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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Jul. 31, 2016
Operating Leases, Future Minimum Payments Due [Abstract]
2019		$ 2,556
2020		2,142
2021		1,823
2022		1,322
2023		823
Thereafter		1,304
Total minimum future rental payments		9,970
Total rent expense for operating leases		2,600	$ 2,800	$ 2,900
Unconditional purchase obligations		190,000
GN Netcom, Inc. vs. Plantronics, Inc.
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party		$ 200
GN Netcom, Inc. vs. Plantronics, Inc. \| Punitive Sanctions
Loss Contingencies [Line Items]
Accrued amounts					$ 4,900
Forecast \| Polycom
Loss Contingencies [Line Items]
Payments to Acquire Businesses, Gross	$ 2,000,000