Fair Value Measurements (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Nov. 30, 2019	Aug. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable and long-term debt	$ 2,490,895	$ 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	$ 399,109	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	399,109	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	$ 413,664	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	$ 498,169	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	498,169	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	$ 529,660	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	$ 299,118	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	299,118	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	$ 321,399	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	$ 494,978	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	494,978	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	$ 517,275	$ 509,845

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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