XML 98 R81.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Note 15 - Employee Benefit Plans - Pension Plan Assets at Fair Value (Details) - USD ($) $ in Thousands | Jan. 01, 2017 | Jan. 03, 2016
--- | --- | ---
Fair value of plan assets | $ 258,365 | $ 239,280
European Plans [Member] |  |
Fair value of plan assets | 105,233 | 71,920
Uk Plan [Member] |  |
Fair value of plan assets | 153,132 | 167,360
Fair Value, Inputs, Level 1 [Member] |  |
Fair value of plan assets | 153,090 | 165,766
Fair Value, Inputs, Level 1 [Member] | European Plans [Member] |  |
Fair value of plan assets | 73,042 | 71,920
Fair Value, Inputs, Level 1 [Member] | Uk Plan [Member] |  |
Fair value of plan assets | 80,048 | 93,846
Fair Value, Inputs, Level 2 [Member] |  |
Fair value of plan assets | 50,364 | 59,228
Fair Value, Inputs, Level 2 [Member] | European Plans [Member] |  |
Fair value of plan assets | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Uk Plan [Member] |  |
Fair value of plan assets | 50,364 | 59,228
Fair Value, Inputs, Level 3 [Member] |  |
Fair value of plan assets | 54,911 | 14,286
Fair Value, Inputs, Level 3 [Member] | European Plans [Member] |  |
Fair value of plan assets | 32,191 | 0
Fair Value, Inputs, Level 3 [Member] | Uk Plan [Member] |  |
Fair value of plan assets | $ 22,720 | $ 14,286

X
- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=tile_EuropeanPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=tile_UKPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |