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Summary of Significant Accounting Policies | 12 Months Ended
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Sep. 02, 2018
Accounting Policies [Abstract] |
Summary of Significant Policies | Note 1—Summary of Significant Accounting Policies Description of Business Costco Wholesale Corporation (Costco or the Company), a Washington corporation, and its subsidiaries operate membership warehouses based on the concept that offering members low prices on a limited selection of nationally-branded and private-label products in a wide range of merchandise categories will produce high sales volumes and rapid inventory turnover. At September 2, 2018, Costco operated 762 warehouses worldwide: 527 United States (U.S.) locations (in 44 U.S. states, Washington, D.C., and Puerto Rico), 100 Canada locations, 39 Mexico locations, 28 United Kingdom (U.K.) locations, 26 Japan locations, 15 Korea locations, 13 Taiwan locations, 10 Australia locations, two Spain locations, one Iceland location, and one France location. The Company operates e-commerce websites in the U.S., Canada, Mexico, U.K., Korea, and Taiwan. Basis of Presentation The consolidated financial statements include the accounts of Costco Wholesale Corporation, its wholly-owned subsidiaries, and subsidiaries in which it has a controlling interest. The Company reports noncontrolling interests in consolidated entities as a component of equity separate from the Company’s equity. All material inter-company transactions between and among the Company and its consolidated subsidiaries have been eliminated in consolidation. The Company’s net income excludes income attributable to the noncontrolling interest in Taiwan. During the first quarter of 2018, Costco purchased its former joint-venture partner's remaining equity interest in its Korean operations. Unless otherwise noted, references to net income relate to net income attributable to Costco. Fiscal Year End The Company operates on a 52/53 week fiscal year basis with the fiscal year ending on the Sunday closest to August 31. References to 2018 and 2016 relate to the 52-week fiscal years ended September 2, 2018, and August 28, 2016, respectively. References to 2017 relate to the 53-week fiscal year ended September 3, 2017. Use of Estimates The preparation of financial statements in conformity with U.S. generally accepted accounting principles (U.S. GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates and assumptions. Cash and Cash Equivalents The Company considers as cash and cash equivalents all cash on deposit, highly liquid investments with a maturity of three months or less at the date of purchase, and proceeds due from credit and debit card transactions with settlement terms of up to four days. Credit and debit card receivables were $1,348 and $1,255 at the end of 2018 and 2017, respectively. The Company provides for the daily replenishment of major bank accounts as checks are presented. Included in accounts payable at the end of 2018 and 2017 are $463 and $383, respectively, representing the excess of outstanding checks over cash on deposit at the banks on which the checks were drawn. Short-Term Investments In general, short-term investments have a maturity at the date of purchase of three months to five years. Investments with maturities beyond five years may be classified, based on the Company’s determination, as short-term based on their highly liquid nature and because they represent the investment of cash that is available for current operations. Short-term investments classified as available-for-sale are recorded at fair value using the specific identification method with the unrealized gains and losses reflected in accumulated other comprehensive income (loss) until realized. Realized gains and losses from the sale of available-for-sale securities, if any, are determined on a specific identification basis and are recorded in interest income and other, net in the consolidated statements of income. Short-term investments classified as held-to-maturity are financial instruments that the Company has the intent and ability to hold to maturity and are reported net of any related amortization and are not remeasured to fair value on a recurring basis. The Company periodically evaluates unrealized losses in its investment securities for other-than-temporary impairment, using both qualitative and quantitative criteria. In the event a security is deemed to be other-than-temporarily impaired, the Company recognizes the loss in interest income and other, net in the consolidated statements of income. Fair Value of Financial Instruments The Company accounts for certain assets and liabilities at fair value. The carrying value of the Company’s financial instruments, including cash and cash equivalents, receivables and accounts payable, approximate fair value due to their short-term nature or variable interest rates. See Notes 2, 3, and 4 for the carrying value and fair value of the Company’s investments, derivative instruments, and fixed-rate debt, respectively. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is estimated by applying a fair value hierarchy, which requires maximizing the use of observable inputs when measuring fair value. The three levels of inputs are: Level 1: Quoted market prices in active markets for identical assets or liabilities. Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data. Level 3: Significant unobservable inputs that are not corroborated by market data. The Company’s valuation techniques used to measure the fair value of money market mutual funds are based on quoted market prices, such as quoted net asset values published by the fund as supported in an active market. Valuation methodologies used to measure the fair value of all other non-derivative financial instruments are based on independent external valuation information. The pricing process uses data from a variety of independent external valuation information providers, including trades, bid price or spread, two-sided markets, quotes, benchmark curves including but not limited to treasury benchmarks and Libor and swap curves, discount rates, and market data feeds. All are observable in the market or can be derived principally from or corroborated by observable market data. The Company reports transfers in and out of Levels 1, 2, and 3, as applicable, using the fair value of the individual securities as of the beginning of the reporting period in which the transfer(s) occurred. Current financial liabilities have fair values that approximate their carrying values. Long-term financial liabilities include the Company's long-term debt, which are recorded on the balance sheet at issuance price and adjusted for unamortized discounts or premiums and debt issuance costs, and are being amortized to interest expense over the term of the loan. The estimated fair value of the Company's long-term debt is based primarily on reported market values, recently completed market transactions, and estimates based upon interest rates, maturities, and credit. Receivables, Net Receivables consist primarily of vendor, reinsurance, credit card incentive, third-party pharmacy and other receivables. Vendor receivables include coupons, volume rebates or other purchase discounts. Balances are generally presented on a gross basis, separate from any related payable due. In certain circumstances, these receivables may be settled against the related payable to that vendor, in which case the receivables are presented on a net basis. Reinsurance receivables are held by the Company’s wholly-owned captive insurance subsidiary and primarily represent amounts ceded through reinsurance arrangements gross of the amounts assumed under reinsurance, which are presented within other current liabilities in the consolidated balance sheets. Credit card incentive receivables primarily represent amounts earned under the co-branded credit card arrangement in the U.S. Third-party pharmacy receivables generally relate to amounts due from members’ insurers. Other receivables primarily consist of amounts due from governmental entities, mostly tax-related items. Receivables are recorded net of an allowance for doubtful accounts. The allowance is based on historical experience and application of the specific identification method. Write-offs of receivables were immaterial for fiscal years 2018, 2017, and 2016. Merchandise Inventories Merchandise inventories consist of the following:
| 2018 |  | 2017
United States | $ | 8,081 |  |  | $ | 7,091 |
Canada | 1,189 |  |  | 1,040 |
Other International | 1,770 |  |  | 1,703 |
Merchandise inventories | $ | 11,040 |  |  | $ | 9,834 |
Merchandise inventories are stated at the lower of cost or market. U.S. merchandise inventories are valued by the cost method of accounting, using the last-in, first-out (LIFO) basis. The Company believes the LIFO method more fairly presents the results of operations by more closely matching current costs with current revenues. The Company records an adjustment each quarter, if necessary, for the projected annual effect of inflation or deflation, and these estimates are adjusted to actual results determined at year-end, after actual inflation or deflation rates and inventory levels for the year have been determined. Canadian and Other International merchandise inventories are predominantly valued using the cost and retail inventory methods, respectively, using the first-in, first-out (FIFO) basis. As of September 2, 2018 and September 3, 2017, U.S. merchandise inventories valued at LIFO approximated FIFO after considering the lower of cost or market principle. Due to net deflation, a benefit of $64 was recorded to merchandise costs in 2016. The Company provides for estimated inventory losses between physical inventory counts as a percentage of net sales, using estimates based on the Company’s experience. The provision is adjusted periodically to reflect physical inventory counts, which generally occur in the second and fourth fiscal quarters. Inventory cost, where appropriate, is reduced by estimates of vendor rebates when earned or as the Company progresses towards earning those rebates, provided that they are probable and reasonably estimable. Property and Equipment Property and equipment are stated at cost. In general, new building additions are classified into components, each with an estimated useful life, generally five to fifty years for buildings and improvements and three to twenty years for equipment and fixtures. Depreciation and amortization expense is computed using the straight-line method over estimated useful lives or the lease term, if shorter. Leasehold improvements made after the beginning of the initial lease term are depreciated over the shorter of the estimated useful life of the asset or the remaining term of the initial lease plus any renewals that are reasonably assured at the date the leasehold improvements are made. The Company capitalizes certain computer software and software development costs