COVER PAGE - shares	3 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Cover page.
Document Type	10-Q/A
Document Quarterly Report	true
Document Period End Date	Jun. 29, 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		39,575,910
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	Q1
Amendment Flag	true
Amendment Description	This Amendment No. 1 on Form 10-Q/A (the “Amendment”) of Plantronics, Inc. (the “Company”) amends the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2019, originally filed with the Securities and Exchange Commission on August 6, 2019 (the “Original Report”). The Original Report inadvertently excluded certain XBRL information in portions of the financial statements and accompanying notes to the condensed consolidated financial statements. This Amendment No. 1 includes the XBRL information and does not reflect events that may have occurred subsequent to the original filing date, and does not modify or update in any way disclosures made in the Original Report. No other changes have been made to the Original Report. As required by Rule 12b-15 of the Securities Exchange Act of 1934, as amended, this Amendment contains new certifications by the Company’s principal executive officer and principal financial officer, which are being filed as exhibits to the Amendment.