Costco Wholesale (COST) 10-Q 23 Dec 19 2020 Q1 Quarterly report Financial data

Cover

Cover - shares	3 Months Ended
	Nov. 24, 2019	Dec. 11, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Nov. 24, 2019
Document Transition Report	false
Entity File Number	0-20355
Entity Registrant Name	COSTCO WHOLESALE CORP /NEW
Entity Incorporation, State or Country Code	WA
Entity Tax Identification Number	91-1223280
Entity Address, Address Line One	999 Lake Drive
Entity Address, City or Town	Issaquah
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	98027
City Area Code	425
Local Phone Number	313-8100
Title of 12(b) Security	Common Stock, $.01 Par Value
Trading Symbol	COST
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		441,757,627
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Central Index Key	0000909832
Current Fiscal Year End Date	--08-30

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Nov. 24, 2019	Nov. 25, 2018
REVENUE
Total Revenue	$ 37,040	$ 35,069
OPERATING EXPENSES
Merchandise costs	32,233	30,623
Selling, general and administrative	3,732	3,475
Preopening expenses	14	22
Operating income	1,061	949
OTHER INCOME (EXPENSE)
Interest expense	(38)	(36)
Interest income and other, net	35	22
INCOME BEFORE INCOME TAXES	1,058	935
Provision for income taxes	202	158
Net income including noncontrolling interests	856	777
Net income attributable to noncontrolling interests	(12)	(10)
NET INCOME ATTRIBUTABLE TO COSTCO	$ 844	$ 767
NET INCOME PER COMMON SHARE ATTRIBUTABLE TO COSTCO:
Basic (in dollars per share)	$ 1.91	$ 1.75
Diluted (in dollars per share)	$ 1.90	$ 1.73
Shares used in calculation (000's)
Basic (shares)	441,818	439,157
Diluted (shares)	443,680	442,749
Net sales
REVENUE
Total Revenue	$ 36,236	$ 34,311
Membership fees
REVENUE
Total Revenue	$ 804	$ 758

Condensed Consolidated Statem_2

Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Nov. 24, 2019	Nov. 25, 2018
Statement of Comprehensive Income [Abstract]
NET INCOME INCLUDING NONCONTROLLING INTERESTS	$ 856	$ 777
Foreign-currency translation adjustment and other, net	125	(134)
Comprehensive income	981	643
Less: Comprehensive income attributable to noncontrolling interests	22	8
COMPREHENSIVE INCOME ATTRIBUTABLE TO COSTCO	$ 959	$ 635

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($)	Nov. 24, 2019	Sep. 01, 2019
CURRENT ASSETS
Cash and cash equivalents	$ 9,027,000,000	$ 8,384,000,000
Short-term investments	993,000,000	1,060,000,000
Receivables, net	1,711,000,000	1,535,000,000
Merchandise inventories	13,818,000,000	11,395,000,000
Other current assets	1,094,000,000	1,111,000,000
Total current assets	26,643,000,000	23,485,000,000
PROPERTY AND EQUIPMENT
Land	6,533,000,000	6,417,000,000
Buildings and improvements	17,732,000,000	17,136,000,000
Equipment and fixtures	8,243,000,000	7,801,000,000
Construction in progress	803,000,000	1,272,000,000
Less accumulated depreciation and amortization	(12,074,000,000)	(11,736,000,000)
Net property and equipment	21,237,000,000	20,890,000,000
Operating Lease, Right-of-Use Asset	2,597,000,000	0
OTHER ASSETS	954,000,000	1,025,000,000
TOTAL ASSETS	51,431,000,000	45,400,000,000
CURRENT LIABILITIES
Accounts payable	14,440,000,000	11,679,000,000
Accrued salaries and benefits	3,159,000,000	3,176,000,000
Accrued member rewards	1,193,000,000	1,180,000,000
Deferred membership fees	1,817,000,000	1,711,000,000
Current portion of long-term debt	1,700,000,000	1,699,000,000
Other current liabilities	3,956,000,000	3,792,000,000
Total current liabilities	26,265,000,000	23,237,000,000
LONG-TERM DEBT, excluding current portion	5,107,000,000	5,124,000,000
Operating Lease, Liability, Noncurrent	2,442,000,000	0
OTHER LIABILITIES	1,393,000,000	1,455,000,000
Total liabilities	35,207,000,000	29,816,000,000
EQUITY
Preferred stock $.01 par value; 100,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock $0.01 par value; 900,000,000 shares authorized; 441,778,000 and 439,625,000 shares issued and outstanding	4,000,000	4,000,000
Additional paid-in capital	6,391,000,000	6,417,000,000
Accumulated other comprehensive loss	(1,321,000,000)	(1,436,000,000)
Retained earnings	10,787,000,000	10,258,000,000
Total Costco stockholders' equity	15,861,000,000	15,243,000,000
Noncontrolling interests	363,000,000	341,000,000
Total equity	16,224,000,000	15,584,000,000
TOTAL LIABILITIES AND EQUITY	$ 51,431,000,000	$ 45,400,000,000

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Nov. 24, 2019	Sep. 01, 2019
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Common stock, shares, issued	441,778,000	439,625,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	900,000,000	900,000,000

Consolidated Statement of Stock

Consolidated Statement of Stockholders' Equity Statement - USD ($) shares in Thousands, $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Parent [Member]	Noncontrolling Interest [Member]
Common Stock at beginning of period (shares) at Sep. 02, 2018		438,189,000
Equity at beginning of period at Sep. 02, 2018	$ 13,103	$ 4	$ 6,107	$ (1,199)	$ 7,887	$ 12,799	$ 304
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	777				767	767	10
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(134)			(132)		(132)	(2)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	272		272			272
Stock Issued During Period, Shares, Restricted Stock Award, Gross		2,507,000
Stock Issued During Period, Value, Stock Options Exercised	$ (270)		(270)			(270)
Stock Repurchased and Retired During Period, Shares	(150)	(150,000)
Stock Repurchased and Retired During Period, Value	$ (34)		(2)		(32)	(34)
Dividends, Cash and other	(235)		0		(235)	(235)	0
Common Stock at end of period (shares) at Nov. 25, 2018		440,546,000
Equity at end of period at Nov. 25, 2018	13,479	$ 4	6,107	(1,331)	8,387	13,167	312
Common Stock at beginning of period (shares) at Sep. 01, 2019		439,625,000
Equity at beginning of period at Sep. 01, 2019	15,584	$ 4	6,417	(1,436)	10,258	15,243	341
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	856				844	844	12
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	125			115		115	10
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	302		302			302
Stock Issued During Period, Shares, Restricted Stock Award, Gross		2,253,000
Stock Issued During Period, Value, Stock Options Exercised	$ (326)		(326)			(326)
Stock Repurchased and Retired During Period, Shares	(100)	(100,000)
Stock Repurchased and Retired During Period, Value	$ (30)		(2)		(28)	(30)
Dividends, Cash and other	(287)				(287)	(287)
Common Stock at end of period (shares) at Nov. 24, 2019		441,778,000
Equity at end of period at Nov. 24, 2019	$ 16,224	$ 4	$ 6,391	$ (1,321)	$ 10,787	$ 15,861	$ 363

