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INVENTORIES (Details) - Summary of Inventories Stated at Lower Cost - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 84,249 $ 81,345
Work in process 97,390 75,852
Finished goods 157,754 151,672
Total $ 339,393 $ 308,869