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Financing - Schedule of Debt (Detail) - USD ($) $ in Thousands | Feb. 15, 2020 | Aug. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Commercial paper | $ 1,272,700 | $ 1,030,000
Total debt before discounts and debt issuance costs | 5,472,700 | 5,230,000
Less: Discounts and debt issuance costs | 21,229 | 23,656
Long-term debt | 5,451,471 | 5,206,344
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
3.125% Senior Notes due April 2024, effective interest rate 3.32% [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes | 300,000 | 300,000
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
3.750% Senior Notes due April 2029, effective interest rate of 3.86% [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes | $ 450,000 | $ 450,000

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