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Note 6 - Derivative Instruments (Details Textual) - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019	Oct. 01, 2017
Interest Rate Swap 1 [Member]
Derivative, Notional Amount			$ 100
Interest Rate Swap 2 [Member]
Derivative, Notional Amount		$ 150
Interest Rate Swap [Member]
Derivative, Notional Amount	$ 250
Foreign Exchange Forward [Member]
Derivative, Notional Amount	$ 12

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=tile_InterestRateSwap1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=tile_InterestRateSwap2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: