Selected Balance Sheet Data (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012
Accounts receivable, net:
Accounts receivable	$ 25,092	$ 24,929
Less allowance for doubtful accounts	388	295
Accounts receivable, net	24,704	24,634
Inventories:
Raw materials	19,953	18,159
Work in process	191	428
Finished goods	5,216	5,848
Inventories	$ 25,360	$ 24,435