PROPERTY, PLANT AND EQUIPMENT (Details) - Summary of Property Plant and Equipment - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 739,668	$ 725,282
Accumulated depreciation and amortization	(406,816)	(382,790)
Total	332,852	342,492
Land, building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	132,334	130,296
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	557,351	544,875
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 49,983	$ 50,111