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Note 3 - Earnings Per Share (Details) - Calculation of Income (Loss) Per Share (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Apr. 05, 2015	Mar. 30, 2014
Note 3 - Earnings Per Share (Details) - Calculation of Income (Loss) Per Share [Line Items]
Shares for Basic Earnings Per Share	66,420us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	66,471us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive Effect of Stock Options	51us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	101us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Shares for Diluted Earnings Per Share	66,471us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	66,572us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Participating Securities [Member]
Note 3 - Earnings Per Share (Details) - Calculation of Income (Loss) Per Share [Line Items]
Net Income (in Dollars)	0.3us-gaap_NetIncomeLoss / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember	0.1us-gaap_NetIncomeLoss / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember
Weighted Average Shares Outstanding	64,930tile_WeightedAverageSharesOutstandingBasicExcludingParticipatingSecurities / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember	65,000tile_WeightedAverageSharesOutstandingBasicExcludingParticipatingSecurities / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember
Participating Securities	1,490tile_ParticipatingSecurities / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember	1,471tile_ParticipatingSecurities / us-gaap_IncomeStatementLocationAxis = tile_ParticipatingSecuritiesMember

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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-Publisher FASB

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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