 2017 [Member]
Prior Period Reclassification Adjustment	5,900
Rreclassification from Noncurrent Deferred Tax Liabilities to Noncurrent Deferred Tax Assets [Member] | Fiscal Year End January 1, 2017 [Member]
Prior Period Reclassification Adjustment	4,100
Accounting Standards Update 2016-09 [Member]
Deferred Tax Assets, Gross			$ 9,400
Reclassification of Tax Withholdings from Cash from Operating Activities to Cash from Financing Activities [Member] | Fiscal 2016 [Member]
Prior Period Reclassification Adjustment	4,600
Reclassification of Tax Withholdings from Cash from Operating Activities to Cash from Financing Activities [Member] | Fiscal 2015 [Member]
Prior Period Reclassification Adjustment	$ 1,000
Reclassification From Operating Expenses to Other Expense [Member] | Fiscal 2016 [Member] | Scenario, Forecast [Member]
Prior Period Reclassification Adjustment		$ 2,200
Reclassification From Operating Expenses to Other Expense [Member] | Fiscal 2017 [Member] | Scenario, Forecast [Member]
Prior Period Reclassification Adjustment		$ 1,900
Product Concentration Risk [Member] | Revenue from Contract with Customer [Member] | Carpet, Hard Surface Flooring and Related Products [Member]
Concentration Risk, Percentage			95.00%
Product Concentration Risk [Member] | Revenue from Contract with Customer [Member] | Sale and Installation of Carpet and Related Products [Member]
Concentration Risk, Percentage			5.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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

X

- Definition

The amount of a reclassification adjustment made to prior period financial statement amounts.

+ References

No definition available.

+ Details

Name:	us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=tile_ReclassificationFromCurrentDeferredTaxAssetsToNoncurrentDeferredTaxAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreationDateAxis=tile_FiscalYearEndJanuary12017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=tile_ReclassificationFromCurrentDeferredTaxAssetsAndNoncurrentDeferredTaxLiabilitiesToNoncurrentDeferredTaxAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=tile_RreclassificationFromNoncurrentDeferredTaxLiabilitiesToNoncurrentDeferredTaxAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201609Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=tile_ReclassificationOfTaxWithholdingsFromCashFromOperatingActivitiesToCashFromFinancingActivitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreationDateAxis=tile_Fiscal2016Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreationDateAxis=tile_Fiscal2015Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=tile_ReclassificationFromOperatingExpensesToOtherExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreationDateAxis=tile_Fiscal2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_ProductConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_RevenueFromContractWithCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=tile_CarpetHardSurfaceFlooringAndRelatedProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ProductOrServiceAxis=tile_SaleAndInstallationOfCarpetAndRelatedProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: