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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Inventories    
Raw Materials $ 20,065 $ 18,731
Work-in-process 150,404 130,019
Finished Goods 95,833 94,331
Other 1,568 1,376
Total $ 267,870 $ 244,457