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REVENUE RECOGNITION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Contract with customer, revenue recognized $ 1.3   $ 5.0  
Amortization cost $ 6.7 $ 4.5 $ 12.8 $ 8.7
Minimum        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Subscription term     1 year  
Maximum        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Subscription term     5 years