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Receivables - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 30, 2012	Jan. 01, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for bad debt	$ 8.8	$ 8.9
Reserve for sales return and allowances	$ 3.1	$ 4.3

X

- Definition

Accumulated Allowances For Bad Debt

+ References

No definition available.

+ Details

Name:	tile_AccumulatedAllowancesForBadDebt
Namespace Prefix:	tile_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Reserve For Sales Return And Allowances

+ References

No definition available.

+ Details

Name:	tile_ReserveForSalesReturnAndAllowances
Namespace Prefix:	tile_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration