Summary of Significant Accounting Policies - Segment (Details)
$ in Thousands |
3 Months Ended |
9 Months Ended |
12 Months Ended |
|
Sep. 28, 2017
USD ($)
|
Sep. 29, 2016
USD ($)
|
Sep. 28, 2017
USD ($)
segment
|
Sep. 29, 2016
USD ($)
|
Dec. 29, 2016
USD ($)
segment
|
Dec. 31, 2015
USD ($)
|
Dec. 25, 2014
USD ($)
|
| Revenue from External Customer [Line Items] |
|
|
|
|
|
|
|
| Number of reportable segments | segment |
|
|
1
|
|
1
|
|
|
| Net sales |
$ 343,923
|
$ 271,311
|
$ 995,266
|
$ 772,465
|
$ 1,050,759
|
$ 784,012
|
$ 584,588
|
| Net sales (as a percentage) |
|
|
|
|
100.00%
|
100.00%
|
100.00%
|
| Tile |
|
|
|
|
|
|
|
| Revenue from External Customer [Line Items] |
|
|
|
|
|
|
|
| Net sales |
|
|
|
|
$ 325,433
|
$ 244,902
|
$ 174,271
|
| Net sales (as a percentage) |
|
|
|
|
31.00%
|
31.00%
|
30.00%
|
| Decorative Accessories |
|
|
|
|
|
|
|
| Revenue from External Customer [Line Items] |
|
|
|
|
|
|
|
| Net sales |
|
|
|
|
$ 188,371
|
$ 138,442
|
$ 98,991
|
| Net sales (as a percentage) |
|
|
|
|
18.00%
|
18.00%
|
16.00%
|
| Accessories Installation Materials and Tools |
|
|
|
|
|
|
|
| Revenue from External Customer [Line Items] |
|
|
|
|
|
|
|
| Net sales |
|
|
|
|
$ 165,330
|
$ 124,162
|
$ 91,122
|
| Net sales (as a percentage) |
|
|
|
|
16.00%
|
16.00%
|
16.00%
|
| Wood |
|
|
|
|
|
|
|
| Revenue from External Customer [Line Items] |
|
|
|
|
|
|
|
| Net sales |
|
|
|
|
$ 142,751
|
$ 116,999
|
$ 90,752
|
| Net sales (as a percentage) |
|
|
|
|
14.00%
|
15.00%
|
16.00%
|
| Laminate Luxury Vinyl Plank |
|
|
|
|
|
|
|
| Revenue from External Customer [Line Items] |
|
|
|
|
|
|
|
| Net sales |
|
|
|
|
$ 131,447
|
$ 77,586
|
$ 61,817
|
| Net sales (as a percentage) |
|
|
|
|
12.00%
|
10.00%
|
11.00%
|
| Natural Stone |
|
|
|
|
|
|
|
| Revenue from External Customer [Line Items] |
|
|
|
|
|
|
|
| Net sales |
|
|
|
|
$ 90,866
|
$ 78,294
|
$ 65,008
|
| Net sales (as a percentage) |
|
|
|
|
9.00%
|
10.00%
|
11.00%
|
| Delivery and Other |
|
|
|
|
|
|
|
| Revenue from External Customer [Line Items] |
|
|
|
|
|
|
|
| Net sales |
|
|
|
|
$ 6,561
|
$ 3,627
|
$ 2,627
|
| Net sales (as a percentage) |
|
|
|
|
0.00%
|
0.00%
|
0.00%
|