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Inventories (Schedule of Inventory)(Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Inventory Disclosure [Abstract]    
Raw materials and purchased parts $ 189,317 $ 189,517
Work in progress 254,059 229,202
Finished goods 74,623 70,408
Inventories $ 517,999 $ 489,127