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Note 10 - Shareholders' Equity (Details) - Activity of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012	Jan. 01, 2012
Note 10 - Shareholders' Equity (Details) - Activity of Shareholders' Equity [Line Items]
Balance	$ 306,639us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	$ 340,787us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Net income	24,808us-gaap_ProfitLoss	48,255us-gaap_ProfitLoss	5,943us-gaap_ProfitLoss
Pension liability adjustment	15,280us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	(1,409)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	(771)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Foreign currency translation adjustment	(28,351)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(5,241)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	8,539us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Common Stock [Member]
Note 10 - Shareholders' Equity (Details) - Activity of Shareholders' Equity [Line Items]
Balance	6,597us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	6,631us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	6,606us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	6,548us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Balance (in Shares)	65,968us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	66,311us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	66,062us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	65,484us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock issuances under employee option plans	5us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	20us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	16us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Stock issuances under employee option plans (in Shares)	55us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	201us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	160us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Other issuances of common stock	49us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	67us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	58us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Other issuances of common stock (in Shares)	489us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	670us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	573us-gaap_StockIssuedDuringPeriodSharesOther / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Forfeitures and compensation expense related to stock awards	(38)tile_ForfeituresAndCompensationExpenseRelatedToStockAwardsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(62)tile_ForfeituresAndCompensationExpenseRelatedToStockAwardsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(16)tile_ForfeituresAndCompensationExpenseRelatedToStockAwardsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Forfeitures and compensation expense related to stock awards (in Shares)	(387)tile_ForfeituresAndCompensationExpenseRelatedToStockAwards / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(622)tile_ForfeituresAndCompensationExpenseRelatedToStockAwards / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(155)tile_ForfeituresAndCompensationExpenseRelatedToStockAwards / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Share repurchases	(50)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Share repurchases (in Shares)	(500)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Additional Paid-in Capital [Member]
Note 10 - Shareholders' Equity (Details) - Activity of Shareholders' Equity [Line Items]
Balance	368,603us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	374,597us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	366,677us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	361,400us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Stock issuances under employee option plans	381us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	1,814us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	2,030us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Other issuances of common stock	10,361us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	10,805us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	7,564us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Unamortized stock compensation expense related to restricted stock awards	(10,410)us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(10,872)us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(7,610)us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Forfeitures and compensation expense related to stock awards	1,293tile_ForfeituresAndCompensationExpenseRelatedToStockAwardsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	6,173tile_ForfeituresAndCompensationExpenseRelatedToStockAwardsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	3,293tile_ForfeituresAndCompensationExpenseRelatedToStockAwardsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Share repurchases	(7,619)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Retained Earnings [Member]
Note 10 - Shareholders' Equity (Details) - Activity of Shareholders' Equity [Line Items]
Balance	39,737us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	24,226us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	(16,746)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	(16,764)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Net income	24,808us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	48,255us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	5,943us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Cash dividends paid	(9,297)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	(7,283)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	(5,925)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Accumulated Defined Benefit Plans Adjustment [Member]
Note 10 - Shareholders' Equity (Details) - Activity of Shareholders' Equity [Line Items]
Balance	(49,362)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	(34,082)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	(35,491)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	(36,262)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Pension liability adjustment	(15,280)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	1,409us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember	771us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Accumulated Translation Adjustment [Member]
Note 10 - Shareholders' Equity (Details) - Activity of Shareholders' Equity [Line Items]
Balance	(58,936)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember	(30,585)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember	(25,344)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember	(33,883)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember
Foreign currency translation adjustment	$ (28,351)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember	$ (5,241)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember	$ 8,539us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember

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