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GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF ESTIMATED FUTURE AMORTIZATION EXPENSE (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 7,219  
2020 6,594  
2021 6,318  
2022 5,909  
2023 3,879  
Thereafter 3,028  
Net $ 32,947 $ 2,297