Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Payables And Accruals [Abstract]
Employee bonuses	$ 36	$ 6,611
Product warranty	2,326	951	$ 1,952	$ 2,308
Compensated absences	1,653	1,626
Legal and professional fees	277	275
Payroll	581	665
Property taxes	2,909	2,043
Medical claims	763	852
Other	1,134	1,567
Accrued expenses and other current liabilities	$ 9,679	$ 14,590