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COVER PAGE - USD ($)
 12 Months Ended
Mar. 31, 2020
May 18, 2020
Sep. 27, 2019
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2020    
Document Transition Report false    
Entity File Number 0-29174    
Entity Registrant Name LOGITECH INTERNATIONAL S.A.    
Entity Incorporation, State or Country Code V8    
Entity Address, Address Line One 1015 Lausanne    
Entity Address, Country CH    
Entity Address, Address Line Two c/o Logitech Inc.    
Entity Address, Address Line Three 7700 Gateway Boulevard    
Entity Address, City or Town Newark    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94560    
City Area Code 510    
Local Phone Number 795-8500    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 6,703,496,937
Entity Common Stock, Shares Outstanding   167,817,568  
Documents Incorporated by Reference Portions of the registrant's Proxy Statement for the 2020 Annual Meeting of Shareholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant's fiscal year ended March 31, 2020.    
Entity Central Index Key 0001032975    
Amendment Flag false    
Current Fiscal Year End Date --03-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY