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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Sep. 30, 2016
Inventory Disclosure [Abstract]    
Finished goods $ 34,929 $ 40,260
Work in process 2,943 8,272
Raw material 71,646 65,682
Obsolescence reserve (17,415) (9,674)
Total $ 92,103 $ 104,540