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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Aug. 31, 2015 | Aug. 31, 2014 | Aug. 31, 2013
Operating Loss Carryforwards [Line Items] |  |  |
Federal | $ 29,348,000 | $ (23,444,000) | $ 92,102,000
Income (Loss) from Continuing Operations before Income Taxes, Domestic | 800,000,000 | 1,200,000,000 | 1,100,000,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 0 | 0 | 200,000
Operating Loss Carryforwards | 431,400,000 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 293,900,000 |  |
Change in valuation allowance for deferred tax asset | 8,800,000 |  |
Current State and Local Tax Expense (Benefit) | 3,891,000 | 31,203,000 | 11,805,000
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 0 | 35,718,000 | $ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 0 | 0 |
Minimum |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 0 |  |
Maximum |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 36,500,000 |  |
Domestic Tax Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Federal | 30,800,000 |  |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Current State and Local Tax Expense (Benefit) | 19,300,000 |  |
Current assets |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net deferred tax assets | 85,000,000 | 86,500,000 |
Other Assets [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 1,600,000 | 2,600,000 |
Foreign tax credit |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 8,000,000 |  |
Alternative Minimum Tax Credit [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 5,600,000 |  |
General Business Tax Credit Carryforward [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 55,700,000 |  |
State tax credits [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 62,200,000 |  |
NCRA [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Loss Carryforwards | 62,200,000 | $ 63,400,000 |
Change in valuation allowance for deferred tax asset | $ 20,100,000 |  |

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