| COVER PAGE COVER PAGE | Sep. 26, 2019 |
| Cover page. | |
| Document Type | 8-K |
| Document Period End Date | Sep. 26, 2019 |
| Entity Registrant Name | LOGITECH INTERNATIONAL SA |
| Entity File Number | 0-29174 |
| Entity Incorporation, State or Country Code | V8 |
| Entity Address, Address Line One | Apples |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Title of 12(b) Security | Registered Shares |
| Trading Symbol | LOGI |
| Security Exchange Name | NASDAQ |
| Entity Central Index Key | 0001032975 |
| Amendment Flag | false |
