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Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Income Taxes [Line Items]
Income tax expense	$ 2,685,000	$ 1,351,000	$ 2,472,000	$ 4,261,000
Estimated annual effective income tax rate			23.70%	23.50%
Tax adjustment for unusual items			$ (2,600,000)	$ 0
Foreign Jurisdiction [Member]
Income Taxes [Line Items]
Valuation allowance	$ 1,700,000		$ 1,700,000

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Income taxes.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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