Inventories (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Inventories
Finished goods and sub-assemblies	$ 32,845	$ 20,430
Work in progress	19,585	14,255
Raw materials	40,788	47,257
Obsolescence reserve	(9,324)	(9,552)
Total	$ 83,894	$ 72,390