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Note 3 - Revenue Recognition - Disaggregation of Revenue (Details) | 12 Months Ended
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Dec. 30, 2018
Americas [Member] |
Percentage of net sales | 57.80%
Europe [Member] |
Percentage of net sales | 27.10%
Asia Pacific [Member] |
Percentage of net sales | 15.10%

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- Definition The percent of revenue due to direct sales to customers. + References No definition available. + Details
Name: | tile_PercentOfRevenueDueToSalesToCustomers
Namespace Prefix: | tile_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=srt_AmericasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_EuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_AsiaPacificMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |