Accrued Expenses and Other Current Liabilities (Schedule of Product Warranty Accruals) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 684	$ 871
Provision for product warranty - expense	58	88
Adjustments and utilization of warranty accrual	(29)	(168)
Balance at end of period	$ 713	$ 791