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Financing - Schedule of Debt (Detail) - USD ($)
$ in Thousands
Nov. 23, 2019
Aug. 31, 2019
Debt Instrument [Line Items]    
Commercial paper $ 1,109,700 $ 1,030,000
Total debt before discounts and debt issuance costs 5,309,700 5,230,000
Less: Discounts and debt issuance costs 22,376 23,656
Long-term debt 5,287,324 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