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Income Taxes - Summary of Tax Rates (Detail)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Tax Disclosure [Abstract]
Federal tax (benefit) provision	35.00%	35.00%	(35.00%)
State taxes, net of federal effect	(0.70%)	(16.80%)	(6.80%)
Stock based compensation	0.60%	7.50%	0.70%
Valuation allowance	(45.00%)	(50.20%)	39.50%
Federal NOL carryback	0.00%	(12.60%)	(2.00%)
Foreign rate differential	2.90%	15.40%	0.00%
Other	0.90%	2.70%	0.50%
Effective tax rate	(6.30%)	(19.00%)	(3.10%)

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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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