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Income Taxes - Summary of Tax Rates (Detail)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Federal tax provision (benefit)	35.00%	35.00%	35.00%
State taxes, net of federal effect	3.60%	3.20%	4.40%
Stock based compensation	(0.50%)	0.40%	0.20%
Valuation allowance	(3.20%)	(171.50%)	(42.50%)
Foreign rate differential	0.50%	0.30%	3.00%
Other	(0.30%)	1.30%	0.70%
Effective tax rate	35.10%	(131.30%)	0.80%

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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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