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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019
Operating Loss Carryforwards [Line Items] |  |  |
Income tax benefit | $ (38,249) | $ (36,731) | $ (12,456)
Deferred Tax Liabilities, Net | 101,528 | 139,343 |
Income (Loss) from Continuing Operations before Income Taxes, Domestic | 497,500 | 324,400 | 825,700
Income (Loss) from Continuing Operations before Income Taxes, Foreign | $ 17,800 | $ 62,500 | $ (3,100)
Statutory federal income tax rate | 21.00% | 21.00% | 21.00%
Operating Loss Carryforwards | $ 527,500 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 304,400 |  |
Amount of unrecognized tax benefits that would benefit effective tax rate | 114,300 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Expense | 1,400 | $ 1,000 | $ 1,700
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 2,500 | 1,000 | $ 2,900
State tax credit |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 129,700 |  |
Low sulfer diesel credits |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 44,100 |  |
NCRA | State tax credit |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | $ 129,700 | $ 125,500 |

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