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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Inventories    
Raw Materials $ 17,935 $ 17,897
Work-in-process 138,859 147,921
Finished Goods 100,590 105,640
Other 1,418 1,587
Total $ 258,802 $ 273,045