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ACQUISITIONS (Details) - Schedule of Intangible Assets Acquired in Cornell Cookson Acquisition (Details) - USD ($)
$ in Thousands
Jun. 04, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]        
Goodwill   $ 442,643 $ 437,067 $ 439,395
CornellCookson        
Business Acquisition [Line Items]        
Goodwill $ 43,183      
Indefinite-lived intangibles 53,500      
Definite-lived intangibles $ 14,100      
Amortization period (years) 12 years      
Total goodwill and intangible assets $ 110,783