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INTANGIBLE ASSETS AND GOODWILL (Narrative) (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2017 USD ($)
Disclosure of detailed information about intangible assets [line items] |  |  |
Impairment identified | $ 0 |  |
Intangible assets | $ 393,573,000 | $ 401,605,000 | $ 401,605,000
Key assumption used in estimation of unit's recoverable amount, EBITDA multiple | 11 |  |
Computer software |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | $ 21,790,000 |  | $ 17,060,000
Computer software | Internally-generated |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 0 | 0 |
Computer software, assets not yet utilized in operations |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | $ 5,900,000 | $ 5,100,000 |

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