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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Feb. 28, 2018 | Feb. 28, 2017 | May 31, 2018 | May 31, 2017 | Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) | $ 7,787 | $ 55,219 | $ (187,688) | $ 20,606 | $ (34,761) | $ (166,124) | $ 3,685 | $ 16,076 | $ (167,082) | $ 19,761 | $ (111,863) | $ (146,363) | $ (104,076) | $ (181,124) | $ 19,099
Deferred Tax Liabilities, Net | 182,361 |  |  |  | 328,803 |  |  |  |  |  |  |  | 182,361 | 328,803 |
Income (Loss) from Continuing Operations before Income Taxes, Domestic |  |  |  |  |  |  |  |  |  |  |  |  | 717,400 | 158,500 | 473,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign |  |  |  |  |  |  |  |  |  |  |  |  | $ (46,200) | $ (268,700) | $ (70,900)
Statutory federal income tax rate |  |  |  |  |  |  |  |  |  |  |  |  | 25.70% | 35.00% | 35.00%
Tax Act, provisionally recorded net benefit, revaluation of U.S. net deferred tax liability |  |  |  |  |  |  |  |  |  |  |  |  | $ 155,200 |  |
Operating Loss Carryforwards | 531,100 |  |  |  |  |  |  |  |  |  |  |  | 531,100 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 342,800 |  |  |  |  |  |  |  |  |  |  |  | 342,800 |  |
Change in valuation allowance for deferred tax asset |  |  |  |  |  |  |  |  |  |  |  |  | 33,800 |  |
Amount of unrecognized tax benefits that would benefit effective tax rate | 83,300 |  |  |  |  |  |  |  |  |  |  |  | 83,300 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Expense |  |  |  |  |  |  |  |  |  |  |  |  | 1,200 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 1,200 |  |  |  |  |  |  |  |  |  |  |  | 1,200 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 | $ 0 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 400 |  |  |  | 1,200 |  |  |  |  |  |  |  | 400 | 1,200 |
State tax credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, amount | 121,600 |  |  |  |  |  |  |  |  |  |  |  | 121,600 |  |
Alternative minimum tax credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, amount | 6,100 |  |  |  |  |  |  |  |  |  |  |  | 6,100 |  |
Low sulfer diesel credits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, amount | 61,200 |  |  |  |  |  |  |  |  |  |  |  | 61,200 |  |
NCRA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in valuation allowance for deferred tax asset |  |  |  |  |  |  |  |  |  |  |  |  | 17,000 |  |
NCRA | State tax credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, amount | 121,600 |  |  |  | 172,900 |  |  |  |  |  |  |  | 121,600 | 172,900 |
Foreign tax authority | Fiscal year 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, amount | $ 11,200 |  |  |  |  |  |  |  |  |  |  |  | $ 11,200 |  |
Restatement Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  | (5,119) | (6,512) | 670 | 9,532 | (3,106) | (4,939) | (536) | (5,842) | (5,475) | (10,962) | (8,582) |  | 951 | $ 23,190
As Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  | $ 60,338 | $ (181,176) | $ 19,936 | (44,293) | $ (163,018) | $ 8,624 | $ 16,612 | $ (161,240) | $ 25,236 | $ (100,901) | $ (137,781) |  | (182,075) | $ (4,091)
Deferred Tax Liabilities, Net |  |  |  |  | $ 3,700 |  |  |  |  |  |  |  |  | $ 3,700 |

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