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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014
Operating Loss Carryforwards [Line Items] |  |  |
Federal | $ (30,758) | $ 29,348 | $ (23,444)
Income (Loss) from Continuing Operations before Income Taxes, Domestic | 490,800 | 824,900 | 1,200,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 0 |  | 0
Operating Loss Carryforwards | 676,600 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 425,700 |  |
Change in valuation allowance for deferred tax asset | 40,600 |  |
Current State and Local Tax Expense (Benefit) | 3,972 | 3,891 | 31,203
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 0 | 0 | $ 35,718
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 0 | 0 |
Domestic Tax Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Federal | 25,600 |  |
Current assets |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net deferred tax assets |  | 85,000 |
Other Assets [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent |  | 1,600 |
Net deferred tax assets | 2,500 |  |
Alternative Minimum Tax Credit [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 5,600 |  |
General Business Tax Credit Carryforward [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 64,500 |  |
State tax credits [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 133,500 |  |
NCRA [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Loss Carryforwards | 133,500 | $ 62,200 |
Change in valuation allowance for deferred tax asset | $ 55,600 |  |

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