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Sale of Soy and Corn Business (Narrative) (Details) - Sunopta Grains And Foods Inc [Member] - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 22, 2019
Sep. 28, 2018
Sep. 29, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of business $ 66.5    
Revenue 10.3 $ 27.0 $ 77.9
Earnings (loss) before income taxes $ (0.2) $ 0.8 $ 5.5