Document and Entity Information (USD $)	12 Months Ended
	Mar. 31, 2011	May 02, 2011	Oct. 01, 2010
Document and Entity Information
Document Type	10-K
Amendment Flag	false
Document Period End Date	Mar. 31, 2011
Entity Registrant Name	LOGITECH INTERNATIONAL SA
Entity Central Index Key	0001032975
Current Fiscal Year End Date	--03-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 2,559,253,732
Entity Common Stock, Shares Outstanding		179,191,688
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY