Series B1 Preferred Stock (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	2 Months Ended	3 Months Ended
	Mar. 03, 2023	Apr. 24, 2020	Mar. 03, 2023	Apr. 01, 2023	Apr. 02, 2022	Jul. 02, 2020
Temporary Equity [Line Items]
Dividends paid				$ 818	$ 609
Series B-1 Preferred Stock [Member]
Temporary Equity [Line Items]
Preferred Stock, Shares Issued		30,000
Preferred Stock, Value, Issued		$ 30,000
Unamortized issuance costs				200	$ 100
Series B-1 Preferred Stock [Member] | Oaktree and Engaged [Member]
Temporary Equity [Line Items]
Preferred Stock, Shares Issued		15,000
Preferred Stock, Dividend Payment Terms		Preferred dividends accrue daily on the Series B-1 preferred stock at an annualized rate of 8.0% of the liquidation preference prior to September 30, 2029, and 10.0% of the liquidation preference thereafter.
Preferred Stock, Liquidation Preference, Value						$ 30,400
Preferred Stock, Liquidation Preference Per Share						$ 1,015
Dividends paid				$ 600
Series B-1 Preferred Stock [Member] | Engaged [Member]
Temporary Equity [Line Items]
Number of shares issued for conversion preferred stock	6,089,331
Preferred stock, conversion price	$ 2.5		$ 2.5
Shares exchanged as a percentage of shares issued and outstanding	5.30%
Preferred stock value derecognized	$ 14,100
Unamortized issuance costs	1,100
Preferred stock issuance costs	$ 100		$ 100
Dividends paid			$ 200
Series B-1 Preferred Stock [Member] | Oaktree [Member]
Temporary Equity [Line Items]
Preferred Stock, Shares Issued				15,000
Preferred Stock, Convertible, Terms				At any time, Oaktree may exchange the Series B-1 Preferred Stock, in whole or in part, into the number of Common Shares equal to, per share of Series B-1 Preferred Stock, the quotient of the liquidation preference divided by the exchange price of $2.50. On or after April 24, 2023, SunOpta Foods may cause Oaktree to exchange all of their shares of Series B-1 Preferred Stock if the volume-weighted average price of the Common Shares during the then preceding 20 trading day period is greater than 200% of the exchange price then in effect.
Preferred Stock, Redemption Terms				In addition, at any time on or after April 24, 2025, SunOpta Foods may redeem all of the Series B-1 Preferred Stock for an amount per share equal to the value of the liquidation preference at such time, plus accrued and unpaid dividends.
Accrued unpaid dividends				$ 300