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COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]      
Purchase obligation, purchases during period $ 235,148 $ 142,044 $ 143,523
Purchase obligation, due in next twelve months 255,661    
Purchase obligation due in second year 38,581    
Purchase obligation due in third year 0    
Purchase obligation due in fourth year 0    
Purchase obligation due in fifth year $ 0