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GOODWILL AND INTANGIBLE ASSETS - Future Amortization Expense (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2017 $ 5.0  
Future amortization expense, fiscal year 2018 15.9  
Future amortization expense, fiscal year 2019 11.2  
Future amortization expense, fiscal year 2020 9.8  
Future amortization expense, fiscal year 2021 7.7  
Thereafter 15.8  
Net Carrying Amount $ 65.4 $ 75.3