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Benefit Plans - Schedule of Pension Plans' Fair Value Measurements (Details) - Pension Plans, Defined Benefit - USD ($) $ in Thousands | Aug. 31, 2015 | Aug. 31, 2014 | Aug. 31, 2013
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | $ 796,379 | $ 822,125 | $ 730,628
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 4,882 | 4,218 |
Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 91,619 | 102,915 |
Equity Securities: Common/collective trust [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 194,463 | 48,400 |
Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 154,116 | 147,184 |
Fixed Income Securities: Common/collective trust [Member] [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 296,684 | 479,800 |
Partnership and joint venture interests |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 52,640 | 37,649 |
Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 1,975 | 1,959 |
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 230,057 | 227,506 |
Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 4,882 | 4,218 |
Level 1 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 91,619 | 84,830 |
Level 1 | Equity Securities: Common/collective trust [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 0 | 0 |
Level 1 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 133,556 | 138,458 |
Level 1 | Fixed Income Securities: Common/collective trust [Member] [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 0 | 0 |
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 | 20,560 | 26,811 |
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 | 0 | 18,085 |
Level 2 | Equity Securities: Common/collective trust [Member] |  |  |
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 | 20,560 | 8,726 |
Level 2 | Fixed Income Securities: Common/collective trust [Member] [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 0 | 0 |
Level 2 | Partnership and joint venture interests |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 0 | 0 |
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 | 0 | 0 |
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 | Equity Securities: Common/collective trust [Member] |  |  |
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 | Fixed Income Securities: Common/collective trust [Member] [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 0 | 0 |
Level 3 | Partnership and joint venture interests |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 0 | 0 |
Level 3 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | $ 0 | $ 0 |

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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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: 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=58740216&loc=d3e1928-114920 + Details
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