Financing - Schedule of Debt (Detail) - USD ($) $ in Thousands	Feb. 10, 2018	Aug. 26, 2017
Debt Instrument [Line Items]
Commercial paper	$ 1,115,500	$ 1,155,100
Total debt before discounts and debt issuance costs	5,065,500	5,105,100
Less: Discounts and debt issuance costs	21,959	23,862
Long-term debt	5,043,541	5,081,238
7.125% Senior Notes due August 2018, effective interest rate of 7.28% [Member]
Debt Instrument [Line Items]
Senior notes	250,000	250,000
1.625% Senior Notes due April 2019, effective interest rate of 1.77% [Member]
Debt Instrument [Line Items]
Senior notes	250,000	250,000
4.000% Senior Notes due November 2020, effective interest rate of 4.43% [Member]
Debt Instrument [Line Items]
Senior notes	500,000	500,000
2.500% Senior Notes due April 2021, effective interest rate of 2.62% [Member]
Debt Instrument [Line Items]
Senior notes	250,000	250,000
3.700% Senior Notes due April 2022, effective interest rate of 3.85% [Member]
Debt Instrument [Line Items]
Senior notes	500,000	500,000
2.875% Senior Notes due January 2023, effective interest rate of 3.21% [Member]
Debt Instrument [Line Items]
Senior notes	300,000	300,000
3.125% Senior Notes due July 2023, effective interest rate of 3.26% [Member]
Debt Instrument [Line Items]
Senior notes	500,000	500,000
3.250% Senior Notes due April 2025, effective interest rate 3.36% [Member]
Debt Instrument [Line Items]
Senior notes	400,000	400,000
3.125% Senior Notes due April 2026, effective interest rate of 3.28% [Member]
Debt Instrument [Line Items]
Senior notes	400,000	400,000
3.750% Senior Notes due June 2027, effective interest rate of 3.83% [Member]
Debt Instrument [Line Items]
Senior notes	$ 600,000	$ 600,000