XML 16 R1.htm IDEA: XBRL DOCUMENT v3.19.1
Document and Entity Information - USD ($)
 12 Months Ended
Mar. 31, 2019
May 03, 2019
Sep. 28, 2018
Document and Entity Information      
Entity Registrant Name LOGITECH INTERNATIONAL SA    
Document Period End Date Mar. 31, 2019    
Entity Central Index Key 0001032975    
Document Type 10-K    
Amendment Flag false    
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 Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   166,598,546  
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Public Float     $ 7,359,961,924