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Inventories (Details) - USD ($) $ in Thousands | Dec. 30, 2017 | Dec. 31, 2016
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 6,577 | $ 7,973
Work in progress | 170 | 72
Finished goods | 77,551 | 66,981
Inventories | 84,298 | 75,026
Components of finished goods inventory [Abstract] |  |
Finished beds included in finished goods inventory | 25,000 | 21,000
Finished components included in finished goods inventory | 35,000 | 29,000
Retail accessories included in finished goods inventory | $ 18,000 | $ 17,000

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