Discontinued Operations (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 12, 2023	Dec. 30, 2023	Dec. 31, 2022	Jan. 01, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repayment of portion of outstanding borrowings		$ 95,303	$ 20,085	$ 8,502
Divestiture of Frozen Fruit [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on divestiture		(119,821)	(31,468)	0
Impairment charges for inventory		12,900
Impairment charge related to the equipment and operating lease right-of-use assets		10,000
Gain on sale of frozen fruit processing facility			3,800
Income tax benefit		167	16,154	$ 1,574
Divestiture of Frozen Fruit [Member] | Asset Purchase Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration	$ 95,300
Short-term note receivable	10,500	6,300
Receivable amount in five consecutive monthly installments	2,100
Accounts payable and accrued liabilities assumed	15,700
Repayments of certain bank loans and other liabilities	20,500
Repayment of portion of outstanding borrowings	$ 74,800
Interest rate per annum	The Seller Promissory Notes bear interest at a rate per annum equal to the Secured Overnight Financing Rate ("SOFR"), determined quarterly in advance, plus a margin of 4.00% for the first year and 7.00% for the second and third years. Interest is payable quarterly in-kind. The Seller Promissory Notes mature on October 12, 2026, and outstanding principal and accrued and unpaid interest is payable on the maturity date.
Unrealized loss (gain) on derivative instrument	$ 400
Maximum deduction from principal amount of Seller Promissory Notes		5,000
Net Receivable from Purchasers		$ 500
Sunrise Growers [Member] | Asset Purchase Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Principal amount of seller promissory notes	5,000
Sunopta Mexico [Member] | Asset Purchase Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Principal amount of seller promissory notes	$ 15,000
Sale of Sunflower Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on divestiture			(23,200)
Tradin Organic [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on divestiture			(8,200)
Income tax benefit			$ 12,900