GOODWILL & INTANGIBLE ASSETS - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	$ 108,364	$ 116,956	$ 126,089
Product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	0	9	11,438
Cost of product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	34,039	40,286	44,326
Operating expense
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	$ 74,325	$ 76,661	$ 70,325