COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands				12 Months Ended
	Dec. 07, 2016	Sep. 01, 2016	Jul. 06, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Operating Leases, Future Minimum Payments Due [Abstract]
2018				$ 2,358
2019				1,813
2020				1,623
2021				1,373
2022				1,175
Thereafter				1,584
Total minimum future rental payments				9,926
Total rent expense for operating leases				2,800	$ 2,900	$ 3,400
Unconditional purchase obligations				$ 161,300
GN Netcom, Inc. vs. Plantronics, Inc.
Loss Contingencies [Line Items]
Punitive sanctions awarded against Plantronics, Inc.			$ 3,000
Accrued amounts			5,000
GN Netcom, Inc. vs. Plantronics, Inc. | Punitive Sanctions
Loss Contingencies [Line Items]
Accrued amounts			3,000
Payment of punitive damages	$ 1,900	$ 3,000
GN Netcom, Inc. vs. Plantronics, Inc. | Estimate of Fees and Costs Incurred
Loss Contingencies [Line Items]
Accrued amounts			$ 2,000