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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) (USD $) | Aug. 31, 2014 | Aug. 31, 2013
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards | $ 247,800,000 |
Deferred Tax Assets, Gross [Abstract] |  |
Accrued expenses | 76,255,000 | 66,973,000
Postretirment health care and deferred compensation | 83,346,000 | 57,130,000
Deferred Tax Assets, Tax Credit Carryforwards | 70,881,000 | 97,242,000
Deferred Tax Assets, Operating Loss Carryforwards | 53,793,000 | 57,174,000
Other | 52,956,000 | 40,868,000
Deferred tax assets valuation | (111,509,000) | (79,623,000)
Deferred tax assets | 225,722,000 | 239,764,000
Deferred Tax Liabilities, Gross [Abstract] |  |
Pension | 12,855,000 | 6,752,000
Investments | 88,425,000 | 91,453,000
Major maintenance | 26,020,000 | 31,960,000
Property, plant and equipment | 576,007,000 | 529,101,000
Deferred Tax Liabilities, Gross | 703,307,000 | 659,266,000
Net deferred tax liabilities | 477,585,000 | 419,502,000
NCRA [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards | $ 63,400,000 | $ 88,100,000

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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