ACQUISITIONS - Summary of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Aug. 19, 2016	Oct. 07, 2015	Jul. 14, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Business Acquisition [Line Items]
Estimated fair value of contingent purchase consideration				$ 5,449	$ 7,293
Estimated fair value of assets acquired and liabilities assumed:
Goodwill				$ 1,718,162	$ 1,709,369	$ 197,445
Avvasi
Business Acquisition [Line Items]
Initial cash payment	$ 3,946
Estimated fair value of contingent purchase consideration	660
Estimated purchase price	4,606
Estimated fair value of assets acquired and liabilities assumed:
Accounts receivable	103
Inventories	85
Prepaid expenses and other assets	32
Property, plant and equipment	43
Intangible assets	2,760
Accounts payable	(1)
Accrued compensation	(49)
Deferred revenue	(317)
Goodwill	$ 1,950
Communications Business
Business Acquisition [Line Items]
Total equity consideration		$ 5,700	$ 2,299,911
Estimated purchase price		5,700	2,270,556
Estimated fair value of assets acquired and liabilities assumed:
Cash			27,701
Accounts receivable		110	140,586
Inventories		78	80,719
Prepaid expenses and other assets		35	6,519
Property, plant and equipment		1,254	36,825
Deferred income taxes			13,803
Intangible assets			1,080,700
Other assets		281	999
Accounts payable		(8)	(21,311)
Accrued compensation		(824)	(24,316)
Accrued other		(176)	(12,916)
Deferred revenue		(65)	(187,882)
Other long-term liabilities		(126)	(3,615)
Accrued retirement benefits			(29,917)
Deferred tax liabilities			(348,004)
Goodwill		$ 5,141	1,510,665
Communications Business | Replacement Awards
Business Acquisition [Line Items]
Total equity consideration			$ 29,355