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INVENTORIES - Summary of Inventories Stated at Lower Cost (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 134,378 $ 135,083
Work in process 79,209 81,624
Finished goods 231,435 197,118
Total $ 445,022 $ 413,825