incurred in developing or obtaining computer software for internal use. These costs are included in equipment and fixtures and amortized on a straight-line basis over the estimated useful lives of the software, generally three to seven years. Repair and maintenance costs are expensed when incurred. Expenditures for remodels, refurbishments and improvements that add to or change the way an asset functions or that extend the useful life are capitalized. Assets that were removed during the remodel, refurbishment or improvement are retired. Assets classified as held-for-sale at the end of 2018 and 2017 were immaterial. The Company evaluates long-lived assets for impairment on an annual basis, when relocating or closing a facility, or when events or changes in circumstances may indicate the carrying amount of the asset group, generally an individual warehouse, may not be fully recoverable. For asset groups held and used, including warehouses to be relocated, the carrying value of the asset group is considered recoverable when the estimated future undiscounted cash flows generated from the use and eventual disposition of the asset group exceed the respective carrying value. In the event that the carrying value is not considered recoverable, an impairment loss is recognized for the asset group to be held and used equal to the excess of the carrying value above the estimated fair value of the asset group. For asset groups classified as held-for-sale (disposal group), the carrying value is compared to the disposal group’s fair value less costs to sell. The Company estimates fair value by obtaining market appraisals from third party brokers or using other valuation techniques. There were no impairment charges recognized in 2018, 2017 or 2016. Insurance/Self-Insurance Liabilities The Company is predominantly self-insured for employee health care benefits, workers’ compensation, general liability, property damage, directors’ and officers’ liability, vehicle liability, and inventory loss. Insurance coverage is maintained in certain instances to limit the exposure arising from catastrophic events. It uses different mechanisms including a wholly-owned captive insurance subsidiary (the captive) and participates in a reinsurance program. Liabilities associated with the risks that are retained by the Company are not discounted and are estimated, in part, by considering historical claims experience, demographic factors, severity factors, and other actuarial assumptions. The estimated accruals for these liabilities could be significantly affected if future occurrences and claims differ from these assumptions and historical trends. At the end of 2018 and 2017, these insurance liabilities were $1,148 and $1,059 in the aggregate, respectively, and were included in accrued salaries and benefits and other current liabilities in the consolidated balance sheets, classified based on their nature. The captive receives direct premiums, which are netted against the Company’s premium costs in selling, general and administrative expenses, in the consolidated statements of income. The captive participates in a reinsurance program that includes other third-party participants. The reinsurance agreement is one year in duration, and new agreements are entered into by each participant at their discretion at the commencement of the next calendar year. The participant agreements and practices of the reinsurance program limit a participating members’ individual risk. Income statement adjustments related to the reinsurance program and related impacts to the consolidated balance sheets are recognized as information becomes known. In the event the Company leaves the reinsurance program, the Company retains its primary obligation to the policyholders for prior activity. Derivatives The Company is exposed to foreign-currency exchange-rate fluctuations in the normal course of business. It manages these fluctuations, in part, through the use of forward foreign-exchange contracts, seeking to economically hedge the impact of fluctuations of foreign exchange on known future expenditures denominated in a non-functional foreign-currency. The contracts relate primarily to U.S. dollar merchandise inventory expenditures made by the Company’s international subsidiaries with functional currencies other than the U.S. dollar. Currently, these contracts do not qualify for derivative hedge accounting. The Company seeks to mitigate risk with the use of these contracts and does not intend to engage in speculative transactions. Some of these contracts contain credit-risk-related contingent features that require settlement of outstanding contracts upon certain triggering events. At the end of 2018 and 2017, the aggregate fair value amounts of derivative instruments in a net liability position and the amount needed to settle the instruments immediately if the credit-risk-related contingent features were triggered were immaterial. The aggregate notional amounts of open, unsettled forward foreign-exchange contracts were $717 and $637 at the end of 2018 and 2017, respectively. See Note 3 for information on the fair value of unsettled forward foreign-exchange contracts at the end of 2018 and 2017. The unrealized gains or losses recognized in interest income and other, net in the accompanying consolidated statements of income relating to the net changes in the fair value of unsettled forward foreign-exchange contracts were immaterial in 2018, 2017, and 2016. The Company is exposed to fluctuations in prices for