REVENUE RECOGNITION - Contract Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 50,404	$ 37,811
Contract assets, current, net (included in Other current assets)	12,002	10,425
Contract assets, non-current, net (included in Other assets)	15,688	13,698
Deferred revenue, current	18,015	7,105
Deferred revenue, non-current (included in Other liabilities, non-current)	$ 2,768	$ 1,119