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Goodwill and Other Intangible Assets - Narrative (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)	Dec. 30, 2017 USD ($)
Goodwill [Line Items]
Goodwill	$ 279,482	$ 279,505
Office Furniture
Goodwill [Line Items]
Goodwill	96,426	$ 96,449
Office Furniture | One Reporting Unit
Goodwill [Line Items]
Increase (decrease) in fair value for 100 basis point increase in discount rate	4,200
Increase (decrease) in fair value for 100 basis point decrease in long-term growth rate	(2,000)
Goodwill	$ 19,600
Discount Rate | Office Furniture | One Reporting Unit
Goodwill [Line Items]
Goodwill impairment test measurement input	0.130
Near Term Growth Rate | Office Furniture | Minimum | One Reporting Unit
Goodwill [Line Items]
Goodwill impairment test measurement input	0.07
Near Term Growth Rate | Office Furniture | Maximum | One Reporting Unit
Goodwill [Line Items]
Goodwill impairment test measurement input	0.09
Long-term Revenue Growth Rate | Office Furniture | One Reporting Unit
Goodwill [Line Items]
Goodwill impairment test measurement input	0.03

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
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