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Income Taxes - Summary of Tax Rates (Detail)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Federal tax provision	35.00%	21.00%	21.00%	21.00%	24.50%
State taxes, net of federal effect			3.10%	4.10%	4.10%
Stock based compensation			(0.50%)		(2.00%)
Valuation allowance			(0.20%)	(0.10%)	(0.30%)
Foreign rate differential			0.10%	0.20%
Effect of Federal Tax Reform					1.50%
Other			(0.10%)	1.30%	(1.60%)
Effective tax rate			23.40%	26.50%	26.20%

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Effective income tax rate reconciliation non deductible expense share based compensation cost income.

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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 attributable to changes in the income tax rates.

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