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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Sep. 30, 2018
Inventory Disclosure [Abstract]    
Finished goods $ 18,750 $ 18,802
Work in process 3,745 7,926
Raw material 58,570 54,290
Obsolescence reserve (31,503) (30,551)
Total 49,562 50,467
Less current portion (15,525) (18,812)
Non-current portion $ 34,037 $ 31,655