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COMMITMENTS AND CONTINGENT LIABILITIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Aug. 31, 2009
Commitments and Contingencies Disclosure [Abstract]        
Operating leases, rent expense, net $ 37,068 $ 35,726 $ 26,297  
Aggregate future minimum lease payments for operating leases in 2018 35,176      
Aggregate future minimum lease payments for operating leases in 2019 30,730      
Aggregate future minimum lease payments for operating leases in 2020 26,119      
Aggregate future minimum lease payments for operating leases in 2021 20,008      
Aggregate future minimum lease payments for operating leases in 2022 14,198      
Aggregate future minimum lease payments for operating leases thereafter 78,105      
Purchase obligation, purchases during period 226,026 $ 209,924 $ 213,674  
Purchase obligation, due in next twelve months 239,365      
Purchase obligation due in second year 2,045      
Purchase obligation due in third year 42      
Purchase obligation due in fourth year 15      
Purchase obligation due in fifth year $ 0      
Net capital cost value in proposed remedial action plan       $ 10,000