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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 28,533 $ 33,690
Work in process 5,070 2,512
Raw material 68,975 70,099
Obsolescence reserve (31,898) (29,614)
Total 70,680 76,687
Less current portion (21,834) (20,752)
Non-current portion $ 48,846 $ 55,935