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Income Taxes (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 28, 2018 | Feb. 28, 2018 | Feb. 28, 2018 | Aug. 31, 2019 | Aug. 31, 2018
Income Tax Contingency [Line Items] |  |  |  |  |
Provisional tax liability |  |  | $ 0 |  |
Discrete provisional net benefit | $ 136,800,000 |  |  |  |
Deferred tax benefit |  | $ 41,300,000 |  |  |
Scenario, Forecast |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Corporate Tax Rate |  |  |  | 21.00% | 25.70%

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