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Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total.

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Face (par) amount of debt instrument at time of issuance.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date the debt instrument was issued, in CCYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Description of debt redemption features under terms of the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Weighted average interest rate of debt outstanding.

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No definition available.

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- Definition

Date the first payment under the line of credit must be paid, in CCYY-MM-DD format.

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- Definition

Description of the terms of a credit facility arrangement. Terms typically include interest rate, collateral required, guarantees required, repayment requirements, and restrictions on use of assets and activities of the entity.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Fair value of the amount outstanding under the credit facility.

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Amount of increase (decrease) of the credit facility.

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Date the credit facility first became available, in CCYY-MM-DD format.

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Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

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The effective interest rate during the reporting period.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of the required periodic payment applied to principal.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Bank Indebtedness and Long-Term Debt (Narrative) (Details) $ in Thousands, € in Millions	1 Months Ended			12 Months Ended
	Aug. 30, 2019 EUR (€)	Oct. 22, 2018 USD ($)	Sep. 19, 2017 USD ($)	Dec. 28, 2019 USD ($)	Dec. 30, 2017 EUR (€)	Aug. 29, 2019 EUR (€)	Oct. 20, 2016 USD ($)
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Initiation Date				Feb. 11, 2016
Line of Credit Facility, Maximum Borrowing Capacity				$ 350,000
Line of Credit Facility, Description				On February 11, 2016, the Company entered into a five-year credit agreement for a senior secured asset-based revolving credit facility with a syndicate of banks in the maximum aggregate principal amount of $350.0 million, subject to borrowing base capacity (the "Global Credit Facility"). The Global Credit Facility is used to support the working capital and general corporate needs of the Company's global operations, in addition to funding future strategic initiatives. The Global Credit Facility also includes borrowing capacity available for letters of credit and provides for borrowings on same-day notice, including in the form of swingline loans. On January 28, 2020, the Company entered into a restatement agreement, amending and restating the existing credit agreement to, among other things, extend the maturity date of the Global Credit Facility to March 31, 2022. Individual borrowings under the Global Credit Facility have terms of six months or less and bear interest based on various reference rates plus an applicable margin. The margin ranges from 0.25% to 0.75% with respect to base rate and prime rate borrowings and from 1.25% to 1.75% for eurocurrency rate and bankers' acceptance rate borrowings. In addition, under the restatement agreement, the margin is increased by an additional 0.50% while the Company's total leverage ratio exceeds a specific threshold.
Line of Credit Facility, Expiration Date				Mar. 31, 2022
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate During Period				0.25%
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate During Period				0.75%
Revolving Credit Facility [Member] \| Prime Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate During Period				1.25%
Revolving Credit Facility [Member] \| Prime Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate During Period				1.75%
US Subfacility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 20,000
Line of Credit Facility, Description				On September 19, 2017, the Company entered into an amendment to the Global Credit Facility to add a $15.0 million U.S. asset-based credit subfacility (the "U.S. Subfacility").
Line of Credit Facility, Increase (Decrease), Net			$ 15,000
Line of Credit Facility, Date of First Required Payment		Mar. 31, 2019
Line of Credit Facility, Periodic Payment, Principal			$ 3,330
Line of Credit Facility, Interest Rate Description				Borrowings under the U.S. Subfacility bear interest based on various reference rates plus a margin of 3.50%. The applicable margin for the U.S. Subfacility is set quarterly based on average borrowing availability for the preceding fiscal quarter ranges from 2.00% to 2.50% with respect to base rate and prime rate borrowings and from 3.00% to 3.50% for eurocurrency rate and bankers’ acceptance rate borrowings.
Debt Instrument, Interest Rate, Stated Percentage				3.50%
Drawdown credit facility				$ 10,000
US Subfacility [Member] \| Base Rate And Prime Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				2.00%
US Subfacility [Member] \| Base Rate And Prime Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				2.50%
US Subfacility [Member] \| Eurocurrency Rate And Bankers Acceptance Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				3.00%
US Subfacility [Member] \| Eurocurrency Rate And Bankers Acceptance Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				3.50%
