Business and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 28, 2024
Accounting Policies [Abstract]
Business & Basis of Presentation	Business & Basis of Presentation The Company prepared the condensed consolidated financial statements as of and for the three and nine months ended September 28, 2024 of Sleep Number Corporation and its 100%-owned subsidiaries (Sleep Number or the Company), without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (SEC) and they reflect, in the opinion of management, all normal recurring adjustments, including the elimination of all significant intra-entity balances and transactions, necessary to present fairly its financial position as of September 28, 2024 and December 30, 2023, and the consolidated results of operations and cash flows for the periods presented. The historical and quarterly consolidated results of operations may not be indicative of the results that may be achieved for the full year or any future period. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (GAAP) have been condensed or omitted pursuant to such rules and regulations. These condensed consolidated financial statements should be read in conjunction with the most recent audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 30, 2023 and other recent filings with the SEC.
Use of Estimates	The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires the Company to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of sales, expenses and income taxes during the reporting period. Predicting future events is inherently an imprecise activity and, as such, requires the use of judgment. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in these estimates will be reflected in the consolidated financial statements in future periods and could be material. The Company’s critical accounting policies consist of stock-based compensation, warranty liabilities and revenue recognition.
Recent Issued Accounting Pronouncements Not Yet Adopted	Recent Issued Accounting Pronouncements Not Yet Adopted Segment Reporting (Topic 280) In November 2023, the Financial Accounting Standards Board issued guidance within Accounting Standards Update (ASU) 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This ASU requires that a public entity that has a single reportable segment provide all the disclosures required by the amendments in this ASU and all existing disclosures in Topic 280. The Company has determined that its current business and operations consist of a single business segment and a single reporting unit. The amendments in this ASU are intended to improve segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. The key amendments included in this ASU: •Require disclosure on an annual and interim basis, of significant segment expenses that are regularly provided to the chief operating decision maker (CODM) and are included within each reported measure of segment profit and loss. •Require disclosure on an annual and interim basis, an amount for other segment items (defined in this ASU) and a description of its composition. •Clarify that if the CODM uses more than one measure of the segment’s profit or loss in assessing performance, one or more of those additional measures may be reported. •Require disclosure of the title and position of the CODM and an explanation of how the CODM uses the reported measure(s) of segment profit or loss in assessing performance. This ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. This guidance is required to be adopted by the Company beginning with the annual period of 2024. The amendments should be applied retrospectively to all prior periods presented in the consolidated financial statements. The Company is currently evaluating the impact of this ASU on the Company’s consolidated financial statements. Currently, management does not believe that any other recently issued, but not yet effective accounting pronouncements, if currently adopted, would have a material impact on the Company’s unaudited condensed consolidated financial statements.
Leases	The Company leases its retail, office and manufacturing space under operating leases which, in addition to the minimum lease payments, may require payment of a proportionate share of the real estate taxes and certain building operating expenses. While the Company’s local market development approach generally results in long-term participation in given markets, the retail store leases generally provide for an initial lease term of five to ten years. The Company’s office and manufacturing leases provide for an initial lease term of up to fifteen years. In addition, the Company’s mall-based retail store leases may require payment of variable rent based on net sales in excess of certain thresholds. Certain leases may contain options to extend the term of the original lease. The exercise of lease renewal options is at the Company’s sole discretion. Lease options are included in the lease term only if exercise is reasonably certain at lease commencement. The Company’s lease agreements do not contain any material residual value guarantees. The Company also leases vehicles and certain equipment under operating leases with an initial lease term of three to six years. The Company’s operating lease costs include facility, vehicle and equipment lease costs, but exclude variable lease costs. Operating lease costs are recognized on a straight-line basis over the lease term, after consideration of rent escalations and rent holidays. The lease term for purposes of the calculation begins on the earlier of the lease commencement date or the date the Company takes possession of the property. During lease renewal negotiations that extend beyond the original lease term, the Company estimates straight-line rent expense based on current market conditions. Variable lease costs are recorded when it is probable the cost has been incurred and the amount can be reasonably estimated.