Restructuring, acquisition and integration-related costs - Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2019	$ 4,259
Restructuring costs	11,709	$ 32,937
Cash payments	(5,775)
Non-cash items	(7,722)
Balance as of March 28, 2020	2,471
Lease impairments
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2019	21
Cash payments	(8)
Non-cash items	0
Balance as of March 28, 2020	13
Asset write-downs
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2019	0
Cash payments	0
Non-cash items	(4,438)
Balance as of March 28, 2020	0
Severance
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2019	4,122
Cash payments	(2,010)
Non-cash items	(144)
Balance as of March 28, 2020	2,310
Other restructuring costs
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2019	116
Cash payments	(3,757)
Non-cash items	(3,140)
Balance as of March 28, 2020	148
Provision - Corporate
Restructuring Reserve [Roll Forward]
Restructuring costs	61
Provision - Corporate | Lease impairments
Restructuring Reserve [Roll Forward]
Restructuring costs	0
Provision - Corporate | Asset write-downs
Restructuring Reserve [Roll Forward]
Restructuring costs	0
Provision - Corporate | Severance
Restructuring Reserve [Roll Forward]
Restructuring costs	61
Provision - Corporate | Other restructuring costs
Restructuring Reserve [Roll Forward]
Restructuring costs	0
Operating segments | Provision - Flooring NA segment
Restructuring Reserve [Roll Forward]
Restructuring costs	8,769
Operating segments | Provision - Flooring NA segment | Lease impairments
Restructuring Reserve [Roll Forward]
Restructuring costs	0
Operating segments | Provision - Flooring NA segment | Asset write-downs
Restructuring Reserve [Roll Forward]
Restructuring costs	2,833
Operating segments | Provision - Flooring NA segment | Severance
Restructuring Reserve [Roll Forward]
Restructuring costs	0
Operating segments | Provision - Flooring NA segment | Other restructuring costs
Restructuring Reserve [Roll Forward]
Restructuring costs	5,936
Operating segments | Provision - Flooring ROW segment
Restructuring Reserve [Roll Forward]
Restructuring costs	2,879
Operating segments | Provision - Flooring ROW segment | Lease impairments
Restructuring Reserve [Roll Forward]
Restructuring costs	0
Operating segments | Provision - Flooring ROW segment | Asset write-downs
Restructuring Reserve [Roll Forward]
Restructuring costs	1,605
Operating segments | Provision - Flooring ROW segment | Severance
Restructuring Reserve [Roll Forward]
Restructuring costs	281
Operating segments | Provision - Flooring ROW segment | Other restructuring costs
Restructuring Reserve [Roll Forward]
Restructuring costs	$ 993