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INVENTORIES (Details) - Summary of Inventories Stated at Lower Cost - USD ($)
$ in Thousands
Mar. 31, 2017
Sep. 30, 2016
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 77,783 $ 81,345
Work in process 92,668 75,852
Finished goods 146,379 151,672
Total $ 316,830 $ 308,869