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

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Fair Value Measurements (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	May 31, 2021	Apr. 14, 2021	Aug. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	$ 2,926,767		$ 2,728,482
Senior Notes \| 4.700% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes, stated interest rate (as a percent)	4.70%
Notes payable and long-term debt	$ 499,150		498,659
Senior Notes \| 4.700% Senior Notes \| Level 2 \| Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	499,150		498,659
Senior Notes \| 4.700% Senior Notes \| Level 2 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	$ 527,780		537,180
Senior Notes \| 4.900% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes, stated interest rate (as a percent)	4.90%
Notes payable and long-term debt	$ 299,482		299,300
Senior Notes \| 4.900% Senior Notes \| Level 3 \| Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	299,482		299,300
Senior Notes \| 4.900% Senior Notes \| Level 3 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	$ 325,411		329,435
Senior Notes \| 3.950% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes, stated interest rate (as a percent)	3.95%
Notes payable and long-term debt	$ 495,902		495,440
Senior Notes \| 3.950% Senior Notes \| Level 2 \| Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	495,902		495,440
Senior Notes \| 3.950% Senior Notes \| Level 2 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	$ 555,460		551,930
Senior Notes \| 3.600% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes, stated interest rate (as a percent)	3.60%
Notes payable and long-term debt	$ 495,146		494,756
Senior Notes \| 3.600% Senior Notes \| Level 2 \| Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	495,146		494,756
Senior Notes \| 3.600% Senior Notes \| Level 2 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	$ 538,850		536,110
Senior Notes \| 3.000% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes, stated interest rate (as a percent)	3.00%
Notes payable and long-term debt	$ 590,944		590,162
Senior Notes \| 3.000% Senior Notes \| Level 2 \| Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	590,944		590,162
Senior Notes \| 3.000% Senior Notes \| Level 2 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	$ 610,830		611,616
Senior Notes \| 1.700% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes, stated interest rate (as a percent)	1.70%	1.70%
Notes payable and long-term debt	$ 495,560		0
Senior Notes \| 1.700% Senior Notes \| Level 2 \| Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	495,560		0
Senior Notes \| 1.700% Senior Notes \| Level 2 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	$ 502,340		$ 0