Condensed Consolidated Statem_3

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Nov. 24, 2019	Nov. 25, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income including noncontrolling interests	$ 856	$ 777
Adjustments to reconcile net income including noncontrolling interests to net cash provided by operating activities:
Depreciation and amortization	369	331
COST_OperatingLeaseRightofUseAssetAmortization	39	0
Stock-based compensation	301	270
Other non-cash operating activities, net	16	(4)
Deferred income taxes	5	(31)
Changes in operating assets and liabilities:
Merchandise inventories	(2,384)	(1,324)
Accounts payable	2,664	1,822
Other operating assets and liabilities, net	236	336
Net Cash Provided by (Used in) Operating Activities	2,102	2,177
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of short-term investments	(321)	(316)
Maturities and sales of short-term investments	397	340
Additions to property and equipment	(715)	(730)
Other investing activities, net	9	(31)
Net Cash Provided by (Used in) Investing Activities	(630)	(737)
CASH FLOWS FROM FINANCING ACTIVITIES
Change in bank checks outstanding	122	193
Repayments of long-term debt	0	(89)
Tax withholdings on stock-based awards	(326)	(270)
Repurchases of common stock	(30)	(32)
Cash dividend payments	(573)	(501)
Other financing activities, net	(29)	(1)
Net cash used in financing activities	(836)	(700)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	7	(17)
Net change in cash and cash equivalents	643	723
CASH AND CASH EQUIVALENTS BEGINNING OF YEAR	8,384	6,055
CASH AND CASH EQUIVALENTS END OF PERIOD	9,027	6,778
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest paid	50	49
Income taxes, net	$ 97	$ 133

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Nov. 24, 2019
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. For the period ended November 24, 2019 , Costco operated 785 warehouses worldwide: 546 in the United States (U.S.) located in 44 states, Washington, D.C., and Puerto Rico, 100 in Canada, 39 in Mexico, 29 in the United Kingdom (U.K.), 26 in Japan, 16 in Korea, 13 in Taiwan, 11 in Australia, two in Spain, and one each in Iceland, France and China. The Company operates e-commerce websites in the U.S., Canada, Mexico, U.K., Korea, Taiwan, and Japan. Basis of Presentation The condensed consolidated financial statements include the accounts of Costco, 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 intercompany 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. Unless otherwise noted, references to net income relate to net income attributable to Costco. These unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q for interim financial reporting pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). While these statements reflect all normal recurring adjustments that are, in the opinion of management, necessary for fair presentation of the results of the interim period, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles (U.S. GAAP) for complete financial statements. Therefore, the interim condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company's Annual Report filed on Form 10-K for the fiscal year ended September 1, 2019 . 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. Fiscal 2020 is a 52-week year ending on August 30, 2020 . References to the first quarter of 2020 and 2019 relate to the 12-week fiscal quarters ended November 24, 2019 , and November 25, 2018 , respectively. Use of Estimates The preparation of financial statements in conformity with 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. Leases The Company leases land and/or buildings at warehouses and certain other office and distribution facilities. Leases generally contain one or more of the following options, which the Company can exercise at the end of the initial term: (a) renew the lease for a defined number of years at the then-fair market rental rate or rate stipulated in the lease agreement; (b) purchase the property at the then-fair market value; or (c) a right of first refusal in the event of a third-party offer. Some leases include free rent periods and step-rent provisions, which are recognized 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 rent increases based on price indices or the greater of minimum guaranteed amounts or sales volume. Our leases do not contain any material residual value guarantees or material restrictive covenants. The Company determines at inception of a contract whether the contract is or contains a lease. The Company initially records right-of-use (ROU) assets and lease obligations for its finance and operating leases based on the discounted future minimum lease payments over the term. As the rate implicit in the Company’s leases is not easily determinable, the present value of the sum of the lease payments is calculated by using the Company’s incremental borrowing rate. The rate is determined using a portfolio approach based on the rate of interest the Company would pay to borrow an amount equal to the lease payments on a collateralized basis over a similar term. The Company uses quoted interest rates from financial institutions to derive the incremental borrowing rate. The lease term is defined as the noncancelable period of the lease plus any options to extend when it is reasonably certain that the Company will exercise the option. Recent Accounting Pronouncements Adopted In February 2016, the FASB issued ASU 2016-02 - Leases (ASC 842), which required recognition on the balance sheet for the rights and obligations created by leases with terms greater than 12 months. The Company adopted ASC 842 using the modified retrospective transition method and elected to use the effective date of September 2, 2019 as the date of initial application. Consequently, the comparative periods presented continue to be in accordance with ASC 840, Leases. The Company elected the package of practical expedients permitted under the transition guidance, allowing the Company to carry forward conclusions related to: (a) whether expired or existing contracts contain leases; (b) lease classification; and (c) initial direct costs for existing leases. The Company has elected not to record operating lease right-of-use assets or lease liabilities associated with leases with durations of 12 months or less. Lastly, the Company elected the practical expedient allowing aggregation of non-lease components with related lease components when evaluating accounting treatment for all classes of underlying assets. Adoption of the new standard resulted in an initial increase to assets and liabilities of $2,632 related to recognition of operating lease right-of-use assets and operating lease obligations as of September 2, 2019. Other line item impacts in the Company's condensed consolidated balance sheet were not material. The standard did not materially impact the condensed consolidated statements of income and cash flows. For more information on the Company's lease arrangements refer to Note 5

Investments

Investments	3 Months Ended
	Nov. 24, 2019
Investments, Debt and Equity Securities [Abstract]
Investments	Note 2—Investments The Company's investments were as follows: November 24, 2019: Cost Unrealized Recorded Available-for-sale: Government and agency securities $ 596 $ 4 $ 600 Held-to-maturity: Certificates of deposit 393 393 Total short-term investments $ 989 $ 4 $ 993 September 1, 2019: Cost Unrealized Recorded Available-for-sale: Government and agency securities $ 716 $ 6 $ 722 Held-to-maturity: Certificates of deposit 338 338 Total short-term investments $ 1,054 $ 6 $ 1,060 Gross unrecognized holding gains and losses on available-for-sale securities were not material for the periods ended November 24, 2019 , and September 1, 2019 . At November 24, 2019 , and September 1, 2019 , available-for-sale securities that were in a continuous unrealized-loss position were not material. There were no sales of available-for-sale securities during the first quarter of 2020 or 2019. The maturities of available-for-sale and held-to-maturity securities at November 24, 2019 , are as follows: Available-For-Sale Held-To-Maturity Cost Basis Fair Value Due in one year or less $ 213 $ 212 $ 393 Due after one year through five years 375 379 0 Due after five years 8 9 0 Total $ 596 $ 600 $ 393

Fair Value Measurement

Fair Value Measurement	3 Months Ended
	Nov. 24, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurement	Note 3—Fair Value Measurement Assets and Liabilities Measured at Fair Value on a Recurring Basis The table below presents information regarding financial assets and liabilities that are measured at fair value on a recurring basis and indicate the level within the fair value hierarchy reflecting the valuation techniques utilized to determine fair value. Level 2 November 24, September 1, Investment in government and agency securities (1) $ 699 $ 766 Forward foreign-exchange contracts, in asset position (2) 6 15 Forward foreign-exchange contracts, in (liability) position (2) (7 ) (4 ) Total $ 698 $ 777 _______________ (1) At November 24, 2019 , $99 cash and cash equivalents and $600 short-term investments are included in the accompanying condensed consolidated balance sheets. At September 1, 2019 , $ 44 cash and cash equivalents and $722 short-term investments are included in the accompanying condensed consolidated balance sheets. (2) The asset and liability values are included in other current assets and other current liabilities, respectively, in the accompanying condensed consolidated balance sheets. At November 24, 2019 and September 1, 2019 , the Company did not hold any Level 1 or 3 financial assets or liabilities that were measured at fair value on a recurring basis. There were no transfers between levels during the first quarter of 2020 or 2019 . Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Assets and liabilities recognized and disclosed at fair value on a nonrecurring basis include items such as financial assets measured at amortized cost and long-lived nonfinancial assets. These assets are measured at fair value if determined to be impaired. There were no fair value adjustments to these items during the first quarter of 2020 and 2019 .

