XML 14 R1.htm IDEA: XBRL DOCUMENT v3.8.0.1
Document and Entity Information - USD ($)
 12 Months Ended
Mar. 31, 2018
May 04, 2018
Sep. 29, 2017
Document and Entity Information      
Entity Registrant Name LOGITECH INTERNATIONAL SA    
Document Period End Date Mar. 31, 2018    
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   165,449,160  
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Entity Public Float     $ 5,609,748,434