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	Feb. 29, 2020	Jan. 15, 2020	Aug. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	$ 2,724,200		$ 2,496,465
Senior Notes \| 5.625% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, stated interest rate	5.625%
Notes payable and long-term debt	$ 399,332		398,886
Senior Notes \| 5.625% Senior Notes \| Level 2 \| Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	399,332		398,886
Senior Notes \| 5.625% Senior Notes \| Level 2 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	$ 409,692		416,000
Senior Notes \| 4.700% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, stated interest rate	4.70%
Notes payable and long-term debt	$ 498,332		498,004
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	498,332		498,004
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	$ 535,370		525,890
Senior Notes \| 4.900% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, stated interest rate	4.90%
Notes payable and long-term debt	$ 299,178		299,057
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	299,178		299,057
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	$ 326,619		318,704
Senior Notes \| 3.950% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, stated interest rate	3.95%
Notes payable and long-term debt	$ 495,132		494,825
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	495,132		494,825
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	$ 539,835		509,845
Senior Notes \| 3.600% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior Notes, stated interest rate	3.60%	3.60%
Notes payable and long-term debt	$ 494,470		0
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	494,470		0
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	$ 510,905		$ 0