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INVENTORIES (Details) - Summary of inventories stated at lower cost - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 135,083 $ 121,791
Work in process 81,624 93,830
Finished goods 197,118 226,500
Total $ 413,825 $ 442,121