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Benefit Plans - Schedule of Pension Plans' Fair Value Measurements (Details) - Pension Plans, Defined Benefit - USD ($) $ in Thousands | Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | $ 883,265 | $ 796,379 | $ 822,125
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 4,841 | 4,882 |
Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 507 | 91,619 |
Equity Securities: Common/collective trust [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 228,717 | 194,463 |
Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value |  | 154,116 |
Fixed Income Securities: Common/collective trust [Member] [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 551,604 | 296,684 |
Partnership and joint venture interests |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 95,744 | 52,640 |
Other assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 1,852 | 1,975 |
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 5,348 | 230,057 |
Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 4,841 | 4,882 |
Level 1 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value | 507 | 91,619 |
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 |
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 | 20,560 |
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 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value |  | 20,560 |
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 | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans assets, fair value |  | 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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