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Note 2 - Recent Accounting Pronouncements (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 30, 2014
Dec. 29, 2013
Dec. 28, 2014
Note 2 - Recent Accounting Pronouncements (Details) [Line Items]      
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent   $ 34,162,000us-gaap_DeferredTaxAssetsNetNoncurrent $ 33,138,000us-gaap_DeferredTaxAssetsNetNoncurrent
Presentation of Unrecognized Tax Benefits [Member]      
Note 2 - Recent Accounting Pronouncements (Details) [Line Items]      
Increase (Decrease) in Other Noncurrent Liabilities (21,800,000)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= tile_PresentationOfUnrecognizedTaxBenefitsMember
(21,800,000)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= tile_PresentationOfUnrecognizedTaxBenefitsMember
 
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent $ (21,800,000)us-gaap_DeferredTaxAssetsNetNoncurrent
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= tile_PresentationOfUnrecognizedTaxBenefitsMember
$ (21,800,000)us-gaap_DeferredTaxAssetsNetNoncurrent
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= tile_PresentationOfUnrecognizedTaxBenefitsMember