DOCUMENT AND ENTITY INFORMATION - USD ($)	12 Months Ended
	Mar. 31, 2018	May 07, 2018	Sep. 29, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	PLANTRONICS INC /CA/
Entity Central Index Key	0000914025
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K/A
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	true
Entity Common Stock, Shares Outstanding		33,261,047
Amendment Description	This Amendment is being filed solely to correct an administrative error on the cover page of the Original Report with respect to the number of shares outstanding of the Company’s common stock as of May 7, 2018. The correct number of shares of the Company’s common stock outstanding as of May 7, 2018 was 33,261,047.
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 1,459,034,920