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Receivables - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Dec. 30, 2012 | Jan. 01, 2012
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Allowance for bad debt | $ 8.8 | $ 8.9
Reserve for sales return and allowances | $ 3.1 | $ 4.3

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- Definition Accumulated Allowances For Bad Debt + References No definition available. + Details
Name: | tile_AccumulatedAllowancesForBadDebt
Namespace Prefix: | tile_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Reserve For Sales Return And Allowances + References No definition available. + Details
Name: | tile_ReserveForSalesReturnAndAllowances
Namespace Prefix: | tile_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration