GOODWILL AND INTANGIBLE ASSETS - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	$ 116,956	$ 126,089	$ 84,421
Product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	9	11,438	6,747
Cost of product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	40,286	44,326	45,127
Operating expense
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	$ 76,661	$ 70,325	$ 32,547