Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 777	$ (8,912)	$ 4,124	$ 16,683
Currency translation adjustment	407	243	101	(839)
Comprehensive earnings (loss)	1,184	(8,669)	4,225	15,844
Comprehensive earnings (loss) attributable to non-controlling interests	(240)	137	(251)	91
Comprehensive earnings (loss) attributable to SunOpta Inc.	$ 1,424	$ (8,806)	$ 4,476	$ 15,753