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Inventories - Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Inventory Disclosure [Abstract]    
Finished goods $ 19,368 $ 20,798
Work in process 8,247 984
Raw materials 43,620 47,041
Obsolescence reserve (net realizable value adjustment) (36,936) (34,960)
Total 34,299 33,863
Less current portion 16,196 16,933
Non-current portion $ 18,103 $ 16,930