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Inventories - Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Sep. 30, 2021
Inventory Disclosure [Abstract]    
Finished goods $ 19,926 $ 19,368
Work in process 3,507 8,247
Raw materials 45,984 43,620
Obsolescence reserve (36,709) (36,936)
Total 32,708 34,299
Less current portion (18,325) (16,196)
Non-current portion $ 14,383 $ 18,103