Selected Balance Sheet Data (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Sep. 30, 2015
Accounts receivable, net:
Accounts receivable	$ 28,932	$ 28,073
Less allowance for doubtful accounts	363	285
Accounts receivable, net	28,569	27,788
Inventories:
Raw materials	21,195	26,037
Work in process	519	598
Finished goods	3,970	5,242
Inventories	$ 25,684	$ 31,877