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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%

X

- Definition

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

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X

- Definition

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

+ References

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- Definition

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

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