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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | Basic and diluted loss per share were calculated as follows (shares in thousands):
|  |  |  | Quarter ended
|  |  |  | March 31, 2018 | April 1, 2017
Numerator for basic loss per share: |  |  |  |
| Loss attributable to SunOpta Inc. | $ | (4,363) | $ | (11,398)
| Less: dividends and accretion on Series A Preferred Stock |  | (1,967) |  | (1,940)
| Loss attributable to common shareholders | $ | (6,330) | $ | (13,338)
Denominator for basic loss per share: |  |  |  |
| Basic weighted-average number of shares outstanding |  | 86,810 |  | 85,929
Basic loss per share | $ | (0.07) | $ | (0.16)
Numerator for diluted loss per share: |  |  |  |
| Loss attributable to SunOpta Inc. | $ | (4,363) | $ | (11,398)
| Less: dividends and accretion on Series A Preferred Stock(1) |  | (1,967) |  | (1,940)
| Loss attributable to common shareholders | $ | (6,330) | $ | (13,338)
Denominator for diluted loss per share: |  |  |  |
| Basic weighted-average number of shares outstanding |  | 86,810 |  | 85,929
| Dilutive effect of the following: |  |  |  |
|  | Series A Preferred Stock(1) |  | - |  | -
|  | Stock options and restricted stock units(2) |  | - |  | -
| Diluted weighted-average number of shares outstanding |  | 86,810 |  | 85,929
Diluted loss per share | $ | (0.07) | $ | (0.16)
(1) For the quarters ended March 31, 2018, it was more dilutive to assume the Preferred Stock was not converted into Common Shares and, therefore, the numerator of the diluted loss per share calculation was not adjusted to add back the dividends and accretion on the Preferred Stock and the denominator was not adjusted to include 11,333,333 Common Shares issuable on an if-converted basis. (2) For the quarters ended March 31, 2018 and April 1, 2017, stock options and restricted stock units to purchase or receive 657,946 and 84,659 Common Shares, respectively, were excluded from the calculation of diluted loss per share due to their anti-dilutive effect of reducing the loss per share. In addition, for the quarters ended March 31, 2018 and April 1, 2017, options to purch ase 1,984,184 and 1,362,347 Common Shares, respectively, were anti-dilutive because the exercise prices of these options were greater than the average market pric e.

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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://www.xbrl.org/2003/role/presentationRef -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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