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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018 | Aug. 31, 2018
Income Taxes [Abstract] |  |  |  |  |
Provision for income taxes | 18.70% | 18.70% | 18.20% | 21.10% |
Unrecognized tax benefits affected by the resolution of tax examinations or expiring statutes of limitation | $ 0.2 |  | $ 0.2 |  |
Federal income tax rate |  |  | 21.00% |  |
Percentage between blended rate and prior fiscal year |  |  |  |  | 25.70%

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