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Organization, Basis of Presentation and Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Nov. 30, 2016 | Nov. 30, 2015 | Aug. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Capitalized Maintenance Expense, Deferred During the Period | $ 0.3 | $ 18.9 |
Minimum [Member] | Major Maintenance Activities Requiring Shutdown [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 2 years |  |
Maximum [Member] | Major Maintenance Activities Requiring Shutdown [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 4 years |  |
Other Assets [Member] | Accounting Standards Update 2015-03 [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Debt Issuance Costs, Net |  |  | $ (5.6)
Long-term Debt [Member] | Accounting Standards Update 2015-03 [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Debt Issuance Costs, Net |  |  | $ 5.6

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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