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GOODWILL AND INTANGIBLE ASSETS - Amortization (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization $ 1.4 $ 1.4 $ 4.2 $ 3.9
Expected annual amortization in next fiscal year 5.8   5.8  
Expected annual amortization in year two 5.8   5.8  
Expected annual amortization in year three 5.8   5.8  
Expected annual amortization in year four $ 5.1   $ 5.1