Income Taxes - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
Aug. 31, 2019	Aug. 31, 2018
Current:
Expected income tax provision at statutory rate	21.00%	25.70%
Increase (decrease) in taxes due to:
State tax, net of federal benefit	5.20%	5.40%
Permanent differences	0.30%	0.30%
Change in deferred tax asset valuation allowance	(0.70%)	0.00%
Other, net	1.40%	(0.10%)
Income tax expense	27.30%	31.30%

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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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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 valuation allowance for deferred tax assets.

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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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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