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Business and Summary of Significant Accounting Policies (Policies) | 12 Months Ended
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Dec. 29, 2018
Accounting Policies [Abstract] |
Business and Basis of Presentation | Business & Basis of Presentation Sleep Number Corporation and our 100%-owned subsidiaries (Sleep Number or the Company) have a vertically integrated business model and are the exclusive designer, manufacturer, marketer, retailer and servicer of Sleep Number beds which allows us to offer consumers high-quality, individualized sleep solutions and services. Sleep Number also offers FlextFit adjustable bases, and Sleep Number pillows, sheets and other bedding products. We generate revenue by marketing our innovations to new and existing customers, and by selling products through two distribution channels. Our Company-Controlled channel, which includes retail, online and phone, sells directly to consumers. Our Wholesale/Other channel sells to and through selected retail and wholesale customers in the United States. The consolidated financial statements include the accounts of Sleep Number Corporation and our subsidiaries. All significant intra-entity balances and transactions have been eliminated in consolidation.
Fiscal Year | Fiscal Year Our fiscal year ends on the Saturday closest to December 31. Fiscal years and their respective fiscal year ends were as follows: fiscal 2018 ended December 29, 2018; fiscal 2017 ended December 30, 2017; and fiscal 2016 ended December 31, 2016. Fiscal years 2018, 2017 and 2016 each had 52 weeks.
Use of Estimates in the Preparation of Financial Statements | Use of Estimates in the Preparation of Financial Statements The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles (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 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 financial statements in future periods. Our critical accounting policies consist of stock-based compensation, goodwill and indefinite-lived intangible assets, warranty liabilities and revenue recognition.
Cash and Cash Equivalents | Cash and Cash Equivalents Cash and cash equivalents include highly liquid investments with original maturities of three months or less. The carrying value of these investments approximates fair value due to their short-term maturity. Our banking arrangements allow us to fund outstanding checks when presented to the financial institution for payment, resulting in book overdrafts. Book overdrafts are included in accounts payable in our consolidated balance sheets and in net increase in short-term borrowings in the financing activities section of our consolidated statements of cash flows. Book overdrafts totaled $38 million and $30 million at December 29, 2018 and December 30, 2017, respectively.
Accounts Receivable | Accounts Receivable Accounts receivable are recorded net of an allowance for expected losses and consist primarily of receivables from third-party financiers for customer credit card purchases and receivables from wholesale customers. The allowance is recognized in an amount equal to anticipated future write-offs. We estimate future write-offs based on delinquencies, aging trends, industry risk trends, our historical experience and current trends. Account balances are charged off against the allowance when we believe it is probable the receivable will not be recovered.
Inventories | Inventories Inventories include materials, labor and overhead and are stated at the lower of cost or net realizable value. Cost is determined by the first-in, first-out method. We review inventory quantities on hand and record reserves for obsolescence based on historical selling prices, current market conditions and forecasted product demand, to reduce inventory to net realizable value.
Property and Equipment | Property and Equipment Property and equipment, carried at cost, is depreciated using the straight-line method over the estimated useful lives of the assets. The cost and related accumulated depreciation of assets sold or retired is removed from the accounts with any resulting gain or loss included in net income in our consolidated statements of operations. Maintenance and repairs are charged to expense as incurred. Major renewals and betterments that extend useful life are capitalized. Leasehold improvements are depreciated over the shorter of the estimated useful lives of the assets or the contractual term of the lease, with consideration of lease renewal options if renewal appears probable. Estimated useful lives of our property and equipment by major asset category are as follows:
Leasehold improvements |  | 5 to 15 years
Furniture and equipment |  | 3 to 15 years
Production machinery |  | 3 to 7 years
Computer equipment and software |  | 3 to 12 years
Goodwill and Intangible Assets, Net | Goodwill and Intangible Assets, Net Goodwill is the difference between the purchase price of a company and the fair market value of the acquired company's net identifiable assets. Our intangible assets include developed technologies and trade names/trademarks. Definite-lived intangible assets are being amortized using the straight-line method over their estimated lives, ranging from 8-10 years.