Debt

Debt	3 Months Ended
	Nov. 24, 2019
Debt Disclosure [Abstract]
Debt	Note 4—Debt The carrying value of the Company’s long-term debt consisted of the following: November 24, September 1, 1.70% Senior Notes due December 2019 $ 1,200 $ 1,200 1.75% Senior Notes due February 2020 500 500 2.15% Senior Notes due May 2021 1,000 1,000 2.25% Senior Notes due February 2022 500 500 2.30% Senior Notes due May 2022 800 800 2.75% Senior Notes due May 2024 1,000 1,000 3.00% Senior Notes due May 2027 1,000 1,000 Other long-term debt 833 852 Total long-term debt 6,833 6,852 Less unamortized debt discounts and issuance costs 26 29 Less current portion (1) 1,700 1,699 Long-term debt, excluding current portion $ 5,107 $ 5,124 _______________ (1) Net of unamortized debt discounts and issuance costs. The estimated fair value of Senior Notes is valued using Level 2 inputs. Other long-term debt consists of Guaranteed Senior Notes issued by the Company's Japan subsidiary, valued using Level 3 inputs. The fair value of the Company's long-term debt, including the current portion, was approximately $6,945 and $6,997 at November 24, 2019 , and September 1, 2019 , respectively. Subsequent to the end of the quarter, on December 16, 2019, the Company paid the outstanding principal balance and associated interest on the 1.70% Senior Notes from cash and cash equivalents and short-term investments.

Leases (Notes)

Leases (Notes)	3 Months Ended
	Nov. 24, 2019
Leases [Abstract]
Leases of Lessee Disclosure [Text Block]	Note 5— Leases The tables below present information regarding the Company's lease assets and liabilities: November 24, Assets Operating lease right-of-use assets $ 2,597 Finance lease assets (1) 355 Total lease assets $ 2,952 Liabilities Current Operating (2) $ 169 Finance (2) 12 Long-term Operating 2,442 Finance (3) 388 Total lease liabilities $ 3,011 _______________ (1) Included in net property and equipment in the accompanying condensed consolidated balance sheets. (2) Included in other current liabilities in the accompanying condensed consolidated balance sheets. (3) Included in other long-term liabilities in the accompanying condensed consolidated balance sheets. November 24, Weighted-average remaining lease term (years) Operating leases 21 Finance leases 15 Weighted-average discount rate Operating leases 2.25 % Finance leases 8.54 % The components of lease expense, excluding short-term and variable lease costs and sublease income which were not material, were as follows: 12 Weeks Ended November 24, Operating lease cost (1) $ 51 Finance lease cost Amortization of lease assets (1) 4 Interest on lease liabilities (2) 7 Total lease cost $ 62 _______________ (1) Generally included in selling, general and administrative expenses in the accompanying condensed consolidated statements of income. (2) Included in interest expense in the accompanying condensed consolidated statements of income. Supplemental cash flow information related to leases was as follows: 12 Weeks Ended November 24, Cash paid for amounts included in the measurement of lease liabilities Operating cash flows — operating leases $ 40 Operating cash flows — finance leases 7 Financing cash flows — finance leases 31 Leased assets obtained in exchange for finance lease liabilities 4 Leased assets obtained in exchange for operating lease liabilities 10 As of November 24, 2019 , future minimum payments during the next five fiscal years and thereafter are as follows: Operating Leases (1) Finance Leases 2020 $ 173 $ 29 2021 216 40 2022 206 39 2023 212 42 2024 188 40 Thereafter 2,400 557 Total (2) 3,395 747 Less amount representing interest 784 347 Present value of lease liabilities $ 2,611 $ 400 _______________ (1) Operating lease payments have not been reduced by future sublease income of $ 103 . (2) Excludes $250 of lease payments for leases that have been signed but not yet commenced. As of September 1, 2019 , future minimum payments, net of sub-lease income of $105 , under noncancelable operating leases with terms of at least one year and capital leases reported under ASC 840 were as follows: Operating Leases Capital Leases 2020 $ 239 $ 51 2021 229 53 2022 202 38 2023 193 39 2024 181 39 Thereafter 2,206 544 Total $ 3,250 764 Less amount representing interest 343 Net present value of minimum lease payments $ 421

Equity

Equity	3 Months Ended
	Nov. 24, 2019
Equity [Abstract]
Stockholders' equity	Note 6—Equity Dividends The Company’s current quarterly dividend is $0.65 per share, compared to $0.57 in the first quarter of 2019 . On October 18, 2019 , the Board of Directors declared a quarterly dividend in the amount of $0.65 per share, which was paid on November 15, 2019 . Stock Repurchase Programs Stock repurchase activity during the first quarter of 2020 and 2019 is summarized below: Shares Repurchased (000s) Average Price per Share Total Cost First quarter of 2020 100 $ 295.97 $ 30 First quarter of 2019 150 $ 229.35 $ 34 These amounts may differ from the stock repurchase balances in the accompanying condensed consolidated statements of cash flows due to changes in unsettled stock repurchases at the end of a quarter. The remaining amount available for stock repurchases under the approved plan was $3,913 at November 24, 2019 . Purchases are made from time to time, as conditions warrant, in the open market or in block purchases and pursuant to plans under SEC Rule 10b5-1.

Stock-Based Compensation Plans

Stock-Based Compensation Plans	3 Months Ended
	Nov. 24, 2019
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation Plans	Note 7—Stock-Based Compensation The 2019 Incentive Plan authorized the issuance of 17,500,000 shares ( 10,000,000 RSUs) of common stock for future grants, plus the remaining shares that were available for grant and the future forfeited shares from grants under the previous plan up to a maximum aggregate of 27,800,000 shares ( 15,885,000 RSUs). The Company issues new shares of common stock upon vesting of RSUs. Shares for vested RSUs are generally delivered to participants annually, net of shares withheld for taxes. Summary of Restricted Stock Unit Activity At November 24, 2019 , 13,451,000 shares were available to be granted as RSUs, and the following awards were outstanding: • 5,227,000 time-based RSUs that vest upon continued employment over specified periods of time; • 30,000 performance-based RSUs, granted to executive officers of the Company, for which the performance targets have been met. The awards vest upon continued employment over specified periods of time; and • 123,000 performance-based RSUs, granted to executive officers of the Company, subject to achievement of performance targets for fiscal 2020 , as determined by the Compensation Committee of the Board of Directors after the end of the fiscal year. These awards are not included in the table below. The following table summarizes RSU transactions during the first quarter of 2020 : Number of Units (in 000s) Weighted-Average Grant Date Fair Value Outstanding at September 1, 2019 6,496 $ 167.55 Granted 2,128 293.62 Vested and delivered (3,341 ) 188.91 Forfeited (26 ) 182.38 Outstanding at November 24, 2019 5,257 $ 204.94 The remaining unrecognized compensation cost related to nonvested RSUs at November 24, 2019 , was $1,012 , and the weighted-average period over which this cost will be recognized is 1.8 years. Summary of Stock-Based Compensation The following table summarizes stock-based compensation expense and the related tax benefits: 12 Weeks Ended November 24, November 25, Stock-based compensation expense before income taxes $ 301 $ 270 Less recognized income tax benefit (66 ) (61 ) Stock-based compensation expense, net of income taxes $ 235 $ 209

Income Taxes Income Taxes

Income Taxes Income Taxes	3 Months Ended
	Nov. 24, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Note 8—Taxes Other Taxes The Company is undergoing multiple examinations for value-added, sales-based, payroll, product, import or other non-income taxes in various jurisdictions. In certain cases, the Company has received assessments from the authorities. In September 2019, the Company received an assessment related to a product tax audit covering multiple years. The Company recorded the charge in fiscal 2019 and is protesting the assessment. Other possible losses or range of possible losses associated with these matters are either immaterial or an estimate of the possible loss or range of loss cannot be made at this time. If certain matters or a group of matters were to be decided adversely to the Company, it could result in a charge that might be material to the results of an individual fiscal quarter or year.

