PROPERTY, PLANT AND EQUIPMENT - Summary of Property Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 635,968	$ 706,961
Accumulated depreciation and amortization	(373,345)	(412,400)
Total	262,623	294,561
Land, building and building improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	159,689	159,693
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	439,989	511,779
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 36,290	$ 35,489