Asset Impairment Charges | Asset Impairment Charges Long-lived Assets and Definite-lived Intangible Assets - we review our long-lived assets and definite-lived intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. When evaluating long-lived assets for potential impairment, we first compare the carrying value of the asset to the estimated future cash flows (undiscounted and without interest charges - plus proceeds expected from disposition, if any). If the estimated undiscounted cash flows are less than the carrying value of the asset, we calculate an impairment loss. The impairment loss calculation compares the carrying value of the asset to the asset’s estimated fair value. When we recognize an impairment loss, the carrying amount of the asset is reduced to estimated fair value based on discounted cash flows, quoted market prices or other valuation techniques. Assets to be disposed of are reported at the lower of the carrying amount of the asset or fair value less costs to sell. We review retail store assets for potential impairment based on historical cash flows, lease termination provisions and expected future retail store operating results. If we recognize an impairment loss for a depreciable long-lived asset, the adjusted carrying amount of the asset becomes its new cost basis and will be depreciated (amortized) over the remaining useful life of that asset. Goodwill and Indefinite-lived Intangible Assets - goodwill and indefinite-lived intangible assets are not amortized but are tested for impairment annually or when there are indicators of impairment using a fair value approach. The Financial Accounting Standards Board's (FASB) guidance allows us to perform either a quantitative assessment or a qualitative assessment before calculating the fair value of a reporting unit. We have elected to perform the quantitative assessment. The quantitative goodwill impairment test is a two-step process. The first step is a comparison of the fair value of the reporting unit with its carrying amount, including goodwill. If this step reflects impairment, then the loss would be measured as the excess of recorded goodwill over its implied fair value. Implied fair value is the excess of fair value of the reporting unit over the fair value of all identified assets and liabilities. Fair value is determined using a market-based approach utilizing widely accepted valuation techniques, including quoted market prices and our market capitalization. Indefinite-lived intangible assets are assessed for impairment by comparing the carrying value of an asset with its fair value. If the carrying value exceeds fair value, an impairment loss is recognized in an amount equal to the excess. Based on our 2018 assessments, we determined there was no impairment.
Warranty Liabilities | Warranty Liabilities We provide a limited warranty on most of the products we sell. The estimated warranty costs, which are expensed at the time of sale and included in cost of sales, are based on historical trends and warranty claim rates incurred by us and are adjusted for any current trends as appropriate. The majority of our warranty claims are incurred within the first year. Our warranty liability contains uncertainties because our warranty obligations cover an extended period of time and require management to make estimates for claim rates and the projected cost of materials and freight associated with sending replacement parts to customers. We regularly assess and adjust the estimate of accrued warranty claims by updating claims rates for actual trends and projected claim costs. We classify as non-current those estimated warranty costs expected to be paid out in greater than one year. The activity in the accrued warranty liabilities account was as follows (in thousands):
|  | 2018 |  |  | 2017 |  |  | 2016 |
Balance at beginning of period |  | $ | 9,320 |  |  | $ | 8,633 |  |  | $ | 10,028 |
Additions charged to costs and expenses for current-year sales |  |  | 12,385 |  |  |  | 12,214 |  |  |  | 9,034 |
Deductions from reserves |  |  | (11,743 | ) |  |  | (10,752 | ) |  |  | (10,016 | )
Changes in liability for pre-existing warranties during the current year, including expirations |  |  | 427 |  |  |  | (775 | ) |  |  | (413 | )
Balance at end of period |  | $ | 10,389 |  |  | $ | 9,320 |  |  | $ | 8,633 |
Fair Value Measurements | Fair Value Measurements Fair value measurements are reported in one of three levels based on the lowest level of significant input used:
• | Level 1 – observable inputs such as quoted prices in active markets;
• | Level 2 – inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and
• | Level 3 – unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.
