GOODWILL AND INTANGIBLE ASSETS - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	$ 126,089	$ 84,421	$ 7,142
Product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	11,438	6,747	0
Cost of product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	44,326	45,127	3,639
Operating expense
Finite-Lived Intangible Assets [Line Items]
Amortization expenses	$ 70,325	$ 32,547	$ 3,503