GOODWILL AND INTANGIBLE ASSETS - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 31,262	$ 26,724	$ 62,438	$ 28,329
Product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	2,869	2,028	5,746	2,028
Cost of product revenue
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	10,757	14,807	21,429	15,565
Operating expense
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 17,636	$ 9,889	$ 35,263	$ 10,736