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Reportable Segment Information (Net Sales By Product Category) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Revenue from External Customer [Line Items] |  |  |
Net sales | $ 2,257,895 | $ 2,175,882 | $ 2,203,489
Systems and storage |  |  |
Revenue from External Customer [Line Items] |  |  |
Net sales | 1,015,900 | 1,069,518 | 1,072,518
Seating |  |  |
Revenue from External Customer [Line Items] |  |  |
Net sales | 598,722 | 536,501 | 539,839
Other |  |  |
Revenue from External Customer [Line Items] |  |  |
Net sales | 91,470 | 54,704 | 91,528
Hearth Products |  |  |
Revenue from External Customer [Line Items] |  |  |
Net sales | $ 551,803 | $ 515,159 | $ 499,604

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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