Reportable Segment Information (Business Segment Information) (Details) $ in Thousands		3 Months Ended								12 Months Ended
		Jan. 02, 2016 USD ($)	Oct. 03, 2015 USD ($)	Jul. 04, 2015 USD ($)	Apr. 04, 2015 USD ($)	Jan. 03, 2015 USD ($)	Sep. 27, 2014 USD ($)	Jun. 28, 2014 USD ($)	Mar. 29, 2014 USD ($)	Jan. 02, 2016 USD ($) Segment	Jan. 03, 2015 USD ($)	Dec. 28, 2013 USD ($)
Segment Reporting Information [Line Items]
Number of business segments | Segment										2
Net sales		$ 596,866	$ 615,850	$ 568,226	$ 523,477	$ 646,661	$ 614,690	$ 509,143	$ 452,201	$ 2,304,419	$ 2,222,695	$ 2,059,964
Operating profit										214,755	164,119	144,001
Income before income taxes		46,628	$ 59,465	$ 37,557	$ 13,520	22,937	$ 50,868	$ 14,868	$ 16,258	157,170	104,931	96,707
Depreciation and amortization expense										57,564	56,722	46,621
Capital expenditures										114,966	112,713	78,895
Identifiable assets		1,263,925				1,239,334				1,263,925	1,239,334	1,134,705
Office Furniture [Member]
Segment Reporting Information [Line Items]
Net sales										1,777,804	1,739,049	1,685,205
Operating profit	[1]									136,593	87,053	97,339
Depreciation and amortization expense										42,415	45,891	36,992
Capital expenditures										64,850	62,696	51,954
Identifiable assets		739,915				724,293				739,915	724,293	722,697
Segment reporting information restructuring and impairment charges										11,700	33,000	300
Restructuring costs										400	8,800
Hearth Products [Member]
Segment Reporting Information [Line Items]
Net sales										526,615	483,646	374,759
Operating profit	[2]									78,162	77,066	46,662
Depreciation and amortization expense										8,430	5,415	5,288
Capital expenditures										11,078	6,342	4,220
Identifiable assets		341,813				341,315				341,813	341,315	255,978
Restructuring costs										900
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Unallocated corporate expense										(57,585)	(59,188)	(47,294)
Depreciation and amortization expense										6,719	5,416	4,341
Capital expenditures										39,038	43,675	22,721
Identifiable assets		$ 182,197				$ 173,726				$ 182,197	$ 173,726	$ 156,030

[1] Included in operating profit for the office furniture segment are pretax charges of $11.7 million, $33.0 million and $0.3 million, for closing of facilities and impairment charges in 2015, 2014 and 2013, respectively.

[2] Included in operating profit for the hearth products segment are pretax charges of $0.9 million related to exiting a line of business in 2015.