Reportable Segment Information (Business Segment Information) (Details) (USD $)	3 Months Ended												12 Months Ended
	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 28, 2013 Segment		Dec. 29, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of business segments													2
Net sales	$ 541,263,000	$ 565,706,000	$ 510,698,000	$ 442,297,000	$ 527,536,000	$ 550,855,000	$ 480,400,000	$ 445,212,000	$ 500,269,000	$ 504,220,000	$ 432,810,000	$ 396,151,000	$ 2,059,964,000		$ 2,004,003,000		$ 1,833,450,000
Operating profit													144,001,000		118,326,000		114,378,000
Income before income taxes	36,118,000	42,447,000	17,588,000	554,000	27,870,000	39,240,000	10,733,000	(239,000)	27,245,000	38,102,000	7,347,000	(2,535,000)	96,707,000		77,604,000		70,159,000
Depreciation and amortization expense													46,621,000		43,360,000		46,287,000
Capital expenditures													78,895,000		60,270,000		31,143,000
Identifiable assets	1,134,705,000				1,077,066,000				1,051,722,000				1,134,705,000		1,077,066,000		1,051,722,000
Office Furniture [Member]
Segment Reporting Information [Line Items]
Net sales													1,685,205,000		1,687,302,000		1,528,050,000
Operating profit													97,339,000	[1]	91,849,000	[1]	99,626,000	[1]
Depreciation and amortization expense													36,992,000		34,491,000		36,109,000
Capital expenditures													51,954,000		36,080,000		24,061,000
Identifiable assets	722,697,000				700,665,000				671,334,000				722,697,000		700,665,000		671,334,000
Segment reporting information restructuring and impairment charges													300,000		1,900,000		2,800,000
Hearth Products [Member]
Segment Reporting Information [Line Items]
Net sales													374,759,000		316,701,000		305,400,000
Operating profit													46,662,000	[2]	26,477,000	[2]	14,752,000	[2]
Depreciation and amortization expense													5,288,000		5,958,000		7,574,000
Capital expenditures													4,220,000		2,008,000		2,179,000
Identifiable assets	255,978,000				254,835,000				259,142,000				255,978,000		254,835,000		259,142,000
Segment reporting information restructuring and impairment charges																	400,000
Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Unallocated corporate expense													(47,294,000)		(40,722,000)		(44,219,000)
Depreciation and amortization expense													4,341,000		2,911,000		2,604,000
Capital expenditures													22,721,000		22,182,000		4,903,000
Identifiable assets	$ 156,030,000				$ 121,566,000				$ 121,246,000				$ 156,030,000		$ 121,566,000		$ 121,246,000

[1] Included in operating profit for the office furniture segment are pretax charges of $0.3 million, $1.9 million and $2.8 million, for closing of facilities and impairment charges in 2013, 2012 and 2011, respectively.

[2] Included in operating profit for the hearth products segment are pretax charges of $0.4 million for closing facilities in 2011