Annual report pursuant to Section 13 and 15(d)

GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details)

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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense on intangible assets $ 23,313 $ 20,821 $ 18,800
Future amortization expense [Abstract]      
Future amortization expense 2018 24,187    
Future amortization expense 2019 22,731    
Future amortization expense 2020 21,281    
Future amortization expense 2021 20,237    
Future amortization expense 2022 $ 19,161