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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |
Income tax expense (benefit) | $ (12,456) | $ (104,076) | $ (181,124)
Deferred Tax Liabilities, Net | 142,900 | 182,361 |
Income (Loss) from Continuing Operations before Income Taxes, Domestic | 825,700 | 717,400 | 158,500
Income (Loss) from Continuing Operations before Income Taxes, Foreign | $ (3,100) | $ (46,200) | $ (268,700)
Statutory federal income tax rate | 21.00% | 25.70% | 35.00%
Operating Loss Carryforwards | $ 626,400 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 363,600 |  |
Change in valuation allowance for deferred tax asset | 15,100 |  |
Amount of unrecognized tax benefits that would benefit effective tax rate | 93,300 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Expense | 1,700 | $ 1,200 |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 2,900 | 1,200 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 0 | 0 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 0 |  |
Other assets |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 100 | 400 |
State tax credit |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 123,000 |  |
Alternative minimum tax credit |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 14,100 |  |
Low sulfer diesel credits |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 79,300 |  |
NCRA |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Change in valuation allowance for deferred tax asset | 800 |  |
NCRA | State tax credit |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 123,300 | $ 121,600 |
Foreign tax authority | Fiscal year 2018 |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | $ 11,200 |  |

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