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Financing - Schedule of Debt (Detail) - USD ($)
$ in Thousands
Feb. 09, 2019
Aug. 25, 2018
Debt Instrument [Line Items]    
Commercial paper $ 1,428,800 $ 1,325,300
Total debt before discounts and debt issuance costs 5,128,800 5,025,300
Less: Discounts and debt issuance costs 17,599 19,370
Long-term debt 5,111,201 5,005,930
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