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Organization, Basis of Presentation and Significant Accounting Policies (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2018 USD ($) | Aug. 31, 2018 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |
Intangible assets with indefinite useful lives | $ 0 | $ 0
Tax Act, provisionally recorded net benefit, revaluation of U.S. net deferred tax liability |  | 155,200
Reclassification of tax effects to retained earnings |  | 0
Accumulated Other Comprehensive Loss |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Reclassification of tax effects to retained earnings | (27,000) | (26,992)
Capital Reserves |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Reclassification of tax effects to retained earnings | $ 27,000 | $ 26,992
Minimum | Major Maintenance Activities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Expenditures of turnarounds, capitalization period |  | 2 years
Minimum | Other Intangible Assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Expenditures of turnarounds, capitalization period |  | 2 years
Minimum | Land improvements |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Property, plant and equipment, useful life |  | 15 years
Minimum | Buildings |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Property, plant and equipment, useful life |  | 20 years
Minimum | Machinery and equipment |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Property, plant and equipment, useful life |  | 5 years
Minimum | Office equipment and other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Property, plant and equipment, useful life |  | 3 years
Maximum | Major Maintenance Activities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Expenditures of turnarounds, capitalization period |  | 4 years
Maximum | Other Intangible Assets |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Expenditures of turnarounds, capitalization period |  | 30 years
Maximum | Land improvements |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Property, plant and equipment, useful life |  | 20 years
Maximum | Buildings |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Property, plant and equipment, useful life |  | 40 years
Maximum | Machinery and equipment |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Property, plant and equipment, useful life |  | 20 years
Maximum | Office equipment and other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Property, plant and equipment, useful life |  | 10 years

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