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Income Taxes (Tables) | 12 Months Ended
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Aug. 31, 2016 | Aug. 31, 2015
Income Tax Disclosure [Abstract] |  |
Schedule of components of income tax expense (benefit) | The provision for income taxes for the years ended August 31, 2016, 2015 and 2014 is as follows:
| 2016 |  | 2015 |  | 2014
| (Dollars in thousands)
Current: |  |  |  |  |
Federal | $ | 3,386 |  |  | $ | (47,695 | ) |  | $ | 38,653 |
State | 3,972 |  |  | 3,891 |  |  | 31,203 |
Foreign | 12,729 |  |  | 1,335 |  |  | 2,837 |
| 20,087 |  |  | (42,469 | ) |  | 72,693 |
Deferred: |  |  |  |  |
Federal | (30,758 | ) |  | 29,348 |  |  | (23,444 | )
State | 8,512 |  |  | (2,799 | ) |  | (1,893 | )
Foreign | (1,932 | ) |  | 3,755 |  |  | 940 |
| (24,178 | ) |  | 30,304 |  |  | (24,397 | )
Total | $ | (4,091 | ) |  | $ | (12,165 | ) |  | $ | 48,296 |
Schedule of deferred tax assets and liabilities |  | Deferred tax assets and liabilities as of August 31, 2016 and 2015 are as follows:
| 2016 |  | 2015
| (Dollars in thousands)
Deferred tax assets: |  |  |  |  |
Accrued expenses | $ | 87,251 |  |  | $ | 96,270 |
Postretirement health care and deferred compensation | 111,983 |  |  | 89,934 |
Tax credit carryforwards | 143,252 |  |  | 109,756 |
Loss carryforwards | 155,966 |  |  | 85,860 |
Other | 64,669 |  |  | 68,625 |
Deferred tax assets valuation | (194,277 | ) |  | (98,024 | )
Total deferred tax assets | 368,844 |  |  | 352,421 |
Deferred tax liabilities: |  |  |  |  |
Pension | 26,516 |  |  | 20,732 |
Investments | 109,610 |  |  | 98,291 |
Major maintenance | 4,970 |  |  | 36,135 |
Property, plant and equipment | 679,266 |  |  | 654,057 |
Other | 33,779 |  |  | 25,836 |
Total deferred tax liabilities | 854,141 |  |  | 835,051 |
Net deferred tax liabilities | $ | 485,297 |  |  | $ | 482,630 |
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, 2016, 2015 and 2014 is as follows:
| 2016 |  | 2015 |  | 2014
Statutory federal income tax rate | 35.0 | % |  | 35.0 | % |  | 35.0 | %
State and local income taxes, net of federal income tax benefit | 0.4 |  |  | (0.5 | ) |  | 1.6 |
Patronage earnings | (23.2 | ) |  | (29.0 | ) |  | (20.5 | )
Domestic production activities deduction | (13.2 | ) |  | (5.6 | ) |  | (10.0 | )
Export activities at rates other than the U.S. statutory rate | 1.5 |  |  | (0.2 | ) |  | 1.2 |
Valuation allowance | 19.6 |  |  | (0.1 | ) |  | 1.7 |
Tax credits | (11.8 | ) |  | (0.8 | ) |  | (3.1 | )
Crack spread contingency | (5.0 | ) |  | (1.7 | ) |  | (0.6 | )
Other | (4.3 | ) |  | 1.3 |  |  | (1.0 | )
Effective tax rate | (1.0 | )% |  | (1.6 | )% |  | 4.3 | %
Schedule of unrecognized tax benefits roll forward | econciliation of the gross beginning and ending amounts of unrecognized tax benefits for the periods presented follows:
| 2016 |  | 2015 |  | 2014
| (Dollars in thousands)
Balance at beginning of period | $ | 72,181 |  |  | $ | 72,181 |  |  | $ | 67,271 |
Additions attributable to current year tax positions | 1,387 |  |  | — |  |  | — |
Additions attributable to prior year tax positions | — |  |  | — |  |  | 35,718 |
Reductions attributable to prior year tax positions | (36,463 | ) |  | — |  |  | (9,867 | )
Reductions attributable to statute expiration | — |  |  | — |  |  | (20,941 | )
Balance at end of period | $ | 37,105 |  |  | $ | 72,181 |  |  | $ | 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=65882285&loc=d3e32639-109319 + Details
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