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Inventories - Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Sep. 30, 2019
Inventory Disclosure [Abstract]    
Finished goods $ 16,940 $ 17,967
Work in process 4,733 3,681
Raw materials 47,809 55,781
Obsolescence reserve (34,144) (32,050)
Total 35,338 45,379
Less current portion (18,488) (23,855)
Non-current portion $ 16,850 $ 21,524