We generally estimate fair value of long-lived assets, including our retail stores, using the income approach, which we base on estimated future cash flows (discounted and with interest charges). The inputs used to determine fair value relate primarily to future assumptions regarding sales volumes, gross profit rates, retail store operating expenses and applicable probability weightings regarding future alternative uses. These inputs are categorized as Level 3 inputs under the fair value measurements guidance. The inputs used represent management’s assumptions about what information market participants would use in pricing the assets and are based upon the best information available at the balance sheet date.
Dividends | Dividends We are not restricted from paying cash dividends under our credit agreement so long as we are not in default under the credit agreement, our leverage ratio (as defined in our credit agreement) after giving effect to such restricted payments (as defined in our credit agreement) would not exceed 3.75:1.00 and no default or event of default (as defined in our credit agreement) would result therefrom. However, we have not historically paid, and have no current plans to pay, cash dividends on our common stock.
Revenue Recognition | Revenue Recognition We recognize revenue when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. Revenue recognized excludes sales taxes. Amounts billed to customers for delivery and setup are included in net sales. For most products, we receive payment before or promptly after, the products or services are delivered to the customer. Our beds sold with SleepIQ technology contain multiple performance obligations including the bed and SleepIQ hardware and software. We analyze our multiple performance obligation(s) to determine whether they are distinct and can be separated or whether they must be accounted for as a single performance obligation. We determined that the beds sold with the SleepIQ technology have two performance obligations consisting of: (i) the bed; and (ii) SleepIQ hardware and software. SleepIQ hardware and software are not separable as the hardware and related software are not sold separately and the software is integral to the hardware's functionality. We determine the transaction price for multiple performance obligations based on their relative standalone selling prices. The performance obligation related to the bed is satisfied at a point in time. The performance obligation related to SleepIQ technology is satisfied over time based on the ongoing access and usage by the customer of software essential to the functionality of SleepIQ technology. The deferred revenue and costs related to SleepIQ technology are recognized on a straight-line basis over the product's estimated life of four years because our inputs are generally expended evenly throughout the performance period. We accept sales returns during a 100-night trial period. Accrued sales returns represent a refund liability for the amount of consideration that we do not expect to be entitled to because it will be refunded to customers. The refund liability estimate is based on historical return rates and is adjusted for any current trends as appropriate. Each reporting period we remeasure the liability to reflect changes in the estimate, with a corresponding adjustment to net sales.
Expenses | The following tables summarize the primary costs classified in each major expense category (the classification of which may vary within our industry):
Cost of Sales |  | Sales & Marketing
• Costs associated with purchasing, manufacturing, shipping, handling and delivering our products to our retail stores and customers; • Physical inventory losses, scrap and obsolescence; • Related occupancy and depreciation expenses; • Costs associated with returns and exchanges; and • Estimated costs to service customer warranty claims. |  | • Advertising, marketing and media production; • Marketing and selling materials such as brochures, videos, websites, customer mailings and in-store signage; • Payroll and benefits for sales and customer service staff; • Store occupancy costs; • Store depreciation expense; • Credit card processing fees; and • Promotional financing costs.
G&A |  | R&D(1)
• Payroll and benefit costs for corporate employees, including information technology, legal, human resources, finance, sales and marketing administration, investor relations and risk management; • Occupancy costs of corporate facilities; • Depreciation related to corporate assets; • Information hardware, software and maintenance; • Insurance; • Investor relations costs; and • Other overhead costs. |  | • Internal labor and benefits related to research and development activities; • Outside consulting services related to research and development activities; and • Testing equipment related to research and development activities. __________ (1) Costs incurred in connection with R&D are charged to expense as incurred.