Net Income per Common and Commo

Net Income per Common and Common Equivalent Share	3 Months Ended
	Nov. 24, 2019
Earnings Per Share [Abstract]
Net Income Per Common and Common Equivalent Share	Note 9—Net Income per Common and Common Equivalent Share The following table shows the amounts used in computing net income per share and the weighted average number of shares of basic and potentially dilutive common shares outstanding (shares in 000s): 12 Weeks Ended November 24, November 25, Net income attributable to Costco $ 844 $ 767 Weighted average basic shares 441,818 439,157 RSUs 1,862 3,592 Weighted average diluted shares 443,680 442,749

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Nov. 24, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 10-Commitments and Contingencies Legal Proceedings The Company is involved in a number of claims, proceedings and litigation arising from its business and property ownership. In accordance with applicable accounting guidance, the Company establishes an accrual for legal proceedings if and when those matters reach a stage where they present loss contingencies that are both probable and reasonably estimable. There may be exposure to loss in excess of any amounts accrued. The Company monitors those matters for developments that would affect the likelihood of a loss (taking into account where applicable indemnification arrangements concerning suppliers and insurers) and the accrued amount, if any, thereof, and adjusts the amount as appropriate. As of the date of this Report, the Company has recorded immaterial accruals with respect to certain matters described below, in addition to other immaterial accruals for matters not described below. If the loss contingency at issue is not both probable and reasonably estimable, the Company does not establish an accrual, but will continue to monitor the matter for developments that will make the loss contingency both probable and reasonably estimable. In each case, there is a reasonable possibility that a loss may be incurred, including a loss in excess of the applicable accrual. For matters where no accrual has been recorded, the possible loss or range of loss (including any loss in excess of the accrual) cannot, in the Company's view, be reasonably estimated because, among other things: (i) the remedies or penalties sought are indeterminate or unspecified; (ii) the legal and/or factual theories are not well developed; and/or (iii) the matters involve complex or novel legal theories or a large number of parties. The Company is a defendant in a class action alleging violation of California Wage Order 7-2001 for failing to provide seating to member service assistants who act as greeters in the Company’s California warehouses. Canela v. Costco Wholesale Corp., et al. (Case No. 5:13-CV-03598, N.D. Cal. filed July 1, 2013). The complaint seeks relief under the California Labor Code, including civil penalties and attorneys’ fees. The Company filed an answer denying the material allegations of the complaint. The action has been stayed pending review by the Ninth Circuit of the order certifying a class. In January 2019, an employee brought similar claims for relief concerning Costco employees engaged at member services counters in California. Rodriguez v. Costco Wholesale Corp. (Case No. RG19001310, Alameda Superior Court filed Jan. 4, 2019). The Company filed an answer denying the material allegations of the complaint. In December 2018, a depot employee raised similar claims, alleging that depot employees in California did not receive suitable seating or appropriate workplace temperature conditions. Lane v. Costco Wholesale Corp. (Dec. 6, 2018 Notice to California Labor and Workforce Development Agency). The Company filed an answer denying the material allegations of the complaint. In October the parties reached an agreement to settle the seating claims on a class basis, which is subject to court approval. In January 2019, a former seasonal employee filed a class action, alleging failure to provide California seasonal employees meal and rest breaks, proper wage statements, and appropriate wages. Jadan v. Costco Wholesale Corp. (Case No. 19-CV-340438 Santa Clara Superior Court filed Jan. 3, 2019). The complaint seeks relief under the California Labor Code, including civil penalties and attorneys’ fees. In October the parties reached an agreement on a class settlement, which is subject to court approval. In March 2019, employees filed a class action against the Company alleging claims under California law for failure to pay overtime, to provide meal periods and itemized wage statements, to timely pay wages due to terminating employees, to pay minimum wages, and for unfair business practices. Relief is sought under the California Labor Code, including civil penalties and attorneys' fees. Nevarez, et ano., v. Costco Wholesale Corp., et al. (Case No. 2:19-cv-03454 C.D. Cal. filed Mar. 25, 2019). The Company filed an answer denying the material allegations of the complaint. In May 2019, employees filed a class action against the Company alleging claims under California law for failure to pay overtime, to provide itemized wage statements, to timely pay wages due to terminating employees, to pay minimum wages, and for unfair business practices. Rough v. Costco Wholesale Corp . (Case No. 2:19-cv-01340 E.D. Cal. filed May 28, 2019). Relief is sought under the California Labor Code, including civil penalties and attorneys' fees. In June 2019, employees filed a class action against the Company alleging claims under California law for failure to pay overtime, to provide meal and rest periods, itemized wage statements, to timely pay wages due to terminating employees, to pay minimum wages, and for unfair business practices. Martinez v. Costco Wholesale Corp ., (Case No. 3:19-cv-05624 N.D. Cal. filed June 11, 2019). The Company filed an answer denying the material allegations of the complaint. In August 2019, Rough filed a companion case in state court seeking penalties under the California Labor Code Private Attorneys General Act. Rough v. Costco (Case No. FCS053454, Sonoma County Superior Court, filed August 23, 2019). Relief is sought under the California Labor Code, including civil penalties and attorneys' fees. In September 2019, an employee re-filed a class action against the Company alleging claims under California law for failure to pay wages, to provide meal and rest periods and itemized wage statements, to timely pay wages due to terminating employees, to pay minimum wages, and for unfair business practices. Mosley v. Costco Wholesale Corp. (Case No. 2:19-cv-07935, C.D. Cal. filed Sept. 12, 2019). Relief is sought under the California Labor Code, including civil penalties and attorneys' fees. In December 2017, the United States Judicial Panel on Multidistrict Litigation consolidated numerous cases filed against various defendants by counties, cities, hospitals, Native American tribes, third-party payors, and others concerning the impacts of opioid abuse. In re National Prescription Opiate Litigation (MDL No. 2804) (N.D. Ohio). Included are federal cases that name the Company, including actions filed by counties and cities in Michigan, New Jersey, Oregon, Virginia and South Carolina, a third-party payor in Ohio, and class actions filed in thirty-eight states on behalf of infants born with opioid-related medical conditions. In 2019 similar actions were commenced against the Company in state courts in Utah and Arizona. Claims against the Company in state courts in New Jersey and Oklahoma have been dismissed. The Company is defending all of these matters. The Company and its CEO and CFO are defendants in putative class actions brought on behalf of shareholders who acquired Company stock between June 6 and October 25, 2018. Johnson v. Costco Wholesale Corp., et al. (W.D. Wash. filed Nov. 5, 2018); Chen v. Costco Wholesale Corp., et al. (W.D. Wash. filed Dec. 11, 2018). The complaints allege violations of the federal securities laws stemming from the Company’s disclosures concerning internal control over financial reporting. They seek unspecified damages, equitable relief, interest, and costs and attorneys’ fees. On January 30, 2019, an order was entered consolidating the actions, and a consolidated amended complaint was filed on April 16. On November 26, the court entered an order dismissing the consolidated amended complaint and granting the plaintiffs leave to file a further amended complaint within 90 days. Members of the Board of Directors, one other individual, and the Company are defendants in a shareholder derivative action related to the internal controls and related disclosures identified in the putative class actions, alleging that the individual defendants breached their fiduciary duties. Wedekind v. Hamilton James, Susan Decker, Kenneth Denman, Richard Galanti, Craig Jelinek, Richard Libenson, John Meisenbach, Charles Munger, Jeffrey Raikes, John Stanton, Mary Agnes Wilderotter, and Costco Wholesale Corp. (W.D. Wash. filed Dec. 11, 2018). The complaint seeks unspecified damages, disgorgement of compensation, corporate governance changes, and costs and attorneys' fees. Because the complaint is derivative in nature, it does not seek monetary damages from the Company, which is a nominal defendant. By agreement among the parties the action has been stayed pending further proceedings in the class actions. Similar actions were filed in King County Superior Court on February 20, 2019, Elliott v. Hamilton James, Susan Decker, Kenneth Denman, Richard Galanti, Craig Jelinek, Richard Libenson, John Meisenbach, Charles Munger, Jeffrey Raikes, John Stanton, Mary Agnes Wilderotter, and Costco Wholesale Corp. (Case No. 19-2-04824-7), April 16, 2019, Brad Shuman, et ano. v. Hamilton James, Susan Decker, Kenneth Denman, Richard Galanti, Craig Jelinek, John Meisenbach, Charles Munger, Jeffrey Raikes, John Stanton, Mary Agnes Wilderotter, and Costco Wholesale Corp. (Case No. 19-2-10460-1), and June 12, 2019, Rahul Modi v. Hamilton James, Susan Decker, Kenneth Denman, Richard Galanti, Craig Jelinek, John Meisenbach, Charles Munger, Jeffrey Raikes, John Stanton, Mary Agnes Wilderotter, and Costco Wholesale Corp. (Case No. 19-2-15514-1). These actions have also been stayed. In November 2016 and September 2017, the Company received notices of violation from the Connecticut Department of Energy and Environmental Protection regarding hazardous waste practices at its Connecticut warehouses, primarily concerning unsalable pharmaceuticals. The relief to be sought is not known at this time. The Company is seeking to cooperate concerning the resolution of these notices. The Company does not believe that any pending claim, proceeding or litigation, either alone or in the aggregate, will have a material adverse effect on the Company’s financial position, results of operations or cash flows; however, it is possible that an unfavorable outcome of some or all of the matters, however unlikely, could result in a charge that might be material to the results of an individual fiscal quarter or year.

