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Discontinued Operations (Operating results) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain on classification as held for sale | $ 0 | $ 0 | $ 0 | $ 560
Recovery of income taxes during phase out | 0 | 0 | 0 | 599
Earnings (loss) from discontinued operations, net of taxes |  |  |  | (834)
Loss from discontinued operations attributable to non-controlling interests | 0 | 0 | 0 | 264
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to SunOpta Inc | 0 | $ 0 | $ 0 | (570)
Opta Minerals Inc [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenues from discontinued operations | 0 |  |  | 24,896
Costs of Goods Sold | 0 |  |  | (22,133)
Selling, general and administrative expenses | 0 |  |  | (3,024)
Other Income (Expense), net | 0 |  |  | (794)
Foreign exchange gain (loss) | 0 |  |  | (454)
Interest Expense | 0 |  |  | (484)
Earning (loss) before income tax | 0 |  |  | (1,993)
Gain on classification as held for sale | 0 |  |  | 560
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax | 0 |  |  | (1,433)
Recovery of income taxes during phase out | 0 |  |  | 599
Earnings (loss) from discontinued operations, net of taxes |  |  |  | (834)
Loss from discontinued operations attributable to non-controlling interests | 0 |  |  | 264
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to SunOpta Inc | $ 0 |  |  | $ (570)

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