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Discontinued Operations (Opta Minerals Operating Results) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Earning (loss) before income tax | $ 0 | $ (1,993) |  | $ (17,377)
Gain (loss) on classification as held for sale | 0 | 560 |  | (10,515)
Recovery of (provision for) income taxes during phase out | 0 | 599 |  | (402)
Earnings (loss) from discontinued operations, net of taxes |  | (834) |  | (28,294)
Loss from discontinued operations attributable to non-controlling interests | 0 | 264 |  | 8,819
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to SunOpta Inc | $ 0 | (570) |  | (19,475)
Opta Minerals Inc [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenues from discontinued operations |  | 24,896 |  | 113,805
Costs of Goods Sold |  | (22,133) |  | (99,256)
Selling, general and administrative expenses |  | (3,024) |  | (11,170)
Intangible Asset Amortization |  | 0 |  | (1,987)
Other Expense, net |  | (794) | [1] | (15,097)
Foreign exchange gain (loss) |  | (454) |  | 717
Interest Expense |  | (484) |  | (4,389)
Earning (loss) before income tax |  | (1,993) |  | (17,377)
Gain (loss) on classification as held for sale |  | 560 |  | (10,515)
Pre-tax gain on sale - earnings |  | (1,433) |  | (27,892)
Recovery of (provision for) income taxes during phase out |  | 599 |  | (402)
Earnings (loss) from discontinued operations, net of taxes |  | (834) |  | (28,294)
Loss from discontinued operations attributable to non-controlling interests |  | 264 |  | 8,819
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to SunOpta Inc |  | $ (570) |  | $ (19,475)
[1] | (1) For the years ended December 31, 2016 and January 2, 2016, other expense, net includes charges related to the impairment of long-lived assets of Opta Minerals of $0.4 million and $12.4 million, respectively.

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