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Earnings Per Share (Table) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Earnings (loss) attributable to SunOpta Inc. $ (4,606) $ (6,027) $ (12,143) $ (17,833)
Dividends and accretion on Series A Preferred Stock (1,981) (1,954) (5,922) (5,848)
Earnings (loss) available to common shareholders $ (6,587) $ (7,981) $ (18,065) $ (23,681)
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Weighted Average Number of Shares Outstanding, Basic 87,168,000 86,541,000 86,982,000 86,232,000
Dilutive Securities, Effect on Basic Earnings Per Share, Including Options and Restrictive Stock Units 0 0 0 0
Weighted Average Number of Shares Outstanding, Diluted 87,168,000 86,541,000 86,982,000 86,232,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,864,830 1,518,129 1,986,406 2,488,826
Earnings (loss) per share - basic        
Basic $ (0.08) $ (0.09) $ (0.21) $ (0.27)
Earnings (loss) per share - diluted        
Diluted $ (0.08) $ (0.09) $ (0.21) $ (0.27)
Options Held [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Dilutive Securities, Effect on Basic Earnings Per Share, Including Options and Restrictive Stock Units 0 0 0 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 625,167 917,702 575,776 850,013
Series A Preferred Stock [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Dilutive Securities, Effect on Basic Earnings Per Share, Including Options and Restrictive Stock Units 0 0 0 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 11,333,333 11,333,333 11,333,333 11,333,333