| Cover | Jan. 31, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jan. 31, 2022 |
| Entity Registrant Name | Fabrinet |
| Entity Incorporation, State or Country Code | E9 |
| Entity File Number | 001-34775 |
| Entity Tax Identification Number | 98-1228572 |
| Entity Address, Address Line One | c/o Intertrust Corporate Services |
| Entity Address, City or Town | One Nexus Way, Camana Bay |
| Entity Address, Region | Grand Cayman |
| Entity Address, Postal Zip Code | KY1-9005 |
| Entity Address, Country | KY |
| City Area Code | 66 2 |
| Local Phone Number | 524-9600 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Ordinary Shares, $0.01 par value |
| Trading Symbol | FN |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001408710 |
