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Benefit Plans - Schedule of Pension Plans' Fair Value Measurements (Details) (Pension Plans, Defined Benefit, USD $) | Aug. 31, 2014 | Aug. 31, 2013 | Aug. 31, 2012
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | $ 822,125,000 | $ 730,628,000 | $ 688,196,000
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 227,506,000 | 190,378,000 |
Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 4,218,000 | 667,000 |
Level 1 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 84,830,000 | 113,982,000 |
Level 1 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 138,458,000 | 75,729,000 |
Level 1 | Partnership and joint venture interests |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 0 | 0 |
Level 1 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 0 | 0 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 583,168,000 | 516,629,000 |
Level 2 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 0 | 0 |
Level 2 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 66,485,000 | 80,619,000 |
Level 2 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 488,526,000 | 409,996,000 |
Level 2 | Partnership and joint venture interests |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 28,157,000 | 26,014,000 |
Level 2 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 0 | 0 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 11,451,000 | 23,621,000 |
Level 3 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 0 | 0 |
Level 3 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 0 | 0 |
Level 3 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 1,749,000 | 1,940,000 |
Level 3 | Partnership and joint venture interests |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 9,492,000 | 3,403,000 |
Level 3 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 210,000 | 18,278,000 |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 822,125,000 | 730,628,000 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 4,218,000 | 667,000 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 151,315,000 | 194,601,000 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 628,733,000 | 487,665,000 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Partnership and joint venture interests |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 37,649,000 | 29,417,000 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | $ 210,000 | $ 18,278,000 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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