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Inventories - Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Sep. 30, 2021
Inventory Disclosure [Abstract]    
Finished goods $ 18,592 $ 19,368
Work in process 3,758 8,247
Raw materials 48,816 43,620
Obsolescence reserve (38,306) (36,936)
Total 32,860 34,299
Less current portion (18,868) (16,196)
Non-current portion $ 13,992 $ 18,103