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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 29, 2018 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |  |  |  |
Gain on sale and license of intangible assets | $ 6,000,000 |  |  |  |
Goodwill impairment |  |  | $ 12,168,000 | $ 4,838,000 |
Intangible assets, net (including goodwill) |  |  | 463,290,000 | 490,892,000 |
Goodwill |  |  | 270,788,000 | 279,505,000 | $ 290,699,000
Trade names, net value |  |  | 28,788,000 | 29,201,000 |
Impairment of long-lived assets |  | $ 0 | 0 |  |
Office furniture reporting unit one |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment |  |  | 12,200,000 |  |
Goodwill |  |  | $ 7,500,000 |  |
Office furniture reporting unit two |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
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 |  |  | $ 2,300,000 |  |
Decrease in reporting unit due to 100 basis point decrease in long-term growth rate |  |  | $ 500,000 |  |
Office furniture reporting unit two | Minimum |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Near term growth (percent) |  |  | 1.00% |  |
Office furniture reporting unit two | Maximum |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Near term growth (percent) |  |  | 6.00% |  |
Office Furniture |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment |  | $ 0 | $ 12,168,000 | 4,838,000 |
Goodwill |  |  | $ 84,269,000 | $ 96,449,000 | $ 107,643,000

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