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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Nov. 30, 2018 | Feb. 29, 2020 | Feb. 28, 2019
Income Tax Disclosure [Abstract] |  |  |  |  |
U.S. federal statutory income tax rate | 21.00% | 21.00% |  | 21.00% | 21.00%
Effective income tax rate | 108.90% | 33.00% |  | 71.00% | 27.90%
Income tax benefit, Tax Cuts and Jobs Act of 2017 |  |  | $ (13.3) |  |

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