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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 32,768 $ 33,690
Work in process 5,837 2,512
Raw material 68,078 70,099
Obsolescence reserve (30,505) (29,614)
Total 76,178 76,687
Less current portion (19,994) (20,752)
Non-current portion $ 56,184 $ 55,935