Operating Lesses | Operating 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. Our retail store leases generally provide for an initial lease term of five to 10 years. In addition, our mall-based retail store leases may require payment of contingent rent based on net sales in excess of certain thresholds. Certain retail store leases may contain options to extend the term of the original lease. Minimum rent expense, which excludes contingent rents, is recognized on a straight-line basis over the lease term, after consideration of rent escalations and rent holidays. We record any difference between the straight-line rent amounts and amounts payable under the leases as part of deferred rent, in other current liabilities or other non-current liabilities, as appropriate. 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. Deferred rent is included in our consolidated balance sheets as follows (in thousands):
|  | December 29, 2018 |  |  | December 30, 2017 |
Deferred rent included in: |  |  |  |  |  |  |  |
Other current liabilities |  | $ | 1,408 |  |  | $ | 1,447 |
Other non-current liabilities |  |  | 11,452 |  |  |  | 9,555 |
|  | $ | 12,860 |  |  | $ | 11,002 |
Contingent rent expense is recorded when it is probable the expense has been incurred and the amount is reasonably estimable. Future payments for real estate taxes and certain building operating expenses for which we are obligated are not included in minimum lease payments. Leasehold improvements that are funded by landlord incentives or allowances under an operating lease are recorded as deferred lease incentives, in other current liabilities or other non-current liabilities, as appropriate and amortized as reductions to rent expense over the lease term. Deferred lease incentives are included in our consolidated balance sheets as follows (in thousands):
|  | December 29, 2018 |  |  | December 30, 2017 |
Deferred lease incentives included in: |  |  |  |  |  |  |  |
Other current liabilities |  | $ | 2,842 |  |  | $ | 2,784 |
Other non-current liabilities |  |  | 11,930 |  |  |  | 9,688 |
|  | $ | 14,772 |  |  | $ | 12,472 |
Pre-Opening Costs | Pre-Opening Costs Costs associated with the start-up and promotion of new retail store openings are expensed as incurred.
Advertising Costs | Advertising Costs We incur advertising costs associated with print, digital and broadcast advertisements. Advertising costs are charged to expense when the ad first runs. Advertising expense was $210 million, $194 million and $190 million in 2018, 2017 and 2016, respectively. Advertising costs deferred and included in prepaid expenses in our consolidated balance sheets were $2 million and $2 million as of December 29, 2018 and December 30, 2017, respectively.
Insurance | Insurance We are self-insured for certain losses related to health and workers’ compensation claims, although we obtain third-party insurance coverage to limit exposure to these claims. We estimate our self-insured liabilities using a number of factors including historical claims experience and analysis of incurred but not reported claims. Our self-insurance liability was $8 million and $9 million at December 29, 2018 and December 30, 2017, respectively. At December 29, 2018, and December 30, 2017, $5 million and $6 million, respectively, were included in compensation and benefits in our consolidated balance sheets and $3 million and $3 million, respectively, were included in other non-current liabilities in our consolidated balance sheets.
Software Capitalization | Software Capitalization For software developed or obtained for internal use, we capitalize direct external costs associated with developing or obtaining internal-use software. In addition, we capitalize certain payroll and payroll-related costs for employees who are directly involved with the development of such applications. Capitalized costs related to internal-use software under development are treated as construction-in-progress until the program, feature or functionality is ready for its intended use, at which time depreciation commences. We expense any data conversion or training costs as incurred. We capitalize costs incurred with the implementation of a cloud computing arrangement, that is a service contract, consistent with our policy for software developed or obtained for internal use. The capitalized implementation costs of cloud computing arrangements are expensed over the term of the cloud computing arrangement in the same line item in the statement of operations as the associated fees.
