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LEGAL AND OTHER PROCEEDINGS (Details) - USD ($)
3 Months Ended
Feb. 27, 2018
Mar. 31, 2021
Sep. 30, 2018
Mar. 31, 2017
Loss Contingencies [Line Items]        
Additions to other significant pending legal or other proceedings   $ 0    
Universitas Education, LLC | Settled Litigation        
Loss Contingencies [Line Items]        
Loss related to litigation settlement $ 12,000,000.0      
Proceeds from arbitration settlement and legal costs     $ 7,900,000  
NHT | Pending Litigation        
Loss Contingencies [Line Items]        
Face amount       $ 6,300,000