Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Feb. 18, 2018	Feb. 12, 2017	Feb. 18, 2018	Feb. 12, 2017
REVENUE
Net sales	$ 32,279	$ 29,130	$ 63,396	$ 56,599
Membership fees	716	636	1,408	1,266
Total revenue	32,995	29,766	64,804	57,865
OPERATING EXPENSES
Merchandise costs	28,733	25,927	56,350	50,215
Selling, general and administrative	3,234	2,980	6,458	5,920
Preopening expenses	12	15	29	37
Operating income	1,016	844	1,967	1,693
OTHER INCOME (EXPENSE)
Interest expense	(37)	(31)	(74)	(60)
Interest income and other, net	7	(4)	29	22
INCOME BEFORE INCOME TAXES	986	809	1,922	1,655
Provision for income taxes	273	288	558	579
Net income including noncontrolling interests	713	521	1,364	1,076
Net income attributable to noncontrolling interests	(12)	(6)	(23)	(16)
NET INCOME ATTRIBUTABLE TO COSTCO	$ 701	$ 515	$ 1,341	$ 1,060
NET INCOME PER COMMON SHARE ATTRIBUTABLE TO COSTCO:
Basic (in dollars per share)	$ 1.60	$ 1.17	$ 3.06	$ 2.42
Diluted (in dollars per share)	$ 1.59	$ 1.17	$ 3.04	$ 2.41
Shares used in calculation (000's)
Basic (shares)	439,022	439,127	438,494	438,567
Diluted (shares)	441,568	440,657	441,201	440,568
CASH DIVIDENDS DECLARED PER COMMON SHARE	$ 0.50	$ 0.45	$ 1.00	$ 0.90