Business and Summary of Significant Accounting Policies (Policies)	3 Months Ended
Mar. 28, 2020
Accounting Policies [Abstract]
Business and Basis of Presentation	We prepared the condensed consolidated financial statements as of and for the three months ended March 28, 2020 of Sleep Number Corporation and our 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 necessary to present fairly our financial position as of March 28, 2020 and December 28, 2019, and the consolidated results of operations and cash flows for the periods presented. Our 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. Additionally, based on the duration and severity of the current global situation involving the novel coronavirus (COVID-19) pandemic, including but not limited to general economic conditions, consumer confidence, store closings mandated by federal, state or local authorities and possible supply chain disruptions, the extent to which COVID-19 will impact our business and our consolidated financial results will depend on future developments, which are highly uncertain and cannot be predicted. 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 our most recent audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the fiscal year ended December 28, 2019 and other recent filings with the SEC.
Use of Estimates	The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires us 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. In addition, during the current environment involving COVID-19, predicting future events will be especially challenging for management. Changes in these estimates will be reflected in the consolidated financial statements in future periods and could be material. Our critical accounting policies consist of stock-based compensation, goodwill and indefinite-lived intangible assets, warranty liabilities and revenue recognition.
Consolidation	The condensed consolidated financial statements include the accounts of Sleep Number Corporation and our 100%-owned subsidiaries. All significant intra-entity balances and transactions have been eliminated in consolidation.
New Accounting Pronouncements	New Accounting Pronouncements Accounting Guidance Not Yet Adopted In April 2020, the Financial Accounting Standards Board (FASB) issued a Staff Q&A, Topic 842 and 840: Accounting For Lease Concessions Related to the Effects of the COVID-19 Pandemic. To provide clarity in response to the COVID-19 pandemic crisis, the FASB staff believes that it would be acceptable for entities to make an election to account for lease concessions related to the effects of the COVID-19 pandemic consistent with how those concessions would be accounted for under Topic 842 as though enforceable rights and obligations for those concessions existed (regardless of whether those enforceable rights and obligations for the concessions explicitly exist in the contract). Consequently, for concessions related to the effects of the COVID-19 pandemic, we will not have to analyze each contract to determine whether enforceable rights and obligations for concessions exist in the contract and can elect to apply or not apply the lease modification guidance in Topic 842 to those contracts. This election is available for concessions related to the effects of the COVID-19 pandemic that do not result in a substantial increase in the rights of the lessor or our obligations as the lessee. For example, this election is available for concessions that result in the total payments required by the modified contract being substantially the same as or less than total payments required by the original contract. The FASB staff expects that reasonable judgment will be exercised in making those determinations. Some concessions will provide a deferral of payments with no substantive changes to the consideration in the original contract. A deferral affects the timing, but the amount of the consideration is substantially the same as that required by the original contract. The staff expects that there will be multiple ways to account for those deferrals, none of which the staff believes are more preferable than the others. Two of those methods are: a.Account for the concessions as if no changes to the lease contract were made. Under that accounting, a lessor would increase its lease receivable, and a lessee would increase its accounts payable as receivables/payments accrue. In its income statement, a lessor would continue to recognize income, and a lessee would continue to recognize expense during the deferral period. b.Account for the deferred payments as variable lease payments. We are evaluating the effect of the new guidance on our condensed consolidated financial statements and related disclosures, and plan to select election method b. above. Under this election, deferred payments would be treated as variable rent payments, resulting in an adjustment to expense in the period in which they arise.
Leases	We lease our 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 our local market development approach generally results in long-term participation in given markets, our retail store leases generally provide for an initial lease term of five to 10 years. Our office and manufacturing leases provide for an initial lease term of up to 15 years. In addition, our 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 our sole discretion. Lease options are included in the lease term only if exercise is reasonably certain at lease commencement. Our lease agreements do not contain any material residual value guarantees. We also lease vehicles and certain equipment under operating leases with an initial lease term of three to five years. Our 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 we take possession of the property. During lease renewal negotiations that extend beyond the original lease term, we estimate 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. Future payments for real estate taxes and certain building operating expenses for which we are obligated are not included in operating lease costs. At March 28, 2020, our finance right-of-use assets and lease liabilities were not significant.

