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Shareholders' Equity - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 04, 2020
Jul. 05, 2020
Apr. 05, 2020
Jun. 30, 2019
Mar. 31, 2019
Oct. 04, 2020
Sep. 29, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options outstanding (in shares) 0         0  
Stock options granted in period (in shares)           0 0
Stock options exercised in period (in shares)           7,500 10,000
Stock options forfeited in period (in shares)           20,000 5,000
Share-based Payment Arrangement, Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock compensation expense           $ 0 $ 0
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock compensation expense           $ 600,000 $ 2,500,000
Stock options granted (in shares)           308,100 224,000
Unrecognized compensation costs related to unvested restricted stock $ 3,800,000         $ 3,800,000  
Restricted Stock | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options, vesting period           1 year  
Restricted Stock | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options, vesting period           3 years  
Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock compensation expense           $ (2,000,000.0) $ 4,000,000.0
Stock options granted (in shares)           263,700  
Number of shares that may be issued in settlement of the performance shares to the award recipient, upper limit (percentage)           200.00%  
Unrecognized compensation expense 6,900,000         $ 6,900,000  
Performance Shares | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options, vesting period           1 year  
Performance Shares | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options, vesting period           3 years  
Restricted Stock and Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense, tax benefit           $ 300,000  
Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
tile_ForfeituresAndCompensationExpenseRelatedToStockAwardsValue $ 1,000 $ 3,000 $ 25,000 $ 3,000 $ 22,000