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Segmented Information (Revenues from External Customers) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 02, 2021	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Segment Reporting Information [Line Items]
Revenues	$ 205,556	$ 191,659	$ 184,401	$ 207,597	$ 186,120	$ 182,585	$ 172,112	$ 180,779	$ 789,213	$ 721,596	$ 783,972
U.S. [Member]
Segment Reporting Information [Line Items]
Revenues									752,000	691,838	749,528
Canada [Member]
Segment Reporting Information [Line Items]
Revenues									12,481	9,418	14,712
Other [Member]
Segment Reporting Information [Line Items]
Revenues									$ 24,732	$ 20,340	$ 19,732

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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