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FINANCIAL INSTRUMENTS (Additional Information) (Details)
pound in Millions
 12 Months Ended
Dec. 30, 2018
USD ($)
shares
pound
Mar. 31, 2018
USD ($)
Disclosure of detailed information about hedged items [line items]    
Net gains in AOCI expected to be reclassified to inventory or net earnings within the next twelve months $ 1,400,000  
Total Return Swap    
Disclosure of detailed information about hedged items [line items]    
Term of TRS 1 year  
Notional amount (in shares) | shares 259,897  
Cash flow hedges    
Disclosure of detailed information about hedged items [line items]    
Ineffectiveness recognized in net earnings $ 0  
Term loan, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 2%    
Disclosure of detailed information about hedged items [line items]    
Maximum borrowing capacity   $ 300,000,000
Commodity risk | Financial assets included in prepaid expenses, deposits and other current assets    
Disclosure of detailed information about hedged items [line items]    
Notional amount (in shares) | pound 81.2  
Financial assets $ 300,000  
Commodity risk | Accounts payable and accrued liabilities (1)    
Disclosure of detailed information about hedged items [line items]    
Financial assets $ 1,000,000