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INVENTORIES (Details) - Summary of Inventories Stated at Lower Cost - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 91,400 $ 67,990
Work in process 88,261 78,846
Finished goods 216,152 152,601
Total $ 395,813 $ 299,437