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SHARE-BASED COMPENSATION SHARE-BASED COMPENSATION (Stock options issued and outstanding and exercisable) (Details)
Dec. 30, 2018
USD ($)
shares
year
Dec. 30, 2018
CAD ($)
shares
year
Dec. 31, 2017
shares
Jan. 01, 2017
shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]        
Options issued and outstanding, number (in shares) 2,662,000 2,662,000    
Options exercisable, number (in shares) 915,628 915,628 599,562  
$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) | $   $ 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) | $   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) | $   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) | $   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) | $   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) | $   $ 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) 1,993,000 1,993,000 2,263,000 2,532,000
Options exercisable, number (in shares) 916,000 916,000    
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) 71,000 71,000    
Options issued and outstanding, remaining contractual life | year 1 1    
Options exercisable, number (in shares) 71,000 71,000    
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) 239,000 239,000    
Options issued and outstanding, remaining contractual life | year 2 2    
Options exercisable, number (in shares) 239,000 239,000    
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) 254,000 254,000    
Options issued and outstanding, remaining contractual life | year 3 3    
Options exercisable, number (in shares) 191,000 191,000    
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) 635,000 635,000    
Options issued and outstanding, remaining contractual life | year 5 5    
Options exercisable, number (in shares) 159,000 159,000    
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    
Options issued and outstanding, remaining contractual life | year 4 4    
Options exercisable, number (in shares) 256,000 256,000    
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 7 7    
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) 669,000 669,000 759,000 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) 669,000 669,000    
Options issued and outstanding, remaining contractual life | year 6 6    
Options exercisable, number (in shares) 0 0