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SHARE-BASED COMPENSATION SHARE-BASED COMPENSATION (Stock options issued and outstanding and exercisable) (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 29, 2019 shares $ / shares | Dec. 29, 2019 shares $ / shares | Dec. 30, 2018 shares | Dec. 31, 2017 shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Options issued and outstanding, number (in shares) | 2,219,000 | 2,219,000 |  |
Options exercisable, number (in shares) | 990,000 | 990,000 | 915,628 |
$24.22 |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Exercise price of outstanding share options | $ / shares |  | $ 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 | $ / shares |  | 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 | $ / shares |  | 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 | $ / shares |  | 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 | $ / shares |  | $ 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 | $ / shares | $ 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) | 1,550,000 | 1,550,000 | 1,993,000 | 2,263,000
Options exercisable, number (in shares) | 822,394 | 822,394 |  |
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) | 87,000 | 87,000 |  |
Weighted average remaining contractual life of outstanding share options | 1 year |  |  |
Options exercisable, number (in shares) | 87,000 | 87,000 |  |
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) | 126,000 | 126,000 |  |
Weighted average remaining contractual life of outstanding share options | 2 years |  |  |
Options exercisable, number (in shares) | 126,000 | 126,000 |  |
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) | 543,000 | 543,000 |  |
Weighted average remaining contractual life of outstanding share options | 4 years |  |  |
Options exercisable, number (in shares) | 226,000 | 226,000 |  |
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) | 511,000 | 511,000 |  |
Weighted average remaining contractual life of outstanding share options | 3 years |  |  |
Options exercisable, number (in shares) | 384,000 | 384,000 |  |
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 |  |
Weighted average remaining contractual life of outstanding share options | 6 years |  |  |
Options exercisable, number (in shares) | 0 | 0 |  |
CAD | US Total |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Options exercisable, number (in shares) | 823,000 | 823,000 |  |
USD |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |
Options issued and outstanding, number (in shares) |  |  | 669,000 | 759,000
Options exercisable, number (in shares) | 167,224 | 167,224 | 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) | 669,000 | 669,000 |  |
Weighted average remaining contractual life of outstanding share options | 5 years |  |  |
Options exercisable, number (in shares) | 167,000 | 167,000 |  |

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