Share-Based Compensation | Stock-Based Compensation We compensate officers, directors and key employees with stock-based compensation under stock plans approved by our shareholders and administered under the supervision of our Board of Directors (Board). At December 29, 2018, a total of 2.3 million shares were available for future grant. These plans include non-qualified stock options and stock awards. We record stock-based compensation expense based on the award’s fair value at the grant date and the awards that are expected to vest. We recognize stock-based compensation expense over the period during which an employee is required to provide services in exchange for the award. We reduce compensation expense by estimated forfeitures. Forfeitures are estimated using historical experience and projected employee turnover. Beginning in 2017, we include, as part of cash flows from operating activities, the benefit of tax deductions in excess of recognized stock-based compensation expense. In addition, excess tax benefits or deficiencies that in prior years were recorded in additional paid-in capital are now recorded as discrete adjustments to income tax expense. Stock Options - stock option awards are granted at exercise prices equal to the closing price of our stock on the grant date. Generally, options vest proportionally over three years and expire after 10 years. Compensation expense is recognized ratably over the vesting period. We determine the fair value of stock options granted and the resulting compensation expense at the date-of-grant using the Black-Scholes-Merton option-pricing model. Descriptions of significant assumptions used to estimate the expected volatility, risk-free interest rate and expected term are as follows: Expected Volatility – expected volatility was determined based on implied volatility of our traded options and historical volatility of our stock price. Risk-Free Interest Rate – the risk-free interest rate was based on the implied yield available on U.S. Treasury zero-coupon issues at the date of grant with a term equal to the expected term. Expected Term – expected term represents the period that our stock-based awards are expected to be outstanding and was determined based on historical experience and anticipated future exercise patterns, giving consideration to the contractual terms of unexercised stock-based awards. Stock Awards - we issue stock awards to certain employees in conjunction with our stock-based compensation plan. The stock awards generally vest over three years based on continued employment (time-based). Compensation expense related to stock awards, except for stock awards with a market condition, is determined on the grant date based on the publicly quoted closing price of our common stock and is charged to earnings on a straight-line basis over the vesting period. Stock awards with a market condition are valued using a Monte Carlo simulation model. The significant assumptions used to estimate the expected volatility and risk-free interest rate are similar to those described above in Stock Options. Certain time-based stock awards have a performance condition (performance-based). The final number of shares earned for performance-based stock awards and the related compensation expense is adjusted up or down to the extent the performance target is met as of the last day of the performance period. The actual number of shares that will ultimately be awarded range from 0% - 200% of the targeted amount for the 2018, 2017 and 2016 awards. We evaluate the likelihood of meeting the performance targets at each reporting period and adjust compensation expense, on a cumulative basis, based on the expected achievement of each of the performance targets. For performance-based stock awards granted in 2018, 2017 and 2016, the performance targets are based on growth in net sales and in operating profit, and the performance periods are fiscal 2018 through 2020, 2017 through 2019, and fiscal 2016 through 2018, respectively.
Income Taxes | Income Taxes We recognize deferred tax assets and liabilities for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is established for any portion of deferred tax assets that are not considered more likely than not to be realized. We evaluate all available positive and negative evidence, including our forecast of future taxable income, to assess the need for a valuation allowance on our deferred tax assets. We record a liability for unrecognized tax benefits from uncertain tax positions taken, or expected to be taken, in our tax returns. We follow a two-step approach to recognizing and measuring uncertain tax positions. The first step is to evaluate the tax position for recognition by determining if the available evidence indicates it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount which is more than 50% likely of being realized upon ultimate settlement. We consider many factors when evaluating and estimating our tax positions and tax benefits, which may require periodic adjustments, and may not accurately forecast actual outcomes. We classify net interest and penalties related to income taxes as a component of income tax expense in our consolidated statements of operations.
Net Income Per Share | Net Income Per Share We calculate basic net income per share by dividing net income by the weighted-average number of common shares outstanding during the period. We calculate diluted net income per share based on the weighted-average number of common shares outstanding adjusted by the number of potentially dilutive common shares as determined by the treasury stock method. Potentially dilutive shares consist of stock options and stock awards.
