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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2019	May 31, 2018	Aug. 31, 2018
Income Taxes [Abstract]
Provision for income taxes	19.80%	24.30%	18.80%	22.30%
Unrecognized tax benefits affected by the resolution of tax examinations or expiring statutes of limitation	$ 0.3		$ 0.3
Federal income tax rate			21.00%		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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