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Reportable Segment Information (Business Segment Information) (Details) $ in Thousands	12 Months Ended
	Dec. 30, 2017 USD ($) segment	Dec. 31, 2016 USD ($)	Jan. 02, 2016 USD ($)
Segment Reporting [Abstract]
Number of business segments | segment	2
Segment Reporting Information [Line Items]
Net sales	$ 2,175,882	$ 2,203,489	$ 2,304,419
Total	70,612	128,911	157,170
Depreciation and amortization expense	72,872	68,947	57,564
Capital expenditures (including capitalized software)	127,391	119,584	114,966
Identifiable assets	1,391,550	1,330,234	1,263,925
Restructuring and impairment charges	37,416	11,005	11,792
Office Furniture
Segment Reporting Information [Line Items]
Restructuring and impairment charges	32,500	10,900	11,600
Hearth Products
Segment Reporting Information [Line Items]
Restructuring and impairment charges	4,900	5,500	900
Operating | Office Furniture
Segment Reporting Information [Line Items]
Net sales	1,660,723	1,703,885	1,777,804
Operating profit	50,176	117,397	136,593
Depreciation and amortization expense	48,435	45,088	42,415
Capital expenditures (including capitalized software)	79,458	65,944	64,850
Identifiable assets	821,767	749,145	739,915
Operating | Hearth Products
Segment Reporting Information [Line Items]
Net sales	515,159	499,604	526,615
Operating profit	83,649	69,960	78,162
Depreciation and amortization expense	10,109	12,486	8,430
Capital expenditures (including capitalized software)	17,356	11,217	11,078
Identifiable assets	347,189	340,494	341,813
General corporate
Segment Reporting Information [Line Items]
General corporate	(63,213)	(58,446)	(57,585)
Depreciation and amortization expense	14,328	11,373	6,719
Capital expenditures (including capitalized software)	30,577	42,423	39,038
Identifiable assets	$ 222,594	$ 240,595	$ 182,197

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Section S99
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 235
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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of restructuring charges, remediation cost, and asset impairment loss.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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