GOODWILL & INTANGIBLE ASSETS - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	$ 91,189	$ 108,364	$ 116,956
Product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	0	0	9
Cost of product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	26,664	34,039	40,286
Operating expense
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	$ 64,525	$ 74,325	$ 76,661