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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 30, 2012 | Jan. 01, 2012 | Jan. 02, 2011
Commitments And Contingencies Disclosure [Line Items] |  |  |
Rental expense | $ 22.8 | $ 21.7 | $ 21.0
Rental expenses related to discontinued operations | $ 2.6 | $ 3.2 | $ 3.0

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- Details
Name: | tile_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix: | tile_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Rental Expenses Related To Discontinued Operations + References No definition available. + Details
Name: | tile_RentalExpensesRelatedToDiscontinuedOperations
Namespace Prefix: | tile_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration