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Loss Per Share (Tables)
9 Months Ended
Sep. 28, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Quarter ended Three quarters ended 
    September 28, 2019 September 29, 2018 September 28, 2019 September 29, 2018 
Basic Loss Per Share            
Numerator for basic loss per share            
 Earnings (loss) attributable to SunOpta Inc.$(11,749)$(4,606)$4,845 $(12,143)
 Less: dividends and accretion on Series A Preferred Stock (2,009) (1,981) (6,005) (5,922)
 Loss attributable to common shareholders$(13,758)$(6,587)$(1,160)$(18,065)
                
Denominator for basic loss per share            
 Basic weighted-average number of shares outstanding 87,928  87,168  87,695  86,982 
                
Basic loss per share$(0.16)$(0.08)$(0.01)$(0.21)
                
Diluted Loss Per Share            
Numerator for diluted loss per share            
 Earnings (loss) attributable to SunOpta Inc.$(11,749)$(4,606)$4,845 $(12,143)
 Less: dividends and accretion on Series A Preferred Stock(1) (2,009) (1,981) (6,005) (5,922)
 Loss attributable to common shareholders$(13,758)$(6,587)$(1,160)$(18,065)
                
Denominator for diluted loss per share            
 Basic weighted-average number of shares outstanding 87,928  87,168  87,695  86,982 
 Dilutive effect of the following:            
  Series A Preferred Stock(1)        
  Stock options and restricted stock units(2)        
 Diluted weighted-average number of shares outstanding 87,928  87,168  87,695  86,982 
                
Diluted loss per share$(0.16)$(0.08)$(0.01)$(0.21)