COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	1 Months Ended
	Nov. 30, 2017	Jul. 31, 2016	Sep. 30, 2019	Apr. 01, 2019
Loss Contingencies [Line Items]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year			$ 13,283
Lessee, Operating Lease, Liability, Payments, Due Year Two			23,690
Lessee, Operating Lease, Liability, Payments, Due Year Three			20,051
Lessee, Operating Lease, Liability, Payments, Due Year Four			6,878
Lessee, Operating Lease, Liability, Payments, Due Year Five			1,873
Lessee, Operating Lease, Liability, Payments, Due after Year Five			606
Lessee, Operating Lease, Liability, Payments, Due			66,381
Lessee, Operating Lease, Liability, Undiscounted Excess Amount			(5,784)
Operating lease, liability			$ 60,597	$ 68,500
Operating Lease, Weighted Average Remaining Lease Term			2 years 10 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent			4.80%
Unconditional purchase obligations			$ 341,500
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