Financial Instruments - Schedule of Line of Credit Facilities (Details) $ in Millions, $ in Millions	Sep. 26, 2021 CAD ($)	Sep. 26, 2021 USD ($)	Dec. 27, 2020 USD ($)
Line of Credit Facility [Line Items]
Production financing loan and other loans		$ 204.7	$ 170.9
CANADA
Line of Credit Facility [Line Items]
Production financing loan and other loans	$ 37.0
U.S.
Line of Credit Facility [Line Items]
Production financing loan and other loans		167.7
U.S. Dollars and Canadian Dollars
Line of Credit Facility [Line Items]
Production financing loan and other loans		$ 204.7