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Note 18 - Enterprise-Wide Disclosure (Details) - Revenue and Long-Lived Assets Related to Operations (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 28, 2014 | Sep. 28, 2014 | Jun. 29, 2014 | Mar. 30, 2014 | Dec. 29, 2013 | Sep. 29, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 28, 2014 | Dec. 29, 2013 | Dec. 30, 2012
SALES TO UNAFFILIATED CUSTOMERS(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 251,689 us-gaap_SalesRevenueNet | [1] | $ 254,448 us-gaap_SalesRevenueNet | $ 243,483 us-gaap_SalesRevenueNet | $ 210,369 us-gaap_SalesRevenueNet | $ 272,096 us-gaap_SalesRevenueNet | [2] | $ 252,191 us-gaap_SalesRevenueNet | [3] | $ 260,624 us-gaap_SalesRevenueNet | $ 218,992 us-gaap_SalesRevenueNet | $ 1,003,903 us-gaap_SalesRevenueNet | [4] | $ 959,989 us-gaap_SalesRevenueNet | [4] | $ 932,020 us-gaap_SalesRevenueNet | [4]
LONG-LIVED ASSETS(2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 227,347 us-gaap_PropertyPlantAndEquipmentNet | [5] |  |  |  | 230,845 us-gaap_PropertyPlantAndEquipmentNet | [5] |  |  |  |  | 227,347 us-gaap_PropertyPlantAndEquipmentNet | [5] | 230,845 us-gaap_PropertyPlantAndEquipmentNet | [5] |  |
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES TO UNAFFILIATED CUSTOMERS(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 487,001 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | [4] | 458,585 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | [4] | 421,355 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | [4]
LONG-LIVED ASSETS(2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 86,856 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | [5] |  |  |  | 85,518 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | [5] |  |  |  |  | 86,856 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | [5] | 85,518 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | [5] |  |
UNITED KINGDOM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES TO UNAFFILIATED CUSTOMERS(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 83,182 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB | [4] | 75,076 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB | [4] | 83,373 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB | [4]
LONG-LIVED ASSETS(2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 10,604 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_GB | [5] |  |  |  | 16,541 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_GB | [5] |  |  |  |  | 10,604 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_GB | [5] | 16,541 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_GB | [5] |  |
AUSTRALIA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES TO UNAFFILIATED CUSTOMERS(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 79,922 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_AU | [4] | 78,569 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_AU | [4] | 87,115 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_AU | [4]
LONG-LIVED ASSETS(2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 57,410 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_AU | [5] |  |  |  | 60,199 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_AU | [5] |  |  |  |  | 57,410 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_AU | [5] | 60,199 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_AU | [5] |  |
Other Foreign Countries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SALES TO UNAFFILIATED CUSTOMERS(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 353,798 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = tile_OtherForeignCountriesMember | [4] | 347,759 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = tile_OtherForeignCountriesMember | [4] | 340,177 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = tile_OtherForeignCountriesMember | [4]
LONG-LIVED ASSETS(2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 20,384 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = tile_OtherForeignCountriesMember | [5] |  |  |  | 16,687 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = tile_OtherForeignCountriesMember | [5] |  |  |  |  | 20,384 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = tile_OtherForeignCountriesMember | [5] | 16,687 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = tile_OtherForeignCountriesMember | [5] |  |
NETHERLANDS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-LIVED ASSETS(2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 38,086 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_NL | [5] |  |  |  | 35,619 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_NL | [5] |  |  |  |  | 38,086 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_NL | [5] | 35,619 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_NL | [5] |  |
CHINA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-LIVED ASSETS(2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | $ 14,007 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN | [5] |  |  |  | $ 16,281 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN | [5] |  |  |  |  | $ 14,007 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN | [5] | $ 16,281 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN | [5] |  |
[1] | The fourth quarter of 2013 includes a gain of $7.0 million related to final settlement of the Company's fire insurance claim in Australia. The fourth quarter of 2013 also includes $1.7 million of expenses related to debt retirement.
[2] | Results for the fourth quarter of 2014 include debt retirement expenses of $12.0 million.
[3] | Results for the third quarter of 2014 include restructuring and asset impairment charges of $12.4 million.
[4] | Revenue attributed to geographic areas is based on the location of the customer.
[5] | Long-lived assets include tangible assets physically located in foreign countries.

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