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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 $ 251,689us-gaap_SalesRevenueNet [1] $ 254,448us-gaap_SalesRevenueNet $ 243,483us-gaap_SalesRevenueNet $ 210,369us-gaap_SalesRevenueNet $ 272,096us-gaap_SalesRevenueNet [2] $ 252,191us-gaap_SalesRevenueNet [3] $ 260,624us-gaap_SalesRevenueNet $ 218,992us-gaap_SalesRevenueNet $ 1,003,903us-gaap_SalesRevenueNet [4] $ 959,989us-gaap_SalesRevenueNet [4] $ 932,020us-gaap_SalesRevenueNet [4]
LONG-LIVED ASSETS(2)                      
Long-lived assets 227,347us-gaap_PropertyPlantAndEquipmentNet [5]       230,845us-gaap_PropertyPlantAndEquipmentNet [5]       227,347us-gaap_PropertyPlantAndEquipmentNet [5] 230,845us-gaap_PropertyPlantAndEquipmentNet [5]  
UNITED STATES                      
SALES TO UNAFFILIATED CUSTOMERS(1)                      
Net sales                 487,001us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US		 [4] 458,585us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US		 [4] 421,355us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US		 [4]
LONG-LIVED ASSETS(2)                      
Long-lived assets 86,856us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US		 [5]       85,518us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US		 [5]       86,856us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US		 [5] 85,518us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US		 [5]  
UNITED KINGDOM                      
SALES TO UNAFFILIATED CUSTOMERS(1)                      
Net sales                 83,182us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_GB		 [4] 75,076us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_GB		 [4] 83,373us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_GB		 [4]
LONG-LIVED ASSETS(2)                      
Long-lived assets 10,604us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_GB		 [5]       16,541us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_GB		 [5]       10,604us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_GB		 [5] 16,541us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_GB		 [5]  
AUSTRALIA                      
SALES TO UNAFFILIATED CUSTOMERS(1)                      
Net sales                 79,922us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_AU		 [4] 78,569us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_AU		 [4] 87,115us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_AU		 [4]
LONG-LIVED ASSETS(2)                      
Long-lived assets 57,410us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_AU		 [5]       60,199us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_AU		 [5]       57,410us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_AU		 [5] 60,199us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_AU		 [5]  
Other Foreign Countries [Member]                      
SALES TO UNAFFILIATED CUSTOMERS(1)                      
Net sales                 353,798us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= tile_OtherForeignCountriesMember		 [4] 347,759us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= tile_OtherForeignCountriesMember		 [4] 340,177us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= tile_OtherForeignCountriesMember		 [4]
LONG-LIVED ASSETS(2)                      
Long-lived assets 20,384us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= tile_OtherForeignCountriesMember		 [5]       16,687us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= tile_OtherForeignCountriesMember		 [5]       20,384us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= tile_OtherForeignCountriesMember		 [5] 16,687us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= tile_OtherForeignCountriesMember		 [5]  
NETHERLANDS                      
LONG-LIVED ASSETS(2)                      
Long-lived assets 38,086us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_NL		 [5]       35,619us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_NL		 [5]       38,086us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_NL		 [5] 35,619us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_NL		 [5]  
CHINA                      
LONG-LIVED ASSETS(2)                      
Long-lived assets $ 14,007us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_CN		 [5]       $ 16,281us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_CN		 [5]       $ 14,007us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_CN		 [5] $ 16,281us-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.