ACQUISITIONS - Efflux (Details) - USD ($) $ in Thousands		9 Months Ended
	Jul. 12, 2017	Dec. 31, 2017	Mar. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 1,716,371	$ 1,718,162
Weighted average useful life of acquired intangible assets		14 years 7 months
Efflux
Business Acquisition [Line Items]
Initial cash payment	$ 8,104
Estimated fair value of contingent purchase consideration	523
Estimated purchase price	8,627
Cash	93
Accounts receivable	3
Prepaid and other current assets	208
Property, plant and equipment	8
Intangible assets	2,590
Deferred tax asset	841
Accounts payable	(7)
Accrued other liabilities	(200)
Deferred revenue	(8)
Deferred tax liabilities	(978)
Goodwill	6,077
Fair value of acquired identifiable intangible assets	$ 2,590
Weighted average useful life of acquired intangible assets	10 years
Efflux | Developed technology
Business Acquisition [Line Items]
Fair value of acquired identifiable intangible assets	$ 1,980
Weighted average useful life of acquired intangible assets	10 years
Efflux | Customer relationships
Business Acquisition [Line Items]
Fair value of acquired identifiable intangible assets	$ 610
Weighted average useful life of acquired intangible assets	10 years