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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Inventory Disclosure [Abstract]    
Finished goods $ 17,967 $ 18,802
Work in process 3,681 7,926
Raw materials 55,781 54,290
Obsolescence reserve (32,050) (30,551)
Total 45,379 50,467
Inventories 23,855 18,812
Non-current portion $ 21,524 $ 31,655