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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%

X

- Definition

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Effective Income Tax Rate Reconciliation, At Federal Statutory Income Tax Rate, Difference Between Statutory Rate And Blended Rate, Percent

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