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TRADE ACCOUNTS RECEIVABLE (Tables)
 12 Months Ended
Dec. 30, 2018
Subclassifications of assets, liabilities and equities [abstract]  
Schedule of trade accounts receivable
TRADE ACCOUNTS RECEIVABLE:
 
December 30, 2018

 
December 31, 2017

 
 
 
 
 
Trade accounts receivable
$
324,706

 
$
248,419

Allowance for expected credit losses
(7,547
)
 
(5,054
)
 
$
317,159

 
$
243,365

The movement in the allowance for expected credit losses in respect of trade receivables was as follows:
 
December 30, 2018

 
December 31, 2017

 
 
 
 
 
 
Balance, beginning of fiscal year
$
(5,054
)
 
$
(5,589
)
Adjustment relating to adoption of new accounting standard (note 2(d))
(791
)
 
—

Adjusted balance, beginning of fiscal year
(5,845
)
 
(5,589
)
Bad debt expense
(3,634
)
 
(3,689
)
Write-off of trade accounts receivable
1,932

 
4,224

Balance, end of fiscal year
$
(7,547
)
 
$
(5,054
)