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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Sep. 30, 2018
Inventory Disclosure [Abstract]    
Finished goods $ 19,713 $ 18,802
Work in process 5,321 7,926
Raw material 55,933 54,290
Obsolescence reserve (31,699) (30,551)
Total 49,268 50,467
Less current portion (17,003) (18,812)
Non-current portion $ 32,265 $ 31,655