Selected Balance Sheet Data (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Accounts receivable, net:
Accounts receivable	$ 29,688	$ 28,943
Less allowance for doubtful accounts	483	367
Total accounts receivable, net	29,205	28,576
Inventories:
Raw materials	26,037	26,402
Work in process	598	315
Finished goods	5,242	4,530
Total Inventories	31,877	31,247
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	37,541	35,424
Less accumulated depreciation and amortization	23,184	22,193
Total property, equipment and improvements, net	14,357	13,231	$ 13,910
Land
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	1,800	1,800
Buildings
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	10,522	10,522
Improvements
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	3,328	3,420
Equipment
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	15,691	13,646
Purchased Software
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	3,458	3,559
Furniture and Fixtures
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	$ 2,742	$ 2,477