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Notes Payable and Long-Term Debt Phantom (Details) $ in Millions	12 Months Ended
	Aug. 31, 2015 USD ($)
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	1.30%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	15.25%
Unsecured debt | Private placement, payable in equal installments beginning in 2014 through 2018
Debt Instrument [Line Items]
Interest rate	6.18%
Debt Instrument, Face Amount	$ 400
Unsecured debt | Private placement, payable in installments through 2018
Debt Instrument [Line Items]
Interest rate	5.60%
Debt Instrument, Face Amount	$ 60
Unsecured debt | Private placement, payable in equal installments beginning in 2011 through 2015
Debt Instrument [Line Items]
Interest rate	5.25%
Debt Instrument, Face Amount	$ 125
Unsecured debt | Private placement, payable in its entirety in 2019
Debt Instrument [Line Items]
Interest rate	4.08%
Debt Instrument, Face Amount	$ 130
Unsecured debt | Private placement, payable in its entirety in 2021
Debt Instrument [Line Items]
Interest rate	4.52%
Debt Instrument, Face Amount	$ 160
Unsecured debt | Private placement, payable in its entirety in 2023
Debt Instrument [Line Items]
Interest rate	4.67%
Debt Instrument, Face Amount	$ 130
Unsecured debt | Private placement, payable in 2025 80k [Member]
Debt Instrument [Line Items]
Interest rate	3.85%
Debt Instrument, Face Amount	$ 80
Unsecured debt | Private placement, payable in 2025 100k [Member]
Debt Instrument [Line Items]
Interest rate	3.80%
Debt Instrument, Face Amount	$ 100
Unsecured debt | Private placement, payable in its entirety in 2026
Debt Instrument [Line Items]
Interest rate	4.82%
Debt Instrument, Face Amount	$ 80
Unsecured debt | Private placement, payable in its entirety 2033 [Member]
Debt Instrument [Line Items]
Interest rate	4.71%
Debt Instrument, Face Amount	$ 100
Notes Payable, Other Payables [Member] | Private placement, note purchase and private shelf agreement with Prudential Capital Group, payable in equal installments beginning in 2014 through 2018
Debt Instrument [Line Items]
Interest rate	5.78%
Debt Instrument, Face Amount	$ 50
Notes Payable, Other Payables [Member] | Private placement, note purchase and private shelf agreement with Prudential Capital Group, payable in equal installments beginning in 2017 through 2021 [Member]
Debt Instrument [Line Items]
Interest rate	4.00%
Debt Instrument, Face Amount	$ 100
Revolving credit facility | Line of credit | Revolving term loans from cooperative and other banks
Debt Instrument [Line Items]
Interest rate	5.59%

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 835



-SubTopic 30



-Section 55



-Paragraph 8



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Reference 1: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



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