Senior Secured Second Lien Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							9.50%
Debt Instrument, Description				On October 20, 2016, the Company's subsidiary, SunOpta Foods Inc. ("SunOpta Foods") issued $231.0 million of 9.5% Senior Secured Second Lien Notes due 2022 (the "Notes"). As at December 28, 2019, the outstanding principal amount of the Notes was $223.5 million, reflecting the redemption of $7.5 million principal amount by SunOpta Foods in October 2017. Debt issuance costs are recorded as a reduction against the principal amount of the Notes and are being amortized over the six-year term of the Notes.
Debt Instrument, Issuance Date				Oct. 20, 2016
Debt Instrument, Face Amount				$ 223,500			$ 231,000
Debt Instrument, Redemption, Amount				$ 7,500
Debt Instrument, Frequency of Periodic Payment				Interest on the Notes is payable semi-annually in arrears on April 15 and October 15 at a rate of 9.5% per annum.
Debt Instrument, Maturity Date				Oct. 09, 2022
Debt Instrument, Redemption, Description				At any time after October 9, 2019, SunOpta Foods may redeem the Notes, in whole or in part, at a redemption price equal to 104.750% from October 9, 2019 through October 8, 2020, 102.375% from October 9, 2020 through October 8, 2021 and at par thereafter, plus accrued and unpaid interest, if any, to but excluding the date of redemption. Certain additional redemption rights were applicable prior to October 9, 2019. In the event of a change of control, SunOpta Foods will be required to make an offer to repurchase the Notes at 101.000% of their principal amount, plus accrued and unpaid interest, if any, to the date of purchase.The Notes are secured by second-priority liens on substantially all of the assets that secure the credit facilities provided under the Global Credit Facility, subject to certain exceptions and permitted liens. The Notes are senior secured obligations and rank equally in right of payment with SunOpta Foods' existing and future senior debt and senior in right of payment to any future subordinated debt. The Notes are effectively subordinated to debt under the Global Credit Facility and any future indebtedness secured on a first priority basis. The Notes are initially guaranteed on a senior secured second-priority basis by the Company and each of its subsidiaries (other than SunOpta Foods) that guarantees indebtedness under the Global Credit Facility, subject to certain exceptions.The Notes are subject to covenants that, among other things, limit the Company's ability to (i) incur additional debt or issue preferred stock; (ii) pay dividends and make certain types of investments and other restricted payments; (iii) create liens; (iv) enter into transactions with affiliates; (v) sell assets; and (vi) create restrictions on the ability of restricted subsidiaries to pay dividends, make loans or advances or transfer assets to the Company, SunOpta Foods or any guarantor of the Notes. The foregoing covenants are subject to certain threshold amounts and exceptions as set forth in the indenture governing the Notes. In addition, the indenture provides for customary events of default (subject in certain cases to customary grace and cure periods), which include nonpayment, breach of covenants in the indenture, certain payment defaults or acceleration of other indebtedness, a failure to pay certain judgments and certain events of bankruptcy and insolvency. If an event of default occurs and is continuing, the trustee or holders of at least 25% in principal amount of the outstanding Notes may declare the principal of and accrued and unpaid interest on, if any, all the Notes to be due and payable.As at December 28, 2019, the estimated fair value of the outstanding Notes was approximately $230 million, based on quoted prices of the most recent over-the-counter transactions (level 2).
Debt Instrument, Interest Rate, Effective Percentage				10.40%
Line of Credit Facility, Fair Value of Amount Outstanding				$ 230,000
Senior Secured Second Lien Notes [Member] \| from October 9, 2019 through October 8, 2020
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage				104.75%
Senior Secured Second Lien Notes [Member] \| from October 9, 2020 through October 8, 2021
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage				102.375%
Global Credit Facility [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate				3.37%
Bulgarian Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity \| €	€ 6.0					€ 4.5
Line of Credit Facility, Interest Rate During Period	2.75%
Asset Backed Term Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Description					On December 28, 2017, TOC entered into a €3.0 million asset-backed term loan.
Debt Instrument, Issuance Date				Dec. 28, 2017
Debt Instrument, Face Amount \| €					€ 3.0
Debt Instrument, Frequency of Periodic Payment					Interest on this loan accrues at an effective rate of 3.06% and the loan matures on December 28, 2027. Principal and accrued interest is repayable in equal monthly installments.
Debt Instrument, Maturity Date					Dec. 28, 2027
Debt Instrument, Interest Rate, Effective Percentage					3.06%
Asset Backed Term Loans Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Description					On January 8, 2019, TOC entered into a second asset-backed term loan for €1.6 million
Debt Instrument, Issuance Date				Jan. 08, 2019
Debt Instrument, Face Amount \| €					€ 1.6
Debt Instrument, Frequency of Periodic Payment					accrues interest at an effective rate of 3.42% and matures on December 28, 2027. Principal and accrued interest on these loans are repayable in equal monthly installments
Debt Instrument, Interest Rate, Effective Percentage				3.06%	3.42%