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DOCUMENT AND ENTITY INFORMATION (USD $)
3 Months Ended
Jun. 30, 2011
Jul. 30, 2011
Oct. 02, 2010
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 Jul. 02, 2011
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus Q1    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   46,698,969  
Entity Public Float     $ 1,602,180,651