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Income Taxes (Tables) | 12 Months Ended
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Aug. 31, 2017 | Aug. 31, 2016
Income Tax Disclosure [Abstract] |  |
Schedule of components of income tax expense (benefit) | The provision for income taxes for the years ended August 31, 2017, 2016, and 2015 is as follows:
| 2017 |  | 2016 |  | 2015
| (Dollars in thousands)
Current: |  |  |  |  |
Federal | $ | (1,767 | ) |  | $ | 3,386 |  |  | $ | (47,695 | )
State | 2,695 |  |  | 3,972 |  |  | 3,891 |
Foreign | (7,088 | ) |  | 12,729 |  |  | 1,335 |
| (6,160 | ) |  | 20,087 |  |  | (42,469 | )
Deferred: |  |  |  |  |
Federal | (162,223 | ) |  | (30,758 | ) |  | 29,348 |
State | (15,977 | ) |  | 8,512 |  |  | (2,799 | )
Foreign | 2,285 |  |  | (1,932 | ) |  | 3,755 |
| (175,915 | ) |  | (24,178 | ) |  | 30,304 |
Total | $ | (182,075 | ) |  | $ | (4,091 | ) |  | $ | (12,165 | )
Schedule of deferred tax assets and liabilities |  | Deferred tax assets and liabilities as of August 31, 2017, and 2016, are as follows:
| 2017 |  | 2016
| (Dollars in thousands)
Deferred tax assets: |  |  |  |  |
Accrued expenses | $ | 226,964 |  |  | $ | 87,251 |
Postretirement health care and deferred compensation | 82,682 |  |  | 111,983 |
Tax credit carryforwards | 166,213 |  |  | 143,252 |
Loss carryforwards | 169,724 |  |  | 155,966 |
Nonqualified equity | 152,835 |  |  | 30,168 |
Other | 55,119 |  |  | 30,627 |
Deferred tax assets valuation | (284,716 | ) |  | (194,277 | )
Total deferred tax assets | 568,821 |  |  | 364,970 |
Deferred tax liabilities: |  |  |  |  |
Pension | 31,050 |  |  | 26,516 |
Investments | 129,985 |  |  | 107,716 |
Major maintenance | 2,115 |  |  | 4,970 |
Property, plant and equipment | 712,195 |  |  | 681,160 |
Other | 25,964 |  |  | 29,905 |
Total deferred tax liabilities | 901,309 |  |  | 850,267 |
Net deferred tax liabilities | $ | 332,488 |  |  | $ | 485,297 |
Schedule of effective income tax rate reconciliation | The reconciliation of the statutory federal income tax rates to the effective tax rates for the years ended August 31, 2017, 2016, and 2015 is as follows:
| 2017 |  | 2016 |  | 2015
Statutory federal income tax rate | 35.0 | % |  | 35.0 | % |  | 35.0 | %
State and local income taxes, net of federal income tax benefit | 24.7 |  |  | 0.4 |  |  | (0.5 | )
Patronage earnings | 192.0 |  |  | (23.2 | ) |  | (29.0 | )
Domestic production activities deduction | 64.7 |  |  | (13.2 | ) |  | (5.6 | )
Export activities at rates other than the U.S. statutory rate | 145.3 |  |  | 1.5 |  |  | (0.2 | )
Valuation allowance | (182.3 | ) |  | 19.6 |  |  | (0.1 | )
Tax credits | 45.8 |  |  | (11.8 | ) |  | (0.8 | )
Crack spread contingency | 9.6 |  |  | (5.0 | ) |  | (1.7 | )
Other | (2.9 | ) |  | (4.3 | ) |  | 1.3 |
Effective tax rate | 331.9 | % |  | (1.0 | )% |  | (1.6 | )%
Schedule of unrecognized tax benefits roll forward |
| 2017 |  | 2016 |  | 2015
| (Dollars in thousands)
Balance at beginning of period | $ | 37,105 |  |  | $ | 72,181 |  |  | $ | 72,181 |
Additions attributable to current year tax positions | 725 |  |  | 1,387 |  |  | — |
Reductions attributable to prior year tax positions | — |  |  | (36,463 | ) |  | — |
Balance at end of period | $ | 37,830 |  |  | $ | 37,105 |  |  | $ | 72,181 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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