Inventories - Schedule of Finished Goods Inventories (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Inventory Disclosure [Abstract]
Finished beds, including deliveries in-transit to those customers who have utilized home delivery services	$ 34,725	$ 39,235
Finished components that were ready for assembly for the completion of beds	39,634	46,179
Retail accessories	17,229	20,835
Finished goods inventory	$ 91,588	$ 106,249

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