energy, particularly electricity and natural gas, which it seeks to partially mitigate through the use of fixed-price contracts for certain of its warehouses and other facilities, primarily in the U.S. and Canada. The Company also enters into variable-priced contracts for some purchases of natural gas, in addition to fuel for its gas stations, on an index basis. These contracts meet the characteristics of derivative instruments, but generally qualify for the “normal purchases or normal sales” exception under authoritative guidance and require no mark-to-market adjustment. Foreign Currency The functional currencies of the Company’s international subsidiaries are the local currency of the country in which the subsidiary is located. Assets and liabilities recorded in foreign currencies are translated at the exchange rate on the balance sheet date. Translation adjustments are recorded in accumulated other comprehensive loss. Revenues and expenses of the Company’s consolidated foreign operations are translated at average exchange rates prevailing during the year. The Company recognizes foreign-currency transaction gains and losses related to revaluing or settling monetary assets and liabilities denominated in currencies other than the functional currency in interest income and other, net in the accompanying consolidated statements of income. Generally, these include the U.S. dollar cash and cash equivalents and the U.S. dollar payables of consolidated subsidiaries revalued to their functional currency. Also included are realized foreign-currency gains or losses from settlements of forward foreign-exchange contracts. These items were immaterial for 2018 and 2017 and resulted in net gains of$38 for 2016. Revenue Recognition The Company generally recognizes sales, which include gross shipping fees where applicable, net of returns, at the time the member takes possession of merchandise or receives services. When the Company collects payments from members prior to the transfer of ownership of merchandise or the performance of services, the amounts received are generally recorded as deferred sales, included in other current liabilities in the consolidated balance sheets, until the sale or service is completed. The Company reserves for estimated sales returns based on historical trends in merchandise returns and reduces sales and merchandise costs accordingly. The sales returns reserve is based on an estimate of the net realizable value of merchandise inventories expected to be returned. Amounts collected from members for sales or value added taxes are recorded on a net basis. Generally, when Costco is the primary obligor, is subject to inventory risk, has latitude in establishing prices and selecting suppliers, can influence product or service specifications, or has several but not all of these indicators, revenue is recorded on a gross basis. It otherwise records the net amounts earned, which is reflected in net sales. The Company accounts for membership fee revenue, net of refunds, on a deferred basis, ratably over the one-year membership. The Company's Executive members qualify for a 2% reward on qualified purchases (up to a maximum reward of approximately $1,000 per year), which can be redeemed only at Costco warehouses. The Company accounts for this reward as a reduction in sales. The sales reduction and corresponding liability (classified as accrued member rewards in the consolidated balance sheets) are computed after giving effect to the estimated impact of non-redemptions, based on historical data. The net reduction in sales was $1,394, $1,281, and $1,172 in 2018, 2017, and 2016, respectively. Merchandise Costs Merchandise costs consist of the purchase price or manufacturing costs of inventory sold, inbound and outbound shipping charges and all costs related to the Company’s depot operations, including freight from depots to selling warehouses, and are reduced by vendor consideration. Merchandise costs also include salaries, benefits, depreciation, and utilities in fresh foods and certain ancillary departments. Vendor Consideration The Company has agreements to receive funds from vendors for coupons and a variety of other programs. These programs are evidenced by signed agreements that are reflected in the carrying value of the inventory when earned or as the Company progresses towards earning the rebate or discount, and as a component of merchandise costs as the merchandise is sold. Other vendor consideration is generally recorded as a reduction of merchandise costs upon completion of contractual milestones, terms of the related agreement, or by another systematic approach. Selling, General and Administrative Expenses Selling, general and administrative expenses consist primarily of salaries, benefits and workers’ compensation costs for warehouse employees (other than fresh foods departments and certain ancillary businesses) as well as all regional and home office employees, including buying personnel. Selling, general and administrative expenses also include substantially all building and equipment depreciation, stock compensation expense, utilities, credit and debit card processing fees, as well as other operating costs incurred to support warehouse operations. Retirement Plans The Company's 401(k) retirement plan is available to all U.S. employees who have completed 90 days of employment. The plan allows participants to make wage deferral contributions, a portion of which the Company matches. In addition, the Company provides each eligible