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INTANGIBLE ASSETS AND GOODWILL (Narrative) (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Jan. 01, 2017 USD ($) | Jan. 03, 2016 USD ($)
Disclosure of detailed information about intangible assets [line items] |  |  |
Impairment identified | $ 0 |  |
Intangible assets | $ 401,605,000 | $ 354,221,000 | $ 354,221,000
Percentage by which unit's recoverable amount exceed its carrying amount | 10.00% |  |
Key assumption used in estimation of unit's recoverable amount, EBITDA multiple | 11 |  |
Percentage by which value assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount | 10.00% |  |
Adjusted EBITDA multiple factor assigned to key assumption must change in order for unit's recoverable amount to be equal to carrying amount | 1 |  |
Computer software |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | $ 17,060,000 |  | $ 19,248,000
Computer software | Internally-generated |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 11,700,000 | 13,900,000 |
Computer software, assets not yet utilized in operations |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | $ 5,100,000 | $ 9,900,000 |

X
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