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Goodwill, Impairment Loss, Effect of Fifty Basis Point Decrease in Long-term Growth Rate

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Goodwill, Impairment Loss, Effect of One Hundred Basis Point Increase in Discount Rate

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Amount of gain (loss) on sale or disposal of intangible assets.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Percentage of fair value of reporting unit in excess of carrying amount.

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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 28, 2019	Sep. 30, 2017	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Goodwill [Line Items]
Gain on sale and license of intangible assets		$ 6,000,000.0
Goodwill impairment	$ 0			$ 12,168,000
Goodwill	270,820,000		$ 270,820,000	270,788,000	$ 279,505,000
Office Furniture
Goodwill [Line Items]
Goodwill impairment				12,168,000
Goodwill	84,301,000		84,301,000	84,269,000	$ 96,449,000
Office Furniture \| Office furniture reporting unit one
Goodwill [Line Items]
Goodwill	$ 6,900,000		$ 6,900,000
Percentage of fair value in excess of carrying amount	68.00%		68.00%
Office Furniture \| Office furniture reporting unit two
Goodwill [Line Items]
Goodwill impairment				$ 12,200,000
Goodwill	$ 7,500,000		$ 7,500,000
Percentage of fair value in excess of carrying amount	15.00%		15.00%
Discount rate utilized for each reporting unit with rates range (percent)			14.00%
Terminal growth (percent)			3.00%
Decrease in reporting unit due to 100 basis point increase in discount rate			$ 2,800,000
Decrease in reporting unit due to 100 basis point decrease in long-term growth rate			$ 1,100,000
Office Furniture \| Office furniture reporting unit two \| Minimum
Goodwill [Line Items]
Near term growth (percent)			2.00%
Office Furniture \| Office furniture reporting unit two \| Maximum
Goodwill [Line Items]
Near term growth (percent)			5.50%
Office Furniture \| Office furniture reporting unit three
Goodwill [Line Items]
Goodwill	$ 14,100,000		$ 14,100,000
Percentage of fair value in excess of carrying amount	11.00%		11.00%
Discount rate utilized for each reporting unit with rates range (percent)			15.00%
Terminal growth (percent)			3.00%
Decrease in reporting unit due to 100 basis point increase in discount rate			$ 7,900,000
Decrease in reporting unit due to 100 basis point decrease in long-term growth rate			$ 1,800,000
Office Furniture \| Office furniture reporting unit three \| Minimum
Goodwill [Line Items]
Near term growth (percent)			10.00%
Office Furniture \| Office furniture reporting unit three \| Maximum
Goodwill [Line Items]
Near term growth (percent)			51.00%