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Loss Per Share (Basic and diluted loss per share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Numerator for basic loss per share
Loss attributable to SunOpta Inc.	$ (758)	$ (109,205)	$ (135,320)
Less: dividends and accretion on Series A Preferred Stock	(8,022)	(7,909)	(7,809)
Loss attributable to common shareholders	$ (8,780)	$ (117,114)	$ (143,129)
Denominator for basic loss per share
Basic weighted-average number of shares outstanding	87,787	87,082	86,355
Basic loss per share	$ (0.10)	$ (1.34)	$ (1.66)
Numerator for diluted loss per share
Loss attributable to SunOpta Inc.	$ (758)	$ (109,205)	$ (135,320)
Less: dividends and accretion on Series A Preferred Stock	(8,022)	(7,909)	(7,809)
Loss attributable to common shareholders	$ (8,780)	$ (117,114)	$ (143,129)
Denominator for diluted loss per share
Basic weighted-average number of shares outstanding	87,787	87,082	86,355
Dilutive effect of the following:
Diluted weighted-average number of shares outstanding	87,787	87,082	86,355
Diluted loss per share	$ (0.10)	$ (1.34)	$ (1.66)
Series A Preferred Stock [Member]
Dilutive effect of the following:
Dilutive Securities, Effect on Basic Earnings Per Share	0	0	0
Stock Options And Restricted Stock Units [Member]
Dilutive effect of the following:
Dilutive Securities, Effect on Basic Earnings Per Share	0	0	0

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The amount of preferred stock dividends that is an adjustment to diluted net income apportioned to common stockholders.

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