| Disaggregated Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
| Sep. 27, 2018 | Sep. 28, 2017 | Sep. 27, 2018 | Sep. 28, 2017 | |
| Net Sales | $ 435,882 | $ 343,923 | $ 1,273,109 | $ 995,266 | 
| Percentage of Net Sales | 100.00% | 100.00% | 100.00% | 100.00% | 
| Tile | ||||
| Net Sales | $ 119,988 | $ 103,209 | $ 360,798 | $ 299,685 | 
| Percentage of Net Sales | 28.00% | 30.00% | 28.00% | 30.00% | 
| Decorative Accessories | ||||
| Net Sales | $ 82,814 | $ 57,729 | $ 244,279 | $ 183,004 | 
| Percentage of Net Sales | 19.00% | 17.00% | 19.00% | 18.00% | 
| Laminate Luxury Vinyl Plank | ||||
| Net Sales | $ 83,667 | $ 52,758 | $ 227,995 | $ 146,240 | 
| Percentage of Net Sales | 19.00% | 15.00% | 18.00% | 15.00% | 
| Accessories Installation Materials and Tools | ||||
| Net Sales | $ 69,412 | $ 59,314 | $ 201,194 | $ 162,033 | 
| Percentage of Net Sales | 16.00% | 17.00% | 16.00% | 16.00% | 
| Wood | ||||
| Net Sales | $ 49,005 | $ 42,488 | $ 144,401 | $ 121,270 | 
| Percentage of Net Sales | 11.00% | 12.00% | 11.00% | 12.00% | 
| Natural Stone | ||||
| Net Sales | $ 28,025 | $ 25,327 | $ 85,564 | $ 76,754 | 
| Percentage of Net Sales | 6.00% | 8.00% | 7.00% | 8.00% | 
| Delivery and Other | ||||
| Net Sales | $ 2,971 | $ 3,098 | $ 8,878 | $ 6,280 | 
| Percentage of Net Sales | 1.00% | 1.00% | 1.00% | 1.00% |