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Enterprise-Wide Disclosures - Additional Information (Detail) | 12 Months Ended
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Dec. 30, 2012 Country Customer | Jan. 01, 2012 | Jan. 02, 2011
Enterprise Wide Disclosures [Line Items] |  |  |
Number of unaffiliated customer | 0 |  |
Unaffiliated customer accounted for sales | 10.00% |  |
Number of countries represented more than ten percent of the company's net sales | 0 |  |
Percentage of sales in foreign markets | 55.00% | 58.00% | 58.00%

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

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- Definition Number Of Customers Accounting For More Than Ten Percent Of Revenue + References No definition available. + Details
Name: | tile_NumberOfCustomersAccountingForMoreThanTenPercentOfRevenue
Namespace Prefix: | tile_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number Of Other Countries Representing Ten Percent Or More Of Net Revenue + References No definition available. + Details
Name: | tile_NumberOfOtherCountriesRepresentingTenPercentOrMoreOfNetRevenue
Namespace Prefix: | tile_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Revenue Generated From Foreign Countries + References No definition available. + Details
Name: | tile_PercentageOfRevenueGeneratedFromForeignCountries
Namespace Prefix: | tile_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration