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RESTRUCTURING CHARGES - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2018
Employee
Mar. 31, 2020
USD ($)
plan
Restructuring Cost and Reserve [Line Items]          
Restructuring charges $ 93   $ 123    
Restructuring plans | plan         2
Restructuring costs addition $ 100        
VSP          
Restructuring Cost and Reserve [Line Items]          
Number of employees terminated | Employee       155  
VSP | Employee-Related          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges     $ 100    
Q2FY20 Plan | Employee-Related          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges   $ 500      
Q4FY20 Plan | Employee-Related          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges         $ 2,100