Inventories - Schedule of Finished Goods Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Jan. 01, 2022
Inventory Disclosure [Abstract]
Finished beds, including certain retail display beds and deliveries in-transit to those customers who have utilized home delivery services	$ 36,708	$ 40,686
Finished components that were ready for assembly for the completion of beds	45,722	32,835
Retail accessories	23,717	20,288
Finished goods inventory	$ 106,147	$ 93,809

Carrying amount as of the balance sheet date of merchandise ready for assembly that are included in the finished goods inventory as finished components.

No definition available.

Name:	snbr_FinishedComponentsIncludedInFinishedGoodsInventoryNet
Namespace Prefix:	snbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant