ACQUISITIONS - Summary of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jul. 12, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Estimated fair value of assets acquired and liabilities assumed:
Goodwill		$ 1,712,764	$ 1,718,162	$ 1,709,369
Efflux Systems, Inc.
Business Acquisition [Line Items]
Initial cash payment	$ 8,104
Estimated fair value of contingent purchase consideration	523
Estimated purchase price	8,627
Estimated fair value of assets acquired and liabilities assumed:
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