GOODWILL AND INTANGIBLE ASSETS - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 32,171	$ 28,413	$ 94,609	$ 56,742
Product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	2,850	2,357	8,596	4,385
Cost of product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	11,773	14,765	33,202	30,330
Operating expense
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 17,548	$ 11,291	$ 52,811	$ 22,027