Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Feb. 24, 2023	Jul. 02, 2022
Entity Registrant Name	SUNOPTA INC.
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	false
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2022
Amendment Flag	false
Document Period End Date	Dec. 31, 2022
Document Type	10-K
Entity Common Stock, Shares Outstanding		107,948,348
Entity Public Float			$ 650
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Filer Category	Large Accelerated Filer
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000351834
Entity File Number	001-34198
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
City Area Code	952
Local Phone Number	820-2518
Entity Interactive Data Current	Yes
Entity Tax Identification Number	00-0000000
Entity Incorporation, State or Country Code	Z4
Document Transition Report	false
Document Annual Report	true
ICFR Auditor Attestation Flag	true
Auditor Name	Ernst & Young LLP
Auditor Location	Minneapolis
Auditor Firm ID	42
The Nasdaq Stock Market | Common Shares
Trading Symbol	STKL
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common Shares
The Toronto Stock Exchange | Common Shares
Trading Symbol	SOY
Title of 12(b) Security	Common Shares