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Income Taxes - Summary of Tax Rates (Detail)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Income Tax Disclosure [Abstract]      
Federal tax benefit (provision) (35.00%) (35.00%) (35.00%)
State taxes, net of federal effect (4.40%) 0.70% 16.80%
Stock based compensation (0.20%) (0.60%) (7.50%)
Valuation allowance 42.50% 45.00% 50.20%
Federal NOL carryback 0.00% 0.00% 12.60%
Foreign rate differential (3.00%) (2.90%) (15.40%)
Other (0.70%) (0.90%) (2.70%)
Effective tax rate (0.80%) 6.30% 19.00%