GOODWILL AND INTANGIBLE ASSETS - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 28,205	$ 31,176
Product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	2	2,877
Cost of product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	9,814	10,672
Operating expense
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 18,389	$ 17,627