Notes Payable and Long-Term Debt (Amounts Outstanding) (Details) - USD ($)	Nov. 30, 2019	Aug. 31, 2019
Debt Instrument [Line Items]
Long-term debt	$ 2,490,895,000	$ 2,496,465,000
Less current installments of notes payable and long-term debt	375,180,000	375,181,000
Notes payable and long-term debt, less current installments	2,115,715,000	2,121,284,000
Commercial paper, borrowing capacity	$ 1,800,000,000
Senior Notes \| 5.625% Senior Notes
Debt Instrument [Line Items]
Senior Notes, stated interest rate	5.625%
Long-term debt	$ 399,109,000	398,886,000
Senior Notes \| 4.700% Senior Notes
Debt Instrument [Line Items]
Senior Notes, stated interest rate	4.70%
Long-term debt	$ 498,169,000	498,004,000
Senior Notes \| 4.900% Senior Notes
Debt Instrument [Line Items]
Senior Notes, stated interest rate	4.90%
Long-term debt	$ 299,118,000	299,057,000
Senior Notes \| 3.950% Senior Notes
Debt Instrument [Line Items]
Senior Notes, stated interest rate	3.95%
Long-term debt	$ 494,978,000	494,825,000
Line of Credit \| Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	0	0
Unused borrowing capacity	2,600,000,000
Line of Credit \| Term Loan Facility \| Term Loan Facility
Debt Instrument [Line Items]
Long-term debt	$ 799,521,000	$ 805,693,000

Maximum borrowing capacity under the commercial paper program.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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