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SHARE-BASED COMPENSATION SHARE-BASED COMPENSATION (Stock options issued and outstanding and exercisable) (Details) | Dec. 31, 2017 USD ($) shares year | Dec. 31, 2017 CAD shares year | Jan. 01, 2017 shares | Jan. 03, 2016 shares
--- | --- | --- | --- | ---
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Options issued and outstanding, number (in shares) | 3,022,000 | 3,022,000 |  |
Options exercisable, number (in shares) | 599,562 | 599,562 | 468,813 |
$13.60 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Exercise price of outstanding share options (in CAD and USD per share) | CAD |  | CAD 13.60 |  |
$15.59 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Exercise price of outstanding share options (in CAD and USD per share) | CAD |  | 15.59 |  |
$24.22 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Exercise price of outstanding share options (in CAD and USD per share) | CAD |  | 24.22 |  |
$30.46 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Exercise price of outstanding share options (in CAD and USD per share) | CAD |  | 30.46 |  |
$33.01 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Exercise price of outstanding share options (in CAD and USD per share) | CAD |  | 33.01 |  |
$38.01 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Exercise price of outstanding share options (in CAD and USD per share) | CAD |  | 38.01 |  |
$42.27 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Exercise price of outstanding share options (in CAD and USD per share) | CAD |  | CAD 42.27 |  |
$29.01 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Exercise price of outstanding share options (in CAD and USD per share) | $ | $ 29.01 |  |  |
CAD |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Options issued and outstanding, number (in shares) | 2,263,000 | 2,263,000 | 2,532,000 | 1,895,000
Options exercisable, number (in shares) | 600,000 | 600,000 |  |
CAD | $13.60 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Options issued and outstanding, number (in shares) | 63,000 | 63,000 |  |
Options issued and outstanding, remaining contractual life | year | 1 | 1 |  |
Options exercisable, number (in shares) | 63,000 | 63,000 |  |
CAD | $15.59 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Options issued and outstanding, number (in shares) | 81,000 | 81,000 |  |
Options issued and outstanding, remaining contractual life | year | 2 | 2 |  |
Options exercisable, number (in shares) | 81,000 | 81,000 |  |
CAD | $24.22 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Options issued and outstanding, number (in shares) | 261,000 | 261,000 |  |
Options issued and outstanding, remaining contractual life | year | 3 | 3 |  |
Options exercisable, number (in shares) | 174,000 | 174,000 |  |
CAD | $30.46 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Options issued and outstanding, number (in shares) | 286,000 | 286,000 |  |
Options issued and outstanding, remaining contractual life | year | 4 | 4 |  |
Options exercisable, number (in shares) | 138,000 | 138,000 |  |
CAD | $33.01 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Options issued and outstanding, number (in shares) | 714,000 | 714,000 |  |
Options issued and outstanding, remaining contractual life | year | 6 | 6 |  |
Options exercisable, number (in shares) | 0 | 0 |  |
CAD | $38.01 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Options issued and outstanding, number (in shares) | 575,000 | 575,000 |  |
Options issued and outstanding, remaining contractual life | year | 5 | 5 |  |
Options exercisable, number (in shares) | 144,000 | 144,000 |  |
CAD | $42.27 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Options issued and outstanding, number (in shares) | 283,000 | 283,000 |  |
Options issued and outstanding, remaining contractual life | year | 8 | 8 |  |
Options exercisable, number (in shares) | 0 | 0 |  |
USD |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Options issued and outstanding, number (in shares) | 759,000 | 759,000 | 0 |
USD | $29.01 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Options issued and outstanding, number (in shares) | 759,000 | 759,000 |  |
Options issued and outstanding, remaining contractual life | year | 7 | 7 |  |
Options exercisable, number (in shares) | 0 | 0 |  |

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