DOCUMENT AND ENTITY INFORMATION (USD $)	9 Months Ended
	Dec. 31, 2011	Jan. 28, 2012	Oct. 01, 2011
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-Q
Document Period End Date	Dec. 31, 2011
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		42,979,338
Entity Public Float			$ 1,240,169,114