COVER PAGE - shares	9 Months Ended
	Dec. 31, 2019	Jan. 29, 2020
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 28, 2019
Document Transition Report	false
Entity File Number	001-12696
Entity Registrant Name	PLANTRONICS INC /CA/
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0207692
Entity Address, Address Line One	345 Encinal Street
Entity Address, City or Town	Santa Cruz
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95060
City Area Code	831
Local Phone Number	426-5858
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	PLT
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		39,927,953
Entity Shell Company	false
Entity Central Index Key	0000914025
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false