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Inventories (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019
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Inventories, net [Abstract] |  |
Raw materials | $ 38,220 | $ 35,616
Work in process | 79,108 | 76,297
Finished goods | 68,280 | 68,361
Inventories | $ 185,608 | $ 180,274

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