participant an annual discretionary contribution. The Company also has a defined contribution plan for Canadian employees and contributes a percentage of each employee's wages. Certain subsidiaries in the Company's Other International operations have defined benefit and defined contribution plans that are not material. Amounts expensed under all plans were $578, $543, and $489 for 2018, 2017, and 2016, respectively, and are predominantly included in selling, general and administrative expenses in the accompanying consolidated statements of income. Stock-Based Compensation Restricted stock units (RSUs) granted to employees generally vest over five years and allow for quarterly vesting of the pro-rata number of stock-based awards that would vest on the next anniversary of the grant date in the event of retirement or voluntary termination. Actual forfeitures are recognized as they occur. Compensation expense for stock-based awards is predominantly recognized using the straight-line method over the requisite service period for the entire award. Awards for employees and non-employee directors provide for accelerated vesting of a portion of outstanding shares based on cumulative years of service with the Company. Compensation expense for the accelerated shares is recognized upon achievement of the long-service term. The cumulative amount of compensation cost recognized at any point in time equals at least the portion of the grant-date fair value of the award that is vested at that date. The fair value of RSUs is calculated as the market value of the common stock on the measurement date less the present value of the expected dividends forgone during the vesting period. Stock-based compensation expense is predominantly included in selling, general and administrative expenses in the consolidated statements of income. Certain stock-based compensation costs are capitalized or included in the cost of merchandise. See Note 7 for additional information on the Company’s stock-based compensation plans. Leases The Company leases land and/or buildings at warehouses and certain other office and distribution facilities, primarily under operating leases. Operating leases expire at various dates through 2064, with the exception of one lease in the U.K., which expires in 2151. These leases generally contain one or more of the following options, which the Company can exercise at the end of the initial lease term: (a) renewal of the lease for a defined number of years at the then-fair market rental rate or rate stipulated in the lease agreement; (b) purchase of the property at the then-fair market value; or (c) right of first refusal in the event of a third-party purchase offer. The Company accounts for its lease expense with free rent periods and step-rent provisions on a straight-line basis over the original term of the lease and any extension options that the Company more likely than not expects to exercise, from the date the Company has control of the property. Certain leases provide for periodic rental increases based on price indices, or the greater of minimum guaranteed amounts or sales volume. The Company has capital leases for certain warehouse locations, expiring at various dates through 2059. Capital lease assets are included in land and buildings and improvements in the accompanying consolidated balance sheets. Amortization expense on capital lease assets is recorded as depreciation expense and is included in selling, general and administrative expenses. Capital lease liabilities are recorded at the lesser of the estimated fair market value of the leased property or the net present value of the aggregate future minimum lease payments and are included in other current liabilities and other liabilities in the accompanying consolidated balance sheets. Interest on these obligations is included in interest expense in the consolidated statements of income. The Company records an asset and related financing obligation for the estimated construction costs under build-to-suit lease arrangements where it is considered the owner for accounting purposes, to the extent the Company is involved in the construction of the building or structural improvements or has construction risk prior to commencement of a lease. Upon occupancy, the Company assesses whether these arrangements qualify for sales recognition under the sale-leaseback accounting guidance. If the Company continues to be the deemed owner, it accounts for the arrangement as a financing lease. The Company’s asset retirement obligations (ARO) primarily relate to leasehold improvements that at the end of a lease must be removed. These obligations are recorded as a liability with an offsetting asset at the inception of the lease term based upon the estimated fair value of the costs to remove the leasehold improvements. These liabilities are accreted over time to the projected future value of the obligation using the Company’s incremental borrowing rate. The ARO assets are depreciated using the same depreciation method as the leasehold improvement assets and are included with buildings and improvements. Estimated ARO liabilities associated with these leases were immaterial at the end of 2018 and 2017, respectively, and are included in other liabilities in the accompanying consolidated balance sheets. Preopening Expenses Preopening expenses include costs for startup operations related to new warehouses and relocations, developments in new international markets, new manufacturing and distribution facilities, and expansions at existing warehouses and are expensed as incurred. Income Taxes The Company accounts for income taxes using the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributed to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and tax credits and loss carry-forwards. 