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Intangible assets (Major Components) (Details) - USD ($) $ in Thousands | Dec. 28, 2019 | Dec. 29, 2018
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 212,076 | $ 212,764
Accumulated amortization | 62,067 | 51,789
Net book value | 150,009 | 160,975
Customer relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 210,157 | 210,845
Accumulated amortization | 60,173 | 49,937
Net book value | 149,984 | 160,908
Other Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 1,919 | 1,919
Accumulated amortization | 1,894 | 1,852
Net book value | $ 25 | $ 67

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