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

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Notes Payable and Long-Term Debt (Summary) (Details) - USD ($) $ in Thousands	Aug. 31, 2020	Jul. 13, 2020	Jan. 15, 2020	Aug. 31, 2019
Debt Instrument [Line Items]
Long-term debt	$ 2,728,482			$ 2,496,465
Less current installments of notes payable and long-term debt	50,194			375,181
Notes payable and long-term debt, less current installments	$ 2,678,288			2,121,284
Senior Notes \| 5.625% Senior Notes
Debt Instrument [Line Items]
Senior notes, stated interest rate (as a percent)	5.625%	5.625%
Long-term debt	$ 0			398,886
Senior Notes \| 4.700% Senior Notes
Debt Instrument [Line Items]
Senior notes, stated interest rate (as a percent)	4.70%
Long-term debt	$ 498,659			498,004
Senior Notes \| 4.900% Senior Notes
Debt Instrument [Line Items]
Senior notes, stated interest rate (as a percent)	4.90%
Long-term debt	$ 299,300			299,057
Senior Notes \| 3.950% Senior Notes
Debt Instrument [Line Items]
Senior notes, stated interest rate (as a percent)	3.95%
Long-term debt	$ 495,440			494,825
Senior Notes \| 3.600% Senior Notes
Debt Instrument [Line Items]
Senior notes, stated interest rate (as a percent)	3.60%		3.60%
Long-term debt	$ 494,756			0
Senior Notes \| 3.000% Senior Notes
Debt Instrument [Line Items]
Senior notes, stated interest rate (as a percent)	3.00%	3.00%
Long-term debt	$ 590,162			0
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	0			0
Line of Credit \| Term Loan Facility
Debt Instrument [Line Items]
Long-term debt	$ 350,165			$ 805,693