Quarterly Financial Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 31, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011		Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 1,435,659	$ 1,473,493	$ 1,469,793	$ 1,409,035	$ 1,378,297	[1]	$ 1,442,512	$ 1,477,854	$ 1,343,595	$ 5,787,980	[2]	$ 5,642,258	[2]	$ 5,319,072	[2]
Gross profit	369,331	372,837	388,464	359,426	335,417	[1]	357,623	382,247	341,592	1,490,058		1,416,879		1,402,600
Net earnings	66,389	70,304	73,188	40,377	42,931	[1]	46,646	60,903	23,442	250,258		173,922		185,471
Basic earnings per share	$ 0.96	$ 1.02	$ 1.06	$ 0.59	$ 0.62	[1]	$ 0.68	$ 0.89	$ 0.34	$ 3.63		$ 2.53		$ 2.66
Diluted earnings per share	$ 0.96	$ 1.01	$ 1.06	$ 0.58	$ 0.62	[1]	$ 0.68	$ 0.88	$ 0.34	$ 3.61		$ 2.52		$ 2.65
Selling, general and administrative expense					$ 6,035

[1] During the fourth quarter of 2011, the Company corrected an immaterial error in its consolidated financial statements. The error related to accounting for operating leases. The correction of $6,035 resulted in an additional charge to selling, general and administrative expense in the Company’s 2011 fourth quarter consolidated statement of operations. The Company believes the correction of this error to be both quantitatively and qualitatively immaterial to its quarterly results for 2011 or to any of its previously issued consolidated financial statements. The correction had no impact on the Company’s cash flows as previously presented.

[2] The Soft surface product category includes carpets, rugs, carpet pad and resilient. The Tile product category includes ceramic tile, porcelain tile and natural stone. The Wood product category includes laminate, hardwood, roofing panels, wood-based panels and licensing.