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BASIS OF PREPARATION BASIS OF PREPARATION (Narrative) (Details) - USD ($)
Jan. 03, 2021
Dec. 29, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 30, 2018
Disclosure of initial application of standards or interpretations [line items]          
Lease liabilities $ 82,464,000 $ 81,500,000      
Right-of-use assets 59,445,000 $ 73,539,000     $ 0
Impact of initial application of new IFRS on retained earnings     $ 2,176,000    
IFRS 16          
Disclosure of initial application of standards or interpretations [line items]          
Deferred lease credits related to lease inducements       $ 1,900,000  
Prepaid rent transferred to right-of-use asset       1,200,000  
Decrease in Right-of-use assets       1,200,000  
Non-current onerous contracts provision       4,600,000  
Lease liabilities       87,900,000  
Right-of-use assets       78,119,000  
Net investment in sublease       2,400,000  
Impact of initial application of new IFRS on retained earnings       $ (2,200,000)  
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16       3.89%  
Interest rate risk          
Disclosure of initial application of standards or interpretations [line items]          
Notional amount 800,000,000        
Interest rate risk | Cash flow hedges          
Disclosure of initial application of standards or interpretations [line items]          
Notional amount $ 275,000,000