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Business Acquisition (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Jul. 23, 2013
General Aluminum Forgings, LLC [Member]
Assets acquired:        
Accounts receivable       $ 645
Inventory       1,173
Property and equipment       1,369
Intangible assets       1,100
Goodwill 7,658 7,620 7,015 643
Other       27
Total assets acquired       4,957
Liabilities assumed:        
Accounts payable and accrued liabilities       570
Total assets acquired       $ 4,387