Reportable Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 28, 2020 USD ($) segment	Mar. 30, 2019 USD ($)	Dec. 28, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Net sales	$ 468,704	$ 479,456
Operating income (loss)	(23,728)	3,677
Interest expense, net	1,811	2,111
Income (loss) before income taxes	(25,539)	1,566
Depreciation and amortization	19,487	19,040
Capital Expenditures (including capitalized software)	13,159	19,096
Identifiable Assets	1,369,899		$ 1,452,512
Operating segments | Office Furniture
Segment Reporting Information [Line Items]
Net sales	338,386	353,511
Operating income (loss)	(33,231)	(1,731)
Depreciation and amortization	11,332	11,060
Capital Expenditures (including capitalized software)	7,101	10,319
Identifiable Assets	785,063		874,913
Operating segments | Hearth Products
Segment Reporting Information [Line Items]
Net sales	130,318	125,945
Operating income (loss)	20,671	17,609
Depreciation and amortization	2,306	2,056
Capital Expenditures (including capitalized software)	2,973	4,998
Identifiable Assets	376,862		364,653
General corporate
Segment Reporting Information [Line Items]
Operating income (loss)	(11,168)	(12,201)
Depreciation and amortization	5,849	5,924
Capital Expenditures (including capitalized software)	3,085	$ 3,779
Identifiable Assets	$ 207,974		$ 212,946