Accrued Expenses and Other Current Liabilities (Schedule of Product Warranty Accruals) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Sep. 30, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 1,564	$ 2,435	$ 1,664	$ 2,816
Provision for product warranty - expense	88	113	234	515
Adjustments and utilization of warranty accrual	(550)	(624)	(796)	(1,407)
Balance at end of period	1,102	1,924	1,102	1,924
Current portion	1,102	1,723	1,102	1,723	$ 1,664
Non-current portion	$ 0	$ 201	$ 0	$ 201