Accrued Expenses and Other Current Liabilities (Schedule of Product Warranty Accruals) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 642	$ 684	$ 871
Provision for product warranty - expense	186	431	573
Warranty liability assumed in acquisition liability	80	0	0
Adjustments and utilization of warranty accrual	(254)	(473)	(760)
Balance at end of period	$ 654	$ 642	$ 684