PROPERTY, PLANT AND EQUIPMENT (Details) - Summary of property plant and equipment - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 815,517
Property, plant and equipment, gross		$ 763,542
Accumulated depreciation and amortization	(471,553)
Accumulated depreciation and amortization		(426,216)
Total	343,964
Total		337,326
Land, building and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	167,005
Property, plant and equipment, gross		133,036
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	595,126
Property, plant and equipment, gross		580,698
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 53,386
Property, plant and equipment, gross		$ 49,808