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Supplemental Cash Flow Information (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Jul. 03, 2021
Jun. 27, 2020
Condensed Cash Flow Statements, Captions [Line Items]        
Additional operating right-of-use assets $ 16,275 $ 116 $ 17,289 $ 193
Initial term of warehouse facility lease 10 years   10 years  
Operating lease, incremental borrowing rate 4.50%   4.50%