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Basis of Presentation - Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Percentage of weighted average cost inventory	90.00%
Inventory, Net [Abstract]
Purchased parts and raw materials	$ 19,201	$ 19,644
Work-in-process	2,978	2,328
Finished goods	2,551	3,698
Inventory	$ 24,730	$ 25,670

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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