COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	1 Months Ended
	Nov. 30, 2017	Jul. 31, 2016	Jun. 30, 2019	Mar. 31, 2019
Loss Contingencies [Line Items]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year			$ 19,147
Lessee, Operating Lease, Liability, Payments, Due Year Two			21,984
Lessee, Operating Lease, Liability, Payments, Due Year Three			19,084
Lessee, Operating Lease, Liability, Payments, Due Year Four			6,390
Lessee, Operating Lease, Liability, Payments, Due Year Five			1,547
Lessee, Operating Lease, Liability, Payments, Due after Year Five			619
Lessee, Operating Lease, Liability, Payments, Due			68,771
Lessee, Operating Lease, Liability, Undiscounted Excess Amount			(5,061)
Operating lease, liability			$ 63,710	$ 68,500
Operating Lease, Weighted Average Remaining Lease Term			3 years 1 month 6 days
Operating Lease, Weighted Average Discount Rate, Percent			4.90%
Unconditional purchase obligations			$ 406,400
GN Netcom, Inc. vs. Plantronics, Inc. [Member] | Punitive Sanctions [Member]
Loss Contingencies [Line Items]
Sanctions order issued for allegations of spoliation of evidence		$ 4,900
Amount awarded from other party	$ 200