XML 18 R1.htm IDEA: XBRL DOCUMENT v3.7.0.1
Document and Entity Information - USD ($)
 12 Months Ended
Mar. 31, 2017
May 04, 2017
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Document and Entity Information          
Entity Registrant Name LOGITECH INTERNATIONAL SA        
Document Period End Date Mar. 31, 2017        
Entity Central Index Key 0001032975        
Document Type 10-K        
Amendment Flag false        
Current Fiscal Year End Date --03-31        
Entity Well-known Seasoned Issuer No        
Entity Voluntary Filers No        
Entity Current Reporting Status Yes        
Entity Filer Category Large Accelerated Filer        
Entity Common Stock, Shares Outstanding   163,570,990      
Document Fiscal Year Focus 2017        
Document Fiscal Period Focus FY        
Entity Public Float     $ 3,405,372,286 $ 4,000,000,000 $ 2,500,000,000