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Earnings per share (Table) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Earnings Per Share Abstract |  |  |
Income (Loss) from Continuing Operations Attributable to Parent | $ (135,320) | $ (50,618) | $ (2,996)
dividends and accretion on Series A Preferred Stock | (7,809) | (1,812) | 0
Earning (loss) from continuing operations available to common shareholders | (143,129) | (52,430) | (2,996)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to SunOpta Inc | 0 | (570) | (19,475)
Earnings (loss) available to common shareholders | $ (143,129) | $ (53,000) | $ (22,471)
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Weighted Average Number of Shares Outstanding, Basic | 86,355,000 | 85,569,000 | 72,408,000
Dilutive Securities, Effect on Basic Earnings Per Share, Including Options and Restrictive Stock Units | 0 | 0 | 0
Weighted Average Number of Shares Outstanding, Diluted | 86,355,000 | 85,569,000 | 72,408,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 2,540,189 | 2,321,448 | 856,492
Earnings (loss) per share - basic |  |  |
from continuing operations basic | $ (1.66) | $ (0.61) | $ (0.04)
from discontinued operations basic | 0 | (0.01) | (0.27)
Earnings Per Share Total | (1.66) | (0.62) | (0.31)
Earnings (loss) per share - diluted |  |  |
from continuing operations diluted | (1.66) | (0.61) | (0.04)
from discontinued operations diluted | 0 | (0.01) | (0.27)
Earnings Per Share Diluted Total | $ (1.66) | $ (0.62) | $ (0.31)
Options Held [Member] |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Dilutive Securities, Effect on Basic Earnings Per Share, Including Options and Restrictive Stock Units | 0 | 0 | 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 815,952 | 66,166 | 54,316
Warrant [Member] |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Dilutive Securities, Effect on Basic Earnings Per Share, Including Options and Restrictive Stock Units | 0 | 0 | 0
Series A Preferred Stock [Member] |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Dilutive Securities, Effect on Basic Earnings Per Share, Including Options and Restrictive Stock Units | 0 |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 11,333,333 | 2,670,320 |

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