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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% |  |

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