v3.24.0.1
Series B-1 Preferred Stock (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 03, 2023
Apr. 24, 2020
Mar. 31, 2023
Dec. 30, 2023
Dec. 31, 2022
Jan. 01, 2022
May 19, 2023
Jul. 02, 2020
Series B-1 Preferred Stock [Member]                
Temporary Equity [Line Items]                
Preferred Stock, Shares Issued   30,000            
Preferred Stock, Value, Issued   $ 30.0            
Unamortized issuance costs       $ 0.6 $ 0.7 $ 0.5    
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               $ 30.4
Preferred Stock, Liquidation Preference Per Share               $ 1,015
Dividends paid     $ 0.6          
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              
Shares exchanged as a percentage of shares issued and outstanding 5.30%              
Preferred stock value derecognized $ 14.1              
Unamortized issuance costs 1.1              
Preferred stock issuance costs $ 0.2              
Redemption price per share $ 0.00001              
Dividends paid     $ 0.2          
Series B-1 Preferred Stock [Member] | Oaktree [Member]                
Temporary Equity [Line Items]                
Preferred Stock, Shares Issued       15,000        
Preferred Stock, Dividend Payment Terms       In the first quarter of 2023, the Company paid cash dividends on the Series B-1 Preferred Stock of $0.6 million in the aggregate to Oaktree and Engaged related to the fourth quarter of 2022, together with a cash dividend $0.2 million paid to Engaged for the period from January 1, 2023 to March 3, 2023. In each of the second through fourth quarters of 2023, the Company paid a quarterly cash dividend of $0.3 million to Oaktree on the Series B-1 Preferred Stock, and, as at December 30, 2023, the Company accrued unpaid dividends to Oaktree of $0.3 million for the fourth quarter of 2023, which are recorded in accounts payable and accrued liabilities on the consolidated balance sheet.        
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, while, at any time, 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.        
Dividends paid       $ 0.3        
Accrued unpaid dividends       $ 0.3        
Special Shares, Series 2 [Member] | Oaktree [Member]                
Temporary Equity [Line Items]                
Preferred Stock, Shares Issued             2,932,453  
Limit of voting rights             19.99%