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Inventories (Schedule of Inventory, Current by major category) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Inventory Disclosure [Abstract]    
Purchased components $ 25,958us-gaap_InventoryPartsAndComponentsNetOfReserves $ 21,677us-gaap_InventoryPartsAndComponentsNetOfReserves
Work-in-process 25,241us-gaap_InventoryWorkInProcessNetOfReserves 27,058us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 36,906us-gaap_InventoryFinishedGoodsNetOfReserves 36,358us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories $ 88,105us-gaap_InventoryNet $ 85,093us-gaap_InventoryNet [1]
[1] Derived from audited financial statements.