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Benefit Plans - Schedule of Pension Plans' Fair Value Measurements (Details) - Pension Plans, Defined Benefit - USD ($) $ in Thousands | Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | $ 875,820 | $ 883,265 | $ 796,379
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 9,988 | 4,841 |
Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 459 | 507 |
Equity Securities: Common/collective trust [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 231,228 | 228,717 |
Fixed Income Securities: Common/collective trust [Member] [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 535,185 | 551,604 |
Partnership and joint venture interests |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 96,994 | 95,744 |
Other assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 1,966 | 1,852 |
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 10,447 | 5,348 |
Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 9,988 | 4,841 |
Level 1 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 459 | 507 |
Level 1 | Equity Securities: Common/collective trust [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 0 | 0 |
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 | Other assets |  |  |
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 | 0 | 0 |
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 | 0 |
Level 2 | Equity Securities: Common/collective trust [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 0 | 0 |
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 | Other assets |  |  |
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 | 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 | Other assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | $ 0 | $ 0 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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=82843861&loc=d3e1928-114920 + Details
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