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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Nov. 30, 2018 | Nov. 30, 2017
Income Taxes [Abstract] |  |
Provision for income taxes | 17.60% | 23.70%
Unrecognized tax benefits affected by the resolution of tax examinations or expiring statutes of limitation | $ 0.3 |
Federal income tax rate | 21.00% | 35.00%

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