Sources of Supply | Sources of Supply We currently obtain materials and components used to produce our beds from outside sources. As a result, we are dependent upon suppliers that in some instances, are our sole source of supply. We are continuing our efforts to dual-source key components. The failure of one or more of our suppliers to provide us with materials or components on a timely basis could significantly impact our consolidated results of operations and net income per share. We believe we can obtain these raw materials and components from other sources of supply in the ordinary course of business, although an unexpected loss of supply over a short period of time may not allow us to replace these sources in the ordinary course of business.
New Accounting Pronouncements | New Accounting Pronouncements Recently Adopted Accounting Guidance Adoption of ASC Topic 230, Restricted Cash Effective December 31, 2017, we adopted ASC Topic 230, Restricted Cash, which requires amounts generally described as restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the total beginning and ending amounts for the periods shown on the statement of cash flows. Amounts for prior periods have been retrospectively adjusted to conform to the current period presentation. Adoption of ASC Topic 606, Revenue from Contracts with Customers On December 31, 2017, we adopted ASC Topic 606, Revenue from Contracts with Customers, using the modified retrospective method applied to those contracts which were not completed as of December 30, 2017. Results for reporting periods beginning after December 30, 2017 are presented under the new guidance, while prior period amounts are not restated. The cumulative effect of the changes made to our consolidated balance sheet as of December 31, 2017 resulting from the adoption of the new revenue guidance was not material and did not impact opening retained earnings. The impact on the timing of net sales for 2018, as a result of applying the new guidance, was not material. Practical expedients and exemptions permissible under ASC Topic 606 that we elected are as follows: we do not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less; and (ii) contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed. See Note 9, Revenue Recognition, for further details regarding our revenue recognition policy. Accounting Guidance Issued but Not Yet Adopted as of December 29, 2018 We are the lessee under various agreements for facilities, equipment and vehicles that are currently accounted for as operating leases. In February 2016, the FASB issued ASC Topic 842, Leases, that requires most leases to be recognized on the balance sheet and expands disclosure requirements. Leases will be classified as finance or operating, with classification affecting the pattern and classification of expense recognition in the income statement. This new guidance is effective for us beginning December 30, 2018 (fiscal 2019). The provisions of this new guidance require a modified-retrospective approach, with elective reliefs. The new guidance will apply to all leases existing at the date of initial application. We have the option to choose either (1) the effective date, or (2) the beginning of the earliest comparative period presented in the financial statements as the date of initial application. We expect to adopt the new standard using the effective date option. The new guidance establishes a right-of-use model (ROU) that requires a lessee to recognize a ROU asset and lease liability on the balance sheet for all leases with a term longer than 12 months. On adoption, we expect to recognize additional lease liabilities and corresponding ROU assets of approximately $300 million based on the present value of the remaining minimum rental payments for existing operating leases. The new guidance provides a number of optional practical expedients in transition. We expect to elect the package of practical expedients, which permits us to not reassess under the new standard our prior conclusions about lease identification, lease classification and initial direct costs. We do not expect to elect the use of hindsight. The new guidance also provides practical expedients for an entity’s ongoing accounting. We expect to elect the short-term lease recognition exemption for all leases that qualify, primarily small equipment leases. This means, for those leases that qualify, we will not recognize ROU assets or lease liabilities, and this includes not recognizing ROU assets or lease liabilities for existing short-term leases of those assets in transition. We also expect to elect the practical expedient option to not separate lease and non-lease components for all of our leases. We will be providing significant new disclosures about our leasing activities and have implemented a new lease accounting system in connection with the adoption. We also expect that adoption of the new guidance will require changes to our internal controls over financial reporting. We continue to evaluate the effect of the new standard on our consolidated financial statements and related disclosures.
Repurchases of Common Stock | There is no expiration date governing the period over which we can repurchase shares. Any repurchased shares are constructively retired and returned to an unissued status. The cost of stock repurchases is first charged to additional paid-in-capital. Once additional paid-in capital is reduced to zero, any additional amounts are charged to retained earnings.

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