Segment Reporting

Segment Reporting	3 Months Ended
	Nov. 24, 2019
Segment Reporting [Abstract]
Segment Reporting	Note 11—Segment Reporting The Company and its subsidiaries are principally engaged in the operation of membership warehouses in the U.S., Canada, Mexico, U.K., Japan, Korea, Australia, Spain, Iceland, France and China and through a majority-owned subsidiary in Taiwan. Reportable segments are largely based on management’s organization of the operating segments for operational decisions and assessments of financial performance, which consider geographic locations. The material accounting policies of the segments are as described in the notes to the consolidated financial statements included in the Company's Annual Report filed on Form 10-K for the fiscal year ended September 1, 2019 , and Note 1 above. Intersegment net sales and expenses have been eliminated in computing total revenue and operating income. Certain operating expenses, predominantly stock-based compensation, are incurred on behalf of the Company's Canadian and Other International operations, but are included in the U.S. operations because those costs generally come under the responsibility of the Company's U.S. management team. The following table provides information for the Company's reportable segments: United States Canadian Other Total 12 Weeks Ended November 24, 2019 Total revenue $ 27,065 $ 5,127 $ 4,848 $ 37,040 Operating income 635 228 198 1,061 Total assets 35,784 4,857 10,790 51,431 12 Weeks Ended November 25, 2018 Total revenue $ 25,550 $ 4,977 $ 4,542 $ 35,069 Operating income 560 214 175 949 Total assets 30,499 4,673 8,642 43,814 52 Weeks Ended September 1, 2019 Total revenue $ 111,751 $ 21,366 $ 19,586 $ 152,703 Operating income 3,063 924 750 4,737 Total assets 32,162 4,369 8,869 45,400 Disaggregated Revenue The following table summarizes net sales by merchandise category: 12 Weeks Ended November 24, November 25, Foods and Sundries $ 14,532 $ 13,641 Hardlines 5,843 5,840 Fresh Foods 4,576 4,293 Softlines 4,297 4,123 Ancillary 6,988 6,414 Total Net Sales $ 36,236 $ 34,311

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Nov. 24, 2019
Accounting Policies [Abstract]
Basis of Accounting, Policy	Basis of Presentation The condensed consolidated financial statements include the accounts of Costco, 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 intercompany 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. Unless otherwise noted, references to net income relate to net income attributable to Costco. These unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q for interim financial reporting pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). While these statements reflect all normal recurring adjustments that are, in the opinion of management, necessary for fair presentation of the results of the interim period, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles (U.S. GAAP) for complete financial statements. Therefore, the interim condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company's Annual Report filed on Form 10-K for the fiscal year ended September 1, 2019
Fiscal Period, Policy	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. Fiscal 2020 is a 52-week year ending on August 30, 2020 . References to the first quarter of 2020 and 2019 relate to the 12-week fiscal quarters ended November 24, 2019 , and November 25, 2018 , respectively.
Use of Estimates, Policy	Use of Estimates The preparation of financial statements in conformity with 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.
Lessee, Leases [Policy Text Block]	Leases The Company leases land and/or buildings at warehouses and certain other office and distribution facilities. Leases generally contain one or more of the following options, which the Company can exercise at the end of the initial term: (a) renew the lease for a defined number of years at the then-fair market rental rate or rate stipulated in the lease agreement; (b) purchase the property at the then-fair market value; or (c) a right of first refusal in the event of a third-party offer. Some leases include free rent periods and step-rent provisions, which are recognized 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 rent increases based on price indices or the greater of minimum guaranteed amounts or sales volume. Our leases do not contain any material residual value guarantees or material restrictive covenants. The Company determines at inception of a contract whether the contract is or contains a lease. The Company initially records right-of-use (ROU) assets and lease obligations for its finance and operating leases based on the discounted future minimum lease payments over the term. As the rate implicit in the Company’s leases is not easily determinable, the present value of the sum of the lease payments is calculated by using the Company’s incremental borrowing rate. The rate is determined using a portfolio approach based on the rate of interest the Company would pay to borrow an amount equal to the lease payments on a collateralized basis over a similar term. The Company uses quoted interest rates from financial institutions to derive the incremental borrowing rate. The lease term is defined as the noncancelable period of the lease plus any options to extend when it is reasonably certain that the Company will exercise the option.
Recent Accounting Pronouncements Adopted	Recent Accounting Pronouncements Adopted In February 2016, the FASB issued ASU 2016-02 - Leases (ASC 842), which required recognition on the balance sheet for the rights and obligations created by leases with terms greater than 12 months. The Company adopted ASC 842 using the modified retrospective transition method and elected to use the effective date of September 2, 2019 as the date of initial application. Consequently, the comparative periods presented continue to be in accordance with ASC 840, Leases. The Company elected the package of practical expedients permitted under the transition guidance, allowing the Company to carry forward conclusions related to: (a) whether expired or existing contracts contain leases; (b) lease classification; and (c) initial direct costs for existing leases. The Company has elected not to record operating lease right-of-use assets or lease liabilities associated with leases with durations of 12 months or less. Lastly, the Company elected the practical expedient allowing aggregation of non-lease components with related lease components when evaluating accounting treatment for all classes of underlying assets. Adoption of the new standard resulted in an initial increase to assets and liabilities of $2,632 related to recognition of operating lease right-of-use assets and operating lease obligations as of September 2, 2019. Other line item impacts in the Company's condensed consolidated balance sheet were not material. The standard did not materially impact the condensed consolidated statements of income and cash flows. For more information on the Company's lease arrangements refer to Note 5 .
Recent Accounting Pronouncements Not Yet Adopted	doption of the new standard resulted in an initial increase to assets and liabilities of $2,632 related to recognition of operating lease right-of-use assets and operating lease obligations as of September 2, 2019. Other line item impacts in the Company's condensed consolidated balance sheet were not material. The standard did not materially impact the condensed consolidated statements of income and cash flows. For more information on the Company's lease arrangements refer to Note 5

