Detail of Selected Balance Sheet Accounts (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011
Components of inventories
Raw materials, parts and subassemblies	$ 41,207	$ 38,400
Work-in-progress	7,967	5,892
Provision for excess and obsolete inventory	(8,558)	(7,652)
Total inventories	$ 40,616	$ 36,640

The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Research Bulletin (ARB)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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+ Details