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Income Taxes - Summary of Tax Rates (Detail)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Federal tax provision (benefit)	35.00%	35.00%	35.00%
State taxes, net of federal effect	4.40%	3.60%	3.20%
Worthless stock deduction	(4.80%)
Stock based compensation	0.20%	(0.50%)	0.40%
Valuation allowance	(0.10%)	(3.20%)	(171.50%)
Foreign rate differential	2.40%	0.50%	0.30%
Other	0.60%	(0.30%)	1.30%
Effective tax rate	37.70%	35.10%	(131.30%)

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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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