Investments (Tables)

Investments (Tables)	3 Months Ended
	Nov. 24, 2019
Investments, Debt and Equity Securities [Abstract]
Available-for-sale and Held-to-maturity Investments	The Company's investments were as follows: November 24, 2019: Cost Unrealized Recorded Available-for-sale: Government and agency securities $ 596 $ 4 $ 600 Held-to-maturity: Certificates of deposit 393 393 Total short-term investments $ 989 $ 4 $ 993 September 1, 2019: Cost Unrealized Recorded Available-for-sale: Government and agency securities $ 716 $ 6 $ 722 Held-to-maturity: Certificates of deposit 338 338 Total short-term investments $ 1,054 $ 6 $ 1,060
Maturities of Available-for-sale and Held-to-maturity Securities	The maturities of available-for-sale and held-to-maturity securities at November 24, 2019 , are as follows: Available-For-Sale Held-To-Maturity Cost Basis Fair Value Due in one year or less $ 213 $ 212 $ 393 Due after one year through five years 375 379 0 Due after five years 8 9 0 Total $ 596 $ 600 $ 393

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	3 Months Ended
	Nov. 24, 2019
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Liabilities Measured on Recurring Basis	The table below presents information regarding financial assets and liabilities that are measured at fair value on a recurring basis and indicate the level within the fair value hierarchy reflecting the valuation techniques utilized to determine fair value. Level 2 November 24, September 1, Investment in government and agency securities (1) $ 699 $ 766 Forward foreign-exchange contracts, in asset position (2) 6 15 Forward foreign-exchange contracts, in (liability) position (2) (7 ) (4 ) Total $ 698 $ 777 _______________ (1) At November 24, 2019 , $99 cash and cash equivalents and $600 short-term investments are included in the accompanying condensed consolidated balance sheets. At September 1, 2019 , $ 44 cash and cash equivalents and $722 short-term investments are included in the accompanying condensed consolidated balance sheets. (2) The asset and liability values are included in other current assets and other current liabilities, respectively, in the accompanying condensed consolidated balance sheets.

Debt (Tables)

Debt (Tables)	3 Months Ended
	Nov. 24, 2019
Debt Disclosure [Abstract]
Carrying Value and Estimated Fair Value of Company's Long-term Debt	The carrying value of the Company’s long-term debt consisted of the following: November 24, September 1, 1.70% Senior Notes due December 2019 $ 1,200 $ 1,200 1.75% Senior Notes due February 2020 500 500 2.15% Senior Notes due May 2021 1,000 1,000 2.25% Senior Notes due February 2022 500 500 2.30% Senior Notes due May 2022 800 800 2.75% Senior Notes due May 2024 1,000 1,000 3.00% Senior Notes due May 2027 1,000 1,000 Other long-term debt 833 852 Total long-term debt 6,833 6,852 Less unamortized debt discounts and issuance costs 26 29 Less current portion (1) 1,700 1,699 Long-term debt, excluding current portion $ 5,107 $ 5,124 _______________ (1) Net of unamortized debt discounts and issuance costs.

Leases (Tables)

Leases (Tables)	3 Months Ended
	Nov. 24, 2019
Lessee, Lease, Description [Line Items]
Supplemental Balance Sheet Disclosures [Text Block]	The tables below present information regarding the Company's lease assets and liabilities: November 24, Assets Operating lease right-of-use assets $ 2,597 Finance lease assets (1) 355 Total lease assets $ 2,952 Liabilities Current Operating (2) $ 169 Finance (2) 12 Long-term Operating 2,442 Finance (3) 388 Total lease liabilities $ 3,011 _______________ (1) Included in net property and equipment in the accompanying condensed consolidated balance sheets. (2) Included in other current liabilities in the accompanying condensed consolidated balance sheets. (3) Included in other long-term liabilities in the accompanying condensed consolidated balance sheets. November 24, Weighted-average remaining lease term (years) Operating leases 21 Finance leases 15 Weighted-average discount rate Operating leases 2.25 % Finance leases 8.54 %
Lease, Cost [Table Text Block]	The components of lease expense, excluding short-term and variable lease costs and sublease income which were not material, were as follows: 12 Weeks Ended November 24, Operating lease cost (1) $ 51 Finance lease cost Amortization of lease assets (1) 4 Interest on lease liabilities (2) 7 Total lease cost $ 62 _______________ (1) Generally included in selling, general and administrative expenses in the accompanying condensed consolidated statements of income. (2) Included in interest expense in the accompanying condensed consolidated statements of income.
Cash Flow, Supplemental Disclosures [Text Block]	Supplemental cash flow information related to leases was as follows: 12 Weeks Ended November 24, Cash paid for amounts included in the measurement of lease liabilities Operating cash flows — operating leases $ 40 Operating cash flows — finance leases 7 Financing cash flows — finance leases 31 Leased assets obtained in exchange for finance lease liabilities 4 Leased assets obtained in exchange for operating lease liabilities 10
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	during the next five fiscal years and thereafter are as follows: Operating Leases (1) Finance Leases 2020 $ 173 $ 29 2021 216 40 2022 206 39 2023 212 42 2024 188 40 Thereafter 2,400 557 Total (2) 3,395 747 Less amount representing interest 784 347 Present value of lease liabilities $ 2,611 $ 400 _______________ (1) Operating lease payments have not been reduced by future sublease income of $ 103 . (2) Excludes $250 of lease payments for leases that have been signed but not yet commenced.
Leases of Lessee Disclosure [Text Block]	As of September 1, 2019 , future minimum payments, net of sub-lease income of $105 , under noncancelable operating leases with terms of at least one year and capital leases reported under ASC 840 were as follows: Operating Leases Capital Leases 2020 $ 239 $ 51 2021 229 53 2022 202 38 2023 193 39 2024 181 39 Thereafter 2,206 544 Total $ 3,250 764 Less amount representing interest 343 Net present value of minimum lease payments $ 421

Equity (Tables)

Equity (Tables)	3 Months Ended
	Nov. 24, 2019
Equity [Abstract]
Stock Repurchased During Period	Stock repurchase activity during the first quarter of 2020 and 2019 is summarized below: Shares Repurchased (000s) Average Price per Share Total Cost First quarter of 2020 100 $ 295.97 $ 30 First quarter of 2019 150 $ 229.35 $ 34

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Tables)	3 Months Ended
	Nov. 24, 2019
Share-based Payment Arrangement [Abstract]
Summary of RSU Transactions	The following table summarizes RSU transactions during the first quarter of 2020 : Number of Units (in 000s) Weighted-Average Grant Date Fair Value Outstanding at September 1, 2019 6,496 $ 167.55 Granted 2,128 293.62 Vested and delivered (3,341 ) 188.91 Forfeited (26 ) 182.38 Outstanding at November 24, 2019 5,257 $ 204.94
Summary of Stock-Based Compensation Expense and Related Tax Benefits	The following table summarizes stock-based compensation expense and the related tax benefits: 12 Weeks Ended November 24, November 25, Stock-based compensation expense before income taxes $ 301 $ 270 Less recognized income tax benefit (66 ) (61 ) Stock-based compensation expense, net of income taxes $ 235 $ 209

