| Document and Entity Information Document | Dec. 08, 2023 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Creation Date | Dec. 08, 2023 |
| Document Period End Date | Dec. 08, 2023 |
| Amendment Flag | false |
| Entity Registrant Name | SunOpta Inc. |
| Entity Address, Address Line One | 7078 Shady Oak Road |
| Entity Address, City or Town | Eden Prairie |
| Entity Address, State or Province | MN |
| Entity Address, Postal Zip Code | 55344 |
| Entity Incorporation, State Country Name | Z4 |
| City Area Code | 952 |
| Local Phone Number | 820-2518 |
| Entity File Number | 001-34198 |
| Entity Central Index Key | 0000351834 |
| Entity Emerging Growth Company | false |
| Entity Tax Identification Number | 00-0000000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| NASDAQ [Member] | Common Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Common Shares |
| Trading Symbol | STKL |
| Security Exchange Name | NASDAQ |
| Toronto Stock Exchange [Member] | Common Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Common Shares |
| Trading Symbol | SOY |
