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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Sep. 30, 2019
Inventories    
Raw Materials $ 21,747 $ 17,935
Work-in-process 142,879 138,859
Finished Goods 114,165 100,590
Other 1,546 1,418
Total $ 280,337 $ 258,802