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Notes Payable and Long-Term Debt Phantom (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Aug. 31, 2014
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 equal installments through 2013 [Member] |
Debt Instrument [Line Items] |
Interest rate | 6.81%
Debt Instrument, Face Amount | 225
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%

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- 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Minimum contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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