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Loss Per Share (Tables) | 12 Months Ended
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Dec. 28, 2019
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  |  |  | December 28, 2019 |  | December 29, 2018 |  | December 30, 2017 |
Basic Loss Per Share |  |  |  |  |  |  |  |  |
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 | )
Diluted Loss Per Share |  |  |  |  |  |  |  |  |
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(1) |  | (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: |  |  |  |  |  |  |  |  |
|  | Series A Preferred Stock(1) |  | — |  |  | — |  |  | — |
|  | Stock options and restricted stock units(2) |  | — |  |  | — |  |  | — |
| Diluted weighted-average number of shares outstanding |  | 87,787 |  |  | 87,082 |  |  | 86,355 |
Diluted loss per share | $ | (0.10 | ) | $ | (1.34 | ) | $ | (1.66 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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