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Intangible assets | 12 Months Ended
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Dec. 29, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
IntangibleAssetsDisclosureTextBlock | 10. Intangible Assets The major components of intangible assets as at December 29, 2018 and December 30, 2017 were as follows:
|  |  |  | December 29, 2018
|  |  |  | Cost | Accumulated amortization | Net book value
|  |  |  | $ | $ | $
Customer relationships | 210,845 | 49,937 | 160,908
Patents, trademarks and other | 1,919 | 1,852 | 67
|  |  |  | 212,764 | 51,789 | 160,975
|  |  |  | December 30, 2017
|  |  |  | Cost | Accumulated amortization | Net book value
|  |  |  | $ | $ | $
Customer relationships | 211,176 | 39,274 | 171,902
Patents, trademarks and other | 1,919 | 1,762 | 157
|  |  |  | 213,095 | 41,036 | 172,059
The following is a summary of changes in intangible assets:
|  |  |  |  | Customer | Patents, trademarks |
|  |  |  |  | relationships | and other | Total
|  |  |  |  | $ | $ | $
Balance at December 31, 2016 |  | 183,258 | 266 | 183,524
| Amortization |  | (11,086) | (109) | (11,195)
| Impairment |  | (456) | - | (456)
| Foreign exchange |  | 186 | - | 186
Balance at December 30, 2017 |  | 171,902 | 157 | 172,059
| Amortization |  | (10,948) | (90) | (11,038)
| Foreign exchange |  | (46) | - | (46)
Balance at December 29, 2018 |  | 160,908 | 67 | 160,975
The Company estimates that the aggregate future amortization expense associated with finite-life intangible assets in each of the next five fiscal years and thereafter will be as follows:
|  |  |  | 2019 | 2020 | 2021 | 2022 | 2023 | Thereafter | Total
|  |  |  | $ | $ | $ | $ | $ | $ | $
Amortization expense | 11,013 | 10,382 | 10,112 | 10,112 | 10,112 | 109,244 | 160,975

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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