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 and carry-forwards 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 when necessary to reduce deferred tax assets to amounts that are more likely than not expected to be realized. The timing and amounts of deductible and taxable items and the probability of sustaining uncertain tax positions requires significant judgment. The benefits of uncertain tax positions are recorded in the Company’s consolidated financial statements only after determining a more-likely-than-not probability that the uncertain tax positions will withstand challenge from tax authorities. When facts and circumstances change, the Company reassesses these probabilities and records any changes as appropriate. Net Income per Common Share Attributable to Costco The computation of basic net income per share uses the weighted average number of shares that were outstanding during the period. The computation of diluted net income per share uses the weighted average number of shares in the basic net income per share calculation plus the number of common shares that would be issued assuming vesting of all potentially dilutive common shares outstanding using the treasury stock method for shares subject to RSUs. Stock Repurchase Programs Repurchased shares of common stock are retired, in accordance with the Washington Business Corporation Act. The par value of repurchased shares is deducted from common stock and the excess repurchase price over par value is deducted by allocation to additional paid-in capital and retained earnings. The amount allocated to additional paid-in capital is the current value of additional paid-in capital per share outstanding and is applied to the number of shares repurchased. Any remaining amount is allocated to retained earnings. See Note 6 for additional information. Recent Accounting Pronouncements Adopted In March 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-09 related to the accounting for share-based payment transactions. The guidance relates to income taxes, forfeitures, and minimum statutory tax withholding requirements. The new standard was effective for fiscal years and interim periods within those years beginning after December 15, 2016, with early adoption permitted. The Company adopted this guidance at the beginning of its first quarter of fiscal year 2018. As a result, the Company recognized a net tax benefit in fiscal 2018 of $33 as part of its income tax provision in the accompanying consolidated statements of income, which includes the impact of the lower tax rate from the 2017 Tax Act. Previously, tax benefits associated with the release of employee RSUs were reflected in equity. These amounts are now reflected as cash flows from operations instead of cash flows from financing activities in the consolidated statements of cash flows on a prospective basis. Adoption of this guidance did not have a material impact on the consolidated balance sheets, consolidated statements of cash flows, or related disclosures. Recent Accounting Pronouncements Not Yet Adopted In May 2014, the FASB issued ASU 2014-09 providing for changes in the recognition of revenue from contracts with customers. The guidance converges the requirements for reporting revenue and requires disclosures sufficient to describe the nature, amount, timing, and uncertainty of revenue and cash flows arising from these contracts. The new standard is effective for fiscal years and interim periods within those years beginning after December 15, 2017. The Company plans to adopt this guidance at the beginning of its first quarter of fiscal 2019, using the modified retrospective approach through a cumulative effect adjustment to retained earnings. The Company has substantially completed its assessment of the new standard and it does not believe the impacts to be material to the Company's consolidated financial statements. The Company continues to evaluate the disclosure requirements related to the new standard. In February 2016, the FASB issued ASU 2016-02 which will require recognition on the balance sheet for the rights and obligations created by leases with terms greater than twelve months. The new standard is effective for fiscal years and interim periods within those years beginning after December 15, 2018, with early adoption permitted. The Company plans to adopt this guidance at the beginning of its first quarter of fiscal 2020 and plans to utilize the transition option which does not require application of the guidance to comparative periods in the year of adoption. While the Company continues to evaluate this standard and the effect on related disclosures, the primary effect of adoption will be recording right-of-use assets and corresponding lease obligations for current operating leases. The adoption is expected to have a material impact on the Company's consolidated balance sheets, but not on the consolidated statements of income or cash flows. Additionally, the Company is in the process of reviewing current accounting policies, changes to business processes, systems and controls to support adoption of the new standard, which includes implementing a new lease accounting system.

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