COMMITMENTS AND CONTINGENCIES (Details) - USD ($)		1 Months Ended
	Dec. 10, 2018	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				$ 19,147,000
Lessee, Operating Lease, Liability, Payments, Due Year Two				21,984,000
Lessee, Operating Lease, Liability, Payments, Due Year Three				19,084,000
Lessee, Operating Lease, Liability, Payments, Due Year Four				6,390,000
Lessee, Operating Lease, Liability, Payments, Due Year Five				1,547,000
Lessee, Operating Lease, Liability, Payments, Due after Year Five				619,000
Lessee, Operating Lease, Liability, Payments, Due				68,771,000
Lessee, Operating Lease, Liability, Undiscounted Excess Amount				(5,061,000)
Operating lease, liability				$ 63,710,000	$ 68,500,000
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				$ 406,400,000
Litigation Settlement, Amount Awarded to Other Party	$ 374,475
GN Netcom, Inc. vs. Plantronics, Inc. [Member] | Punitive Sanctions [Member]
Loss Contingencies [Line Items]
Sanctions order issued for allegations of spoliation of evidence			$ 4,900,000
Amount awarded from other party		$ 200,000