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Shareholders' Equity - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jul. 05, 2020
Apr. 05, 2020
Jun. 30, 2019
Mar. 31, 2019
Jul. 05, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options outstanding (in shares) 20,000       20,000  
Options, exercise price range (dollars per share)         $ 12.43  
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)         0 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         $ (200,000) $ 1,500,000
Stock options granted (in shares)         308,100 224,000
Unrecognized compensation costs related to unvested restricted stock $ 4,700,000       $ 4,700,000  
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) $ 3,300,000
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 7,000,000.0       $ 7,000,000.0  
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         $ 500,000  
Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
tile_ForfeituresAndCompensationExpenseRelatedToStockAwardsValue $ 3,000 $ 25,000 $ 3,000 $ 22,000