Business and Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 28, 2020

We prepared the condensed consolidated financial statements as of and for the three months ended March 28, 2020 of Sleep Number Corporation and our 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 necessary to present fairly our financial position as of March 28, 2020 and December 28, 2019, and the consolidated results of operations and cash flows for the periods presented. Our 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. Additionally, based on the duration and severity of the current global situation involving the novel coronavirus (COVID-19) pandemic, including but not limited to general economic conditions, consumer confidence, store closings mandated by federal, state or local authorities and possible supply chain disruptions, the extent to which COVID-19 will impact our business and our consolidated financial results will depend on future developments, which are highly uncertain and cannot be predicted.

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 our most recent audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the fiscal year ended December 28, 2019 and other recent filings with the SEC.

Use of Estimates

The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires us 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. In addition, during the current environment involving COVID-19, predicting future events will be especially challenging for management. Changes in these estimates will be reflected in the consolidated financial statements in future periods and could be material. Our critical accounting policies consist of stock-based compensation, goodwill and indefinite-lived intangible assets, warranty liabilities and revenue recognition.

Consolidation

The condensed consolidated financial statements include the accounts of Sleep Number Corporation and our 100%-owned subsidiaries. All significant intra-entity balances and transactions have been eliminated in consolidation.

New Accounting Pronouncements

Accounting Guidance Not Yet Adopted

In April 2020, the Financial Accounting Standards Board (FASB) issued a Staff Q&A, Topic 842 and 840: Accounting For Lease Concessions Related to the Effects of the COVID-19 Pandemic. To provide clarity in response to the COVID-19 pandemic crisis, the FASB staff believes that it would be acceptable for entities to make an election to account for lease concessions related to the effects of the COVID-19 pandemic consistent with how those concessions would be accounted for under Topic 842 as though enforceable rights and obligations for those concessions existed (regardless of whether those enforceable rights and obligations for the concessions explicitly exist in the contract).

Consequently, for concessions related to the effects of the COVID-19 pandemic, we will not have to analyze each contract to determine whether enforceable rights and obligations for concessions exist in the contract and can elect to apply or not apply the lease modification guidance in Topic 842 to those contracts. This election is available for concessions related to the effects of the COVID-19 pandemic that do not result in a substantial increase in the rights of the lessor or our obligations as the lessee. For example, this election is available for concessions that result in the total payments required by the modified contract being substantially the same as or less than total payments required by the original contract. The FASB staff expects that reasonable judgment will be exercised in making those determinations. Some concessions will provide a deferral of payments with no substantive changes to the consideration in the original contract. A deferral affects the timing, but the amount of the consideration is substantially the same as that required by the original contract. The staff expects that there will be multiple ways to account for those deferrals, none of which the staff believes are more preferable than the others. Two of those methods are:

a.Account for the concessions as if no changes to the lease contract were made. Under that accounting, a lessor would increase its lease receivable, and a lessee would increase its accounts payable as receivables/payments accrue. In its income statement, a lessor would continue to recognize income, and a lessee would continue to recognize expense during the deferral period.

b.Account for the deferred payments as variable lease payments.

We are evaluating the effect of the new guidance on our condensed consolidated financial statements and related disclosures, and plan to select election method b. above. Under this election, deferred payments would be treated as variable rent payments, resulting in an adjustment to expense in the period in which they arise.

Leases

We lease our 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 our local market development approach generally results in long-term participation in given markets, our retail store leases generally provide for an initial lease term of five to 10 years. Our office and manufacturing leases provide for an initial lease term of up to 15 years. In addition, our 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 our sole discretion. Lease options are included in the lease term only if exercise is reasonably certain at lease commencement. Our lease agreements do not contain any material residual value guarantees. We also lease vehicles and certain equipment under operating leases with an initial lease term of three to five years.

Our 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 we take possession of the property. During lease renewal negotiations that extend beyond the original lease term, we estimate 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. Future payments for real estate taxes and certain building operating expenses for which we are obligated are not included in operating lease costs.

At March 28, 2020, our finance right-of-use assets and lease liabilities were not significant.