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REVENUE RECOGNITION - Narrative (Details) - USD ($)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]      
Contract with customer, liability, revenue recognized $ 6,100,000    
Capitalized contract cost, amortization 27,800,000 $ 19,500,000 $ 14,200,000
Capitalized contract cost, impairment loss $ 0 $ 0 $ 0