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, 2020	Jan. 15, 2020	Aug. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	$ 2,487,330		$ 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	$ 399,555		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	399,555		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	$ 408,876		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	$ 498,496		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	498,496		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	$ 527,065		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	$ 299,239		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	299,239		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	$ 317,323		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	$ 495,286		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	495,286		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	$ 515,755		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	$ 494,616		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	494,616		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	$ 491,515		$ 0