General form of registration statement for all companies including face-amount certificate companies

Summary of Significant Accounting Policies - Segment (Details)

v3.8.0.1
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%