PROPERTY, PLANT AND EQUIPMENT - Summary of Property Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 770,775	$ 763,542
Accumulated depreciation and amortization	(438,627)	(426,216)
Total	332,148	337,326
Land, building and building improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	143,942	133,036
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	576,230	580,698
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 50,603	$ 49,808

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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