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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 18,802 $ 33,690
Work in process 7,926 2,512
Raw material 54,290 70,099
Obsolescence reserve (30,551) (29,614)
Total 50,467 76,687
Less current portion 18,812 20,752
Non-current portion $ 31,655 $ 55,935