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RELATED PARTY TRANSACTIONS (Details) - Key management personnel - USD ($) | 12 Months Ended
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Dec. 29, 2019 | Dec. 30, 2018
Disclosure of transactions between related parties [line items] |  |
Expenses for airplane usage, related party transactions | $ 1.4 | $ 1.2
Amount in account payable, related party transactions | 0.7 | 0.3
DSUs |  |
Disclosure of transactions between related parties [line items] |  |
Amount in account payable, related party transactions | $ 6,939,000 | $ 8,310,000

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