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Preferred Stock (Narrative) (Details) - USD ($) | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 22, 2021 | Jan. 01, 2022 | Jan. 02, 2021 | Dec. 28, 2019 | Apr. 24, 2020 | Oct. 07, 2016
Temporary Equity [Line Items] |  |  |  |  |  |
Dividends, Preferred Stock, Paid-in-kind |  | $ 0 | $ 3,881,000 | $ 0 |  |
Preferred stock accretion to redemption value |  | 720,000 | 1,692,000 | $ 1,222,000 |  |
Series A Preferred Stock [Member] | Oaktree Organics, L.P. and Oaktree Huntington Investment Fund II, L.P. |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Number of share issue for conversion preferred stock | 12,633,427 |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  |  | 85,000
Preferred Stock, Value, Issued | $ 87,500 |  |  |  |  | $ 85,000,000
Preferred stock, conversion price | $ 7.00 |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 8.00% |  |  |  |  |
Preferred Stock Issuance Costs | $ 300,000 |  |  |  |  | $ 6,000,000
Remaining unamortized issuance costs |  | 900,000 |  |  |  |
Payment of cash dividends | 1,000,000 | $ 1,800,000 |  |  |  |
Dividends, Preferred Stock, Paid-in-kind | 3,400,000 |  |  |  |  |
Conversion of Stock, Description |  | On February 22, 2021 (the "Exchange Date"), Oaktree exchanged all of their shares of Series A Preferred Stock for 12,633,427 shares of common stock of the Company ("Common Shares") at an exchange price of $7.00. Prior to the exchange, the Series A Preferred Stock provided for a cumulative dividend of 8.0% per year. On the Exchange Date, the Company paid cash dividends of $1.0 million on the Series A Preferred Stock for the period January 1, 2021 to February 22, 2021. In addition, in the first quarter of 2021, the Company paid cash dividends of $1.8 million on Series A Preferred Stock related to the fourth quarter of 2020. Subsequent to the Exchange Date, the Company is no longer required to pay dividends on the Series A Preferred Stock. |  |  |  |
Preferred Stock, Liquidation Preference, Value | $ 85,000,000 |  |  |  |  |
Stock Redeemed or Called During Period, Shares | 12,633,427 |  |  |  |  |
Series B-1 Preferred Stock [Member] | Stock issued to each recipient [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  | 15,000 |
Series B-1 Preferred Stock [Member] | Oaktree and Engaged [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  | 30,000 |
Preferred Stock, Value, Issued |  |  |  |  | $ 30,000,000 |
Preferred Stock Issuance Costs |  |  |  |  | $ 3,200,000 |
Payment of cash dividends |  | $ 600,000 |  |  |  |
Dividends, Preferred Stock, Paid-in-kind |  | $ 400,000 |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  | $ 1,015 |  |  | $ 1,000 |
Preferred Stock, Liquidation Preference, Value |  | $ 30,400,000 |  |  |  |
Preferred Stock, Dividend Payment Terms |  | Cumulative preferred dividends accrue daily on the Series B-1 Preferred Stock at an annualized rate of 8.0% of the Series B-1 Liquidation Preference prior to September 30, 2029, and 10.0% of the liquidation preference thereafter (subject to an increase of 1.0% per quarter, up to a maximum rate of 5.0% per quarter on the occurrence of certain events of non-compliance). |  |  |  |
Accrued Unpaid Dividends |  | $ 600,000 |  |  |  |
Preferred stock accretion to redemption value |  | $ 500,000 | $ 300,000 |  |  |
Preferred Stock, Convertible, Terms |  | At any time, the Series B-1 Preferred Stock may be exchanged, 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 Series B Liquidation Preference divided by $2.50 (such price, the "Series B-1 Exchange Price" and such quotient, the "Series B-1 Exchange Rate"). |  |  |  |
Convertible Preferred Stock, Settlement Terms |  | SunOpta Foods may cause the holders of the Series B-1 Preferred Stock to exchange all of their shares of Series B-1 Preferred Stock into a number of Common Shares equal to the number of shares of Series B-1 Preferred Stock outstanding multiplied by the Series B-1 Exchange Rate if (i) fewer than 10% of the shares of Series B-1 Preferred Stock issued on April 24, 2020 remain outstanding, or (ii) on or after April 24, 2023, the average volume-weighted average price of the Common Shares during the then preceding 20 trading day period is greater than 200% of the Series B-1 Exchange Price then in effect. |  |  |  |
Maximum holder beneficial ownership |  | 19.99% |  |  |  |
Preferred stock, convertible shares issuable |  | 12,178,667 |  |  |  |
Preferred stock exchange, description of exchange price |  | The Series B-1 Exchange Price is subject to certain anti-dilution adjustments, including a weighted-average adjustment for issuances of Common Shares below the Series B-1 Exchange Price, provided that the Series B-1 Exchange Price may not be lower than $2.00 (subject to adjustment in certain circumstances). |  |  |  |
Series B Preferred Stock [Member] | Oaktree and Engaged [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Preferred Stock, Convertible, Terms |  | Oaktree and Engaged are entitled to vote the Series B-1 Preferred Stock with the Common Shares on an as-exchanged basis, subject to a permanent 19.99% voting cap. As a result of the voting cap, each of Oaktree and Engaged will only be able to vote its Series B-1 Preferred Stock to the extent that, when taken together with any other voting securities each investor controls, such votes do not exceed 19.99% of the votes eligible to be cast by all security holders of the Company. On April 24, 2020, the Company designated Special Shares, Series 2 to serve as the mechanism for attaching exchanged voting rights to the Series B-1 Preferred Stock. The Special Shares, Series 2 entitle the holder thereof to one vote per Special Share, Series 2 on all matters submitted to a vote of the holders of Common Shares, voting together as a single class, subject to certain exceptions. The Special Shares, Series 2 are not transferrable and the voting rights associated with the Special Shares, Series 2 will terminate upon the transfer of the shares of Series B-1 Preferred Stock to a third party, other than an affiliate of Oaktree or Engaged, as applicable. As at January 1, 2022, 6,089,333 Special Shares, Series 2 were issued to Engaged, equal to the number of Common Shares issuable to Engaged on the exchange of all of the shares of Series B-1 Preferred Stock held by it, and no Special Shares, Series 2 were issued to Oaktree, as Oaktree was subject to the Series B-1 Exchange Cap. |  |  |  |
Special Voting Shares, issued and outstanding |  | 6,089,333 |  |  |  |

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