Summary of Significant Accounting Policies - Computations Of Basic And Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended								12 Months Ended
	Dec. 20, 2018	Dec. 31, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Net earnings attributable to Mohawk Industries, Inc.		$ 248,222	$ 205,117	$ (48,257)	$ 110,514	$ 264,667	$ 155,518	$ 202,441	$ 121,585	$ 515,595	$ 744,211	$ 861,704
Accretion of redeemable noncontrolling interest										0	0	(3,892)
Net earnings available to common stockholders										$ 515,595	$ 744,211	$ 857,812
Weighted-average common shares outstanding-basic (in shares)										71,214	71,986	74,413
Add weighted-average dilutive potential common shares - options and RSU’s to purchase common shares, net (in shares)										187	278	360
Weighted-average common shares outstanding-diluted (in shares)										71,401	72,264	74,773
Basic earnings per share (usd per share)		$ 3.50	$ 2.88	$ (0.68)	$ 1.54	$ 3.69	$ 2.16	$ 2.80	$ 1.68	$ 7.24	$ 10.34	$ 11.53
Diluted earnings per share (usd per share)		$ 3.49	$ 2.87	$ (0.68)	$ 1.54	$ 3.68	$ 2.15	$ 2.79	$ 1.67	$ 7.22	$ 10.30	$ 11.47
Put option of redeemable noncontrolling interest	$ 33,884											$ 0