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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 06, 2017 | Sep. 30, 2017 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment |  |  | $ 11,150,000 | $ 2,876,000 |
Gain on sale and license of intangible assets |  | $ 6,000,000 |  |  |
Goodwill and Other Intangible Assets |  |  | 490,892,000 | 511,419,000 |
Goodwill |  |  | 279,505,000 | 290,699,000 | $ 277,650,000
Trade names, net value |  |  | 29,201,000 | $ 38,054,000 |
Office furniture reporting unit one |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment | $ 6,300,000 |  | 4,800,000 |  |
Goodwill and Other Intangible Assets |  |  | 0 |  |
Goodwill |  |  | $ 19,600,000 |  |
Office furniture reporting unit one | Trademarks and trade names |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Intangible assets impairment | 8,300,000 |  |  |  |
Office furniture reporting unit two |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Discount rate utilized for each reporting unit with rates range (percent) |  |  | 13.50% |  |
Terminal growth (percent) |  |  | 3.00% |  |
Decrease in reporting unit due to 100 basis point increase in discount rate |  |  | $ 3,300,000 |  |
Decrease in reporting unit due to 100 basis point decrease in long-term growth rate |  |  | $ 1,400,000 |  |
Office furniture reporting unit two | Minimum |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Near term growth (percent) |  |  | 7.00% |  |
Office furniture reporting unit two | Maximum |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Near term growth (percent) |  |  | 10.00% |  |
Customer lists and other | Office furniture reporting unit one |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Intangible assets impairment | $ 1,500,000 |  |  |  |

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