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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract]                
Restructuring charges $ 3,488 $ 1,224 $ 3,005 $ 4,148        
Acquisition costs     2,321     $ 2,960 $ 0  
Gain (loss) from debt extinguishment   $ (969) $ (5,245)     (7,925) 0 $ 0
Acquisition contingent consideration (1,403)       $ 1,333 $ 1,733 $ 1,646 $ 0
Tax benefit for acquisition cost 15              
Tax expense (benefit) from debt extinguishment $ (24)