Net Income per Common and Com_2

Net Income per Common and Common Equivalent Share (Tables)	3 Months Ended
	Nov. 24, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table shows the amounts used in computing net income per share and the weighted average number of shares of basic and potentially dilutive common shares outstanding (shares in 000s): 12 Weeks Ended November 24, November 25, Net income attributable to Costco $ 844 $ 767 Weighted average basic shares 441,818 439,157 RSUs 1,862 3,592 Weighted average diluted shares 443,680 442,749

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Nov. 24, 2019
Segment Reporting [Abstract]
Segment Reporting Information, by Segment	The following table provides information for the Company's reportable segments: United States Canadian Other Total 12 Weeks Ended November 24, 2019 Total revenue $ 27,065 $ 5,127 $ 4,848 $ 37,040 Operating income 635 228 198 1,061 Total assets 35,784 4,857 10,790 51,431 12 Weeks Ended November 25, 2018 Total revenue $ 25,550 $ 4,977 $ 4,542 $ 35,069 Operating income 560 214 175 949 Total assets 30,499 4,673 8,642 43,814 52 Weeks Ended September 1, 2019 Total revenue $ 111,751 $ 21,366 $ 19,586 $ 152,703 Operating income 3,063 924 750 4,737 Total assets 32,162 4,369 8,869 45,400
Disaggregation of Revenue [Table Text Block]	Disaggregated Revenue The following table summarizes net sales by merchandise category: 12 Weeks Ended November 24, November 25, Foods and Sundries $ 14,532 $ 13,641 Hardlines 5,843 5,840 Fresh Foods 4,576 4,293 Softlines 4,297 4,123 Ancillary 6,988 6,414 Total Net Sales $ 36,236 $ 34,311

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	Sep. 02, 2019USD ($)	Nov. 24, 2019USD ($)warehousestates	Sep. 01, 2019USD ($)
Summary Of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $	$ 2,632
Document Fiscal Year Focus		2020
Document Period End Date		Nov. 24, 2019
Number of warehouses operated		785
Operating Lease, Right-of-Use Asset | $		$ 2,597	$ 0
UNITED STATES
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated		546
Number of states in country | states		44
CANADA
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated		100
MEXICO
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated		39
UNITED KINGDOM
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated		29
JAPAN
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated		26
KOREA
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated		16
TAIWAN
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated		13
AUSTRALIA
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated		11
SPAIN
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated		2
ICELAND
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated		1
FRANCE
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated		1
CHINA
Summary Of Significant Accounting Policies [Line Items]
Number of warehouses operated		1

Investments - Available-for-sal

Investments - Available-for-sale and Held-to-maturity Investments (Detail) - USD ($) $ in Millions	3 Months Ended
	Nov. 24, 2019	Sep. 01, 2019
Available-for-sale and Held-to-maturity [Line Items]
Document Period End Date	Nov. 24, 2019
Available-for-sale, cost basis, total	$ 596
Short-term Investments	600
Held-to-maturity, cost basis	393
Total investments, recorded basis	993	$ 1,060
Short-term Investments
Available-for-sale and Held-to-maturity [Line Items]
Available-for-sale, cost basis, total	596
Unrealized gains/(loss), net	4
Short-term Investments	600
Held-to-maturity, recorded basis	393	338
Held-to-maturity, cost basis	393	338
Total investments, recorded basis	993	1,060
Total investments, cost basis, total	989	1,054
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	4	6
Short-term Investments | Government and Agency Securities
Available-for-sale and Held-to-maturity [Line Items]
Available-for-sale, cost basis, total	596	716
Short-term Investments	600	722
Available-for-sale, recorded basis	600	722
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	4	6
Short-term Investments | Certificates of deposit
Available-for-sale and Held-to-maturity [Line Items]
Held-to-maturity, recorded basis	393	338
Held-to-maturity, cost basis	$ 393	$ 338

Investments - Maturities of Ava

Investments - Maturities of Available-for-sale and Held-to-maturity Securities (Details) $ in Millions	Nov. 24, 2019USD ($)
Available-for-sale, Cost Basis
Due in one year or less	$ 213
Due after one year through five years	375
Due after five years	8
Available-for-sale, cost basis, total	596
Available-for-sale, Fair Value
Due in one year or less	212
Due after one year through five years	379
Due after five years	9
Available-for-sale, recorded basis, total	600
Held-to-maturity
Due in one year or less	393
Due after one year through five years	0
Due after five years	0
Held-to-maturity, cost basis, total	$ 393

Fair Value Measurement - Fair V

Fair Value Measurement - Fair Value of Financial Assets and Financial Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 24, 2019	Sep. 01, 2019	Nov. 25, 2018	Sep. 02, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Document Period End Date	Nov. 24, 2019
Cash and Cash Equivalents, at Carrying Value	$ 9,027	$ 8,384	$ 6,778	$ 6,055
Short-term Investments	600
Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, at Carrying Value	99	44
Short-term Investments	600
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets measured on recurring basis	698	777
Government and Agency Securities | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term Investments	600	722
Government and Agency Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets measured on recurring basis	699	766
Forward Foreign-exchange Contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets measured on recurring basis	6	15
Fair value of liabilities measured on recurring basis	$ (7)	$ (4)

Debt (Carrying Value and Estima

Debt (Carrying Value and Estimated Fair Value of Company's Long-term Debt) (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 24, 2019	Sep. 01, 2019
Debt Instrument [Line Items]
Total long-term debt, Face value	$ 6,833	$ 6,852
Less unamortized debt discounts and issuance costs, Net	26	29
Current portion of long-term debt	1,700	1,699
Long-term debt, excluding current portion	5,107	5,124
Total long-term debt, fair value	6,945	6,997
1.7% Senior Notes Due December 2019
Debt Instrument [Line Items]
Total long-term debt, Face value	$ 1,200	1,200
Debt instrument, interest rate, stated percentage	1.70%
Debt instrument, maturity date	Dec. 15, 2019
1.75% Senior Notes Due February 2020
Debt Instrument [Line Items]
Total long-term debt, Face value	$ 500	500
Debt instrument, interest rate, stated percentage	1.75%
Debt instrument, maturity date	Feb. 15, 2020
2.15% Senior Notes Due May 2021
Debt Instrument [Line Items]
Total long-term debt, Face value	$ 1,000	1,000
Debt instrument, interest rate, stated percentage	2.15%
Debt instrument, maturity date	May 18, 2021
2.25% Senior Notes Due February 2022
Debt Instrument [Line Items]
Total long-term debt, Face value	$ 500	500
Debt instrument, interest rate, stated percentage	2.25%
Debt instrument, maturity date	Feb. 15, 2022
2.30% Senior Notes Due May 2022
Debt Instrument [Line Items]
Total long-term debt, Face value	$ 800	800
Debt instrument, interest rate, stated percentage	2.30%
Debt instrument, maturity date	May 18, 2022
2.75% Senior Notes Due May 2024
Debt Instrument [Line Items]
Total long-term debt, Face value	$ 1,000	1,000
Debt instrument, interest rate, stated percentage	2.75%
Debt instrument, maturity date	May 18, 2024
3.00% Senior Notes Due May 2027
Debt Instrument [Line Items]
Total long-term debt, Face value	$ 1,000	1,000
Debt instrument, interest rate, stated percentage	3.00%
Debt instrument, maturity date	May 18, 2027
Other Long-term Debt
Debt Instrument [Line Items]
Total long-term debt, Face value	$ 833	$ 852

Leases (Details)

Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 24, 2019	Sep. 01, 2019
Lessee, Lease, Description [Line Items]
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals	$ 103	$ 105
Document Period End Date	Nov. 24, 2019
Operating Leases, Future Minimum Payments Receivable, Current		239
Finance Lease, Liability, Payments, Due Next Twelve Months		51
Operating Lease, Weighted Average Remaining Lease Term	21 years
Operating Lease, Payments	$ 40
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	173
Finance Lease, Liability, Payments, Remainder of Fiscal Year	29
Operating Lease, Cost	51
Operating Lease, Right-of-Use Asset	2,597	0
Finance Lease, Right-of-Use Asset	355
Operating Lease, Liability, Current	169
Finance Lease, Liability, Current	12
Operating Lease, Liability, Noncurrent	2,442	0
Finance Lease, Liability, Noncurrent	388
Finance Lease, Right-of-Use Asset, Amortization	4
Finance Lease, Interest Expense	7
Lease, Cost	62
Lessee, Operating Lease, Liability, Payments, Due Year Two	216
Finance Lease, Liability, Payments, Due Year Two	40	53
Lessee, Operating Lease, Liability, Payments, Due Year Three	206
Finance Lease, Liability, Payments, Due Year Three	39	38
Lessee, Operating Lease, Liability, Payments, Due Year Four	212
Finance Lease, Liability, Payments, Due Year Four	42	39
Lessee, Operating Lease, Liability, Payments, Due Year Five	188
Finance Lease, Liability, Payments, Due Year Five	40	39
Lessee, Operating Lease, Liability, Payments, Due after Year Five	2,400
Finance Lease, Liability, Payments, Due after Year Five	557	544
Lessee, Operating Lease, Liability, Payments, Due	3,395
Finance Lease, Liability, Payment, Due	747	764
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	784
Finance Lease, Liability, Undiscounted Excess Amount	347	343
Operating Lease, Liability	2,611
Finance Lease, Liability	400	421
Finance Lease, Interest Payment on Liability	7
Finance Lease, Principal Payments	$ 31
Finance Lease, Weighted Average Remaining Lease Term	15 years
Operating Lease, Weighted Average Discount Rate, Percent	2.25%
Finance Lease, Weighted Average Discount Rate, Percent	8.54%
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 4
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	10
Operating Leases, Future Minimum Payments, Due in Two Years		229
Operating Leases, Future Minimum Payments, Due in Three Years		202
Operating Leases, Future Minimum Payments, Due in Four Years		193
Operating Leases, Future Minimum Payments, Due in Five Years		181
Operating Leases, Future Minimum Payments, Due Thereafter		2,206
Operating Leases, Future Minimum Payments Due		$ 3,250
COST_OperatingLeaseandFinanceLeaseLiabilities	3,011
COST_OperatingLeaseandFinanceLeaserightofuseassets	2,952
COST_LesseeOperatingLeaseNotYetCommenced	$ 250

Equity - Additional Information

Equity - Additional Information - Dividends (Detail) - $ / shares	3 Months Ended
	Nov. 24, 2019	Nov. 25, 2018
Dividends Payable [Line Items]
Dividends declared	$ 0.65	$ 0.57
Dividend Rate
Dividends Payable [Line Items]
Dividends declared	$ 0.65

Equity (Stock Repurchased Durin

Equity (Stock Repurchased During Period) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Nov. 24, 2019	Nov. 25, 2018
Equity [Abstract]
Stock Repurchased and Retired During Period, Shares	100	150
Average price per share	$ 295.97	$ 229.35
Total Cost	$ (30)	$ (34)

Equity - Additional Informati_2

Equity - Additional Information - Stock Repurchase Programs (Details) $ in Millions	Nov. 24, 2019USD ($)
Equity [Abstract]
Stock repurchase program, remaining authorized repurchase amount	$ 3,913

Stock-Based Compensation Plan_2

Stock-Based Compensation Plans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Nov. 24, 2019	Sep. 01, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Document Period End Date	Nov. 24, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares	5,257,000	6,496,000
Document Fiscal Year Focus	2020
2019 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional number of shares authorized	17,500,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional number of shares authorized	10,000,000
Number of shares available to be granted	13,451,000
Time-based RSUs awards outstanding	5,227,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares	30,000
Unrecognized compensation cost	$ 1,012
Weighted-average recognition period	1 year 9 months 18 days
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding performance-based RSUs awards granted, subject to achievement of performance targets	123,000
Maximum [Member] | 2019 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available to be granted	27,800,000
Maximum [Member] | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available to be granted	15,885,000

Stock-Based Compensation Plan_3

Stock-Based Compensation Plans - Summary of RSU Transactions (Details) shares in Thousands	3 Months Ended
	Nov. 24, 2019$ / sharesshares
Number of units
Outstanding at September 1, 2019 | shares	6,496
Granted | shares	2,128
Vested and delivered | shares	(3,341)
Forfeited | shares	(26)
Outstanding at November 24, 2019 | shares	5,257
Weighted average grant date fair value
Outstanding at September 1, 2019 | $ / shares	$ 167.55
Granted | $ / shares	293.62
Vested and delivered | $ / shares	188.91
Forfeited | $ / shares	182.38
Outstanding at November 24, 2019 | $ / shares	$ 204.94

Stock-Based Compensation Plan_4

Stock-Based Compensation Plans - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 24, 2019	Nov. 25, 2018
Document Period End Date	Nov. 24, 2019
Stock-based compensation expense before income taxes	$ 301	$ 270
Less recognized income tax benefit	(66)	(61)
Stock-based compensation expense, net of income taxes	$ 235	$ 209
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 9 months 18 days

Net Income per Common and Com_3

Net Income per Common and Common Equivalent Share - Schedule of Earnings per Share Effect on Net Income and Weighted Average Number of Dilutive Potential Common Stock (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Nov. 24, 2019	Nov. 25, 2018
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent	$ 844	$ 767
Weighted average number of common shares used in basic net income per common share	441,818	439,157
RSUs	1,862	3,592
Weighted average number of common shares and dilutive potential of common stock used in diluted net income per share	443,680	442,749

Segment Reporting Information b

Segment Reporting Information by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Nov. 24, 2019	Nov. 25, 2018	Sep. 01, 2019
Segment Reporting Information [Line Items]
Total Revenue	$ 37,040	$ 35,069	$ 152,703
Operating Income	1,061	949	4,737
Total Assets	51,431	43,814	45,400
Operating Segments [Member] | United States Operations
Segment Reporting Information [Line Items]
Total Revenue	27,065	25,550	111,751
Operating Income	635	560	3,063
Total Assets	35,784	30,499	32,162
Operating Segments [Member] | Canada Operations
Segment Reporting Information [Line Items]
Total Revenue	5,127	4,977	21,366
Operating Income	228	214	924
Total Assets	4,857	4,673	4,369
Operating Segments [Member] | Other International Operations
Segment Reporting Information [Line Items]
Total Revenue	4,848	4,542	19,586
Operating Income	198	175	750
Total Assets	$ 10,790	$ 8,642	$ 8,869

Segment Reporting Segment Repor

Segment Reporting Segment Reporting Information by Item Category (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 24, 2019	Nov. 25, 2018
Disaggregation of Revenue [Line Items]
Total Revenue	$ 37,040	$ 35,069
Food and Sundries [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	14,532	13,641
Hardlines [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	5,843	5,840
Fresh Food [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	4,576	4,293
Softlines [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	4,297	4,123
Ancillary
Disaggregation of Revenue [Line Items]
Total Revenue	6,988	6,414
Net sales
Disaggregation of Revenue [Line Items]
Total Revenue	$ 36,236	$ 34,311