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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 22,880 $ 33,690
Work in process 8,045 2,512
Raw material 54,403 70,099
Obsolescence reserve (31,014) (29,614)
Total 54,314 76,687
Less current portion (18,959) (20,752)
Non-current portion $ 35,355 $ 55,935